183results about How to "Solve difficult to recycle" patented technology

The invention relates to a method for extracting vanadium from vanadium-containing steel slag by using a highly-alkaline sodium hydroxide medium, belonging to the technical field of metallurgy. The technical scheme comprises the following steps: adding steel slag, water and NaOH into a reactor together, wherein the mass concentration of the NaOH solution is 65-90%; decomposing and leaching under atmospheric pressure, and diluting the obtained slurry with a diluter to obtain a slurry mixture; and separating the slurry mixture by filtering at constant temperature, and washing the slag with a washing solution to obtain tailings and a vanadium-containing water solution. The method provided by the invention can be implemented under atmospheric pressure at low temperature (greatly lower than the roasting temperature in the traditional pyrogenic process), and is easy to operate and safe; and the extraction rate of vanadium is greatly higher than that of the existing vanadium recovery technique based on the pyrogenic process and wet process, the one-time recovery rate of vanadium is 85-90%, and the total content of vanadium in the tailings is 0.3-0.6 wt%. The invention solves the problem that vanadium in the vanadium-containing steel slag can not be easily recovered, and has the advantages of high recovery rate of vanadium, low production cost, favorable economic benefit and environmental benefit, and the like.

The invention discloses a four-drive cooking frying machine. The four-drive cooking frying machine comprises a cooking cavity, a heat exchanging cavity and a heat preservation box. The frying pan, a decocting pan, a steaming furnace box and a stewing furnace box are arranged in the cooking cavity; high-temperature flue gas generated through cooking in the cooking cavity is subjected to heat exchanging through the heat exchanging cavity to be discharged, a heat exchanging water pipe is arranged in the heat exchanging cavity, cold water enters the water feeding end of the heat exchanging water pipe, the hot water discharging end of the heat exchanging water pipe is connected with the heat preservation box, and the heat preservation box is used for supplying hot water. According to the four-drive cooking frying machine, the frying pan, the decocting pan, the steaming furnace box and the stewing furnace box are arranged in the cooking cavity, four dish types can be driven and cooked at the same time, the four furnaces are integrated, full-automatic working can be achieved, and labor is really saved. Meanwhile, the heat exchanging cavity and the heat preservation box are arranged, waste heat when cooking is carried out through the four furnaces is recycled, energy waste and heat pollution when cooking is carried out through an additional cooking range are avoided, the efficiency is achieved, and energy is saved. In addition, as oil contamination in oil smoke is completely condensed and filtered in the heat exchanging process, it is avoided that the environment is polluted through oil smoke. The invention further provides the frying pan.

The invention discloses a device for installing and recovering a micro-vibration sensor in an aquiferous weak rock-soil body deep hole. The device comprises a hot galvanizing pipe arranged in a pre-drilled hole, a base arranged at the bottom of the hot galvanizing pipe in a sealed mode, a plurality of detachably-connected operating rods, a sensor base connected with the sensor, an installation sleeve and a recovery sleeve, wherein both the installation sleeve and the recovery sleeve are detachably connected with the operating rods, the base is provided with a base outer stud, a sensor base convex body is arranged on the lateral of the sensor base, the installation sleeve and the recovery sleeve are respectively provided with a sleeve clamping groove, and the bottom of the sensor base is provided with sensor base lower internal threads matched with the base outer stud. Accordingly, the problems that the sensor is difficult to install, protect and recover in the aquiferous weak rock-soil body deep hole are solved.

Disclosed is a preparation method of formaldehyde-photodegrading honeycomb activated carbon. The method is characterized by including: putting powdered activated carbon in a home-made cellophane mould, adding a black material prior to mixing for a certain period of time, rapidly adding a white material, performing high-speed mixing prior to free foaming, carrying out room-temperature curing prior to forming, putting the formed material in a muffle furnace for high-temperature heat treatment prior to obtaining the honeycomb activated carbon, subjecting TiO2 nano particles of P-25 type to ultrasonic dispersion to form suspension liquid, completely immersing the prepared honeycomb activated carbon into the suspension liquid, and performing heat treatment to prepare a P-25 / activated carbon composite having good photocatalytic degradation performance on indoor formaldehyde. The operation process has the main advantages that that the operation method is simple, the prepared honeycomb activated carbon is large in specific surface area and high in adsorptive property, can be prepared into arbitrary shape, has good catalytic degradation performance on indoor formaldehyde gas and is reusable, low in production cost and applicable to removal of formaldehyde gas after home decoration, and after the honeycomb activated carbon is loaded with P-25, the P-25 nano particles are evenly dispersed in the surface and pores of the honeycomb activated carbon.

The invention relates to an X-shaped zeolite molecular sieve and a method for preparing thereof, relating to a field of zeolite molecular sieve material; The X-shaped zeolite molecular sieve is a magnetic iron-doped X-shaped zeolite molecular sieve; magnetic ferroferric oxide is formed in the zeolite lattice, wherein, quality percentage of Fe occupying the molecular sieve is 1.89 percent to 3.48 percent. The preparing method comprises the steps that, iron-doped X-shaped zeolite molecular sieve is firstly compounded and then the magnetized magnetic iron-doped X-shaped zeolite molecular sieve is prepared through hydrogen reduction; the method results in a structure of Fe3O4 formed in frame of the iron-doped X-shaped zeolite molecular sieve. The magnetic iron-doped X-shaped zeolite molecular sieve has strong magnetism and magnetic stability, which not only solves the problem that the existing powdery zeolite molecular sieve is difficult to be recycled in reaction solution, and further improves absorption property of the sieve, but also enlarge application range of the zeolite molecular sieve, thereby allowing the zeolite molecular sieve to be applied to catalytic reaction in which iron acts as the catalyst.

The invention discloses a tailing pond model test simulation system. The tailing pond model test simulation system comprises a water supply system, a terrain simulation system, a measuring system and a water and sand recovery system. The water supply system is communicated with the upstream of the terrain simulation system through a water conveying pipeline. The downstream of the terrain simulation system is communicated with the water and sand recovery system through a mortar channel. The water and sand recovery system is provided with a sand filter device and a water return port. The measuring system is used for measuring parameters of dam-break debris flow in the terrain simulation system. The terrain simulation system comprises a terrain simulation support. A rib mesh layer, a felt layer and a waterproof layer are installed at the top end of the terrain simulation support in sequence from bottom to top. The terrain simulation support comprises a plurality of adjustable supporting bases. The lower portions of every two adjacent adjustable supporting bases are connected through a cross beam. The rib mesh is installed at the top ends of the adjustable supporting bases. The tailing pond model test simulation system solves the problems that the terrain manufacturing process is complex and water and sand are difficult to recover during tests, the model test efficiency is improved, and the test system can be recycled.

The invention belongs to the field of pet supplies, and particularly relates to bentonite cat litter and a preparation method thereof. The bentonite cat litter is prepared from, by weight, 70-80 partsof bentonite powder, 35-45 parts of tourmaline powder, 35-45 parts of nanometer TiO2 powder, 30-45 parts of hydroxyapatite powder, 20-25 parts of bamboo charcoal powder, 10-15 parts of cinnamomum camphora leaves, 10-15 parts of flos buddlejae, 15-20 parts of rhizoma osmundae, 10-15 parts of downy ground cherry fruits or herbs, 8-12 parts of celastrus angulatus, 15-18 parts of herba polygoni avicularis, 20-25 parts of water and 2-3 parts of food colouring. The bentonite cat litter is high in water absorption effect, good in deodorization and sterilization effects, natural, free of pollution, capable of serving the organic fertilizer to be buried and high in utilization rate.

The invention discloses a novel black and red Chinese wolfberry fruit compound fermented beverage and a preparation method thereof and belongs to the processing field of microbial fermentation technologies of foods. The preparation method mainly comprises the steps of pretreatment of raw materials, juicing, ultrasonic assisted chitosan immobilized complex enzyme treatment, filtration, pasteurization, primary fermentation of a lactic acid bacterium composite leavening agent, secondary fermentation with active dry yeast and acetic acid bacteria, saccharic acid blending, centrifugation, pasteurization, filling and finished beverage. The preparation method is simple in process and low in processing cost, the prepared beverage has the flavor of Chinese wolfberry fruits and also has the smell produced through Chinese wolfberry fruit, a pleasant mellow aroma and soft sour, so that the beverage has more delicate taste, has no bad odor, homogeneous color and luster and good nutritional health-care functions; the total acid of the beverage is 2.83%, pH is 3.70, the aqueous protein of plants is 2.83g / L, the total phenol is 38.17mg / L, the carotenoid is 35.67ug / L, the alcoholic strength is 1% or below, and bacteria and escherichia coli are not detected out.

The invention protects a preparation method of magnetic Fe3O4 / CeO2 nano-complex and a method of treating a methylene blue solution by using the magnetic Fe3O4 / CeO2 nano-complex as a Fenton-like catalyst. The magnetic complex catalyst consists of a nano-ceria material which coats magnetic ferroferric oxide nanometer particles. The magnetic solid catalyst provided by the invention can be used as a heterogeneous catalyst to catalyze hydrogen peroxide to generate hydroxyl free radicals for degradation of methylene blue. By using the method provided by the invention, the degradation rate of methylene blue in 30 minutes reaches 90% or more.

A 4A zeolite molecular sieve with a certain magnetism and carrying Fe contained compound on its surface is a granular one containing Fe (3.55-9.70 mass%). Its preparing process includes such steps as synthesizing 4A zeolite molecular sieve, preparing Fe ion solution and aqueous solution of NH4, and magnetically modifying the 4A zeolite molecular sieve by chemical deposition method.

The invention discloses a magnetic graphene-supported nano zero-valent iron composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing graphene oxide by a modified Hummers method; mixing the above graphene oxide, ferric chloride and sodium acetate, and performing a hydrothermal reaction to obtain magnetic graphene; and fully mixing the above product and a ferrous salt solution, and under the protection of nitrogen, reducing the ferrous salt by sodium borohydride to obtain the magnetic graphene-supported nano zero-valent iron composite material. The preparation method provided by the invention is easy to operate and has low costs, and the prepared composite material has strong degradation ability, good stability and easy magnetic separation, and is an environmentally-friendly functional material; and the embodiments verify that the material has a good removal effect on refractory nitrocompounds.

The invention relates to a defluorination adsorbent which comprises anion exchange resin and an inorganic defluorination adsorbent, wherein the inorganic defluorination adsorbent is in a layered crystal structure, deposited in the ducts of the anion exchange resin, and formed by a hydroxide of lithium, a hydroxide of aluminum and a hydroxide of lanthanum. The invention further discloses a preparation method of the defluorination adsorbent. The preparation method comprises the following steps that lanthanum salt and aluminum slat are dissolved in water containing ethyl alcohol, and a mixed solution is obtained; the anion exchange resin is added to the mixed solution, reaction is performed at the temperature of 60-80 DEG C, and then a strong caustic water solution is added for soaking; the processed anion exchange resin is added to the water solution of lithium salt, crystallization is performed at the temperature of 50-90 DEG C, and the defluorination adsorbent is obtained. According to the defluorination adsorbent, the absorption quantity is large, the absorption speed is high, the defluorination efficiency is high, and the defluorination adsorbent can be reused; the preparation method of the defluorination adsorbent is mild in condition, simple in technology and suitable for industrialization batch production.

The invention relates to a method for recovering strontium slag. The method comprises the following main steps: (1) adding hydrochloric acid in the strontium slag under the condition of stirring until the pH value of a reaction system is stabilized between 1 and 2; (2) adding a calcium carbonate source substance in the reaction system obtained in the step (1) until the concentration of SO3<2-> isless than 2.0g / L; (3) regulating the pH value of the solution obtained in the step (2) to 6-7, carrying out solid-liquid separation, and washing a solid phase; and (4) decontaminating and treating mother liquor obtained in the step (3) so as to obtain a strontium chloride hexahydrate crystal product. By utilizing a double decomposition reaction of a calcium salt in a solution of strontium slag dissolved with hydrochloric acid; due to the different acid effects of sulfites of calcium and strontium under the condition of an acidic medium, the strontium salt product with relatively high value can be obtained through a replacement reaction, thereby solving the problem that strontium in strontium sulfite is difficult to recover, improving the recovery rate of the strontium salt and improving resource utilization rate.

The invention discloses a preparation method of a 3D printing photocatalysis device. The 3D printing photocatalysis device is prepared through the following method: preparing a pore-making wire and ahigh-light transmittance wire, printing the pore-making wire into a device frame, and printing upper and lower panels for the high-light transmittance wire, then filling a photocatalyst into the innerpart of the device, then encapsulating to obtain the 3D printing photocatalysis device. The pollutant molecule freely enters and exits through the porosity of the frame, the photocatalysis and the diffusion of a powder are prevented, the problem of difficulty in recycling is solved, the preparation method is simple, the cost is low, the device can be repeatedly used, and the photocatalysis effectis relatively good.

The invention discloses a catalyst for degrading chlorophenol pollutants and a preparation method and applications thereof, and belongs to the fields of environment function materials and catalysis. The catalyst is prepared by following steps: at first, reacting aminated reduced graphene oxide with 3,5-dibromo salicylaldehyde in an ethanol system to synthesize 3,5-dibromo salicylaldehyde Schiff base; and then reacting copper acetate monohydrate with 3,5-dibromo salicylaldehyde Schiff base in an ethanol system to synthesize a Schiff base-copper complex. The catalyst can activate chlorophenol pollutants in a potassium persulfate degradation water solution. The method of eliminating chlorophenol pollutants comprises following steps: (a) preparing a catalyst solution from the catalyst and deionized water, and preparing a potassium persulfate solution from potassium persulfate and deionized water; and (b) mixing the catalyst solution, the potassium persulfate solution, and a water solutioncontaining chlorophenol pollutants, adding the mixed solution into deionized water, and carrying out reactions under vibration in the absence of light. The preparation method is simple, the catalyst activates potassium sulfate under mild conditions, and the energy consumption and pollution are low.

The invention relates to a foamed nickel-loaded zinc titanate photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: taking foamed nickel as amatrix, uniformly coating zinc titanate template agent mixed suspension on a thin layer to form a zinc titanate / template agent composite carrier; soaking and dissolving out by the template agent, anddrying to form the foamed nickel-loaded zinc titanate (ZnTiO3) photocatalytic material. The preparation method specifically comprises the following steps: forming turbid liquid A from polytetrafluoroethylene (PTFE) and ethanol, and adding ZnTiO3 and the template agent into the turbid liquid A according to a certain ratio so as to form turbid liquid B; uniformly coating the turbid liquid B onto thefoamed nickel, drying and soaking into the template dissolved-out solution for dissolving out the template agent, and flushing with deionized water and drying; and finally obtaining the foamed nickel-loaded ZnTiO3 photocatalytic material. According to the method disclosed by the invention, preparation of the foamed nickel-loaded ZnTiO3 photocatalytic material is realized, the binding force between materials is firm, and the prepared product has high catalytic activity on organic matter degradation in an ultraviolet light range, and has obvious advantages of being long in service life, easy torecover, free in secondary pollution and the like; and the whole process is simple in operation, short in cycle, energy-saving and low in manufacturing cost. The invention relates to a photocatalyticmaterial for water treatment.

The invention discloses a fluorine removing agent. The fluorine removing agent is a hybrid material of anion exchange resin, metal lithium and metal aluminum, and the molar ratio of lithium to aluminum in the fluorine removing agent is 1:2. The invention also discloses a preparing method of the fluorine removing agent. According to the organic-inorganic hybrid material mode, LDH is loaded with resin, active components can be quite good fixed, the mechanical strength of the material is high, the fluorine removing agent is suitable for an application of industrial fixed bed fluorine removing, and the problem that the powdery LDH can not be industrialized is solved. The fluorine removing agent can be repeatedly used for multiple times, the problem that the fluorine removing agent is not easily recycled is solved, and the fluorine removing agent has the good absorption effect after being used for multiple times. The fluorine removing agent is simple in preparing process, mild in condition and suitable for industrial mass production.

The invention relates to a preparation method of a catalyst of the Suzuki reaction, in particular to a preparation method of a magnetic bidentate imide palladium ligand catalyst. The invention aims to solve the problem that the existing palladium ligand catalyst is difficult to recycle in the Suzuki reaction. The structural formula of the magnetic bidentate imide palladium ligand catalyst is shown in the specification. The method comprises the following steps: adding Fe3O4 in a silane coupling agent solution, heating and mixing, filtering, drying to obtain Fe3O4 of which surface contains epoxy bonds, then adding the obtained Fe3O4 in an ethanol solution of a bidentate imide ligand and an alkali, heating to react, filtering to obtain bidentate imide ligand-supported Fe3O4; and then adding palladium source in the suspension of the bidentate imide ligand-supported Fe3O4, heating to react, filtering, and drying to obtain the magnetic bidentate imide palladium ligand catalyst. The catalyst can be separated under an external magnetic field; after being used for 7 times, the activity of the catalyst is not obviously reduced; and the catalyst can be used as the catalyst of the Suzuki reaction.

The invention belongs to the preparation field of photocatalysts and in particular relates to a preparation method of phosphotungstic acid and carbon nitride composite photocatalyst. The preparation method comprises the following steps: (1) calcining tripolycyanamide, carrying out furnace cooling, and porphyrizing to obtain yellow solid carbon nitride powder; and (2) adding phosphotungstic acid into a mixed solution of water and ethyl alcohol, stirring, adding with carbon nitride obtained in the step (1), stirring continuously, carrying out centrifugal separation on sediments, washing and drying to obtain the target product-phosphotungstic acid and carbon nitride composite photocatalyst. The process is simple, the cost is low, the recovery operation is easy, the product purity is high, the photocatalytic effect of the target product is remarkable and the method is suitable for volume production.

The invention belongs to the technical field of chemical industry and relates to a device and a method for preparing acetoxime. The acetoxime is prepared from acetone, tertiary butanol, water, ammonia water and hydrogen peroxide by using an integrated TS-1 molecular sieve as a catalyst (an integrated titanium silicalite molecular sieve serves as a catalyst) and through liquid solid phase acetone ammoxidation. The device comprises a condenser, an integrated reactor and an external circulation pump. The integrated TS-1 catalyst (the integrated titanium silicalite molecular sieve serves as the catalyst) synthesized by using frustum-shaped cordierite as a carrier is loaded in the integrated reactor and is applied to preparation of the acetoxime. By adoption of the frustum-shaped cordierite carrier in the device, the wall flow phenomenon can be effectively avoided, so that activity of the catalyst and catalytic efficiency of the reactor are greatly improved. By the device and the method, the problem that the traditional powdered catalyst is difficult to recycle is solved. The device and the method have a wide market application prospect.

The invention discloses a preparation method of an iron oxide / cuprous oxide photocatalytic film. The preparation method comprises the following steps: (1) carrying out an electric etching activation pretreatment on FTO conductive glass for later use; (2) immersing the FTO obtained in the step (1) into an Fe<3+> precursor solution with a concentration of 0.05 to 0.6 M, carrying out a hydrothermal film forming reaction for 10 to 16 hours at a temperature of 100 to 160 DEG C, and then carrying out constant-temperature calcination for 2 to 5 hours at a temperature of 400 to 650 DEG C to obtain a Fe2O3 film; and (3) taking a precursor of a Cu <2+> solution as an electrolyte, taking the FTO on which array Fe2O3 grows in the step (2) as a cathode, carrying out constant-voltage electro-depositionin a range of -0.1 V to -1V for 6-600s, and carrying out electro-deposition on the Fe2O3 film to prepare the Fe2O3 / Cu2O photocatalytic film. The Fe2O3 / Cu2O photo-electro-catalytic film is simple in preparation process, which is high in repeatability and low in economic cost. Under the action of photo-electricity, the catalyst has a low over-potential of 240 mV at 10 mA.cm<-2>. Two photo-catalystswith different energy band structures are combined to form a synergistic effect, and the catalytic performance is greatly improved.

The invention discloses a preparation method of an iron ion croscarmellose in-situ growing Prussian-blue microsphere adsorbing material. The method comprises the following steps of (1) dissolving carboxymethylcellulose into ultrapure water, stirring to obtain a concentrated sol, and performing ultrasonic defoaming on the sol; (2) electrically injecting the ultrasonic defoamed sol into a receiving device containing iron ions by using an electric injector; during electric injecting procedure, dropwise adding a cross-linking agent into the receiving device; stirring, filtering to obtain gel microspheres loading iron ions; (3) washing the prepared gel microspheres; soaking the gel microspheres into a potassium ferrocyanide solution; stirring and filtering; drip washing the obtained gel microspheres; and drying to obtain the Prussian-blue microsphere adsorbing material. The preparation method of the Prussian-blue microsphere adsorbing material disclosed by the invention has the characteristics of simple synthetic process, less energy consumption, good mechanical stability, good selectivity, reusability and the like; therefore the preparation method can be widely used for processing cesium containing Saline Lake brine, mother liquor of salt production, mother liquor after extracting lithium, nuclear waste liquid and the like.

The invention discloses a preparation method and a using method of a graded hole TiO2 ceramic photocatalyst, and relates to a preparation method and a using method of a photocatalyst. Problems to be solved in the invention are that the TiO2 ceramic photocatalyst capable of removing organic pollutants in wastewater cannot be prepared within 4 hours-6 hours in the existing method, and time for degrading organic pollutants in the wastewater by using the existing TiO2 ceramic photocatalyst is long. The preparation method comprises the following steps of: roasting powder materials, deionized water, a foaming agent, a dispersing agent and a binding agent after mixing, ball-milling, injection-molding and drying to obtain the graded hole TiO2 ceramic photocatalyst. The using method comprises the following step of: adding the graded hole TiO2 ceramic photocatalyst in the wastewater to irradiate under ultraviolet light. The prepared graded hole TiO2 ceramic photocatalyst has characteristic of being short in time of degrading pollutants in the water. The graded hole TiO2 ceramic photocatalyst is used as the photocatalyst for removing the organic pollutants in the wastewater.

The invention discloses a method for degrading sulfamethoxazole in wastewater by activating persulfate with a magnetic two-dimensional Mxene / CuFeO2 catalyst, and belongs to the field of water treatment. The invention aims to solve the problems of low efficiency and difficult catalyst recovery of the existing persulfate catalytic activation technology, and a more efficient, economic and environment-friendly activation method is developed. The sulfamethoxazole antibiotic is selected as a typical refractory organic pollutant in the water body. According to the method, the magnetic Mxene / CuFeO2 catalyst is applied to activation of persulfate for the first time, and new pollutants such as antibiotics and the like can be selectively oxidized and degraded from the water body by utilizing singlet oxygen generated by activation. By using the method, the effect of removing the typical emerging pollutant-sulfamethoxazole is obvious, and the removal rate can reach 99% or above within 10 minutes. The method has the advantages of high activation efficiency, high efficiency and rapidness in pollutant removal, easiness in catalyst recovery and the like.

The invention relates to a wastewater treatment device based on a carbon nanotube / zinc oxide PTFE photocatalytic membrane and an application thereof. The wastewater treatment device comprises a water-in system, a photocatalysis system, a distillation system, a circulating water system and a water collection system, wherein the photocatalysis system comprises a quartz cold trap and a light source arranged in the quartz cold trap; the distillation system comprises a heater, a membrane distiller and a carbon nanotube / zinc oxide PTFE photocatalytic membrane; and the carbon nanotube / zinc oxide PTFE photocatalytic membrane is made into a shape with a cylindrical side surface, and the photocatalysis system is positioned on a center axis. A carbon nanotube / zinc oxide nano catalyst can degrade organic matters in pesticide wastewater under the effect of photocatalysis; and by adopting the PTFE membrane as a carrier, the pollution of the PTFE membrane can be reduced, and the problem that the nano photocatalytic material is hard to recycle in the treatment process is solved. By adopting the method provided by the invention, the removal rate of COD in the pesticide wastewater can exceed 95%, and high purification of the pesticide wastewater is realized; and the method has remarkably high practicability and broad market prospects.

The invention provides a method for preparing a wood / MOF (Metal Organic Framework) functional composite material, which comprises the following steps: adding a precursor solution for synthesizing an MOF material into wood, and carrying out hydrothermal reaction or a physical filling method to prepare the wood / MOF functional composite material. The nano MOF particles are grown in situ or filling wood pores with the nano MOF particles to obtain the wood / MOF functional composite material. The method is easy to operate and low in cost. The defects that powder nano MOF is not easy to recycle and poor in machinability and operability are overcome, and the wood / MOF functional composite material has wide application prospects in the fields of flame retardance, adsorption, catalysis and the like. According to the preparation method, the organic ligand, the metal salt solution and the wood are taken as main raw materials, the synthesized MOF uniformly grows on the wood through a one-step hydrothermal reaction or a physical filling method, the effective load of the MOF active component on the wood can be realized, and the prepared wood / MOF functional composite material has excellent performances of catalysis, flame retardance, adsorption and the like. The raw materials are wide in source, and the preparation method is simple.

The invention relates to a method for recovering platinum group metal from ferrous nickel electrolysis anolyte, which comprises the following steps of: firstly neutralizing the nickel electrolysis anolyte to remove iron; returning the filtrate to a production system; performing acid dissolution on the obtained primary iron slag at 20-50 DEG C, and then adding a vulcanizing agent; performing precision filtering, wherein over 96% of precious metal is enriched in the filter residue; and removing iron of the filtrate by a sodium jarosite method, wherein the content of precious metal in the obtained sodium jarosite slag is less than 1.0g / t. The method provided by the invention solves the problem that precious metal is lost in anolyte and hard to recover in an electrolytic refining process of a nickel anode containing precious metal, prevents influence on the existing production, and can guarantee the quality of electrolytic nickel; and moreover, the technology is simple, the production cost is low, and the implementation is easy.

The invention belongs to the technical field of preparation of composite photocatalytic materials, and particularly relates to a carbon nitride quantum dot / oxide nano fiber composite photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: preparing a precursor solution from a polymer, a solvent and a metal salt, carrying out electrostatic spinning and calcining on the precursor solution to obtain oxide nano fibers, preparing carbon nitride nano sheets, respectively placing the oxide nano fibers and the carbon nitride nano sheets at the outlet end and the inlet end of a tubular furnace, and carrying out heat treatment on the inlet end under an inert atmosphere conveying condition to obtain the composite photocatalytic material. The preparation and compounding of the carbon nitride quantum dots are realized in one step by adopting a thermal stripping in-situ deposition method, compared with an existing hydrothermal method and mechanical mixing method, the compounding uniformity and compounding efficiency are obviously improved, the prepared composite material is stable in structure, the problem that the quantum dots are not easyto compound is solved, and the method is simple and easy to implement and low in cost.

The invention discloses a method and device for scarifying soil and picking up plastic film residues sequentially in a tobacco field. According to the method of the invention, a scarifying soil device is pulled through the power of a tractor, so that soil of which the depth ranges from 10 to 15cm in the tobacco field can be scarified through using the scarifying soil device, and the plastic film residues in the soil can be dug out and located at the surface of the field, and can be picked up through a film pickup mechanism; and picked up plastic film residues are transferred to a specified site so as to be cleared, and the pickup and recycling of the plastic film residues can be realized. According to the method and device of the invention, the scarifying soil device is utilized to chop the soil and dig out the deeply buried residues, and therefore, the tobacco field can be scarified, and at the same time, the plastic films can be fully dug out and are located at the surface of the field, and therefore, the technical problem that plastic films buried deeply and plastic film residues on ground cannot be recycled simultaneously can be solved, and the problem of low possibility of recycling plastic film residues attached to the surface of caked soil in mountain areas can be solved. The method of the invention is reliable. The device has the advantages of simple structure, low cost and excellent use effect.

The invention discloses a method for preparing maleic acid isopropyl ester. The method comprises the following steps of: (1) preparing sulfonacid ionic liquid onium salt through sultone and nitrogen tertiary amine compounds; (2) dissolving the sulfonacid ionic liquid onium salt into water, slowly dropwise adding acid under ice bath so as to prepare a sulfonacid ionic liquid; and (3) carrying out condensation and reflux reaction on maleic anhydride, isopropanol, the sulfonacid ionic liquid and a water-carrying agent, separating a liquid, circularly catalyzing the sulfonacid ionic liquid at the lower layer, carrying out decompression distillation on an ester layer at the upper layer, then neutralizing with alkali, layering, and carrying out decompression distillation to obtain finished maleic acid isopropyl ester. The sulfonacid ionic liquid catalyst can be recycled and can absorb water, thus being beneficial to forwarding operation of the reaction, and realizing the recovery and recycling of excessive alcohol. The method is simple in procedures, pollution-free and non-corrosion, and has the advantages of being mild in conditions, environment-friendly and economic in benefits.