675 results about "Ferrous sulfate heptahydrate" patented technology

The invention provides nano zero-valent iron with montmorillonite serving as a carrier, and a preparation method and application thereof. The method comprises the steps of dissolving ferrous sulfate, adding soluble starch and montmorillonite particles into the ferrous sulfate solution in proportion, and obtaining mixed liquid; stirring after performing ultrasound treatment to the obtained mixed liquid, and obtaining precursor solution; adding the obtained precursor solution into sodium borohydride or potassium borohydride solution in proportion under the conditions of continuous stirring, continuing stirring for a period of time, performing solid-liquid separation, and obtaining the solid which is the nano zero-valent iron with montmorillonite serving as the carrier. According to the prepared nano zero-valent iron with montmorillonite serving as the carrier, interlayer and surface spaces of montmorillonite can be fully utilized, the activity and the stability are high, polymerization of the nano zero-valent iron can be reduced, and the nano zero-valent iron has remarkable effect when used for treating waste water containing hexavalent chromium.

The invention relates to a method for treating organic amine industrial waste water by Fenton-like oxidation-flocculation. According to the method, the pH value of the waste water is adjusted to 3-5, and the temperature of the waste water is adjusted to 20-40 DEG C; a catalyst is added, wherein active ingredients of the catalyst comprise: ferrous sulfate, anhydrous cupric sulphate and manganese sulfate monohydrate, wherein the mass ratio of the ferrous sulfate to the anhydrous cupric sulphate to the manganese sulfate monohydrate is (5-10):1:(0-5); H2O2 (30%) is added, and the oxidation reaction time is 4 hours; after completing the oxidation reaction, sodium hydroxide is added to adjust the pH value of the waste water to 8-10; adding a chemical coagulant and an organic polymer flocculant, such that partial suspended solids, colloids and partial organic amines in the waste water are concurrently coagulated. According to the present invention, the Fenton-like oxidation-flocculation is adopted as the pretreatment for the organic amine waste water, such that the organic amines in the waste water can be effectively removed, the poison and the impact on microorganisms due to the high concentration organic amines in the wastewater can be reduced, the subsequent biological treatment is easily performed for the sewage.

The invention discloses a method for purifying a ferrous sulfate heptahydrate byproduct in titanium white production, which comprises the following steps of: (1) adding a solvent into the byproduct in titanium white production, heating to the temperature of between 65 and 105 DEG C, and stirring for dissolution to prepare saturated solution; (2) adding iron powder at the temperature of between 95 and 105 DEG C; (3) adding phosphoric acid and heating at the temperature of between 95 and 105 DEG C for 10 to 20 minutes; (4) cooling the mixture to the temperature of between 80 and 90 DEG C, adding sulfide, stirring for 30 to 60 minutes, and adding sulphuric acid; (5) adding polyacrylamide, stirring for 3 to 10 minutes, precipitating, and filtering to obtain ferrous sulfate solution; and (6) cooling and crystallizing the ferrous sulfate solution, filtering and separating to prepare ferrous sulfate crystals. The content of the ferrous sulfate heptahydrate prepared is over 20.1 percent, and the content of titanium, lead, cadmium, chromium and magnesium is less than 10ppm based on the lead. The process is simple and the process flow is short.

The invention discloses a method for preparing polystyrene / conductive polymer composite hollow microspheres, which comprises the following steps of: adding aniline or pyrrole and acid or mixture thereof into polystyrene emulsion under the protection of inert gas, stirring the obtained mixture for at least 10 minutes, and then adding an initiator into the mixture to perform polymerization, whereinthe molar ratio of the aniline or the pyrrole to the acid is 0.2 to 0.8, the weight ratio of the aniline or the pyrrole to the polystyrene is 0.1 to 1.0, and the initiator is ammonium persulfate, potassium persulfate, iron trichloride or ferrous sulfate heptahydrate / hydrogen peroxide. Different from the traditional method for preparing the hollow polymer microspheres, the method does not need high-temperature calcination or solvent denucleation treatment and can prepare the polymer composite hollow microspheres by one step, and the microspheres have good appearance and monodispersity. The method is simple, has a few operation steps, and is easy for subsequent treatment; and because the used solvent is a green solvent, the method is safe and reliable, and has low cost.

The invention relates to nutrient solution for improving transplanting survival rate of nursery stocks and a preparation method thereof. The method comprises the following steps of: adding ammonium nitrate, potassium nitrate and potassium dihydrogen phosphate into water to prepare solution A; adding calcium chloride into water to prepare solution B; adding magnesium sulfate into water to prepare solution C; weighing ferrous sulfate heptahydrate and ethylene diamine tetraacetic acid, adding boiled water, fixing the volume to 1,000ml, and taking 10 to 15ml / l of solution, namely solution D; dissolving zinc sulfate, manganese sulfate, copper sulfate, boracic acid and sodium molybdate into the boiled water to prepare solution E; weighing indolebutyric acid, and fully dissolving the indolebutyric acid by using a little amount of alcohol to obtain solution F; weighing naphthylacetic acid, and dissolving the naphthylacetic acid by using a little amount of alcohol to obtain solution G; and pouring the prepared solution B into the solution A, sequentially pouring the solution C, the solution D, the solution E, the solution F and the solution G into the solution A, adding water, regulating the pH, and stirring the solution to obtain the nutrient solution. The nutrient solution effectively shortens the seedling delaying period, realizes quick seedling delay and robustness of the nursery stocks, improves the survival rate, the quality and the transplanting survival rate of the nursery stocks, and fulfills the purposes of saving the production and reducing the cost.

The invention discloses a preparation method of a synthetic type polycarboxylic acid water reducer. The synthetic type polycarboxylic acid water reducer has a solid content of 40-50%, and is prepared from the following raw materials in parts by weight: 100 parts of unsaturated polyoxyethylene ether, 7-15 parts of unsaturated acid, 4-10 parts of unsaturated ester, 1-3 parts of an amide derivative, 0.5-2 parts of an oxidant, 0.2-1.2 parts of a chain transfer agent, 0.3-2 parts of a reducing agent, 0.1-1 part of a crosslinking agent, 0.01-0.1 part of ferrous sulfate heptahydrate, 5-10 parts of a commercially available mud-resistant auxiliary agent, 90-130 parts of deionized water and an appropriate amount of liquid caustic soda. The preparation method disclosed by the invention adopts a normal-temperature oxidation-reduction initiating system to synthesize the synthetic type polycarboxylic acid water reducer which not only has functions of water reduction and slump loss resistance, but also has functions of mud resistance and early strength, heating is not needed for reaction, the energy consumption is reduced, and the production cost is greatly reduced.

The invention provides an agent special for bioleaching municipal sludge, which belongs to the technical field of engineering technology. The agent for bioleaching the municipal sludge contains a carbon source and nutrient substances, which are needed by the growth of thiobacillus and acid-resistant heterotrophic bacteria, including ammonium sulfate, potassium chloride, dipotassium phosphate, calcium nitrate, magnesium sulfate, vitamins, trace elements, carbon source substances, sodium thiosulfate, sulphur powder, finished pyrite or ferrous sulfate heptahydrate, surfactant, dressing and the like. The production process comprises the following steps of: adsorbing a liquid material on diatomite serving as the dressing; and fully mixing the liquid material, other solid materials and the diatomite serving as the dressing to obtain the agent. The agent can meet the growth demands of various microorganisms in a bioleaching composite microorganism at the same time and greatly improve sludge bioleaching efficiency.

The invention discloses a paddy rice seedling breeding matrix, and belongs to the technical field of soilless culture. The full-nutrient paddy rice seedling breeding matrix is prepared from the following raw materials: decomposed organic manure, turf, clay, zeolite powder or bentonite, vermiculite, fine river sand, rice hull powder or corn straw powder or mushroom residue powder, soybean meal, ammonium sulfate, calcium superphosphate, potassium chloride, magnesium sulfate heptahydrate, zinc sulfate heptahydrate, ferrous sulfate heptahydrate, boric acid, copper sulfate pentahydrate, manganese sulfate monohydrate and sodium metasilicate nonahydrate. The full-nutrient paddy rice seedling breeding matrix disclosed by the invention has the advantages of high fertilizer-retaining property and water-retaining property, good air permeability, high buffering, full nutrient and more persistence in fertility, achieves the pH of 5.0-5.5, and is lower in cost by utilizing agricultural wastes, namely rice hulls, corn straws, mushroom residues and the like, suitable for batch production, good in seedling breeding effect and convenient for a farmer to use.

The invention relates to a high-concentration clear liquid compound fertilizer special for drop irrigation and a production method thereof. The fertilizer is prepared by dissolving urea, liquid phosphoric acid and potassium chloride, green vitriol, zinc vitriol, boric acid and fulvic acid in water with different temperatures in two steps and then mixing the compositions. The liquid compound fertilizer has the advantages that: the liquid compound fertilizer has good physical characteristics, can not deposit for long-term storage, has full nutrients to fully supplement various elements required by crops, can accelerate the growth of a crop root system and prevent precipitation reaction from blocking drop holes, in particular, the liquid compound fertilizer can obviously activate inorganic phosphorus pool of soil and reduce pH value of limy soil so as to greatly improve utilization efficiency of nitrogen and phosphorus nutrient resources. The clear liquid compound fertilizer can be separately applied for basal application and dressing, also can be used as a foliar fertilizer after diluted, and also can be mixed with other fertilizers for application, in particular has wide application respect in drop irrigation areas with the limy soil.

The invention discloses a preparation method of polymeric aluminum ferric sulfate. The preparation method comprises the following steps of: with ferrous sulfate heptahydrate as industrial waste of titanium white as a main raw material, adding water to dissolve and adding concentrated sulfuric acid to acidize; then adding industrial aluminum sulfate to heat and stir under the condition that the bath temperature is 60-100 DEG C; stirring and adding concentrated nitric acid to oxidate; and carrying out polymerization for 30-60 min to obtain the polymeric aluminum ferric sulfate. The preparation method has the advantages of simple process, low cost and short reaction period. The flocculation performance of the polymeric aluminum ferric sulfate is better than that of the traditional industrial product and can be widely applied to feed water treatment and sewage treatment.

The invention discloses a preparation method of a polysilicate aluminium ferric flocculant, which comprises the steps of: dissolving ferrous sulfate heptahydrate, which is a by-product of a titanium white industry and used as a main raw material, in water, regulating the pH value of the dissolved ferrous sulfate heptahydrate to be 0.6-1.0, and then adding titanium white for oxidation; adding aluminum sulfate for polymerization reaction for 30-50min at the water bath temperature of 50-100 DEG C to obtain the polysilicate aluminium ferric flocculant; adding H3PO3 to be used as a stabilizer in the polymerization reaction process; adding a small amount of Na2CO3 when the liquid is even to regulate the alkalization degree of the mixed liquid to be 0.05-0.6; and finally, obtaining a dark-brown polymerized liquid product, i.e. the silicate aluminium ferric flocculant. The preparation method provided by the invention has the advantages of simple process, low cost, and no waste liquid, waste gas, and waste residues in a production process. The product has high content of active flocculation components, is superior to the traditional industrial product in full-ferric content and the flocculation property, and can be widely applied to feed water treatment and sewage and wastewater treatment.

The invention discloses a specialized biological compound fertilizer for grape. A first formula is that a total amount of nitrogen phosphor and potassium is 30% with a ratio of 1: 0.8 : 1.2; and the proportion (by weight) of each raw material is as follows: 62.8 parts of fresh semi-dried chicken manure, 0.2 part of a calcium magnesium phosphate fertilizer, 23.8 parts of potassium fulvic acid, 2 parts of borax, 1 part of copper sulfate pentahydrate, 1 part of zinc sulfate heptahydrate, 1 part of ferrous sulfate heptahydrate, 3.2 parts of amino acids, 2 parts of microbial agents, 1 part of a synergist and 2 parts of a conditioner. A second formula is that a total amount of nitrogen phosphor and potassium is 25% with a ratio of 1: 0.8 : 1.38; and the proportion (by weight) of each raw material is as follows: 76 parts of fresh semi-dried chicken manure, 4 parts of potassium sulphate, 2 parts of amino acid chelated (complexed) zinc, boron, copper and ferrum, 8.5 parts of nitrohumate,3.5 parts of amino acids, 3 parts of a microbial preparation, 1 part of a synergist and 2 parts of a conditioner. A product is obtained by stirring the above materials uniformly, spray granulating, and drying at a low temperature or air drying.

The invention discloses a manufacturing method of sulfuric acid and fine ferric ore based on ferrous sulfate heptahydrate as by-product of titanium oxide, which is characterized by the following: heating anhydrous ferrous sulfate in the rotary kiln at 700-1000 deg. c; decomposing to obtain fine ferric ore and sulfur oxide gas under reducing atmosphere; using normal two-rotation two-adsorption technique to make sulfuric acid; purifying flue gas for sulfur trioxide and little of sulfur dioxide; adsorbing sulfur trioxide through concentrated sulfuric acid to produce fuming nitric acid; making residual sulfur dioxide gas into normal one-rotation one-adsorption technique to make sulfuric acid.

The invention discloses a production method of feed grade ferrous sulfate monohydrate. Titanium white waste acid condensed slag is used as the raw material, and is subject to the processes of deacidification, pexitropy, separation, crystal transform and the like to produce the feed grade ferrous sulfate monohydrate, thereby realizing the comprehensive utilization of the titanium pigment waste acid condensed slag as the byproduct for the sulfuric acid method. The method comprises the following steps: mixing mother solutions generated in the ferrous sulfate monohydrate production processes by condensed slag and wet method, using iron powder to reduce the sulfuric acid content to 4% or so, slowly cooling and crystallizing the slurry to generatecoarse ferrous sulfate heptahydrate crystals, and separating impurities from the ferrous sulfate by using the particle size differences between the ferrous sulfate heptahydrate crystals and the impurity particles, thereby purifying the ferrous sulfate in the condensed slag and widening the application field of the condensed slag. The ferrous sulfate heptahydrate is transformed into ferrous sulfate monohydrate at high temperature to produce the qualified feed grade ferrous sulfate monohydrate in huge market demands, thereby changing the waste slag into valuable resources.

The invention provides a method for removing nitrate nitrogen in a water body, which comprises the following steps: 1, adding ferrous sulfate heptahydrate, polyethyleneglycol and graphene into deoxidized distilled water, mixing to prepare a suspension, then adding a potassium borohydride solution into the suspension, stirring, filtering, and washing to obtain graphene loaded nano iron; and 2, uniformly mixing the graphene loaded nano iron and a water body to be treated, and then performing constant-temperature oscillation treatment, thus ensuring that the removal rate of nitrate nitrogen in the water body is above 85%. According to the invention, the nitrate nitrogen in the water body is removed by using the graphene loaded nano iron, so that the method is simple in technical process, low in production cost and easy to realize popularization and application, maximally keeps the favorable characteristics of graphene and nano iron, and can efficiently and quickly remove the nitrate nitrogen in the water body, thereby obviously improving the nitrate nitrogen removal effect and having wide application value.

The invention belongs to the technical field of water pollution repair, and in particular relates to the preparation and the application of an adsorbent material suitable for removing arsenic from water. The adsorbent material is characterized by comprising the following components based on the dry basis (200kg) of a finished product: 170 to 185kg of 10 to 30-mesh coal granular activated carbon, 4.0 to 9.5kg of ferrous sulfate heptahydrate and 10.5 to 22.0kg of titanium tetrachloride; and the adsorbent material for removing the arsenic from the water is obtained by mixing the components. The adsorbent material of the invention can effectively remove the arsenic from the water and reduce the concentration of the arsenic in a water body so as to meet the sanitary standard of drinking water.

The present invention discloses a preparation method for ferric orthophosphoric acid which is lithium battery anode material, using 100 portions of ferrous sulfate heptahydrate, 41.8-48.8 portions of phosphoric acid, 21.8-38.5 portions of hydrogen peroxide or 6.36-10.0 portions of sodium chlorate, 12.0-12.5 portions of sodium hydroxide or 15.0-18.0 portions of sodium carbonate and 500-1000 portions of water for preparation. The ferrous sulfate heptahydrate, the phosphoric acid and the water are compounded into solution in a reaction vessel; the hydrogen peroxide or the sodium chlorate is added into the solution; the temperature of the solution is 50-55 DEG C, and the sodium hydroxide or the sodium carbonate is added into the solution under the condition of stirring; then the solution temperature is increased to be between 85 DEG C and 95 DEG C; the temperature is kept for 5-15 hours, and in the meantime, the solution is led into a swirler to be separated till the sulfate radical content in products is less than 0.2 percent; the solution is cooled to be at 50 DEG C for carrying out the solid-liquid separation of the products and liquid; the particle diameter of obtained ferric orthophosphoric acid is 1-2 mu m; the specific surface area of the ferric orthophosphoric acid is 48-55.5m2 / g; the tap density of the ferric orthophosphoric acid is greater than 1.6g / cm3. When the ferric orthophosphoric acid prepared with the method is used as raw material for preparing lithium iron phosphate via solid phase synthesis, the lithium battery anode material with excellent performance can be obtained.

The invention discloses an arsenic-polluted soil passivator, a preparation method and a method for controlling arsenic-polluted soil. The passivator takes rice straw, ferrous sulfate heptahydrate and hydrogen peroxide as raw materials. The preparation method of the passivator comprises the following steps: cleaning and grinding the rice straw, soaking the rice straw into a FeSO4.7H2O solution, adding H2O2 with the concentration of 30 percent according to a ratio, uniformly mixing, filtering, drying, charring the raw materials in a muffle at 300 to 400 DEG C, so as to obtain the passivator. The passivator is wide in raw material sources, low in cost and simple in preparation method, does not cause secondary pollution, efficiently utilizes the adsorption property of the rice straw, ensures that iron base is loaded on the rice straw, ensures that the iron base is polyhydroxylated through the adding of the hydrogen peroxide, is more convenient for the fixing of arsenic, improves the use effect of the passivator, and is further beneficial to the improvement of soil fertility through biological carbon component.

The invention discloses an oxidizer for trichlorethylene polluted soil, a preparation method and a use method thereof. The medicament includes an oxidant and an activator; the oxidant is a sodium persulfate solution with a mass volume ratio of 1.2 to 2.4 g / L; the activator is a ferrous sulfate heptahydrate solution with a mass volume ratio of 0.7 to 1.4 g / L and a mass of A citric acid solution with a volume ratio of 0.1g / L. The use method of the medicament comprises the following operation steps: simultaneously injecting the oxidant and the activator into the soil polluted by trichlorethylene, or injecting the activator first and then injecting the oxidant, and the volume ratio of the activator and the oxidant is 1:1. The invention has remarkable medicament removal effect, low cost and environmental friendliness.

The preparation method for battery grade ferrous sulfate heptahydrate crystal of the present invention includes using ferrous sulphate which is the by-product in the titanium dioxide production as raw material, using the operation of purification, filtration, crystallization and dryness, and preparing ferrous sulfate heptahydrate by using the difference of the solubility of ferrous sulphate changing with the temperature. The operation of purification includes performing reduction of ferric iron in ferrous sulphate which is the by-product in the titanium dioxide production to ferrous iron by using a reducing agent, adding ferrous sulfide to remove the heavy metal ions such as cobalt, nickel, zinc, copper, plumbum and cadmium, and using fluoride to remove calcium and magnesium ions. The preparation method uses vacuum drying and packaging, and the main content of ferrous sulfate heptahydrate in the dried material is more than 99.7%. The preparation method has simple technology and low cost, can recycle fluorinion by precipitation conversion, and can reduce the discharge of hazardous waste. Moreover, the prepared product has high purity, low impurity and ferric iron contents, and can be long-term storage. The recovery rate of ferrous sulphate is greatly improved.

The invention relates to a nutrient solution for improving the transplanting survival rate of trees. The nutrient solution comprises the following components in parts by weight: 0.2-0.4 part of calcium nitrate tetrahydrate, 0.03-0.05 part of ferrous sulfate heptahydrate, 0.0001-0.0003 part of ferric citrate, 0.03-0.05 part of monopotassium phosphate, 0.07-0.09 part of ethylene diamine tetraacetic acid disodium, 0.04-0.06 part of anhydrous cupric sulfate, 0.12-0.15 part of magnesium sulfate heptahydrate, 0.0005-0.0009 part of potassium chloride, 0.002-0.004 part of ammonium molybdate, 0.012-0.014 part of ammonium sulfate, 0.0025-0.0029 part of boric acid, 0.0012-0.0015 part of indolebutyric acid and 1000-1050 parts of water. The invention aims at providing the nutrient solution which can be used for rapidly and comprehensively replenishing nutrients for various trees, motivating the activities of the trees, promoting rapid development of root systems and further improving the transplanting survival rate of the trees.

The invention discloses a liquid compound trace element fertilizer and a preparation method thereof. The fertilizer comprises the following ingredients by weight percent: 0-1.0% of citric acid, 0-1.0% of ascorbic acid (vitamin C), 0-1.0% of hydroxylamine hydrochloride, 0-1.0% of sorbitol, 0-1.0% of xylitol, 0-1.0% of mannitol, 0.46-38% of ferrous sulfate heptahydrate, 0.13-24% of manganese sulfate monohydrate, 0.18-3.3% of copper sulfate pentahydrate, 0.25-2.3% of zinc sulphate monohydrate, 0.25-4% of disodium octaborate tetrahydrate, 0.08-1.5% of ammonium molybdate, and the balance of pure water, wherein the dosage of the citric acid, the dosage of the ascorbic acid and the dosage of the hydroxylamine hydrochloride cannot be 0 at the same time, and the dosage of sorbitol, the dosage of xylitol and the dosage of mannitol cannot be 0 at the same time. According to the invention, an antioxidant prepared from one, two or more of the citric acid, ascorbic acid and hydroxylamine hydrochloride can effectively inhibit ferrous ions from being hydrolyzed into ferric ions, so that the iron ion absorption efficiency is improved, and the color of the product does not change at a high temperature; the raw material resources are rich, the production cost is low, and the equipment and production technologies are simple.

The invention provides a process for co-producing sulfuric acid, fine iron powder and iron oxide red by ferrous sulfate heptahydrate and pyrite and relates to the process technology of resource utilization of titanium dioxide byproduct solid waste ferrous sulfate. The process comprises the following steps: adopting titanium dioxide byproduct ferrous sulfate heptahydrate and pyrite as raw materials; increasing the mixing amount of the ferrous sulfate heptahydrate as much as possible through transforming the ferrous sulfate heptahydrate into ferrous sulfate monohydrate, oxygen-enriched roasting, preheating air in front of a furnace, controlling the sulfur content of the pyrite entering the furnace and the moisture and other technical means; and realizing the integrated co-production of the sulfuric acid, the fine iron powder and iron oxide red pigments through cinder fractionation, oxygen-enriched calcining and other process technologies. The process effectively improves the economic value of the heptahydrate ferrous sulfate and has an important significance on efficient and comprehensive utilization of the titanium dioxide byproduct solid waste ferrous sulfate heptahydrate.

The invention provides a refining method of titanium dioxide by-product ferrous sulphate. The method comprises: (1) preparing a ferrous sulfate heptahydrate solution by using the titanium dioxide by-product ferrous sulphate; (2) adjusting a pH value of the solution to 1-2.5, and performing titanium hydrolysis of the titanium dioxide by-product ferrous sulphate; (3) adding iron powder or iron sheets into the ferrous sulfate heptahydrate solution after the titanium hydrolysis, reducing Fe<3+> in the solution, adjusting a pH value of the solution to 6.0-6.5, and performing a magnesium, manganese and zinc precipitation treatment for the titanium dioxide by-product ferrous sulphate; and (4) adding a flocculating agent into the above solution, stirring, standing, settling and filtering to obtain the refined ferrous sulphate solution. The method can effectively remove impurities such as titanium, magnesium, zinc, manganese and other ions in the titanium dioxide by-product ferrous sulphate, and obtain the high-purity refined ferrous sulphate.

The invention relates to a method for preparing a compound type multi-element flocculating agent aluminum ferric sulfate chloride polysilicate. The method comprises the following 4 steps of: dissolving and oxidizing; precipitation polymerization and filtering; compound polymerization; synthesis of the aluminum ferric sulfate chloride polysilicate. The method disclosed by the invention can be used for producing the compound type multi-element flocculating agent aluminum ferric polysilicate by integrally utilizing the waste sulfuric acid liquor, ferrous sulfate heptahydrate, waste aluminum slag and waste hydrochloric acid liquor of a titanium dioxide plant, a chemical plant and a steel and ion plant in a recycling way. The prepared flocculating agent can be widely applied to the treatment of domestic sewage and industrial wastewater, has higher turbidity, color and COD removing capacity compared with the treatment effect of polyaluminium chloride and polyaluminum ferric chloride and has the advantages of high floc forming velocity, large and compact floc, high sedimentation velocity and small sedimentary sludge size.

The invention discloses a synthesizing method for Fe-N / C-20 by doping iron atoms and taking ZIF-8 as a substrate and application in the catalyzing oxygen reduction reaction in alkaline, neutral and acid electrolytes. The method mainly comprises the following steps that at the indoor temperature, ZIF-8 with a regular shape is synthesized in methyl alcohol solvent; the ZIF-8 is dispersed in methyl alcohol, a certain amount of anhydrous phenanthroline and ferrous sulfate is added successively, the formed phenanthroline and ZIF-8 are stirred and dried, and the obtained red solid is ground into powder; the powder is subjected to high-temperature pyrolysis for 2 hours at the temperature of 900 DEG C under an argon inert atmosphere, and the Fe-N / C-20 is prepared. The oxygen reduction reaction catalyst capable of being prepared simply and applied widely is provided, has excellent catalyzing oxygen reduction performance under the alkaline, neutral and acidic conditions and can be applied to different occasions.

The invention belongs to the technical field of adsorption materials, and discloses a biochar, iron and manganese spinel composite material for adsorbing heavy metal antimony and cadmium. Solution B is dripped into suspension A at the constant speed, the solution B and the suspension A are stirred for 2.5-3.5 hours and are centrifuged, washed and dried to obtain the biochar, iron and manganese spinel composite material. The solution B is potassium permanganate solution with the concentration of 0.1 mol / L, and the suspension A comprises water, ferrous sulfate heptahydrate and from tea leaf and branch biochar according to a weight ratio of 100:(8.0-8.5):(0.8-1.2). The biochar, iron and manganese spinel composite material has the advantages that the biochar, iron and manganese spinel composite material has a large specific surface area and is large in porosity and favorable for adsorbing the heavy metal; adsorption environments are mild, and the heavy metal can be efficiently adsorbed in neutral and slightly weakly acidic environments; excellent adsorbing and removing effects can be realized by the biochar, iron and manganese spinel composite material for single heavy metal environments, and excellent heavy metal adsorbing and removing effects also can be realized by the biochar, iron and manganese spinel composite material for heavy metal antimony and cadmium co-existence environments.

The invention provides a method for separating iron, chromium, nickel, copper and zinc from high-iron high-chromium electroplating sludge leachate. The method comprises the following steps: (1) addingiron powder into the leachate to obtain a copper powder product and replaced liquid; 2) adding iron powder into the replaced liquid to obtain reduced liquid; (3) adding a chromium precipitating agentinto the reduced liquid, and carrying out filtering to obtain chromium-precipitated liquid and a chromium precipitate; (4) adding the activator antimony salt and zinc dust into the chromium-precipitated liquid, carrying out a reaction, and then carrying out filtering to obtain nickel powder and nickel-removed liquid; (5) adding an acidic phosphate extraction agent into the nickel-removed liquid to extract zinc, then carrying out reextraction by using dilute sulfuric acid, subjecting a zinc-rich solution to concentration and crystallization to prepare a zinc salt product, and subjecting zinc raffinate to subsequent treatment; and (6) subjecting the zinc raffinate to concentration and crystallization to prepare ferrous sulfate heptahydrate, and returning distilled water for leaching. The separation method of the invention has the advantages of short process and high efficiency, and can effectively solve the problem difficulties in separate separation of chromium, iron, nickel, copper and zinc metals in the high-iron high-chromium electroplating sludge leachate.

The invention provides a preparation method for an amorphous FeOOH water-purifying agent. The preparation method comprises the following steps: preparing a ferrous sulfate solution from industrial ferrous sulfate heptahydrate; adding a proper amount of sulfuric acid into the ferrous sulfate solution so as to provide an acidic environment; adding hydrogen peroxide into the solution and allowing ferrous sulfate to be oxidized into ferric sulfate under the condition of hydrolysis promotion by sulfuric acid; subjecting an industrial alkali source and the ferric sulfate solution to a precipitation reaction so as to produce iron hydroxide colloid; and dehydrating the iron hydroxide colloid under proper conditions so as to prepare the amorphous FeOOH water-purifying agent. The amorphous FeOOH water-purifying agent can effectively arsenic in water, has arsenic removal efficiency of 98% or above, does not contain aluminum ions or pose secondary pollution to a water body; after arsenic removal with the water-purifying agent, scorodite stably existing in the nature is produced, so pollution is not posed to the environment; moreover, raw materials used in the invention are of an industrial grade, and the preparation method is low in production cost and simple to operate.

A method for preparing copper powder and ferrous sulfate by using a solution leached through a sludge containing copper wet method comprises the following steps that firstly, the solution is leached through the sludge containing copper wet method and filtered; the filtered leaching agent is transferred into a reactor, iron powder is added for a replacement reaction, the concentration of Cu2+ in the leaching agent is reduced to be less than 0.5 g / L after the reaction is complete, solid-liquid separation is conducted, and the copper powder and the replaced solution are obtained; a reducing agent is added to the replaced solution, and the redox potential in the replaced solution is controlled to be reduced to be less than 400 mV; the replaced solution is transferred to an impurity removal reaction tank, heating is conducted, an inorganic solution containing phosphate radical is slowly added, solid-liquid separation is conducted, and phosphate precipitate and impurity-removed liquid are obtained; and the concentration of Fe2+ ions in the impurity-removed liquid is increased to be greater than 300 g / L after evaporation and concentration, transferring to a cooling system is conducted for crystallization, and a ferrous sulfate heptahydrate product is obtained after washing. By the adoption of the method, the cost is low, environmental protection is achieved, the added value of products is high, and resource utilization of waste resources can be achieved.