108results about How to "Alleviate resource shortages" patented technology

A method for manually-cultivating three-stage Rhizoma Paridis belonging to the technical field of agriculture includes primary seedling planting and raising, secondary seedling planting and raising, Rhizoma Paridis cultivation and field management, wherein, the primary seedling planting and raising includes the steps of presprouting of seeds and seed seedling raising, when tubers weigh 2g after 3 years, transplantation can be carried out. The secondary seedling planting and raising includes the steps that: the primary seedlings with 2g of tubers are transplanted in October and last third of November and transplantation can be carried out when the tubers are 15g after 3 years. The steps of Rhizoma Paridis cultivation and field management are that: the secondary seedlings are transplanted according to the proportion of 21,000 seedlings in per acre in October and last third of November, and mature Rhizoma Paridis can be dug after 3 years; farmyard manure is fertilized once or twice every May and last third of August with the amount of 3000kg per acre every time, or carbamide is fertilized or foliar fertilizer is sprayed for three times in the vigorous growth period; in the non-seed-collecting filed, ovaries are picked off after sepals unfold; commercial pesticide is used for preventing plant diseases and insect pests in the growth period of the Rhizoma Paridis. The method for manually-cultivating Rhizoma Paridis is characterized by less investment, early effect, good harvest, high efficient, etc., which can realize major production.

The invention discloses a method for harmless and recycling treatment of stainless steel acid washing waste water neutralization sludge, belonging to the field of harmful and valuable heavy metal resource recovery. The stainless steel acid washing waste water neutralization sludge is leached out by sulphuric acid, harmful and poisonous metals manganese, nickel and chromium enter into the leachate, and harmless treatment is carried out on the sludge. Separation, enrichment and recovery of metal resources of iron, manganese, chromium and nickel in the leachate are realized by adopting goethite method, potassium permanganate oxidation method, anion resin exchange method and chelate resin absorption method respectively, and effluent up to the standard is discharged after treatment or is returned to water consuming link in technologic process. The method of the invention has short technological flow, simple operation, management convenience, high recovery rate of valuable metal resources of manganese, nickel and chromium, recycling of multiple valuable metals is realized while the sludge is subject to harmless treatment, and unification of economic benefit, environmental benefit and social benefit is realized.

The invention relates to a recovery and comprehensive utilization method of heavy metals in stainless steel pickling wastewater sludge and discloses a method for recovering and recycling nickel and chrome in sludge generated during the treatment process of stainless wastewater. The method comprises the following steps: leading waste liquid during the pickling process to be directly used for leaching metal ions in the sludge to save the consumption of reagents; adding a certain quantity of acid or alkali in each reaction tank through arranging a plurality of reaction tanks; controlling a pH value; effectively separating various matters according to different solubility of inorganic compounds; researching and developing a recycling technology of the heavy metals in the stainless steel industrial sludge, wherein the recovery efficiency of the heavy metals like the chrome and the nickel is high; leading the recovered heavy metals to be used for smelting stainless steel; leading recovered iron to be used for preparing an efficient flocculating agent; and leading the flocculating agent to be used for sewage treatment to realize sewage reuse and save the treatment cost. The invention has the advantages of simple process and easy operation, as well as popularization and application.

The invention relates to a feed fermented by utilizing traditional Chinese medicine drugs and a preparation method of the feed. The feed is prepared from the traditional Chinese medicine drugs, straws and bran through fungus bacteria liquid in a fermenting manner and a probiotics microbial agent is added. The feed comprises 80-120 parts of the traditional Chinese medicine drugs, 40-100 parts of straws, 10-40 parts of bran, 1-10 parts of fungus bacteria liquid and 10-50 parts of a probiotics microbial agent. The feed provided by the invention is high in the content of crude protein, the growth of poultry and livestock can be promoted, the feed has the obvious effect of increasing the weight of the poultry and the livestock and improving the feed conversion efficiency, and the effect is superior to that in the prior art.

The invention provides a method for producing silicate cement by using silico-calcium dregs and carbide dregs, relating to the technical field of building materials. The method has the following steps: 1. adding carbide dregs and water into silico-calcium dregs followed by dealkalization and carrying out pressure filtering and drying on the dealkalized silico-calcium dregs if the alkali content in the silico-calcium dregs is high, or directly drying the silico-calcium dregs if the alkali content in the silico-calcium dregs is low; and drying the carbide dregs and desulfurated plaster respectively; 2. dosing and homogenizing the dealkalized silico-calcium dregs and carbide dregs after drying; 3. sending the homogenized crude materials into a rotary kiln for high temperature calcinations and obtaining the cement clinker after cooling; and 4. smashing the cement clinker and sending the smashed cement clinker and the dried desulfurated plaster into a cement grinding mill for grinding to prepare the silicate cement. Compared with the prior art, the method of the invention is simple in process, low in investment, low in production cost, low in energy consumption, and stable in the prepared silicate cement performance.

The invention discloses a method for sintering a vanadium / titanium magnetite concentrate and siderite, which comprises the steps as follows: crude fuel materials are prepared, and comprises siderite, iron ore, a flux and fuel materials; crude ore of the siderite is processed, the content of one kind of siderite with a particle grade greater than 8 mm is less than 10 wt% of the total siderite, and the content of another kind of siderite with a particle grade less than 1 mm is less than 20 wt% of the total siderite, so that the siderite is obtained, and the iron ore comprises the vanadium / titanium magnetite concentrate and other kind of iron ore; the crude fuel materials are mixed, on the basis of the total weight of the crude fuel materials, the weight percent of the siderite is 1wt%-10wt%, the weight percentage of the vanadium / titanium magnetite concentrate is 50wt%-60wt%, in addition, the weight percentage of the iron ore is 10wt% to 30wt%; mixing, material distribution, ignition and sintering are performed. According to the method for sintering the vanadium / titanium magnetite concentrate and the siderite, low-quality siderite and low-quality vanadium / titanium magnetite concentrate are used and sintered, as a result, the resource shortage can be remitted, the raw material cost is lowered, and the level of main technical indexes is kept.

The invention discloses a high-content natural shikimic acid extract product separated and prepared from waste water generated in a ginkgo leaf extract product production process and a preparing method thereof. The content of shikimic acid is higher than 98%. The waste water generated in the ginkgo leaf extract product production process is adopted as a raw material of the method, and the method includes directly subjecting the waste water to adsorption separation with anion exchange resin, allowing the eluate obtained to pass through cation exchange resin to remove sodium, subjecting a solution after sodium removal to three combined steps of adding a shikimic acid high-purity product, performing high-temperature treatment, and allowing the mixture to stand at a low temperature in order to precipitate a shikimic acid precipitate, and recrystallizing the shikimic acid precipitate to obtain the shikimic acid extract product the shikimic acid content of which is 98% or above.

The invention discloses a self-anchored thermal insulation decorative assembly type wallboard and a counter-attack preparation process thereof. The thermal insulation decorative assembly type wallboard sequentially comprises a concrete structure layer, a thermal insulation layer and a veneer layer from inside to outside, wherein the veneer layer is formed by hard thin plates, and an inner anchoring part is embedded in the back of each hard thin plate; an outer anchoring part is inserted in each inner anchoring part. The preparation process of the assembly type wallboard comprises the followingsteps: prefabricating each thermal insulation decorative integrated board with the embedded inner anchoring part veneer layer in the back, and fixing a formwork; reversely spreading the thermal insulation decorative integrated boards on a steel formwork platform one by one; installing one outer anchoring part on each inner anchoring part of each thermal insulation decorative integrated board; filling with slab joints; placing prefabricated steel bar grids or cages; pouring concrete and vibrating; maintaining; removing the formwork. The obtained self-anchored thermal insulation decorative assembly type wallboard and the counter-attack preparation process have the advantages of simple manufacturing steps, short construction period, fire safety, energy-saving and thermal insulation, and lowcost of natural granite sheet veneer.

The invention relates to an anti-blocking pressure compensation water irrigator with a uniform outlet flow and a self-adjusting function. The anti-blocking pressure compensation water irrigator comprises a base, a shell, a pressure compensation gasket and an adjusting needle, wherein the shell is buckled on the base; an inner side wall of the shell is glued with an outer side wall of the base; the pressure compensation gasket is connected with the base; a space encircled by the shell and the base is separated into two chambers; the chamber between the pressure compensation gasket and the shell is arranged as a first chamber; the chamber between the pressure compensation gasket and the base is arranged as a second chamber; a water inlet communicated with the first chamber is arranged on the shell; a water outlet communicated with the second chamber is formed on the base; energy-dissipation runners distributed along circumferential direction are arranged on the outer side wall of the base; runner inlets communicated with the first chamber are arranged at one end of the energy-dissipation runners; runner outlets communicated with the second chamber are arranged at the other end of the energy-dissipation runners; the adjusting needle is located in the second chamber; the root part of the adjusting needle is connected with the pressure compensation gasket and the head part extends to the water outlet.

The invention discloses a method for extracting aluminum oxide from coal gangue, which comprises the following steps of: mixing and grinding the broken coal gangue and sodium carbonate in a certain ratio, roasting, performing circular extraction, precipitating, filtering, decomposing carbon, recycling carbon dioxide and an auxiliary agent, washing, calcining and the like to extract high-purity aluminum oxide from fly ash. Compared with other methods for extracting aluminum hydroxide from the fly ash, the method has the advantages that: the extraction ratio of the aluminum hydroxide is high, residues are a few, energy consumption is low, the process is simple, cost is low, the generated CO2 and the used auxiliary agent raw material can be recycled, and the like; and the problems of a complicated technology and high cost of the conventional process for extracting the aluminum hydroxide from the fly ash are solved, and a new way is opened up for the high-added value development and utilization of the coal gangue.

The invention relates to poultry feed and particularly relates to whole wheat type anti-stress egg-laying duck feed. The feed comprises a major material part and a premixture part and specifically comprises the following components in parts by weight: 450-520 parts of wheat, 70-110 parts of soybean meal, 100-180 parts of American DDGS (distillers dried grains with solubles), 0-50 parts of domestic DDGS, 40-80 parts of rapeseed meal, 0-50 parts of beer lees, 80-90 parts of stone dust, 5-7 parts of calcium hydrophosphate and 12 parts of premixture. The whole wheat type anti-stress egg-laying duck feed disclosed by the invention is proved to have the following advantages: 1) the raising cost of egg-laying ducks can be greatly reduced, and the economic benefits of cultivation of the egg-laying ducks can be improved; 2) corn is not used in the feed, but by adding an enzyme preparation and a microbial preparation and playing a balancing role through amino acids, the egg-laying performance can be maintained and even improved, and the problem of shortage of corn sources can be alleviated to a certain extent; and 3) vitamin E, vitamin C, gamma-aminobutyric acid, lycine and other substances, which are used in the feed, can effectively improve the stress capability of the egg-laying ducks, be conductive to stability in egg laying of the egg-laying ducks and improve the egg-laying performance of the egg-laying ducks.

The invention discloses a method for producing white carbon black by using high alumina fly ash and a system thereof, relating to the technical field of material and chemistry. The invention comprises a fly ash slurry blending system, a fly ash pre-desiliconization system, a white carbon black preparation system and a caustification system. the structure is characterized in that the sleeve heater is divided into two sections; the outlet passage at the lower part of a heat preservation stay pot is divided into two paths; the solution outlet of a tube type falling film evaporator is connected with one inlet of a circulating mother liquor preparation tank through an evaporating solution pump, and one of the other two inlets of the circulating mother liquor preparation tank is alkali supplementing passage and the other thereof is connected with the outlet of a caustification tank through a caustification solution pump; the outlet passage of the circulating mother liquor preparation tank is connected with the inlet of a fly ash slurry preparation tank through a circulating mother liquor pump, so that the whole system forms a closed circulation. The invention is simple in process, low in production cost, low in energy consumption, and stable in performance of the products, meanwhile the fly ash of which white carbon black is extracted out can be used for preparing aluminium oxide as an important aluminium resource.

The invention discloses a method for extracting alumina from coal ash. The method comprises the following steps: mixing the coal ash with sodium carbonate in a certain proportion and then grinding; and then extracting the high-pure alumina from the coal ash through the steps such as roasting, circular leaching, precipitation and filtration, carbonating, carbon dioxide and auxiliary recovery, washing, calcination and the like. Compared with the other methods for extracting the alumina from the coal ash, the method in the invention has the advantages of high aluminum hydroxide extraction rate, small residue, low energy consumption, simple and direct technology process, low cost, recoverable and recyclable CO2 and used auxiliary raw material and the like, thereby breaking through the bottleneck of complicated technology and high cost in the existing process for extracting the alumina from the coal ash and creating a new way for development and utilization of high added value of the coal ash.

The invention provides a tobacco material classifying device and classifying method. The equipment comprises a winnowing box machine body, a tangential material discharging device and a classifying filtering mesh belt; the top of the winnowing box machine body is connected with the tangential material discharging device; the classifying filtering mesh belt is located on the upper portion of the winnowing box machine body, penetrates into one side of the winnowing box machine body and penetrates out of the other side of the winnowing box machine body; after the classifying filtering mesh belt penetrates out of the winnowing box machine body, a conveying device is arranged under the classifying filtering mesh belt. According to the tobacco material classifying device and method, materials move upwards through wind power, sundries fall into a sundry falling area due to the fact that the self gravity is larger than the wind power, cut rolled stems float and move upwards to a filter area, pass through the classifying filtering mesh belt and then collected and output, and flaky cut rolled stems are attached to the lower surface of the classifying filtering mesh belt, are taken out of the winnowing box machine body by the classifying filtering mesh belt, fall into the conveying device and then are discharged. Therefore, continuous, steady and uniform material classification is achieved, the defects that a traditional vibrating screen classifier is high in tobacco damage ratio, low in classification rate and the like are overcome, and the classification and usage requirements for different cut rolled stem forms in cigarette processing can be met.

The invention discloses an immobilized graphite carbon nitride functional-bamboo and a preparation method thereof. C3NC13 and NH4C1 are used as raw materials and are heated and pressed to prepare the immobilized g-C3N4 functional-bamboo under a specific solvent. In the practical application, the bamboo can decompose volatile organic contaminants such as formaldehyde, benzene, methylbenzene and the like very well, has functions of anti-microbial and sterilization, and contaminants attached to the bamboo can be easily removed. Moreover, the performances of resisting mildew, worm eating and decay of natural bamboo are increased to some extent. The success of the technology has an important practical significance on alleviating shortage of wood resources, expanding the range of application of bamboo and maintaining the sustainable development.

The invention discloses a cellulose base flexible zinc oxide ultraviolet photoelectric detector and a preparation method therefor. The method specifically comprises the steps: taking a high-haze transparent cellulose film as a substrate, growing a zinc oxide semiconductor film through a magnetron sputtering method, enabling an interdigital electrode mask to be closely attached to the zinc oxide semiconductor film, growing a metal thin layer on the interdigital electrode mask and a zinc oxide semiconductor film interdigital electrode mask which is not covered by the interdigital electrode mask through an electron beam evaporation method, manufacturing a metal electrode on the zinc oxide semiconductor film after the interdigital electrode mask is removed, and finally preparing and obtaining the cellulose base flexible zinc oxide ultraviolet photoelectric detector. According to the invention, the high-haze transparent cellulose film is taken as the substrate for growing the zinc oxide semiconductor film, and the flexible ultraviolet photoelectric detector is prepared. The detector has the feature response for the ultraviolet light, and is flexible and bendable. The high-haze transparent cellulose substrate can achieve the light tripping effect, thereby improving the responsivity of the ultraviolet photoelectric detector.

This invention relates to methods for culturing granular sludge and utilizing the granular sludge to recover gold from wastewater containing gold. The method for culturing granular sludge comprises: (1) collecting sludge from the aeration tanks of a wastewater treating plant, washing with physiological saline, and discharging the supernatant; (2) adding 1 / 4-1 / 2 culture medium to the sludge, adjusting the pH value to 6.8-7.6, stirring evenly, standing in the dark at 15-25 deg.C, changing the culture medium every two days to obtain the granular sludge after 12-20 times. The method for recovering gold comprises: (1) adding the granular sludge to wastewater containing gold, and placing in a thermostatic shaking bed; (2) adsorbing adequately, precipitating by gravity, adding a replacing metal to the desorption solution to obtain gold. The methods have such advantages as high gold ion adsorption rate (99.9-100%), high desorption rate (99.5%), and high gold recovery rate (higher than 98.3%).

The invention discloses a refuse landfill sealing top layer and a preparation method and application thereof, and belongs to the technical field of landfill. The sealing top layer comprises at least three functional layers, the functional layers comprise a water storing layer, a guiding discharging layer and a low-permeability layer which are successively stacked from outside to inside, and the water storing layer is mainly composed of recycled fine aggregates with the particle size less than 5 mm; the guiding discharging layer is mainly composed of recycled coarse aggregates with the particlesize between 10 mm-40 mm; the low-permeability layer is mainly composed of natural soil; the processing of building rubbish is conducted to obtain the recycled fine aggregates and the recycled coarseaggregates. The sealing top layer is composed of the above particle size combinations of the recycled building rubbish aggregates and the natural soil, the seepage-proofing and leakage stopping functions are effectively achieved, rubbish is filled with rubbish, the recycle of the building rubbish is achieved, the capacity occupied by the building rubbish in a landfill is released, and compared with a traditional soil sealing top layer, the refuse landfill sealing top layer has the advantages that the consumption of soil resources is greatly reduced, the construction is simple, raw materials can be conveniently obtained, the cost is low, and the durability is good.

The invention relates to a waste polyester-cotton textile degrading and recycling process and system. According to the waste polyester-cotton textile degrading and recycling process, high-concentration phosphoric acid and cotton fibers in polyester-cotton are reacted at first, water-soluble cellulose phosphate ester is generated, and primary separation of polyester and the cotton fibers is completed; then the cotton fibers are separated out through hydrolysis, and pure cotton fibers are obtained; and alkali liquor is added into reaction liquid subjected to acidolysis for alkaline hydrolysis, water-soluble sodium terephthalate is generated through sodium hydroxide and the polyester and further hydrolyzed to generate terephthalic acid, the obtained terephthalic acid is subjected to direct esterification through ethanediol, polyethylene glycol terephthalate, namely PET is obtained, and subsequent cyclic utilization is facilitated. Through the waste polyester-cotton textile degrading and recycling system, the waste polyester-cotton textile degrading and recycling process can be completely efficiently, and the cotton fibers and the polyethylene glycol terephthalate which are high in purity and facilitate subsequent cyclic utilization are obtained.

The invention relates to the technical field of organic fertilizers, particularly an organic fertilizer containing wormcast and rice bran and a preparation method thereof. By properly proportioning the wormcast, cattle manure, oil cake, rice bran and ferment in combination with fermentation treatment (especially biofermentation technique) in the preparation technique, the fertilizer efficiency of the organic fertilizer prepared from the wormcast, cattle manure and the like is enhanced, so that the organic fertilizer is beneficial to the enhancement of the germination rate of crops and can not cause ignition on seeds; and thus, the people do not need to purposefully avoid mixing the fertilizer and seeds during crop planting, thereby lowering the crop planting difficulty. In addition, by combining the introduction of the wormcast, cattle manure, oil cake and the like, the prepared organic fertilizer has higher fertilizer efficiency than the independent wormcast, thereby lowering the crop planting cost on the premise of low wormcast amount and unavailable raw material at present.

The invention discloses a catalyzing cracking coking mother particle (material), which is characterized by the following: the mother particle (material) is composed of adhesive coking agent, catalyzing cracking catalyst, coke and non-coke coal, wherein the adhesive coking agent is self-waste plastic with resin, latex, industrial waste catalyst with iron and iron ore, which utilizes non-coke coal to produce regular coke with coking coal.

The invention discloses clean motor gasoline. The motor gasoline is prepared from the following raw materials in percentage by weight: 2 to 50 percent of methyl acetate, 30 to 95 percent of normal gasoline, 2 to 20 percent of additive A and 1 to 10 percent of additive B, wherein the additive A is one or a combination of more than two of naphtha, petroleum ether and solvent oil; and the additive B is one or a combination of more than two of methyl ten-butyl ether, methylal, cyclopentadiene manganese tricarbonyl, methyl cyclopentadiene manganese tricarbonyl, iso-heptyl ester, tert-butyl ethyl ether, isopropanol, C7 aromatic hydrocarbon, C8 aromatic hydrocarbon and C9 aromatic hydrocarbon. Through detection of authorities, results prove that various indexes of the fuel meet the motor gasoline standard of China, and the fuel has the characteristics of high octane number, high cleanness, low energy consumption and strong power.

The invention discloses a composite catalyst for directly preparing high-value aromatic hydrocarbons from carbon dioxide. The catalyst has a three-layer porous core-shell structure, the inner layer isa metal modified metal oxide, the middle layer is a microporous SiO2 thin layer coated with the metal modified metal oxide, the outer layer is an HZSM-5 molecular sieve layer, and the metal oxide ismodified by at least one of sodium, potassium, zinc, manganese, cerium and zirconium. The preparation method of the composite catalyst for directly preparing the high-value aromatic hydrocarbons fromcarbon dioxide is simple, the precursor is cheap and easy to obtain, and the prepared catalyst is high in mechanical strength, strong in reducing capacity and high in stability and has industrial application prospects.

The invention discloses a method for preparing a release agent from waste engine oil, and relates to a method for preparing a release agent. The method comprises the following steps: carrying out pre-treatment on waste engine oil; carrying out preheating modification on an oil product, wherein the required heating temperature is 90 DEG C, the heating agitation time is 30 minutes, the heating agitation time also can be prolonged or shortened while the oil product is increased or reduced, and is not shorter than 20 minutes until stable foams can be formed on the surface; adding alkali liquor to the pre-treated oil product; saponifying CaO or NaOH, and simultaneously finishing the emulsification process; grasping the oil-alkali ratio, the water yield, the time and the temperature; taking CaO to dissolve into water; adding a little of oil to the solution each time, and adding the oil again after evenly mixing, wherein the reaction time is 1.5 hours, and the temperature is 78-80 DEG C; adding a little of water after a period of time in the agitation process, and keeping the total volume invariable. The release agent prepared by the method can be widely applied to a building industry, a household appliance industry, a toy industry, a medical industry and the like, and has a positive meaning on improvement of waste engine oil flooding and energy shortage.

The invention discloses a compound feed for meat ducks in age of 0-46 days. The compound feed is prepared from the following raw materials: corn, hard red wheat, maize embryo cake, corn protein powder, soybean meal, peanut meal, cottonseed meal, double-low rapeseed meal, poultry oil, mountain powder, calcium hydrogen phosphate, table salt, wheat enzyme, lysine sulphate, methionine, threonine, tryptophan, choline chloride, vitamin premix and trace element premix. The compound feed disclosed by the invention has the beneficial effects that: the raw materials of the feed for meat ducks are reasonable in portioning, a lot of wheat is adopted for substituting corn in the feed, and the wheat enzyme is reasonably added on the basis, thus the shortage of feed resources in China can be alleviated,digestibility of meat ducks to wheat is improved, production performance of meat ducks is improved while carcass indexes of meat ducks are improved, technical support is provided for application and development of raw materials of a lean-meat duck feed, and higher social value can be created.

The invention discloses a preparation method of a rubber paint containing epoxidized gutta-percha, and belongs to the field of rubber paint preparation method. According to the preparation method, gutta-percha is subjected to two times of purification, emulsion method is adopted for epoxidation modification of the gutta-percha so as to obtain epoxidized gutta-percha; the prepared epoxidized gutta-percha is dissolved in a certain amount of a solvent, and an obtained mixture is subjected to heating stirring in a water bath pan; after complete dissolving of gutta-percha, a certain amount of resinand a certain amount of a solvent are mixed at a certain mass amount, a certain time period later, a certain amount of a curing agent and a certain amount of an anti-foaming agent are added into an obtained mixture, ultrasonic vibration is adopted for mixing, and stirring is adopted for uniform mixing so as to obtain a coating, and paint performance is detected. According to the preparation method, gutta-percha epoxy degree is changed and matrix ratio is changed for coating, and coating layer performance is tested. The obtained rubber paint is uniform in dispersion, and excellent in appearance and performance, and the paint corrosion resistance and clunging fore are improved effectively.

The invention relates to a preparation method for a regenerated wood plastic composite material, and belongs to the technical field of macromolecular material preparation. The preparation method comprises the steps: pretreating regenerated polyethylene, regenerated polypropylene and PVC, carrying out co-mixing modification with styrene butadiene rubber, POE and a superfine talc powder to prepare a basic material of the wood plastic composite material, then compositing with modified wood flour, and preparing the regenerated wood plastic composite material. The selected regenerated polyethylene and regenerated polypropylene are both regenerated recycled materials, and the utilization value of the regenerated plastics is effectively improved; with deep processing utilization of the wood flour, recycling reutilization of the biomass material is realized, and the ecological environment is protected. The regenerated wood plastic composite material prepared by the composite modification technology has the characteristics of light weight, high rigidity, high toughness and recyclability; and the product after forming and processing is more lignified, and has more superior performance and wider use scope than wood plastic products modified by single polyolefin or PVC and wood flour.

The invention relates to anti-seepage iron tailings concrete and a preparation method thereof. The concrete is prepared by replacing an ordinary concrete coarse aggregate with iron tailings balls, replacing a fine aggregate with iron tailings powder and adding an admixture, water and a water reducing agent. The concrete comprises the following components in percentage by mass: cement 14% to 17%, iron tailings ball 42% to 52%, iron tailings powder 28% to 34%, water reducing agent 0.14% to 0.17 %, admixture 0.28% to 0.34%, and water 5.2% to 6.3%. The admixture comprises the following componentsin percentage by mass: calcium oxide 20% to 40%, calcium chloride 20% to 40% , and sodium nitrate 30% to 50%. According to the invention, the concrete aggregate is replaced with iron tailings completely, that is, the replacement rate reaches 100%, thereby greatly improving the recovery and utilization ratio of the iron tailings, and turning the iron tailings, which is waste, into treasure. The added admixture effectively improves the gas permeation resistance and the chloride ion permeation resistance of the tailings concrete.

The invention provides a preparation method of sodium hexafluoroaluminate, and belongs to the technical field of preparation of sodium hexafluoroaluminate. The preparation method provided by the invention comprises the following steps: mixing denitrified aluminum ash with sodium hydroxide, carrying out alkaline leaching reaction, and separating to obtain a supernatant solution; and crystallizing the supernatant solution to obtain the sodium hexafluoroaluminate. According to the method, the denitrified aluminum ash is used as a raw material, and the F element in the aluminum ash is fixed whilethe Al element in the aluminum ash is finely taken through alkaline leaching reaction, so that aluminum and aluminum oxide in the aluminum ash can be utilized at the same time, and the aluminum ash can be harmlessly treated; and the sodium hexafluoroaluminate is prepared through crystallization, and the purity of the sodium hexafluoroaluminate is high.