142 results about "Sodium sulfide" patented technology

The invention relates to the technical field of crushers, and discloses a crusher for bulk materials after sodium sulfide calcination and a crushing process thereof.The crusher mainly comprises a dust removal mechanism, the dust removal mechanism is fixedly arranged on the right side of the bottom end of a working shell and used for cleaning dust in the working shell, and the dust removal mechanism comprises a dust storage box; a moving assembly is arranged in the dust storage box and used for cleaning the first filter screen and the second filter screen. When the moving assembly works, the moving piston drives the moving shaft to work, so that the moving part moves in the dust storage box, the second filter screen is effectively rubbed, the first filter screen is impacted, dust on the first filter screen and the second filter screen is fully cleaned, and the dust removal mechanism is effectively and timely self-cleaned; and resistance increase and suction reduction caused by dust accumulation are prevented, so that the dust removal efficiency is improved, the working shell does not need to be shut down to treat dust, and the working efficiency is improved.

The invention provides a method for synergistically recovering all elements of crystal silicon cells of a decommissioned photovoltaic module, which comprises the following steps of: collecting large-particle waste crystal silicon cells and grinding the large-particle waste crystal silicon cells to obtain powder; the powder is leached with nitric acid, and leach liquor and impurity-removed silicon powder are obtained; leaching the silicon powder subjected to impurity removal by using an HF solution to remove a silicon nitride layer, and filtering, washing and drying to obtain the silicon powder meeting the industrial standard; the leaching solution is subjected to chlorination precipitation to obtain silver chloride and a leaching solution with silver removed, and after the silver chloride is filtered, the silver chloride is subjected to acid pickling and water washing to obtain silver chloride; sodium sulfide is added into the leaching solution after silver removal, metal in the leaching solution is precipitated, and a solution containing Al < 3 + > can be obtained after filtering; the method comprises the following steps: adding an alkaline substance into a solution containing Al < 3 + >, filtering to obtain an aluminum hydroxide precipitate, and washing the aluminum hydroxide precipitate to remove foreign ions adsorbed on the surface; one technical effect of the invention is that collaborative recovery and treatment of each element in the waste crystal silicon battery piece are realized.

A beneficiation method for improving a grade of a magnesium-containing copper sulfide ore concentrate includes: crushing and grinding an ore to a fineness degree allowing 55% to 65% of particles to pass through a 0.074 mm sieve, adding an adjusting agent lime, collecting agents butylxanthate and kerosene, and a foaming agent methyl isobutyl carbinol (MIBC) to obtain a copper-molybdenum-sulfur mixed concentrate; re-grinding the copper-molybdenum-sulfur mixed concentrate to a fineness degree allowing 75% to 82% of particles to pass through a 0.048 mm sieve, adding lime, a magnesium-containing silicate inhibitor, a collecting agent 1, and MIBC to obtain a copper-molybdenum mixed concentrate; and adding sodium sulfide, kerosene, and MIBC to the copper-molybdenum mixed concentrate to obtain a high-grade copper concentrate. The beneficiation method adopts mixed flotation of copper-molybdenum, regrinding for separating copper and molybdenum from sulfur, and magnesium removal from a copper concentrate to allow quality improvement for the copper concentrate.

The present invention discloses a combined flotation regulator for high-mud lead-zinc oxide ores and its application method. The combined regulator consists of regulator A and regulator B in a mass ratio of 1:(3-10); regulator A is a high-molecular polysaccharide substance; regulator B consists of B1 and B2, with B1 being 80-90 parts by mass and B2 being 10-20 parts by mass; B1 is sodium silicate, and B2 is at least one of polyaminopolyether methylene phosphonic acid, polyepoxysuccinic acid, and 2-butanephosphonate-1,2,4-tricarboxylic acid. The application method is as follows: grinding the raw ore, sequentially adding sodium carbonate, regulator A, regulator B, and sodium sulfide for slurry mixing, and finally adding a collector for zinc oxide mineral flotation to obtain a zinc oxide coarse concentrate. The present invention can effectively recover zinc oxide minerals in high-mud lead-zinc oxide ores, the reagent components are non-toxic and harmless, the application method is simple, and it is convenient for large-scale production management.

The invention discloses a combined collecting agent in low-grade copper-molybdenum ore and application of the combined collecting agent, and belongs to the technical field of mineral separation. The method comprises the following steps: firstly, adding lime into raw ore as an inhibitor, grinding the ore, adding kerosene and butyl acrylate (or butyl methacrylate) as a combined collecting agent and a foaming agent, carrying out one-time roughing, two-time concentrating and three-time sweeping operation to obtain copper-molybdenum bulk concentrate, stirring the copper-molybdenum bulk concentrate for reagent removal, and then carrying out copper-molybdenum separation operation; sodium sulfide and sodium thioglycollate are added as inhibitors, and copper concentrate and molybdenum concentrate are obtained after one-time roughing, four-time concentrating and three-time sweeping operation; butyl acrylate (or butyl methacrylate) involved in the method has a foaming effect, kerosene and butyl acrylate (or butyl methacrylate) are used as the combined collecting agent, a foaming agent does not need to be added in the process, the ore dressing cost is reduced, and meanwhile efficient recovery of copper-molybdenum minerals is achieved.

A treatment composition for remediating for remediating hydrogen sulfide (H2S), carbon dioxide (CO2) and other contaminant(s) in a fluid, including: an organic or hydrocarbon based liquid; at least one hydroxide compound or a hydrate thereof; and sodium sulfide (Na2S) or a hydrate thereof.

The invention discloses a (Fe (OH) 2) ((OH) 0.25 (H2O) 0.5) / W18O49 composite material as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The preparation method comprises the following steps: uniformly mixing and stirring cyclohexanol, acetylacetone and absolute ethyl alcohol, adding tungsten hexachloride, uniformly stirring at room temperature, then adding ferric trichloride, uniformly stirring at room temperature, carrying out hydrothermal reaction, washing and drying to obtain the (Fe (OH) 2) ((OH) 0.25 (H2O) 0.5) / W18O49 composite material. A mixed system of cyclohexanol, acetylacetone and absolute ethyl alcohol is utilized to synergistically solve the problems of advanced hydrolysis and agglomeration of metal ions; the oxygen vacancy of the W18O49 accelerates the conversion of the sodium polysulfide, and the Fe (OH) 2 derivative strengthens the chemical anchoring of the sodium polysulfide, thereby realizing the synergy of the anchoring and rapid conversion of the NaPSs. When being used as a sodium-sulfur battery positive electrode material catalyst, the catalyst shows excellent catalytic performance and rate capability, and still has the capacity of 420 mAh g <-1 > after circulating for 25000 circles under the large current density of 10 A g <-1 >. The strong adsorption characteristic of the hydroxylated iron-based component and the high catalytic activity of W18O49 are utilized to form a synergistic effect, and a new scheme is provided for breaking through the technical bottleneck of an RT Na-S battery.

The invention relates to the technical field of waste acid resource utilization, and provides a method for producing iron oxide black and manganese carbonate by using iron-containing waste hydrochloric acid, which comprises the following steps: S1, adding ferrous oxide waste mud into ferrous chloride-containing waste hydrochloric acid, and extracting to obtain an organic phase and a water phase; s2, hydrochloric acid and first manganese oxide mineral powder are added into the 70 wt% water phase, and first filtrate and first filter residues are obtained; s3, adding a first alkaline material into the first filtrate to obtain a ferric oxide and manganous chloride solution; s4, mixing ferric oxide with the remaining water phase, and adding a second alkaline material to obtain iron oxide black; s5, manganese dioxide mineral powder and sodium sulfide are added into the manganous chloride solution, and second filtrate and second filter residues are obtained; and S6, adding sodium carbonate into the second filtrate to obtain a manganese carbonate and sodium chloride solution. According to the technical scheme, the problems of low purity and poor resource utilization effect of the iron oxide black obtained from the iron-containing waste hydrochloric acid in related technologies are solved.

The present application relates to the technical field of extracting rare earth, and particularly relates to an extraction rare earth separation process method. Fluorine-carbon cerium ore crude ore is treated to obtain activated ore powder. The activated ore powder is subjected to alkali pressure boiling oxidation, roasting transformation and optimal dissolution leaching to obtain a purified liquid. The purified liquid is then subjected to barium chloride sulfuric acid removal, lead removal by sulfurized lead, pH adjustment and the like to obtain a low-impurity chlorinated rare earth liquid. The chlorinated rare earth liquid is subjected to multi-stage extraction to obtain a neodymium chloride solution, a praseodymium-neodymium chloride solution and a lanthanum-cerium chloride solution. The solutions are subjected to oxalic acid precipitation and calcination to obtain a rare earth oxide product. The present application adopts fine pretreatment, multi-stage differential extraction and purification processes to achieve efficient separation of lanthanum-cerium, praseodymium-neodymium and neodymium in fluorine-carbon cerium ore and improve product purity.

The present invention discloses a step-by-step enhanced recovery method for recovering multiple complex copper ores. The method includes grinding the sample to an appropriate particle size, then directly flotating copper sulfide using amyl xanthate. The tailings from the flotation of the copper sulfide are then deslimed. After desliming, the tailings are activated with sodium sulfide and free copper oxide is flotated using amyl xanthate and butyl ammonium black powder as collectors. Ethylenediamine phosphate is then used for enhanced activation, followed by the addition of sodium sulfide and amyl xanthate and butyl ammonium black powder as collectors to flotate bound copper oxide. Finally, high-gradient strong magnetic separation is used to recover weakly magnetically bound copper oxide that is difficult to float and contains adsorbed or fine particles of iron, manganese, cobalt, and other minerals. The method achieves a total copper recovery rate exceeding 85%, which is more than ten percentage points higher than the global average recovery rate for copper oxide ores. This method effectively addresses the current technical problem of low recovery rates for copper oxide ores using a single process.

This invention discloses a method for preparing high-purity Si-75, comprising: S1, adding sodium sulfide, sulfur, and deionized water in a molar ratio of 1:(1.0~1.1):(5~8) to a reaction vessel, adding a buffer, and reacting at 80~90℃ for 1~2h; S2, adding a phase transfer catalyst and a hydrolysis inhibitor to the system, adding γ-chloropropyltriethoxysilane dropwise, and reacting at 85~95℃ for 3~5h, allowing the mixture to stand and separate into layers after the reaction, to obtain an organic phase; S3, subjecting the organic phase to short-path distillation and then filtering to obtain high-purity Si-75. Compared with existing technologies, this invention uses a phosphorus-free buffer system, which simplifies waste treatment. It uses water as the reaction medium and does not use large amounts of organic solvents, making it suitable for continuous industrial production. By adding hydrolysis inhibitors, hydrolysis can be effectively prevented during the reaction, increasing safety. The short-path distillation method provides high purification efficiency and can quickly remove impurities. The product has a disulfide content of ≥98.5% and a color of 0 (Gardner color number), which is of great significance to the light-colored rubber industry.

The invention relates to the technical field of solid waste treatment and resource utilization, and particularly discloses a waste incineration fly ash harmless treatment method based on water washing-sulfide cooperative circulation. The method comprises the following steps: firstly, carrying out crushing, drying and sieving pretreatment on the fly ash; secondly, carrying out water washing desalination and detoxification on the fly ash by adopting deionized water under the conditions of optimized liquid-solid ratio, water washing temperature, time and stirring rate, and carrying out solid-liquid separation to obtain water-washed fly ash and water washing liquid; then adding a sodium sulfide solution with a certain concentration and proportion into the water washing liquid, and removing heavy metal ions through reaction, centrifugation and membrane filtration to obtain purified water washing liquid; and finally, the residual sulfur ions in the purified water washing liquid are partially recycled to the untreated water washing liquid, so that closed circulation of the sulfur ions and medicament saving are realized. By means of the method, the leaching concentration of Cl and heavy metal in the fly ash can be remarkably reduced, the fly ash can meet the hazardous waste landfill pollution control standard (GB18598-2019), and the treated washing liquid can reach the first-level emission limit value of the integrated wastewater emission standard (GB8978-1996). Compared with a traditional solidification / stabilization method, the method has the advantages of being high in desalination rate, high in heavy metal removal efficiency, low in energy consumption, low in operation cost, near-zero in emission and the like, and an efficient, economical and environment-friendly solution is provided for harmless treatment and resource utilization of the waste incineration fly ash.

The invention relates to the technical field of preparation of organic silicon functional materials, and particularly discloses an integrated preparation method of bis-[gamma-(triethoxy silicon) propyl] tetrasulfide-chloromethyl phenethyl triethoxy silane mixed silane, which comprises the following steps: by taking a chloropropyl triethoxy silane-chloromethyl phenethyl triethoxy silane mixture as a raw material, carrying out one-step reaction on the raw material to obtain bis-[gamma-(triethoxy silicon) propyl] tetrasulfide-chloromethyl phenethyl triethoxy silane mixed silane, and carrying out one-step reaction on the bis-[gamma-(triethoxy silicon) propyl] tetrasulfide-chloromethyl phenethyl triethoxy silane mixed silane; in the whole process, a reaction system and process parameters are reserved and designed around the function of chloromethyl phenethyl triethoxy silane, and the overall production efficiency is improved by shortening the time consumption of a sodium sulfide synthesis procedure; the target mixed silane is prepared through four core processes of sodium sulfide synthesis, sodium polysulfide in-situ preparation, selective vulcanization in a phosphate buffer system and product homogenization in sequence. According to the invention, a one-step integrated preparation method is innovatively adopted to replace a traditional compounding process, the total impurity content of the product is less than 0.6%, the equipment investment cost is reduced, and the overall production efficiency is improved.

A method for treating polluted acidic wastewater from smelting with an activated pyrite concentrate includes: drying and grinding a pyrite concentrate, and washing twice to produce a washed pyrite concentrate powder; mixing the washed pyrite concentrate powder with a Na2S powder to produce a mixed powder, and adding purified water; allowing a reaction for 3.5 h to 4.5 h; filtering to produce an activated pyrite concentrate; subjecting the activated pyrite concentrate to aeration and standing, drying, and grinding to produce an activated pyrite concentrate powder; adding a lime slurry to the wastewater to adjust a pH; adding the activated pyrite concentrate powder, and allowing an ultrasonic treatment, continuous stirring is conducted; allowing a settlement to produce a first supernatant; adding a lime slurry to the first supernatant to adjust a pH; further allowing a settlement to produce a second supernatant; and separating the second supernatant.

A method of digesting lignocellulosic material includes mixing lignocellulosic material comprising lignocellulosic biomass, a polymeric naphthalene sulfonate, sodium xylene sulfonate, and a white liquor comprising sodium hydroxide and sodium sulfide to form a mixture. In addition, the method further includes heating the mixture to digest at least a portion of the lignocellulosic material.

The application discloses a copper-lead separation inhibitor and a preparation method and an application method thereof, and the preparation method comprises the following steps: mixing acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite, and performing emulsification and dispersion to obtain a uniform viscous suspension. The application method comprises the following steps: adding active carbon, sodium sulfide, the copper-lead separation inhibitor, a collector Z-200 and a foaming agent No. 2 oil into copper-lead mixed concentrates to perform copper-lead separation flotation operation; performing three times of cleaning on the copper rough concentrates; and performing three times of scavenging on the obtained lead rough concentrates. The inhibitor composition is non-toxic; the inhibitor is rich in carboxyl and sulfonic acid groups, and under the action of the two main groups, the adsorption effect of the inhibitor on the surface of galena can be enhanced; the inhibitor can be used under neutral, weak acidic and weak alkaline conditions, has strong inhibition effect on galena, is strong in selectivity, is easy to obtain and store, is friendly to the environment, and can effectively improve the flotation separation indexes of copper-lead sulfide ores.

The present application belongs to the technical field of non-ferrous metallurgy, and particularly relates to a method for cooperatively removing copper, arsenic, tellurium and lead in crude bismuth, which comprises the following steps: S1, obtaining molten bismuth liquid by melting, adding an oxidizing agent to the molten bismuth liquid, and performing a pre-oxidation reaction under stirring; S2, adding a composite removing agent and a fluxing agent to perform a reaction, and then removing surface dross; the composite removing agent comprises iron powder, bismuth phosphate and sodium sulfide; S3, adding the crude bismuth after step S2 to a vacuum rectification furnace, vacuum heat-insulating, and outputting refined bismuth. Through the cooperative design of pre-oxidation activation, in-situ sulfidation and phosphate slagging, the present application realizes the simultaneous and efficient removal of impurities such as Cu, As, Te and Pb, and the effective recovery of Ag. Subsequent vacuum distillation further removes residual lead in depth, and ensures that the refined bismuth product reaches a high standard.

The invention discloses a composite foliar conditioner for reducing cadmium accumulation in brown rice and an application method thereof, relating to the technical field of agriculture. The composite foliar conditioner comprises: NaHS at a concentration of 20-30 μmol / L; sodium sulfide at a concentration of 2-4 mmol / L; aspartic acid at a concentration of 10-15 mg / L; and Tween 80 at a concentration of 0.1-0.3 g / L; and the remainder being water. Starting from the heading stage of rice, the composite foliar conditioner is sprayed at a rate of 20-30 kg per mu; sprayed once every 7-10 days, and sprayed continuously for 3-5 times. The invention utilizes the synergistic effect of NaHS, sodium sulfide, and aspartic acid, adopts a surfactant to increase the spreading area, and thereby significantly improves the cadmium reduction effect of brown rice, with the cadmium reduction efficiency being able to reach over 80%. The foliar conditioner has simple ingredients, is easy to operate, and has outstanding effects.

The invention discloses a segmented intensified leaching arsenic removal method for high-arsenic copper ore, and belongs to the technical field of mineral processing engineering. The method comprises the following steps: mixing crushed high-arsenic copper ore with additives, namely limestone and sodium hydroxide, and carrying out activation pretreatment through microwave cracking and quenching; a mixed solution of sodium sulfide and sodium hydroxide is adopted as a leaching agent for the pretreated mineral aggregate, and a first-stage ore grinding-leaching process, a second-stage ore grinding process, a synergistic enhanced oxidation process and a second-stage ore grinding-leaching process are sequentially carried out; and the first-stage leachate is returned to the first-stage ore grinding, the second-stage leachate is returned to the second-stage ore grinding, and finally the arsenic-removed high-copper slag is obtained. According to the method, the arsenic mineral structure is effectively destroyed through microwave pretreatment, efficient and selective removal of arsenic and cyclic utilization of the leaching agent are achieved in combination with the segmented enhanced leaching process, and the method has the advantages of being short in process, small in pollution and high in recovery rate.

This invention discloses a WS2 / WO2 composite material, its preparation method, and its application in sodium-sulfur batteries, belonging to the field of functional material preparation technology. The method includes: mixing cyclohexanol and oleic acid evenly to obtain a mixed solvent; adding tungsten hexachloride to the mixed solvent and stirring at room temperature until dissolved to obtain a precursor solution; subjecting the precursor solution to a hydrothermal reaction, washing, and drying to obtain W2 / WO2. 18 O 49 Powder; W 18 O 49 After the powder and sulfur source undergo a thermally controlled reaction under an inert atmosphere, a WS2 / WO2 composite material is obtained. This invention prepares a WS2 / WO2 composite material with a unique three-dimensional heterostructure through a simplified two-step method. By integrating the strong adsorption properties of WS2 and the high catalytic activity of WO2, and through interfacial coupling, the conversion of sodium polysulfides is synergistically accelerated. At the same time, its preparation process is significantly more complex than existing technologies, and can effectively suppress the shuttle effect, improve reaction kinetics, and enhance battery cycle stability.

The application relates to a preparation method and application of chiral two-dimensional cadmium sulfide nanosheets. The application aims to solve the problem that it is difficult to construct non-layered chiral two-dimensional inorganic nanomaterials. The method comprises the following steps: placing a first open reaction container and a second open reaction container in a sealable container, adding a cadmium acetate solution into the first open reaction container, then adding a left-rotational ibuprofen / chloroform solution drop by drop, adding a sodium sulfide aqueous solution into the second open reaction container, then adding a hydrochloric acid solution drop by drop, and finally sealing and standing. The application is used for preparing a circularly polarized light detection device for detecting left-rotational / right-rotational circularly polarized light. The application is used for the preparation and application of chiral two-dimensional cadmium sulfide nanosheets.

The invention relates to the technical field of mineral resource recycling and reusing, in particular to a beneficiation method for recycling bismuth resources from polymetallic ore concentrate tailings, which comprises the following steps: obtaining the polymetallic ore concentrate tailings containing bismuth and bismuthite inhibitor sodium sulfide; concentrating the tailings to discharge sodium sulfide, diluting, and then adding a reagent removal agent and a sulfur removal agent for activating treatment to finish the procedures of concentration reagent removal and surface de-intercalation; and roughing, concentration and scavenging are conducted, and bismuth concentrate is obtained. According to the beneficiation method, the surface of the bismuthite subjected to reagent removal treatment can be effectively repaired and optimized, so that the hydrophobic floatability of the bismuthite is recovered and enhanced; meanwhile, the accurate selection and dosage control of the gangue inhibitor ensure that other impurities are effectively inhibited while the bismuth is activated and floated, and the grade of bismuth concentrate is guaranteed.

The invention relates to a method for synchronously removing aluminum and arsenic from a tellurium electrolyte, which comprises the following steps: S1, adjusting the pH value of the tellurium electrolyte to be acidic to obtain an acidic tellurium electrolyte; s2, adding a precipitator into the acidic tellurium electrolyte, and carrying out precipitation reaction to obtain a mixed solution; the precipitator is a mixture of sodium sulfide and ferric salt; and S3, performing solid-liquid separation on the mixed solution to complete synchronous aluminum and arsenic removal of the tellurium electrolyte. According to the method, the aluminum and arsenic impurities in the tellurium electrolyte can be efficiently removed while the tellurium loss rate is low, especially the precipitant is added at the same time, the mutual promotion effect on synchronous aluminum and arsenic removal is achieved, the aluminum content in the electrolyte after impurity removal is lower than 0.01 mg / L, the arsenic content in the electrolyte after impurity removal is lower than 0.05 mg / L, and the purity and quality of tellurium are effectively improved.

The invention relates to the technical field of ITO (indium tin oxide) conductive glass recycling, and discloses a method for leaching and separating indium and tin in ITO conductive glass powder, which comprises the following steps: mixing the ITO conductive glass powder with a leaching agent solution to obtain leaching ore pulp; wherein the leaching agent solution is prepared from oxalic acid, a reagent A, a reagent B and water; the reagent A is oxalate, and the reagent B is one of sodium sulfide, ammonium sulfide and TAA; stirring and leaching the leached ore pulp, and filtering and separating after the leaching reaction is finished, so as to obtain leached residues and leached liquid; carrying out hydrolysis indium precipitation reaction on the leachate, and filtering after the reaction is finished to obtain indium precipitation filtrate and indium slag; the method has the advantages of being good in leaching selectivity, high in indium leaching speed, high in leaching rate and low in energy consumption in the leaching process, and the indium leaching rate of the method is far higher than that of traditional oxalic acid leaching.

The invention relates to the field of inorganic salts, and particularly discloses a production method of high-purity anhydrous sodium sulfide, which comprises the following steps: S1, dissolving industrial-grade sodium sulfate as a raw material to prepare a saturated sodium sulfate solution, and freezing and crystallizing to prepare sodium sulfate decahydrate crystals; s2, performing high-temperature rapid dehydration treatment on the sodium sulfate decahydrate crystal through rotary drying to prepare porous anhydrous sodium sulfate with the bulk density of 0.8-1.2 g / cm < 3 >; and S3, carrying out vacuum pressurization on the porous anhydrous sodium sulfate, and then carrying out a heating reduction reaction in a reducing gas atmosphere to prepare anhydrous sodium sulfide with the purity of more than or equal to 95%. The method has the characteristics that the problem that in the process of producing anhydrous sodium sulfide by reducing sodium sulfate through gas, sodium sulfate and anhydrous sodium sulfide generate a low-temperature co-melt to hinder subsequent reaction is solved, and high-purity anhydrous sodium sulfide is prepared.

The invention belongs to the technical field of solid waste resourceful treatment and catalytic materials, and particularly relates to a method for extracting zinc from lead-zinc smelting slag to prepare a zinc sulfide photocatalyst and application. Zinc extracted from lead-zinc smelting slag is used as a zinc source to prepare zinc sulfide, and the method specifically comprises the steps that the lead-zinc smelting slag is added into a sulfuric acid solution for acid leaching treatment, then sodium sulfide is added into obtained acid leaching supernate for a reaction to obtain zinc sulfide sediment, the sediment is collected, washed and dried, and then the zinc sulfide photocatalyst is obtained. The zinc sulfide prepared through the method serves as a catalyst to be applied to photocatalytic decomposition of water to prepare hydrogen, the photocatalytic hydrogen production performance of the zinc sulfide is greatly improved compared with zinc sulfide synthesized through drugs and commercial zinc sulfide, and a new way and direction are provided for resource utilization of the lead-zinc smelting slag.

The invention belongs to the technical field of fuel cells, and particularly relates to a foamed nickel and NiCo2S4 composite low-platinum catalyst as well as a preparation method and application thereof. The method comprises the following steps: 1) taking a certain amount of foamed nickel, a nickel salt, a cobalt salt, urea and water, magnetically stirring the mixture, performing a hydrothermal reaction, centrifuging after the reaction is completed, collecting a precipitate, and drying in a drying oven to prepare a NiCo2S4 precursor; 2) mixing the NiCo2S4 precursor with a sodium sulfide aqueous solution, and carrying out a hydrothermal reaction to prepare a compound of NiCo2S4 and foamed nickel; and 3) mixing the compound of NiCo2S4 and foamed nickel with potassium chloroplatinite and a reducing agent, and carrying out a reduction reaction to prepare the foamed nickel and NiCo2S4 composite low-platinum catalyst. The problem that an anode catalyst in a traditional methanol fuel cell is low in catalytic activity can be solved.

The application discloses a method for removing heavy metals in fly ash acidic leaching solution wastewater with hexavalent chromium as a trigger agent, which comprises the following steps: (1) adjusting the content of hexavalent chromium in the fly ash acidic leaching solution, and adjusting the pH to 3-6 to obtain treated wastewater; (2) pumping the treated wastewater into a fixed bed filled with sponge iron through a peristaltic pump, and further treating the effluent through sodium sulfide, then performing precipitation and filtration; introducing Cr(VI) into the acid leaching solution of medical waste incineration fly ash (FA), and revealing the space-time migration law of multiple target heavy metals (HMs) through an s-Fe0 packed bed column reactor; the results verify that most residual heavy metals can be efficiently removed, accompanied by the cooperative regeneration of passivated sponge iron; the research enriches the basic theory of ZVI packed bed reactor cooperative regeneration, and provides a novel, economical and sustainable strategy for the harmless treatment of fly ash leaching solution.

The invention discloses a method for preparing fluosilicic acid from yellow phosphorus slag, which comprises the following steps: drying the yellow phosphorus slag, pretreating, and carrying out acidolysis reaction on the pretreated yellow phosphorus slag; solid residues in reactants obtained after the reaction are removed, and filtrate containing fluosilicic acid is obtained; adding sodium sulfide into the obtained filtrate to purify and remove impurities, removing heavy metal ions, adjusting the pH value of the filtrate, and filtering again to obtain purified filtrate; and concentrating the purified filtrate under reduced pressure to separate out fluosilicic acid crystals or directly obtain a fluosilicic acid solution. According to the method disclosed by the invention, resource utilization of the yellow phosphorus slag is realized, accumulation of wastes is reduced, and pollution to the environment is reduced; by optimizing process conditions, the recovery rate of fluorine resources is increased, and the production cost is reduced; in addition, the method is simple in process and suitable for large-scale industrial production, has both technical feasibility and industrial application prospects, and provides important technical support for green transformation of the phosphorus chemical industry.

The invention relates to the technical field of comprehensive utilization of solid waste resources and catalysts, and provides a preparation method of a catalyst for extracting molybdenum, iron and zinc from copper smelting tailings. The method comprises the following steps: mixing silicon dioxide, sodium hydroxide and sodium sulfide according to a molar ratio of 1: (1.5-3): (0.8-2), then mixing with N, N-dimethylformamide according to a solid-to-liquid ratio of 1: (6-8), and carrying out solvothermal reaction at 180-220 DEG C under the oxygen pressure of 5-8 MPa for 3-5 hours; and cooling, filtering, washing and drying the reaction product, and calcining in a nitrogen atmosphere at 300-500 DEG C for 1.5-2.5 h to obtain the catalyst. According to the method, through regulation and control of carrier modification, sulfur source introduction and metal complexing, a sulfide active center is effectively formed, sulfur loss is inhibited, the obtained catalyst is used for copper smelting tailing treatment, molybdenum, iron and zinc can be efficiently extracted, the molybdenum leaching rate is larger than 90%, the zinc leaching rate is larger than 85%, the iron ore concentrate grade is larger than 55%, and the iron ore concentrate grade is larger than 55%. The method has the advantages of high metal recovery rate, environment-friendly process and good catalyst stability.