171results about How to "Low purity" patented technology

The invention provides a method for preparing high-purity and fine-particle-size lithium sulfide based on carbon thermal reduction. The method comprises the following steps: weighing lithium sulfate monohydrate, an insoluble inorganic carbon source and cysteine in a set proportion to form a raw material mixture; mixing the raw material mixture with water according to a set solid-to-liquid ratio, performing ultrasonic dispersion to obtain homogeneous dispersion liquid, and enabling the dispersion liquid to pass through a nitrogen circulating spray dryer to obtain uniform and dry precursor powder; in a vacuum environment, carrying out segmented calcination to obtain a crude product lithium sulfide; and in a dry and anhydrous environment, washing the crude product lithium sulfide for multiple times by using absolute ethyl alcohol according to a set liquid-solid ratio to obtain an alcoholic solution containing lithium sulfide, and then obtaining lithium sulfide fine powder through a nitrogen circulating spray dryer. The invention solves the problems of side reaction, low purity, large product particles, uncontrollable particle size and the like of lithium sulfide prepared by a carbon thermal reduction method in the prior art.

The invention discloses a preparation method and an application of an S and N co-doped small-nano-size high-entropy intermetallic compound. 2, 2 '-bithiophene is simultaneously used as a metal ligand and a sulfur source to be applied to synthesis of the high-entropy intermetallic compound, and sulfur atoms in the substance can form a complex with metal ions, so that a metal precursor can be uniformly and firmly distributed on the surface of a commercial carbon carrier, and formation of the high-entropy intermetallic compound in the subsequent annealing process is facilitated; the S and N co-doped high-entropy alloy intermetallic compound catalyst synthesized by the invention has excellent electrochemical performance in a fuel cell, and particularly has remarkable performance in the aspect of stability; wherein the mass activity of the S and N co-doped high-entropy alloy intermetallic compound PtCuNiCoFe / C-SN (PCNCF-SN) catalyst under the condition of 0.9 V (vs.RHE) reaches 2.7 A * mg <-1 > Pt, which is more than 12.3 times of that of commercial Pt / C; and in the aspect of stability, the mass activity can still be kept at 65% or above after 100000 circles of accelerated durability.

The invention discloses a distillation purification method for preparing a silane coupling agent, and belongs to the technical field of preparation of silane coupling agents. The distillation and purification method for preparing the silane coupling agent comprises the following steps: step 1, mixing a silane coupling agent crude product, tetrahydrofuran, an organic antioxidant and an auxiliary agent, heating, mixing and stirring to obtain a mixture; 2, adding the mixture into a distillation tower, heating and distilling, controlling the heating temperature and the distillation rate, and ensuring stable and continuous evaporation and condensation of the silane coupling agent; and 3, collecting the condensed liquid into a collector, separating the liquid, filtering, and drying to obtain the silane coupling agent. According to the method, the product purity and yield of the silane coupling agent can be effectively improved.

The invention relates to the technical field of cefuroxime sodium medicines, and in particular provides a method for recycling a cefuroxime sodium mother liquor. On the basis of the prior art, a mother liquor nanofiltration impurity removal step and an organic solvent permeation steam recovery step are added, and cefuroxime acid and organic solvents acetone, ethyl acetate and dichloromethane in the cefuroxime sodium mother liquor can be effectively recycled and utilized, which not only solves the heavy environmental burden for production enterprises, but also brings potential considerable economic benefits to the production enterprises, and has great economic value and social value.

The invention discloses organic silicon resin production equipment, and relates to the technical field of production. The device comprises a device body, a driving assembly is arranged at the top of the device body, a supporting assembly is arranged at the bottom of the device body, an electric telescopic rotating column is rotationally installed at the top of the inner wall of the device body, and an arc-shaped groove is formed in the outer wall of the electric telescopic rotating column; a filter plate is fixedly mounted on the outer wall of the telescopic end of the electric telescopic rotary column, and an anti-sticking device for avoiding non-uniform stirring of raw materials is arranged on the periphery of the electric telescopic rotary column. Through cooperation of an electric telescopic rotating column, a stirring block and a filter plate, the stirring block dynamically stirs raw materials, and the stirring effect is improved by turning over the center of the raw materials through the cambered surface treatment of the stirring block; and meanwhile, the filter plate moves dynamically to remove impurities in the raw materials, so that the removal effect on small-particle impurities is improved, and the purity and quality of the materials are guaranteed.

The invention discloses a purification method and a purification device for crystallized magnesium, and relates to the field of magnesium metal smelting. The method comprises the following steps: under the protection of an inert atmosphere, firstly carrying out pressure-applying melting treatment on a magnesium material to be smelted, and then carrying out pressure-applying filtering treatment on a product obtained after the melting treatment, so as to complete the flux-free smelting process of the magnesium material. And meanwhile, the metal magnesium liquid and most of the oxide shells are separated by utilizing the liquidity difference between the liquid metal magnesium and the solid oxide shells. Compared with a conventional smelting process without pressure application, the method has the advantages that the melting rate of the crystallized magnesium can be remarkably increased, most of oxide impurities are removed, a series of pollution problems caused by flux use are solved from the source, and low-cost, high-efficiency and high-quality smelting of the crystallized magnesium is realized.

The invention discloses a process for continuously producing chloroethane by using byproduct hydrogen chloride, which belongs to the field of chloroethane production, and comprises the following steps: (1) catalytic reaction: fully mixing hydrogen chloride and ethylene, and feeding the mixture into a reactor for reaction to generate a gas phase and a liquid phase; (2) multi-stage condensation: after the gas phase of the reactor is subjected to first-stage circulating water cooling condensation and second-stage refrigerant cooling, most of chloroethane is cooled to a crude product tank, and a small amount of residual chloroethane and hydrogen chloride enter the reactor through a compressor; and (3) recycling hydrogen chloride: a gas phase obtained by secondary condensation mainly comprises hydrogen chloride, and is recycled to the bottom of the reactor for continuous reaction after being pressurized by a compressor, the process flow is simple, the purity of chloroethane is high, the production consumption is low, and recycling and continuous production of chloroethane are realized.

The invention belongs to the technical field of anhydrous hydrogen fluoride production, and particularly relates to a feeding and conveying device for anhydrous hydrogen fluoride production. A discharging pipe is arranged at the bottom of the raw material box; the bottom of the raw material box is fixedly connected with a fixing frame; the end part of the discharging pipe is fixedly connected with a material conveying pipe; the end part of the material conveying pipe is fixedly connected with a motor; the output end of the motor penetrates through the end part of the conveying pipe; the output end of the motor is fixedly connected with a spiral blade; the spiral blade is mounted in the middle of the conveying pipe; a drying assembly, a screening assembly and an anti-blocking assembly are arranged in the middle of the raw material box; a cleaning assembly is mounted in the middle of the conveying pipe; a sealing assembly is mounted in the middle of the raw material box; by means of the structure, extra drying and screening treatment in the anhydrous hydrogen fluoride production raw material feeding and conveying process can be reduced, a large amount of energy consumption and time are effectively reduced, and therefore the problem that the production efficiency of anhydrous hydrogen fluoride is reduced in the whole production period is solved.

The invention belongs to the field of medicinal chemistry, and particularly relates to a 3, 8-dyhydroxyl-6H-benzo [c] chromene-6-ketone 8-site hydroxyl etherified derivative of a phosphodiesterase 2 inhibitor and application of the 3, 8-dyhydroxyl-6H-benzo [c] chromene-6-ketone 8-site hydroxyl etherified derivative. The 3, 8-dyhydroxyl-6H-benzo [c] chromene-6-ketone 8-position hydroxyl etherified derivative is shown in the specification. According to the invention, 2-bromo-5-hydroxy-benzoic acid is used as a raw material, and etherification, hydrolysis and cyclization are carried out to obtain a final product. The purposes of reducing the reaction time, improving the product purity and improving the reaction yield are achieved by improving the reaction temperature, adjusting the catalyst concentration and optimizing the purification method. Meanwhile, the compound obtained by the invention has good PDE2 inhibitory activity. # imgabs0 #

The invention relates to the technical field of silicon carbide production, in particular to a preparation method of high-purity silicon carbide powder. According to the preparation method of the high-purity silicon carbide powder, a silicon material is added into a carbon-containing solution, ball milling and drying are carried out, a first material is obtained, and the carbon material is selected from any one of corn starch and wheat starch; then putting the obtained first material into a tubular furnace and calcining in sections to obtain a second material; placing the second material in a reaction furnace, introducing a carbon source gas, and reacting to obtain a third material after the reaction is finished; and finally, washing the obtained third material with hydrofluoric acid and deionized water respectively, and drying to obtain the high-purity silicon carbide powder. The prepared high-purity silicon carbide powder is low in impurity content, high in purity and excellent in particle distribution, and the quality of the high-purity silicon carbide powder is effectively guaranteed.

The utility model provides a device and a rectifying tower for continuous rectification purification of sulphur, the device comprises a first preheater, a rectifying tower, a condenser and a vacuum unit, the first preheater is used for preheating crude liquid sulphur, the temperature of the crude liquid sulphur is preheated to 280-380 DEG C, the rectifying tower comprises a tower body, and the condenser is arranged in the tower body. The tower body sequentially comprises a tower top, a rectifying section, a stripping section and a tower kettle from top to bottom, preheated crude liquid sulfur enters the rectifying tower through a feeding hole, and the rectifying section is provided with a side line extraction hole; the condenser is communicated with the gas phase outlet to condense light components rich in gas sulfur, condensate rich in liquid sulfur obtained after condensation of the condenser enters the rectifying section through the reflux inlet, the cooling medium is 100-150 DEG C, and the condensate rich in liquid sulfur is output by the condenser; and the vacuum unit is used for providing a vacuum environment of-80 to-95 kpa for the rectifying tower.

The invention belongs to the field of preparation of high-purity quartz, and relates to a method for directionally removing impurity elements of pegmatite type high-purity quartz, which comprises the following steps: (1) crushing raw materials by a crusher, washing ore, grinding and grading, reselecting and floating to obtain quartz concentrate; (2) adding the quartz sand into the leachate A for constant-temperature micro-pressure leaching, and washing to obtain primary quartz sand; the leachate A is mixed acid of HF, HCl and HNO3, the concentration ratio of the HCl to the HNO3 is (3-12): 1, the concentration ratio of the HCl + HNO3 to the HF is smaller than or equal to 3, and the sum of the concentrations of the HCl, the HCl and the HNO3 is larger than or equal to 3 mol / L; (3) roasting and water quenching to obtain intermediate quartz sand; (4) adding the quartz sand into the leachate B for ultrasonic leaching, washing, and carrying out high-temperature heat treatment to obtain high-purity quartz sand; the leachate B is a mixed acid of HF and HCl, HF is 0.5-2 mol / L, and the concentration ratio of HCl to HF is less than or equal to 3. According to the method, the 4N8-grade high-purity quartz sand can be obtained, the yield is high, the process is simple, and operation is easy.

The invention belongs to the technical field of food processing, and particularly relates to an extraction process of turnip seed oil and an effective component composition of the turnip seed oil. The invention relates to an extraction process of turnip seed oil, which comprises the following steps: performing staged fermentation pretreatment on turnip seed broken cell walls by using a plurality of microbial strains, and then extracting grease by combining with a nano SiO2 (at) SDS composite active agent and ionic liquid synergistic ultrasonic treatment. Through staged fermentation pretreatment and the synergistic effect of the nano material and the ionic liquid, the extraction efficiency and quality of the turnip seed oil are greatly improved; firstly, cell walls and internal components are gradually degraded by utilizing aspergillus niger, aspergillus oryzae, bacillus licheniformis, lactic acid bacteria and saccharomycetes, grease is released, and the stability of the grease is improved; then, the extraction process is further optimized by a composite active agent formed by nano silicon dioxide and lauryl sodium sulfate and 1-butyl-3-methylimidazolium acetate, and the efficiency is enhanced through ultrasonic treatment;

The present disclosure relates to a low dielectric constant borate microwave dielectric ceramic and a preparation method thereof. The main raw materials of the low dielectric constant borate microwave dielectric ceramic are B2O3, SnO2 and SrCO3, and the chemical composition expression is SrSn(BO3)2. The preparation process of the low dielectric constant borate microwave dielectric ceramic provided by the embodiment of the present disclosure is simple, and the powder synthesized by the high temperature solid phase reaction method has a high purity. Compared with the existing microwave dielectric ceramic materials, the prepared low dielectric constant borate microwave dielectric ceramic has excellent performance, a lower dielectric constant, and a higher quality factor. The dielectric constant is 5.42 to 6.12, the temperature coefficient is ‑48.31ppm / °C to ‑53.37ppm / °C, and the quality factor is 22142GHz to 32618GHz.

The invention relates to a preparation and purification method and application of soybean oligopeptide, and belongs to the technical field of oligopeptide preparation. The preparation and purification method of the soybean oligopeptide comprises the following steps: preparing soybean seed coats and embryos, obtaining a peptide-containing solution from the seed coats by adopting a mode of firstly fermenting and then performing enzymolysis, obtaining a peptide-containing solution from the embryos by adopting a step-by-step enzymolysis mode, merging the peptide-containing solutions prepared from the seed coats and the embryos, and removing impurities by adopting an adsorbent to finally obtain the soybean oligopeptide with relatively high purity. The soybean oligopeptide obtained by the invention has better moisturizing performance, can play a role in protecting the skin, and resists the damage of light to the skin.

In this production method, a ligand compound capable of being coordinated with a metal ion and a first compound having an atomic group capable of a click reaction are reacted to obtain a product comprising a second compound having in the structure thereof a ligand and an atomic group capable of a click reaction. Thereafter, an eluting solution which includes a water-soluble organic acid having prescribed physical properties and does not include a trifluoroacetic acid is used to subject the product to liquid chromatography to obtain the second compound which has been purified. The present invention also provides: a method for storing the second compound; a composition including the second compound; and a method for producing a targeting agent using the second compound.

The invention relates to a preparation method of a superfine-particle-size NTC thermistor material, the material is a Ni-Cr-Fe-Mn-Co-O five-element system, NiO, Cr2O3, Fe2O3, MnO2 and CoO are selected as oxide raw materials, preliminary mixing and grinding treatment are performed, then drying and presintering are performed, secondary ball milling is performed to further refine powder particles, and the superfine-particle-size NTC thermistor material is obtained. The obtained thermistor powder has an ultrafine particle size (D50 is less than or equal to 1 [mu] m) and a high particle size distribution concentration ratio (D90-D10 is less than or equal to 2.04 [mu] m). The method provided by the invention has the characteristics of simple process, short preparation period, small material loss, wide raw material source, low cost and the like, and is easy to realize large-scale production. The NTC thermistor product prepared from the material prepared by the method disclosed by the invention has the advantages of high sensitivity, obvious negative temperature coefficient (B value is up to 4000 or above), and good thermal stability and consistency.

The invention provides a silicon nanowire and a preparation method and application thereof. The preparation method comprises the following steps: carrying out first evaporation on a silicon source to obtain silicon source steam, carrying out second evaporation on alloy ABx to obtain alloy steam, mixing the silicon source steam with the alloy steam, and reacting to obtain the silicon nanowire, wherein A is a reducing agent element and is selected from any one or a combination of at least two of Al, Mg or Zn, B is a catalyst element and is selected from any one or a combination of at least two of Au, Ag, Cu, Co, Ni, Fe, Ti, Nb, Sn, Al or Zn, and x is larger than or equal to 0.0001 and smaller than or equal to 3. The silicon nanowire is prepared in an alloy form, and the preparation process is simple and easy to control.

The utility model provides a precious metal forming device. The precious metal forming device comprises a closed cavity, a vacuum mechanism and a drainage rod, a first discharge hole is formed in the bottom end of the closed cavity; the closed cavity is connected with the vacuum mechanism in a sealing manner; one end of the drainage rod is arranged at the first discharge port, and the other end of the drainage rod is arranged on the cutting device. According to the precious metal forming device provided by the utility model, oxygen and other gases which are easy to generate oxidation-reduction reaction in the molten precious metal are removed under the vacuum condition, so that the oxidation reaction is avoided, and the influence on the subsequent processing of products is avoided.

Provided is a method for storing a fluorobutene by which decomposition is unlikely to proceed during storage. A fluorobutene represented by general formula C4HxFy where x is 0 or more and 7 or less, y is 1 or more and 8 or less, and x + y is 8 contains or does not contain at least one of manganese, cobalt, nickel, and silicon as a metal impurity. The fluorobutene is stored in a container in which the total concentration of manganese, cobalt, nickel, and silicon is 1,000 ppb by mass or less when containing at least one of manganese, cobalt, nickel, and silicon.

The invention relates to the technical field of calcium hydroxide preparation, and particularly discloses a preparation method of high-purity nano calcium hydroxide, which comprises the following steps: a digestion link, a crushing link and a dehydration link, by optimizing raw material selection and treatment flow and controlling the purity of calcium oxide, the problem of unstable purity possibly caused by external purchase of raw materials is avoided. Meanwhile, an efficient purification technology is adopted in the preparation process, impurities are further removed, it is ensured that the purity of the final product high-purity nano calcium hydroxide reaches the extremely high level, and the strict requirements of the high-end application field are met. The production cost is effectively reduced while the high quality of the product is kept.

The invention relates to a method for removing impurities formed by an electrochemical reaction from an electrolyte contained in a first vessel, said electrochemical reaction being an alkaline electrolysis. Said first vessel contains one or more catalysts. Said method comprises supplying power to said catalysts, thereby initiating said electrochemical reaction forming said sulfate-carbonate impurities. Furthermore, a liquid connection between said first and second vessel is established, wherein said second vessel contains a barium source. Thereby, a flow of said electrolyte from said first vessel to said barium source is established. Thereby, a barium suspension comprising a mixture of sulfate and carbonate is formed. Finally, said barium suspension is separated from said electrolyte, forming a purified electrolyte.

A PK polymerization solvent recovery system comprises a dehydrating tower, a heavy component removing tower and a solvent rectifying tower, an inlet is formed in the middle of the side wall of the dehydrating tower and connected with a crude solvent source, a tower top discharge port of the dehydrating tower flows back to the top of the dehydrating tower through a dehydrating tower condenser and a dehydrating tower return tank to discharge process water, and a bottom discharge port of the dehydrating tower supplies materials to the heavy component removing tower. A tower top discharge port of the heavy component removal tower is refluxed to the top of the heavy component removal tower through a heavy component removal tower condenser and a heavy component removal tower return tank, materials are supplied to the solvent rectifying tower, a tower top discharge port of the solvent rectifying tower is refluxed to the top of the solvent rectifying tower through a solvent rectifying tower condenser and a solvent rectifying tower return tank, and light components are discharged. And a tower bottom discharge port of the solvent rectifying tower is used for discharging the solvent. The device is simple in structure and convenient to operate, the solvent N-methyl pyrrolidone in the crude solvent and the residual catalyst palladium element can be effectively recycled, and the PK production cost is effectively reduced.

This invention discloses a resource recovery method for low-phosphorus ferric phosphate production wastewater, belonging to the technical field of ferric phosphate wastewater treatment and resource recovery. The method includes the following steps: reacting the low-phosphorus ferric phosphate production wastewater with an iron source solution in a first precipitation reaction to obtain hydroxyferric phosphate precipitate and a first filtrate; the pH of the first precipitation reaction is 0.8~1.8; reacting the first filtrate with a catalytic oxidant in a second precipitation reaction to obtain manganese dioxide precipitate and a second filtrate; the pH of the second precipitation reaction is 6.0~9.5, and the redox potential is -50 to 250 mV; subjecting the second filtrate to membrane concentration treatment to separate desalinated water and concentrated water; subjecting the concentrated water to a first evaporation crystallization to obtain evaporation crystallization mother liquor and ammonium sulfate crystals; and subjecting the evaporation crystallization mother liquor to cooling crystallization to obtain magnesium ammonium sulfate crystals and cooling crystallization mother liquor. This invention achieves efficient recovery of phosphorus, manganese, monophosphate, and magnesium from low-phosphorus ferric phosphate production wastewater, with high product purity.

The invention discloses a preparation method for preparing an all-vanadium electrolyte by taking ammonium polyvanadate as a raw material. The preparation method comprises the following steps: S1, crushing and grinding provided ammonium polyvanadate powder; s2, the ammonium polyvanadate powder is transferred into a vacuum metallurgical furnace to be calcined and decomposed; s3, crushing and grinding the produced blocky vanadium pentoxide; s4, hydrogen and nitrogen are prepared through liquid ammonia decomposition, and the vanadium pentoxide powder is reduced into vanadium dioxide (VO2) and vanadium trioxide (V2O3) powder in a hydrogen reduction furnace; s5, grinding the composite powder prepared in S4, and dissolving in a sulfuric acid solution; s6, determining the vanadium-containing mother liquor; and S7, the vanadium-containing mother liquor is used for the cathode, the sulfuric acid solution is used for the anode, and the vanadium-containing mother liquor and the sulfuric acid solution are electrolyzed and blended, so that the all-vanadium electrolyte with the valence state of + 3.5 is obtained. According to the invention, the high-purity ammonium polyvanadate is used as a raw material, so that the cost-effectiveness optimization is realized; environmental pollution is reduced through environment-friendly tail gas treatment and resource recycling; the one-step reduction technology simplifies the production steps and improves the product quality.

The invention discloses a method for preparing a Na2FePO4F / C material by using iron phosphate waste residue, which comprises the following steps: (1) carrying out oxidizing roasting pretreatment on the iron phosphate waste residue to obtain a roasted product; (2) mixing and reacting the roasted product with an acidic reducing agent to obtain a reaction product; (3) mixing and reacting the reaction product, a sodium source, a fluorine source, a carbon source, an iron source, a phosphorus source and an aluminum source, and drying the reaction product to obtain an intermediate product; and (4) carrying out reduction roasting on the intermediate product to obtain the Na2FePO4F / C. According to the invention, the doping modification effect of the aluminum impurities in the raw materials in the Na2FePO4F / C material is fully utilized, so that the cycle performance of the Na2FePO4F / C at high rate is effectively improved.

The invention discloses an extraction process of citrus essential oil and the citrus essential oil prepared through the extraction process, and belongs to the field of natural perfume extraction.The extraction process of the citrus essential oil comprises the following steps that S1, peel of disinfected and cleaned fresh citrus fruits is obtained; s2, sequentially crushing and squeezing the fruit peels under the assistance of ultrasonic waves or without ultrasonic waves, and then separating out solid matters to obtain virgin juice; and S3, standing and layering the virgin juice in an environment of 0-10 DEG C, then centrifuging at a controlled temperature at a centrifugal speed of 2000-60000r / min for 1-180min, and separating out upper-layer essential oil within 30min after centrifugation is finished, so as to obtain the citrus essential oil. The process can improve the essential oil yield, reduce the water content and maintain the natural fragrance close to that of fresh fruits, and can be applied to the field of food and the field of daily chemicals.

A method for preparing uridine 5'-diphosphate (UDP), its salt or its hydrate of the present invention, comprising the following steps: (step 1) deionizing the salt of uridine 5'-monophosphate (UMP) represented by chemical formula 2a with an acid, thereby preparing the UMP represented by chemical formula 2a; (step 2) reacting the UMP represented by chemical formula 2a with a tertiary amine, a carbodiimide condensing agent and imidazole, thereby preparing the uridine-5'-phosphoryl imidazole compound represented by chemical formula 2b; and (step 3) reacting the uridine-5'-phosphoryl imidazole compound represented by chemical formula 2b with a monophosphorylating agent and a tertiary amine, thereby preparing the UDP represented by chemical formula 3a, its salt or its hydrate. Therefore, the present invention can simplify the process by not using an ion exchange resin for deionization, and can be effectively used commercially by mass production with a relatively simple process without separate production equipment.

The invention belongs to the field of immunological detection, and provides an anti-human immunoglobulin lambda type light chain antibody 6B6 and application thereof. The monoclonal antibody 6B6 with good specificity and stability is obtained after fusion screening is conducted on natural human IgG and immune mice, the monoclonal antibody 6B6 can specifically recognize human immune globulin lambda type light chains, the antibody is verified through an immunoblotting method, and the antibody 6B6 shows good specificity and sensitivity. In addition, the human IgG-Fc is purified by using the antibody, and related reagents and kits for purifying the human IgG-Fc can be developed subsequently. The monoclonal antibody can also be used as a detection raw material for medical diagnosis, and has a good application prospect in detection of human immune globulin (especially a human immune globulin lambda type light chain).

A method for preparing nickel powder through electrolysis of nickel sulfate waste liquid in one step comprises the steps that the nickel sulfate waste liquid is diluted to a certain concentration by controlling the reduction degree of Ni < 2 + > under different cathode conditions, and different nickel electrolysis products are selectively prepared in the diluent; ti plated TaO2 / I rO2 alloy is used as an anode, a Ti sheet is used as a cathode, electrolysis is carried out under the conditions that the current density is 30-2000A / m < 2 >, the electrolyte temperature is 20-60 DEG C and the nickel ion concentration is 0.025-1.0 mo l / L, and nickel powder is obtained through electrodeposition on the cathode after electrolysis is finished; a circulating pump is used for recycling waste liquid; the electrolytic nickel powder prepared through the method is simple in required equipment, short in technological process, mild in condition, low in production cost, high in efficiency, environmentally friendly, suitable for one-step preparation of the nickel powder through the high-impurity nickel sulfate waste liquid and suitable for one-step preparation of the electrolytic nickel powder through the pure nickel sulfate solution. The method is especially suitable for environmental protection enterprises of nickel-containing waste liquid.