717 results about "Nickel sulphate" patented technology

The invention discloses a method for removing lead and supplementing nickel from electrodeposited nickel anolyte, which relates to the technical field of nickel wet smelting, is used for purifying and removing lead from anolyte of a pure sulfuric acid system, and comprises the following steps of: adding the electrodeposited anolyte into refined nickel sulfate oil-removed liquid and nickel carbonate slurrying liquid, introducing air, controlling the temperature, and entering an acid dissolution lead removal tank for acid dissolution; and filtering the acid-dissolved solution through an acid dissolution filter press, pumping the obtained primary filtrate into a precision filter, pumping the obtained secondary filtrate into a secondary filtrate storage tank, pumping the secondary filtrate into a catholyte tank through a secondary filtrate delivery pump, and enabling the obtained catholyte as an electrodeposition cell catholyte to enter an electrodeposition process. The method has the advantages of being short in technological process, high in lead removal efficiency, simple and convenient to use, easy to filter, low in energy consumption, capable of recycling the falling solution, convenient for industrial production and the like.

The present invention provides a method for preparing a high purity nickel sulfate solution comprising the steps of: i. providing an aqueous feed solution comprising nickel, cobalt, calcium and magnesium; ii. extracting cobalt, calcium and partially magnesium from said aqueous feed solution using a first solvent comprising a first alkyl phosphorus based acidic extractant, thereby obtaining an aqueous raffinate comprising nickel and magnesium; iii. extracting magnesium from said aqueous raffinate comprising nickel and magnesium using a second solvent comprising a second alkyl phosphorus based acidic extractant, thereby obtaining a high purity aqueous nickel sulfate solution comprising nickel and magnesium; and iv. stripping the first entraining solvent comprising cobalt, calcium and magnesium with an aqueous solution comprising a mineral acid.

The invention relates to the field of metal surface treatment, and discloses an efficient electroplating process for a cotton picker spindle and an electroplating liquid formula, the efficient electroplating process comprises the following steps: step 1, substrate pretreatment: sequentially carrying out alkali washing, acid washing and plasma activation on the spindle; step 2, preparing an electroplating solution: dissolving nickel sulfate, sodium hypophosphite, a composite nano additive and a complexing agent in water, and adjusting the pH value to 4.8-5.3; step 3, gradient pulse electroplating: carrying out pulse electroplating in three stages, including bottom layer deposition, transition layer deposition and composite layer deposition; 4, post-treatment is conducted, specifically, silane sealing and curing are conducted on the plating layer; the base body pretreatment in the first step comprises the following sub-steps of alkali washing and oil removal, wherein the picking ingot is soaked in a NaOH solution with the concentration being 45-55 g / L. According to the method, high-density hydroxyl active sites are constructed on the surface of the metal base material through a plasma activation process, strong chemical bonding is formed between a plating layer and the base material, and the interface bonding strength is remarkably improved.

The invention provides a copper-nickel alloy catalytic electrode and a preparation method and application thereof. The copper-nickel alloy catalytic electrode comprises a foamed nickel substrate and a copper-nickel alloy vertically loaded on the surface of the foamed nickel substrate, the molecular formula of the copper-nickel alloy is Cu < 0.81 > Ni < 0.19 >, and the copper-nickel alloy is of a dendritic nanostructure. The preparation method comprises the following steps: adding copper sulfate, nickel sulfate and ammonium sulfate into water, and uniformly stirring to obtain an electrolyte; taking a foamed nickel substrate as a working electrode, taking a saturated silver-silver chloride electrode as a reference electrode, taking a platinum sheet or a graphite rod electrode as a counter electrode, and applying constant current density to the working electrode to obtain a preset electrode; and alternately cleaning the preset electrode by using ethanol and distilled water, and carrying out vacuum drying to obtain the copper-nickel alloy catalytic electrode. According to the prepared copper-nickel alloy catalytic electrode, the copper-nickel alloy is in a dendritic morphology, has abundant active sites and a high specific surface area, and has excellent catalytic activity and stability in hydrogen preparation by coupling hydrogen evolution reaction for synthesizing adipic acid through electro-catalysis of cyclohexanone.

The invention provides a treatment method of a nickel sulfate solution, and relates to the technical field of non-ferrous metal smelting. The treatment method of the nickel sulfate solution comprises a neutralization procedure, an extraction and oil removal procedure, an electrodeposition procedure and a nickel deposition procedure, in the neutralization procedure, a nickel deposition material generated by anolyte deposition in the nickel deposition procedure serves as a neutralizer to adjust the pH value back, and the solution obtained after neutralization and impurity removal is subjected to extraction, oil removal and electrodeposition to obtain anolyte. And continuously precipitating the anolyte to obtain a nickel precipitation material. The first solid produced by the treatment method of the nickel sulfate solution can be used for pyrogenic production of high matte nickel and electrodeposition procedures, part of impurities in raw materials can be discharged out of a system through the first solid, no dangerous waste residue is produced, and therefore the number of needed filter presses, the number of solid residue filter pressing times and the residue discharging workload are reduced. As calcium powder is not used for neutralization in the neutralization process, the problem of pipeline blockage caused by precipitation of saturated calcium is reduced.

The invention provides a chemical nickel-plating solution based on microcapsules and a method for preparing a coating. The chemical nickel-plating solution based on the microcapsules comprises the following components: 20-30g / L of nickel sulfate hexahydrate; 15-20 g / L of sodium hypophosphite; 10 to 15g / L of trisodium citrate; 2-5 g / L of microcapsules; 10-15 g / L of a stabilizer; the pH regulator is used for regulating the pH value to 4.5 to 5.0; and the balance of deionized water. According to the invention, the microcapsules containing the same components as the chemical nickel plating solution are introduced, so that the automatic repairing function of the coating after being damaged is realized. The coating has high mechanical strength and excellent self-repairing characteristic, and is suitable for surface protection of industrial equipment needing long service life and corrosion resistance.

The invention provides a purification and impurity removal method of a crude nickel-cobalt-manganese sulfate solution. The purification and impurity removal method comprises the following steps: (1) adding sodium thiosulfate into the crude nickel-cobalt-manganese sulfate solution to remove copper; (2) phosphate is adopted, the pH value is regulated, and titanium, iron, aluminum and the like are removed; (3) ferric sulfate is added, the pH value is regulated, and phosphorus and silicon are removed; (4) adding a bismuth agent and regulating the pH value to remove chlorine; (5) adding a fluorine agent to remove calcium and magnesium; and (6) adding a tillite mineral adsorbent to remove fluorine. According to the method, iron, aluminum, copper, fluorine, phosphorus, titanium, calcium, magnesium, chlorine, silicon and other elements can be efficiently removed from the rough nickel-cobalt-manganese sulfate solution, the loss of main metal is low, the prepared high-purity nickel-cobalt-manganese sulfate solution can directly meet the requirement of a precursor solution of a battery preparation level, the process is simple, the operation difficulty is low, industrial large-scale production is easy to achieve, and the method is suitable for industrial production. And the defects of the current preparation method of the high-purity nickel-cobalt-manganese sulfate solution are overcome.

The invention discloses a method for controlling ion concentration and volume balance in an electrolyte by using nickel hydroxide. The method comprises the following steps: preparing a reaction base solution containing a first complexing agent and a first alkali; the first anolyte, a second complexing agent solution and a second alkali solution are simultaneously added to the bottom of the reaction base solution for stirring reaction, solid-liquid separation is performed after nickel hydroxide reaches the target particle size, and filtrate and a filter cake are obtained; washing the filter cake, and slurrying the filter cake by using a second anolyte to obtain a nickel hydroxide slurrying material; and adjusting the sodium ion concentration, pH and nickel ion concentration of the third anolyte by adopting a sodium hydroxide solution, a nickel hydroxide slurrying material and a nickel sulfate solution to obtain the catholyte. According to the invention, a feeding mode of feeding at the bottom is adopted, and a complexing agent is matched, so that crystals can stably grow and are convenient to filter; in the preparation process, aging and too high pH conditions are not needed, operation is simpler, labor intensity is small, the reaction rate is higher, and continuous treatment of the anolyte can be achieved.

The invention relates to the technical field of hazardous waste utilization, in particular to a comprehensive utilization method of a waste catalyst. The method specifically comprises the following steps: sequentially carrying out oxidizing roasting, wet ball milling and pressure leaching on the waste catalyst to obtain a first leaching solution and leaching residues; the first leachate is extracted in a multi-stage counter-current extraction mode, molybdenum and tungsten in the first leachate are extracted, and back extraction is conducted to obtain back extraction liquid containing molybdenum and tungsten; the strip liquor is subjected to standing deoiling, evaporation concentration and multi-stage counter-current extraction vanadium removal in sequence, and raffinate and vanadium-containing strip liquor are obtained; the raffinate mainly contains molybdate radicals and tungstate radicals; determining a separation mode according to different molar ratios of molybdenum and tungsten; carrying out acid leaching on the leaching residues by utilizing a sulfuric acid solution at normal temperature and normal pressure to obtain a second leaching solution; and a cobalt extraction agent and a nickel extraction agent are respectively used for extraction, and a cobalt sulfate product and a nickel sulfate product are obtained after reverse extraction and evaporative crystallization. According to the method provided by the invention, metal resources such as vanadium, tungsten, cobalt, molybdenum and nickel in the waste catalyst can be recycled.

The invention belongs to the technical field of ceramic materials, and particularly relates to a high-strength building ceramic material and a preparation method thereof. The high-strength building ceramic material is prepared from the following raw materials in parts by weight: 20 to 30 parts of potassium feldspar, 15 to 23 parts of kaolin, 37 to 45 parts of solid waste-based silicon carbide, 1 to 4 parts of talc, 3 to 8 parts of modified mullite whisker and 2 to 5 parts of filler, a preparation process of the modified mullite crystal whiskers comprises the following steps: (1) adding mullite crystal whiskers into an ethanol water solution containing a silane coupling agent, and heating for reaction to obtain pretreated mullite crystal whiskers; and (2) adding the mullite whiskers pretreated in the step (1) into a nickel sulfate aqueous solution, then adding triethylamine and sodium thiosulfate, and carrying out a heating reaction to obtain the modified mullite whiskers. After the raw material components are combined, preparation of a high-strength ceramic material is facilitated, the heat conductivity coefficient can be increased, the heat conduction effect can be enhanced, and the ceramic material is suitable for common home decoration and high-heat-conductivity floor heating ceramic tiles.

The invention discloses a method for recovering and separating nickel, cobalt and manganese from waste ternary lithium ion battery material lithium extraction slag, which comprises the following steps: pulping waste ternary battery material lithium extraction slag, leaching, introducing compressed air as an oxidant, and carrying out solid-liquid separation after leaching to obtain a leachate and leaching slag; sequentially performing copper removal, iron removal, aluminum removal and fluorine removal on the leachate to finally obtain fluorine-removed liquid; carrying out refined filtration on the fluorine-removed liquid to obtain a refined-filtered liquid; adjusting the pH value of the finely filtered liquid, and extracting impurities by using nickel soap P204 to obtain a rich organic phase and raffinate 1; extracting manganese from the raffinate 1 by using nickel soap P204 to obtain a manganese-rich organic phase and raffinate 2; extracting cobalt from the raffinate 2 by using nickel soap P507 to obtain a cobalt-rich organic phase and raffinate 3; and carrying out evaporative crystallization on the raffinate 3 to obtain nickel sulfate. The whole process has the advantages of short flow, high metal recovery rate, high product quality and low sodium-containing wastewater treatment capacity, and nickel, cobalt, manganese and lithium elements in the waste ternary lithium ion battery material are efficiently recycled by combining a front-end lithium extraction and recovery process, so that resource circulation is realized.

The invention discloses a preparation method of a zinc-nickel alloy coating. A formula of a plating solution comprises zinc chloride, nickel sulfate hexahydrate, sodium hydroxide, sodium potassium tartrate tetrahydrate, trisodium citrate, potassium citrate, triethanolamine, tetraethylenepentamine, a primary brightener and a secondary brightener. A double-acid compound complexing agent is used for replacing a traditional single-acid complexing agent, and a plating layer can have a finer crystal structure by compounding a basic plating solution to electroplate a zinc-nickel alloy, so that the plating layer with more excellent corrosion resistance is obtained; the stability of metal ions in an electroplating solution is improved, the conductivity and uniformity of the electroplating solution are improved, the quality of a plating layer can be remarkably improved, the corrosion resistance and hardness of the plating layer are improved, pores in the plating layer are reduced, and the protection capability on a matrix is enhanced.

The invention discloses a vacuum diffusion bonding method for a nickel-based superalloy and MoNbTaW series refractory alloy, and aims to solve the problem that the quality of a welding joint is affected due to the fact that the welding joint of the nickel-based superalloy and the MoNbTaW series refractory alloy can generate a Cr-rich brittle phase. The vacuum diffusion method comprises the following steps: 1, polishing the nickel-based high-temperature alloy and the MoNbTaW series refractory alloy; secondly, nickel sulfate, nickel chloride, nickel borate, sulfuric acid, lauryl sodium sulfate and water are mixed, an electroplating solution is obtained, the nickel-based superalloy is electroplated, an electroplated nickel grain layer is obtained, and the MoNbTaW series refractory alloy and the nickel-based superalloy are jointed; thirdly, the to-be-welded part is placed in a vacuum diffusion furnace; and 4, performing vacuum diffusion bonding. According to the method, the electronickelling grain layer is used, connection is conducted at the relatively low temperature and the relatively low pressure, only interdiffusion of the electronickelling grain layer and refractory alloy in a small range exists on a connector interface, a Cr-rich brittle phase is not generated, and cracks are prevented from being generated in the connector.

The invention provides a chemical plating solution, a preparation method of the chemical plating solution, a Ni-P-Gr chemical plating layer and a preparation method and application of the Ni-P-Gr chemical plating layer, and relates to the technical field of chemical plating. The preparation method comprises the following steps: adjusting the pH value of nickel sulfate, sodium citrate, sodium acetate, sodium hypophosphite and graphene oxide to 4-4.5, mixing with sodium dodecyl benzene sulfonate, homogenizing, and ultrasonically dispersing to obtain the chemical plating solution. Homogenization treatment and ultrasonic dispersion are used in the process of preparing the chemical plating solution, the addition amount of the graphene oxide is controlled to be 0.1-0.4 g / L, and the ultrasonic dispersion conditions are 100-180 W and 35-55 min, so that the graphene oxide in the prepared chemical plating solution is good in dispersion uniformity, and the chemical plating solution is uniform in dispersion. The graphene oxide in a Ni-P-Gr chemical plating layer formed by adopting the chemical plating solution prepared by the invention is good in dispersity, and the Ni-P-Gr chemical plating layer is high in hardness, good in wear resistance and strong in binding force with a matrix.

The invention relates to the technical field of stainless steel bands, and particularly discloses a wear-resistant duplex stainless steel band and a processing technology thereof. The method specifically comprises the following steps that S1, the surface of a duplex stainless steel band is electroplated with an iron-nickel-copper layer, and a stainless steel band A is obtained; the plating solution comprises the following components: 40-50 g / L of nickel sulfate hexahydrate, 20-30 g / L of ferric sulfate, 30-40 g / L of copper sulfate pentahydrate, 35-45 g / L of sodium citrate dehydrate, 25-30 g / L of sodium acetate and 20-25 g / L of sodium hypophosphite; s2, uniformly mixing organic silicon resin, hydrogen-containing silicone oil, ethanol, nano silicon carbide and a corrosion-resistant antibacterial agent to obtain a corrosion-resistant antibacterial coating; s3, the surface of the stainless steel band A is coated with the corrosion-resistant antibacterial coating, drying is conducted at the room temperature, and a stainless steel band B with a corrosion-resistant antibacterial coating on the surface is obtained; and coating gallium-containing zinc oxide sol on the surface of the stainless steel band B, and carrying out heat treatment to obtain the wear-resistant duplex stainless steel band with a gallium-containing zinc oxide layer on the surface.

The invention belongs to the technical field of waste battery recovery and regeneration, and particularly relates to a method for recovering valuable metal from a waste lithium battery positive electrode material. The method comprises the following steps: carrying out sulfuration roasting on waste positive electrode powder, selectively extracting lithium in a water leaching manner, and precipitating lithium to obtain lithium carbonate; separating and purifying the nickel, the cobalt and the manganese through microwave acid leaching, precipitation impurity removal and step-by-step extraction to obtain extract liquor of the nickel, the cobalt and the manganese, and performing reverse extraction on the extract liquor to obtain battery-grade cobalt sulfate, battery-grade nickel sulfate and battery-grade manganese sulfate. According to the method, lithium is extracted firstly, the influence of the lithium element on subsequent nickel-cobalt-manganese extraction is reduced, meanwhile, the recovery rate of lithium is increased through the water leaching method, and the recovery cost is reduced. According to the method, precipitation and impurity removal are performed before nickel-cobalt-manganese extraction, so that the content of impurities in a sulfate solution is reduced, and the recovery rate of nickel, cobalt and manganese is greatly improved.

According to the method for preparing the nanocrystalline nickel foil through the electro-deposition method and the nanocrystalline nickel foil prepared through the method, a nickel plate serves as an anode, a titanium plate serves as a cathode, the anode and the cathode are both placed in electrolyte, and the nanocrystalline nickel foil is prepared on the titanium plate through electro-deposition by adopting a pulse power source; the electrolyte comprises water and the following components by concentration: 300-500g / L of nickel sulfate; 5-15 g / L of nickel chloride; 0.01 to 0.2 g / L of a wetting agent; 20-60 g / L of a buffer agent; 0.05-2 g / L of a brightener; the pH value of the electrolyte is 2-4, and the electro-deposition temperature is 40-60 DEG C; the buffering agent is selected from one or two of citric acid and sodium citrate; and the brightener is selected from one or more of butynediol propoxide, butynediol ethoxylate, sodium sulfopropyne ether, propynol ethoxylate and glycerol monopropyne ether. Based on the method, the problem that in the prior art, the nickel foil prepared through an electro-deposition method is large in fine grain size is solved.

The invention relates to a method for recycling battery-grade nickel sulfate from nickel-containing industrial waste, and belongs to the technical field of nonferrous metallurgy. The method comprises the steps that the nickel-containing industrial waste is subjected to water leaching treatment, and nickel-containing leachate is obtained; carrying out gradient pH regulation and control on the nickel-containing leaching solution by adopting calcium carbonate to obtain a purified solution; carrying out first countercurrent extraction on the purified liquid by adopting an organic phase I with the D2EHPA concentration of 0.1-0.3 mol / L; carrying out second counter-current extraction on the raffinate I obtained in the step (3) by adopting an organic phase II with the CYANEX 272 concentration of 0.05-0.2 mol / L; the raffinate II obtained in the step (4) is subjected to adsorption and oil removal through activated carbon and then is subjected to evaporative crystallization, and nickel sulfate crystals and crystallization mother liquor are obtained. The method is high in nickel recovery rate, the purity of nickel sulfate is larger than or equal to 99.9%, and the sodium content is low.

The invention relates to an agglomerated ceramic abrasive which is prepared from the following raw materials in percentage by weight: 25-30% of a ceramic bond, 65-70% of diamond micro-powder, 1-3% of titanium powder, 2.5-5% of nitrate, 0.3-0.5% of nickel sulfate and 1-3% of aluminum zirconate, and is prepared by the following steps: adding water into the raw materials, uniformly mixing, and grinding; and then carrying out spray granulation, impurity drying and sintering to obtain the agglomerated ceramic abrasive material. Compared with a common ceramic bond diamond agglomerated abrasive material, the agglomerated ceramic abrasive material prepared by the method has the advantages of high hardness, uniform particle distribution, good grinding performance and the like. When the agglomerated ceramic abrasive is used for polishing marble tiles, no obvious scratches appear on the surfaces of the tiles, the surface consistency is good, and the polishing efficiency of the marble tiles is high.

The invention particularly discloses a battery steel shell electroplating process. A battery steel shell electroplating process comprises the following steps that S1, a steel shell is subjected to pre-cleaning treatment; s2, the pre-cleaned steel shell is placed in a primary electroplating solution to be subjected to primary electroplating operation; the primary electroplating solution comprises 280-300 g / L of nickel sulfate; the electroplating temperature in the primary electroplating operation is 40-45 DEG C, the current density is 40-60 mA / cm < 2 >, and the nickel-plated steel shell is obtained after the primary electroplating operation is finished; s3, the nickel-plated steel shell is placed in a secondary electroplating solution to be subjected to secondary electroplating operation; the electroplating temperature in the secondary electroplating operation is 50-55 DEG C, the current density is 25-40 mA / cm < 2 >, a nickel / titanium composite layer is formed on the surface of the nickel-plated steel shell, and the battery steel shell is obtained; wherein the secondary electroplating liquid is obtained by mixing the electroplating liquid obtained after the primary electroplating operation is finished with an additive; the additive comprises nano titanium dioxide. The method has the advantage of improving the binding force, corrosion resistance and wear resistance of the coating on the surface of the steel shell.

The utility model relates to the field of hydrometallurgy, in particular to a nickel sulfate solution deoiling device. Comprising a standing tank connected with a production process outlet end, one end of an oil removal device is connected with the standing tank, the other end of the oil removal device is connected with a resin adsorption column, the resin adsorption column is connected with a regeneration tank, and the regeneration tank is connected with a solution storage tank. According to the oil removal device arranged in the device, oil can be treated step by step according to different existing forms and physical properties of oil in nickel sulfate through internal fiber cotton filtration, resin adsorption and filter screen filtration, and compared with the prior art, the oil removal effect is better; the device is provided with the oil-water separator and the bag filter, so that the oil removal effect can be further improved, and impurities in the nickel sulfate solution can be separated.

The invention discloses a salt-spray-corrosion-resistant stainless steel rod and a preparation method thereof, and belongs to the technical field of salt-spray-corrosion-resistant stainless steel. The salt-spray-corrosion-resistant stainless steel rod comprises a stainless steel rod body and a corrosion-resistant layer attached to the outer surface of the stainless steel rod body. The method comprises the following steps: sequentially polishing, deoiling, activating and cleaning a stainless steel rod, then putting the stainless steel rod into a chemical composite plating solution for chemical composite plating, then putting the stainless steel rod into a nitric acid solution for chemical etching, introducing hydrogen and hydrocarbon gas in a high-temperature atmosphere, and then continuously heating and introducing composite hydrogen to obtain the salt-spray-corrosion-resistant stainless steel rod, wherein the chemical composite plating solution comprises the following components: 30-40 g / L of nickel sulfate, 15-35 g / L of sodium hypophosphite, 4-6 g / L of citric acid, 32-36 g / L of boric acid, 16-20 g / L of sodium acetate, 0.03-0.05 g / L of carbon black and 20-35 g / L of tungsten carbide particles; the salt-spray-corrosion-resistant stainless steel rod prepared by the invention is relatively good in corrosion resistance, wear resistance and toughness.

The invention relates to the field of recycling of lithium ion batteries, and discloses a method for recycling valuable metals in a failed lithium battery. The method comprises the following steps: (1) carrying out reaction on the nickel-cobalt-manganese slag and concentrated sulfuric acid, carrying out water leaching on the obtained slurry, and carrying out solid-liquid separation to obtain a cobalt-manganese leaching solution and nickel slag; (2) extracting the cobalt-manganese leachate, carrying out reverse extraction on the obtained organic phase to obtain a manganese sulfate solution, and then carrying out evaporative crystallization to obtain manganese sulfate; the extracted raffinate is subjected to evaporative crystallization, and cobaltous sulfate is obtained; and (3) the nickel slag obtained in the step (1), an acid solution and hydrogen peroxide are subjected to a catalytic oxidation reaction, an obtained nickel sulfate solution is subjected to electro-deposition treatment, and nickel is obtained. According to the method, the recovery rate and purity of the valuable metal are improved, the recovery process of the valuable metal of the lithium battery is simplified, the whole process is environmentally friendly, near-zero discharge of wastewater is achieved, and the investment cost is low.

The invention discloses a method for preparing battery-grade nickel sulfate through collaborative purification of crude nickel sulfate and crude nickel carbonate. According to the method, crude nickel sulfate is dissolved firstly, then crude nickel carbonate is utilized for batch synergistic neutralization, and the alkalinity of the nickel carbonate is effectively utilized to reduce extra acid and alkali consumption. And then through multi-stage fine purification, including Fe oxidation and preliminary precipitation, Cr (VI) reduction and high-pH precipitation, main impurities such as iron, chromium, aluminum and the like are efficiently removed. And after the mother liquor is adsorbed by activated carbon and trace impurities are removed by strong-acid cation exchange resin, vacuum evaporation and concentration are carried out, and seed crystals are introduced for cooling crystallization, so that pure NiSO4. 6H2O crystals are obtained. The whole technological process pays attention to resource recycling, washing water recycling and nickel recycling of nickel-containing filter residues, waste gas and waste liquid are treated, and clean production is achieved. The nickel sulfate product prepared by the method is high in purity, meets the battery grade standard, and has good economic benefits and environmental benefits.

The application provides a weathering steel surface rust layer stabilizing treatment agent for industrial atmospheric environment, and the chemical composition of the weathering steel surface rust layer stabilizing treatment agent is as follows in terms of mass fraction: 25-45% of acrylic resin, 2.0-6.0% of chromium sulfate, 3.0-8.0% of ferrous oxide, 2.0-6.0% of ferric oxide, 0.5-3.5% of copper sulfate, 0.3-1.5% of sodium bisulfite, 1.0-6.0% of sodium molybdate, 0.5-3.5% of nickel sulfate, 2.0-5.0% of potassium phosphate, 0.05-0.5% of surfactant, 0.05-0.5% of defoaming agent, 0.05-0.5% of dispersing agent, 0.05-0.5% of thickening agent, and the balance is water, wherein the amount of plasticizer added is 2-5% of the resin. The stabilizing treatment agent in the application can promote the weathering steel surface to form a stable and dense rust layer within 0.5-1 year after the surface of the weathering steel is treated before use.

The invention relates to an efficient separation and comprehensive recovery method based on copper-nickel complex platinum-palladium concentrate. The efficient separation and comprehensive recovery method comprises the following steps: (1) smelting and enriching; (2) carrying out two-stage cascade blowing enrichment; (3) stage selective crystallization; (4) separating mixed ore; (5) selective separation of alloyed gold; (6) separating copper-nickel bulk concentrate; and (7) mixing the nickel sulfate crystal obtained in the step (5) and the nickel oxide obtained in the step (6), feeding the mixture into a reverberatory furnace, smelting to obtain a nickel anode plate with crude nickel as a main component, and then feeding the nickel anode plate into an electrolysis process for electrolysis to obtain cathode nickel, anode mud and silver-cobalt slag products. According to the method, valuable metals such as platinum, palladium, gold, silver, copper, nickel and cobalt in the complex platinum-palladium concentrate can be efficiently separated and recovered, the separation effect is good, the comprehensive recovery rate is high, comprehensive recycling of resources is fully achieved, the problems that an existing recovery process is poor in recovery effect and high in cost are solved, and good economic benefits and social benefits are achieved.

The invention relates to the field of hydrometallurgy, in particular to a method for preparing nickel sulfate from nickel raw material leachate. The trend of the washing liquid in the traditional process is changed in the technological process, so that the amount of the washing liquid entering the nickel sulfate solution is reduced, the concentration of nickel ions in the nickel sulfate solution before evaporation is improved, and the unit cost of evaporative crystallization of nickel sulfate is reduced. P507 cobalt extraction washing liquid enters a P204 impurity extraction and soap conversion section, P507 magnesium extraction washing liquid enters a P507 cobalt extraction and soap conversion section and / or the P204 impurity extraction and soap conversion section, Cy272 magnesium extraction washing liquid enters a P507 magnesium extraction and soap conversion section, the P507 cobalt extraction and soap conversion section and / or the P204 impurity extraction and soap conversion section, and the washing liquid is transferred to the previous procedure and enters the soap conversion section instead of entering an extraction system; washing liquid is discharged out of the system in the form of sodium sulfate wastewater, so that the water phase amount of the system is reduced, and the nickel ion concentration in the nickel sulfate solution is improved.

The utility model discloses a nickel sulfate purification device. The nickel sulfate purification device comprises a purification tank, the top cover is arranged at the top of the purification tank; the stirring assembly is arranged in the top cover; the stirring assembly comprises a motor, a rotating rod and a stirring frame; the top of the top cover is fixedly connected with a motor; an output shaft of the motor is fixedly connected with a rotating rod through a coupling; the outer wall of the rotating rod is fixedly connected with a stirring frame; the filler assembly is arranged at the top of the top cover; the packing assembly comprises a fixing groove, a fixing pipe, a nozzle, a threaded sleeve, a self-locking screw, a piston and an adjusting disc. According to the nickel sulfate purification device, the motor is mounted on the top cover, so that the motor can drive the rotating rod to rotate, the rotating rod can drive the stirring frames on the two sides to rotate, the multiple stirring frames can effectively and uniformly mix materials in the purification tank, the mixing efficiency of various materials can be improved, and the practicability of the nickel sulfate purification device is improved. The practicability of the purification device is improved.

The invention discloses an activation-free porous nickel catalytic electrode material and a preparation method and application thereof, and belongs to the technical field of electrocatalysis, the preparation method comprises the following steps: dispersing a pore-forming agent in a nickel sulfate solution, and reacting to obtain nickel-coated pore-forming agent composite powder; spraying the nickel-coated pore-forming agent composite powder serving as an electrode coating onto a nickel net base material to obtain a composite electrode; carrying out roasting treatment on the composite electrode so as to burn out the pore forming agent in the electrode coating; and putting the roasted composite electrode into a reduction solution, and reacting to obtain the activation-free porous nickel catalytic electrode material. The method effectively avoids the problem of waste alkali liquor treatment in the preparation process, is more environment-friendly and lower in cost, and also avoids the problems of diaphragm blockage and voltage rise caused by dissolution of residual metal aluminum after long-term operation. A developed pore structure is constructed in the nickel electrode coating through heat treatment and liquid phase reduction, the electrode has high porosity and rich active sites, and transfer of electrons and mass transfer of electrolyte are effectively enhanced.

The invention discloses a recycling method of NF3 residual electrolysis liquid, and relates to the technical field of residual electrolysis liquid recycling treatment. The method comprises the following steps: step 1, removing Fe ions in the electrolytic residual liquid: firstly, adding hydrogen peroxide or oxygen into the electrolytic residual liquid for reaction, oxidizing ferrous ions into ferric ions, then adding ammonia water and sodium hydroxide or ammonium bicarbonate and sodium hydroxide into the solution for reaction, precipitating ferric ions in the form of ferric hydroxide; 2, hydrofluoric acid is added into the electrolyte solution obtained after iron removal to adjust the pH of filtrate to 3-12, the filtrate enters an extraction system, the nickel element in ammonium hydrogen fluoride is extracted out, and ammonium hydrogen fluoride is purified; and step 3, the nickel element separated from the electrolyte enters a second section to be extracted and synthesized into a nickel sulfate product.