424 results about "Nickel sulphate" patented technology

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 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 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.

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 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 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.

The invention discloses a method for removing arsenic and antimony from a nickel sulfate solution, which is characterized in that an overflow kettle group formed by a plurality of overflow kettles connected in series is used for removing arsenic and antimony from the nickel sulfate solution, so that the arsenic and antimony removal of the nickel sulfate solution is continuous production, and the content of arsenic and antimony elements in the solution subjected to arsenic and antimony removal only needs 3-4 hours to be analyzed in the production process; when the first-stage overflow kettle completely reacts, an open circuit can be formed, and the second-stage overflow kettle becomes a new first-stage overflow kettle; carrying out filter pressing on the solution in the open-circuit first-stage overflow kettle, collecting the nickel sulfate solution without arsenic and antimony, and adding the nickel sulfate solution without arsenic and antimony into a new first-stage overflow kettle to continuously participate in the reaction; adding filter residues generated by filter pressing into a slurrying tank for slurrying; according to the process disclosed by the invention, arsenic and antimony elements in the nickel sulfate solution can be removed while the nickel sulfate solution is collected by filter pressing, so that the production efficiency is greatly improved. The filter residues are recycled, so that the risk of environmental pollution is reduced.

The invention discloses a method for deeply removing arsenic from a nickel sulfate solution, which comprises the following steps: adjusting the pH value by using nickel hydroxide to form colloid to preliminarily remove arsenic, oxidizing by using sodium sulfate, and adding polyferric sulfate to form ferric hydroxide colloid to deeply adsorb and remove arsenic, and is simple in process, convenient to implement in the production process, capable of greatly reducing the cost and reducing the environmental pollution, and suitable for industrial production. The method comprises the following steps: adjusting the pH value of a low-pH leaching solution / anolyte / crude nickel sulfate dissolving solution to 4.0 or more by using nickel hydroxide, carrying out filter pressing to remove slag, adding arsenic ions in a sodium persulfate oxidation solution, reacting for 30 minutes, adding polyferric sulfate, reacting for 30 minutes, and carrying out filter pressing to obtain a nickel sulfate solution which is almost free of arsenic, and the method is efficient, safe and environment-friendly.

The utility model discloses an electroplating nickel sulfate recovery processing device, which relates to the technical field of electroplating liquid recovery and comprises a processing barrel, a partition plate is fixedly arranged in the middle of the inner side of the processing barrel, a fixing sleeve is fixedly arranged in the middle of the partition plate, and an inserting rod is inserted into the fixing sleeve. The partition plate is arranged in the treatment barrel, the interior of the treatment barrel can be divided into two parts through the partition plate, the two parts can achieve absorption of nickel ions by resin and regeneration and reduction of the resin respectively, the fixing sleeve is arranged in the middle of the partition plate, and the rotatable inserting rod is arranged in the fixing sleeve in an inserted mode. A storage box is arranged at the top end of the insertion rod through a supporting plate and a movable rod, resin can be stored in the storage box, and switching of the resin between the nickel ion absorption state and the regeneration reduction state can be achieved by switching the position of the storage box in the treatment barrel, so that continuous recovery treatment of the device on electroplated nickel sulfate can be achieved.

The invention discloses a method for recovering metal molybdenum and tungsten in a waste hydrofining catalyst, which comprises the following three steps: pretreating a hydrogenation catalyst containing molybdenum and tungsten, preparing a leaching solution, and refining and extracting the metal molybdenum and tungsten, and comprises the following steps: sorting the waste catalyst containing molybdenum and tungsten to remove impurities such as porcelain balls and the like; the method comprises the following steps: carrying out ball-milling grinding, sodium modification oxygen-enriched roasting, water leaching, filtering, leaching, refining and the like, carrying out sodium modification roasting on the ground material in an alkaline medium to remove impurities such as deposited carbon, colloid and asphaltene in a catalyst pore channel, and then carrying out water leaching to separate organic matters; finally, efficient separation, extraction and recovery of diamond tungsten in the waste catalyst are achieved in the mode that vanadium is extracted firstly, then molybdenum is extracted and then tungsten is extracted, and an acid method total leaching technology is adopted, the recovery method protected by the invention is simple in technology, little in pollution and high in metal tungsten recovery rate, byproducts of ammonium metavanadate and nickel aluminum powder can be further separated in a gradient mode, and the method is suitable for industrial production. And nickel sulfate and aluminum hydroxide products are obtained.

The invention relates to a method for recovering nickel and cobalt from a mixture of compounds of these metals from the recycling of spent lithium-ion batteries, comprising the following steps: a) digestion of a mixture of nickel and cobalt compounds in a solution containing hydrochloric acid having a concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is solid; or bringing the mixture of nickel and cobalt compounds to a hydrochloric acid concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is a solution; b) activation of ion-exchange resin in a column using hydrochloric acid; c) passing the solution from step a) through the column filled with the ion-exchange resin activated in step b); d) washing the column with hydrochloric acid having a concentration of more than 25 mass % in order to wash out the remaining solution containing nickel ions; e) washing the column with hydrochloric acid having a concentration of less than 10 mass % in order to wash out cobalt ions; f) extraction distillation of the nickel ion solution obtained in step d) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of nickel sulfate(VI) and electrolysis in order to recover metallic nickel; g) extraction distillation of the cobalt ion solution obtained in step e) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of cobalt sulfate(VI) and electrolysis in order to recover metallic cobalt; h) extraction distillation of the solution of diluted hydrochloric acid with nickel and cobalt ions obtained after the activation of the ion-exchange resin in step b), using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; recycling of a mixture of the formed cobalt sulfate(VI) and nickel sulfate(VI) to digestion in step a); i) rectification of diluted hydrochloric acid having a concentration below the azeotropic concentration (approx. 20.2 mass % at atmospheric pressure) formed in extraction distillation processes in steps f)-h) in order to concentrate hydrochloric acid and recover and recycle of water; recycling of concentrated hydrochloric acid to extraction distillation in steps f)-h).

The invention relates to the technical field of chemical synthesis, and discloses a method for preparing 2, 5-furandicarboxylic acid, which comprises the following steps: dispersing cobalt nitrate and nickel sulfate into an aqueous solution of polyvinylpyrrolidone at room temperature; adding a sodium borohydride solution to obtain nano colloid; preparing an aqueous suspension of cerium oxide, and adding the aqueous suspension into the nano colloid; centrifugally filtering, and recovering a solid product; washing the solid product; centrifuging, putting solid powder obtained after centrifuging into a drying oven, and drying; and calcining and grinding the solid powder to finally prepare the Co-Ni / CeO2 catalyst. And dissolving 5-hydroxymethylfurfural in water at normal temperature, adding the prepared Co-Ni / CeO2 catalyst and a sodium hypochlorite solution, reacting, and filtering to remove the catalyst, thereby obtaining the 2, 5-furandicarboxylic acid. The method disclosed by the invention has the advantages of no use of strong base, low reaction temperature, short reaction time, few byproducts, greenness and sustainability.

The invention discloses a nickel-molybdenum hydrogen evolution electrode and a preparation method and application thereof, and belongs to the technical field of water electrolysis hydrogen production. The preparation method of the nickel-molybdenum hydrogen evolution electrode provided by the invention comprises the following steps: carrying out alkali oil removal and acid activation treatment on a nickel net to obtain a pretreated nickel net; and the pretreated nickel net serves as a cathode, electrodeposition is conducted in electroplating liquid containing nickel sulfate hexahydrate, sodium molybdate dehydrate, sodium citrate dehydrate, boric acid, sodium chloride and an additive, separation and collection are conducted, and the nickel-molybdenum hydrogen evolution electrode is obtained. The overpotential of the prepared hydrogen evolution electrode material can be as low as 44 mV under the current density of 10 mA cm <-2 >, and the overpotential of the hydrogen evolution electrode material can be as low as 118.5 mV under the current density of 100 mA cm <-2 >. And under the current density of 100 mA cm <-2 > and in a 1 mol / L KOH solution at normal temperature, the material can stably run for more than 250 hours, has excellent stability, and has a wide application prospect in the field of hydrogen production by electrolysis of water.

The invention belongs to the technical field of metal material plating, and particularly relates to a connector surface composite coating and a preparation process thereof, and the preparation process comprises the following steps: adding modified carbon black and sodium molybdate into deionized water, stirring to obtain a corrosion inhibition material, and mixing with modified zinc oxide to obtain a mixed filler; the preparation method comprises the following steps: adding dibutyltin dilaurate and toluene diisocynate into polypropylene glycol to obtain a core material; adding hexadecyl trimethyl ammonium bromide and the mixed filler into a 93-96 wt% ethanol solution, adding the core material for emulsification, adding an isophorone diisocyanate solution, and stirring to obtain a microcapsule; nickel sulfate hexahydrate, nickel chloride hexahydrate, sodium citrate, boric acid, a surface dispersant, a sodium hydroxide solution and microcapsules are added into deionized water to be mixed, and an electroplating solution is obtained; and putting the connector into the electroplating solution for electroplating to obtain the composite coating. The expansion of pitting corrosion can be inhibited, and the long-term use reliability and stability of the connector in a marine environment are improved.

The present invention provides a process for preparing a high-purity nickel sulphate solution, comprising the steps of: i. forming an aqueous mixed metal sulphate solution by reacting sulphuric acid with a raw material feed comprising nickel, manganese, cobalt, and magnesium in an aqueous medium; ii. extracting manganese from said aqueous mixed metal sulphate solution, thereby obtaining a first aqueous raffinate comprising nickel, cobalt and magnesium, and a manganese-rich organic phase; iii. extracting cobalt from said first aqueous raffinate, thereby obtaining a second aqueous raffinate comprising nickel and magnesium, and a cobalt-rich organic phase; and iv. extracting magnesium from said second aqueous raffinate solution, thereby obtaining a high-purity nickel sulphate solution, and a magnesium-rich organic phase.

This invention discloses a method for preparing a tufted nickel-cobalt hydroxide nanomaterial modified electrode material. The tufted nickel-cobalt hydroxide is prepared on carbon paper using a constant potential method. The electrolyte is a solution of nickel sulfate and cobalt sulfate. The specific operation is as follows: S1. Carbon paper pretreatment; S2. Electrode preparation is a solution containing nickel sulfate and cobalt sulfate; S3. Electrode preparation finally obtains the tufted electrode material.

The application discloses a method for recovering nickel and phosphorus from electroless nickel plating waste liquid, and the method comprises the following steps: preparing nickel sulfate through extraction and stripping, and preparing iron phosphate through Fenton oxidation and precipitation; compared with the prior art, the method is characterized in that the waste liquid is pretreated, insoluble solid particles in the waste liquid are removed, emulsification of an extractant caused by particles in a subsequent extraction process is prevented, damage to extraction oil is avoided, and the extraction efficiency is ensured; in addition, the extractant used in the method can be recycled, secondary pollution is avoided, and the method is economical and practical; in the method, main pollutants in waste water are all converted into important chemical raw materials, recycling is realized, sulfuric acid and Fenton reagents used are all converted into terminal products, difficulty of end waste water treatment is not increased, clean production is met, the treatment cost is low, the product has high added value, and the method has strong practicability.

The invention discloses a method for removing aluminum, calcium and magnesium and recovering nickel from waste hydrogenation catalyst pickle liquor through complete extraction, and belongs to the technical field of hydrometallurgy. A method for removing aluminum, calcium and magnesium and recovering nickel from waste hydrogenation catalyst pickle liquor through complete extraction comprises the following steps that S1, the waste hydrogenation catalyst pickle liquor containing nickel, aluminum, calcium and magnesium is taken, the pH of the pickle liquor is adjusted, first-stage multi-stage counter-current extraction is conducted through a composite organic extraction phase, and an aluminum-loaded organic phase and aluminum-removed raffinate are obtained; s2, adjusting the pH value of the aluminum removal raffinate, and carrying out second-stage multi-stage counter-current extraction by adopting a composite organic extraction phase to obtain a calcium and magnesium loaded organic phase and a purified nickel sulfate solution; s3, the purified nickel sulfate solution is subjected to evaporative crystallization, and a nickel sulfate product is obtained; wherein the composite organic extraction phase comprises a main extraction agent, a synergistic extraction agent A and a synergistic extraction agent B; the method has the advantages of being high in nickel recovery rate, thorough in impurity removal, short in technological process, free of slag dust pollution and the like.

The invention belongs to the technical field of hydrometallurgy, and discloses a method for preparing nickel sulfate and cobalt sulfate from nickel feed liquid. The method comprises the following steps: 1) carrying out first extraction on the nickel feed liquid by using a nickel-cobalt extraction agent to obtain a first organic phase and first raffinate; 2) washing the first organic phase with a first washing solution, wherein the first washing solution comprises sulfuric acid and nickel sulfate; (3) the washed first organic phase is subjected to reverse extraction, and a first regenerated organic extraction agent and nickel-cobalt enrichment liquid are obtained; 4) performing second extraction on the nickel-cobalt enriched liquid by using an impurity extracting agent to obtain a second organic phase and a mixed solution of nickel sulfate and cobalt sulfate; 5) washing the second organic phase by using a sulfuric acid solution, and 6) carrying out reverse extraction on the washed second organic phase to obtain a reverse extraction solution and a second regenerated organic extracting.By adopting the method provided by the invention, nickel and cobalt enrichment can be realized from the high-calcium-magnesium solution, impurity ions can be effectively removed, the process is simple, and the cost is low.

The invention discloses a Cr-Mo-Nb alloy and a production method thereof, belongs to the field of metal regeneration and cyclic utilization, and solves the problem that the treatment mode of an existing high-temperature alloy difficult-to-treat material is backward. The alloy comprises the following chemical components in percentage by mass: 22-26% of Mo, 9-13% of Nb, less than or equal to 2% of C and the balance of Cr and inevitable impurity elements, and the production method comprises the following production steps: briquetting one or more of nickel-based alloys to generate an alloy briquetting; then smelting is conducted, the smelted alloy is subjected to water quenching through a nickel sulfate solution, and alloy particles are generated; then carbonylation synthesis treatment is carried out, nickel carbonyl and carbonylation slag are obtained after carbonylation synthesis treatment, the carbonylation slag is subjected to hydraulic classification, and the carbonylation slag is divided into a light component material and a heavy component material; and mixing the heavy component material with graphite powder, briquetting, and carrying out reduction roasting to obtain the Cr-Mo-Nb alloy. The device saves time and labor, is high in adaptability, can effectively treat difficult-to-treat materials piled up for a long time in a factory, and greatly facilitates work of the factory.

Provided is a method capable of selectively leaching Ni from an oxidized ore containing Ni and Si. The method of leaching nickel from an oxidized ore according to the present disclosure includes the steps of: preparing a liquid leaching agent containing a hydrogen bond acceptor that has made contact with hydrochloric acid, and a hydrophobic organic compound (provided that unsubstituted alicyclic hydrocarbon compounds and unsubstituted aromatic hydrocarbon compounds are excluded); and contacting an oxidized ore containing nickel and silicon with the leaching agent.

The application provides a purification and impurity removal method of a crude nickel-cobalt-manganese sulfate solution, and comprises the following steps: (1) adding thiosulfate to the crude nickel-cobalt-manganese sulfate solution to remove copper; (2) adding phosphate and adjusting the pH value to remove titanium, iron and aluminum; (3) adding iron sulfate and adjusting the pH value to remove phosphorus and silicon; (4) adding a bismuth agent and adjusting the pH value to remove chlorine; (5) adding a fluorine agent to remove calcium and magnesium; and (6) adding an ice rock mineral adsorbent to remove fluorine. The method can efficiently remove iron, aluminum, copper, fluorine, phosphorus, titanium, calcium, magnesium, chlorine, silicon and other elements from the crude nickel-cobalt-manganese sulfate solution, and the loss of main metals is low; the high-purity nickel-cobalt-manganese sulfate solution prepared can directly meet the requirements of a battery preparation grade precursor solution, the process is simple, the operation difficulty is low, and the industrialized production can be easily realized, and the method overcomes the shortcomings of the current high-purity nickel-cobalt-manganese sulfate solution preparation method.

The invention relates to the technical field of catalysts, and discloses a preparation method and application of a cerium-based metal organic framework photoelectric catalyst, and the preparation method comprises the following steps: (1) dispersing tetravalent cerium salt and an organic ligand in an organic solvent, adding a crystallization regulator, and carrying out a heating reaction; after the reaction, washing and drying to obtain a Ce (IV)-MOF material; (2) the Ce (IV)-MOF material is subjected to vacuum activation and then dispersed in an exchange solvent, nickel salt is added, Ni functionalization reaction is carried out, and the nickel salt is nickel acetate, nickel nitrate, nickel sulfate, nickel chloride or nickel bromide; and after the reaction, washing and drying to obtain the Ce (IV)-MOF-Ni material. The Ce (IV)-MOF material with a good crystal structure is successfully prepared, and meanwhile, the prepared Ni functionalized Ce (IV)-MOF-Ni material has excellent efficiency and stability of hydrogen production by photoelectrocatalytic water decomposition.