121 results about "Cobalt hydroxide" patented technology

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

This invention discloses a method for preparing sheet-like nano-sized cobalt hydroxide. The method includes the following steps: using cobalt nitrate as the cobalt source and sodium hydroxide solution as the precipitant, a co-precipitation reaction is carried out. The cobalt nitrate solution and sodium hydroxide solution are added together to a reaction vessel. By controlling the synthesis pH and temperature, the synthesized cobalt hydroxide slurry is washed with hot pure water, dried, and crushed using an air jet mill to obtain sheet-like nano-sized pink cobalt hydroxide with low sodium content. Specifically, the key to preparing sheet-like nano-sized cobalt hydroxide is to prevent oxidation and particle agglomeration during the synthesis process. This invention uses a low-temperature (40-60℃), low-pH (8.0-9.0) cobalt hydroxide synthesis process with a small amount of antioxidant added to prepare sheet-like micron-sized cobalt hydroxide that is not easily oxidized or agglomerated. In addition, at the low pH, the sodium content is low, making the subsequent filtration and washing steps easier to operate.

This invention discloses an organocobalt salt for improving the tensile strength of rubber and its preparation method, belonging to the field of rubber technology. The organocobalt salt for improving the tensile strength of rubber comprises, by mass parts, 140-210 parts of organosilicon vegetable fatty acid, 20-30 parts of solvent, 20-30 parts of cobalt hydroxide, and 10-16 parts of propionic acid. The organosilicon vegetable fatty acid is obtained by reacting rosin with organosilicon maleimide. The organosilicon maleimide is obtained by reacting maleic anhydride with a silicon-containing long-chain fatty amine. The silicon-containing long-chain fatty amine is obtained by reacting methyldiethoxysilane with an unsaturated long-chain fatty amine. The organocobalt salt obtained by this invention has a good effect on promoting the adhesion between metal and rubber while effectively improving the tensile strength of rubber.

The invention discloses a cobalt hydroxide electrode, the cobalt hydroxide electrode is cobalt hydroxide loaded by foamed nickel, the cobalt hydroxide is amorphous phase cobalt hydroxide, and the microstructure of the cobalt hydroxide is a nanoneedle. The electrode obtained by the invention has the characteristics of relatively high catalytic activity and relatively strong reaction kinetics. The invention further discloses a preparation method and application of the cobalt hydroxide electrode.

The invention discloses a preparation method of an efficient bionic photocatalytic material. The preparation method comprises the following steps: soaking rose leaves in a glutaraldehyde solution; soaking the rose leaves in a hydrochloric acid solution; the pretreated rose leaves are placed in a tetrabutyl titanate solution, and a precursor material A is obtained; oxidizing cobalt hydroxide into cobalt oxide in a muffle furnace to obtain a precursor material B; depositing indium nitrate on the precursor material B to obtain a precursor material C; calcining the precursor material C in a muffle furnace, removing part of the biological template, and converting the remaining biological template into a biological carbon carrier; placing the carbon-based bionic photocatalyst in an N2 inert gas protective atmosphere, and calcining the carbon-based bionic photocatalyst in a tubular furnace; and taking out the calcined material, cooling to room temperature, and cleaning the cooled material for multiple times to obtain the bionic photocatalyst. The preparation method of the efficient bionic photocatalytic material is used for efficiently degrading organic matters in water.

The invention provides a multi-stage combined leaching method for ultra-low grade laterite nickel ore, including: firstly, the raw laterite nickel ore slurry is treated by high pressure acid leaching to obtain the high pressure leaching tailings containing iron, aluminum and magnesium and the high pressure leaching solution containing nickel, cobalt and manganese. The mass percentage of nickel in the raw laterite nickel ore is less than 1.0%; Secondly, the high pressure leaching solution, laterite nickel ore slurry and acid solution were mixed to obtain the mixed solution, and the mixed solution was subjected to multi-stage atmospheric pressure leaching treatment, after concentration treatment, the final concentrated atmospheric pressure leaching solution and the final concentrated atmospheric pressure leaching slurry with the same concentration as the raw laterite nickel ore slurry. Finally, the final concentrated atmospheric pressure leaching solution and high pressure leaching tail residue were successively recycled leaching, multi-stage pre-neutralization, counter-current decantation washing, Fe / Al / Cr removal and MHP precipitation to obtain nickel and cobalt hydroxide products. the invention can effectively restrain the scaling rate of conventional high pressure acid leaching treatment and prolong the production cycle.

This invention provides a one-dimensional silver nanostructure / metal hydroxide composite material, its preparation method, and its application. The preparation method includes: adding a one-dimensional silver nanostructure, a metal salt, and an additive to a solvent and stirring to disperse them evenly; adding an acidic or alkaline reagent under stirring conditions to adjust the pH of the solution, causing the metal ions in the solution to convert into metal hydroxide precipitates, obtaining a one-dimensional silver nanostructure-metal hydroxide suspension; then performing solid-liquid separation, washing and drying the obtained solid product to obtain a one-dimensional silver nanostructure / metal hydroxide composite powder; wherein the metal hydroxide is aluminum hydroxide, zinc hydroxide, magnesium hydroxide, iron hydroxide, manganese hydroxide, copper hydroxide, nickel hydroxide, or cobalt hydroxide, and the one-dimensional silver nanostructure is silver nanowire or silver nanoribbon. The resulting composite material uses metal hydroxide as a carrier and separator, inhibiting the drying and agglomeration of silver nanowires from the source, exhibiting high conductivity and good redispersibility, thus improving conductivity.

The application discloses an active magnesium-based material, a preparation method and application thereof, and relates to the technical field of magnesium-based materials. The method comprises the following steps: grinding and crushing at least one of an interface modification additive, a chelating agent and a heterogeneous nucleating agent to prepare a modifier; taking active magnesium oxide and / or common magnesium oxide as raw materials, mixing and stirring the magnesium oxide raw materials with the modifier to modify the magnesium oxide raw materials, and obtaining an active magnesium-based material, wherein the addition amount of the modifier is 0.05-3% of the total mass of the magnesium oxide. The method can modify the magnesium oxide raw materials through the modifier to adjust the hydration activity of the active magnesium-based material, and can also improve the dispersion performance, chelating performance and / or precipitation speed of the active magnesium-based material, thereby improving the application performance of the active magnesium-based material in the field of hydrometallurgy. When the active magnesium-based material is used for precipitating nickel and cobalt, the active magnesium-based material has excellent precipitation efficiency, low unit consumption, and can also reduce the content of impurities in nickel hydroxide and cobalt hydroxide.

The invention discloses a composite electrocatalyst based on polyurethane foam, a preparation method and a battery. The composite electrocatalyst is nitrogen and sulfur co-doped carbon foam loaded with cobalt hydroxide nanosheets and CoP, and the specific surface area of the carbon foam is 186-211m < 2 > / g; the carbon foam is obtained by calcining a polyurethane foam-based transition metal composite material in an inert atmosphere at the temperature of 700-750 DEG C. According to the present invention, the cobalt hydroxide nanosheet and the cobalt phosphide are loaded so as to provide the rich self-supporting pore structure, such that the specific surface area of the electrocatalyst can be easily increased, and the cobalt hydroxide nanosheet and the cobalt phosphide are loaded so as to provide the rich adsorption site for the oxygen. Through co-doping of nitrogen and sulfur, the active sites of the electrocatalyst are further increased, and the kinetic efficiency of oxygen reduction reaction is improved. Moreover, in the oxygen reduction reaction process, the composite electrocatalyst is not prone to agglomeration, active substance falling and other problems, and therefore the circulation capacity of the oxygen reduction reaction can be improved.

The invention relates to a method for preparing cobalt chloride from a cobalt raw material leaching solution, which comprises the following steps: (1) carrying out reduction leaching on crude cobalt hydroxide slurry by using a hydrochloric acid solution and hydrogen peroxide to obtain a leaching solution; (2) carrying out primary impurity removal on the leachate obtained in the step (1), and carrying out extraction impurity removal by using a P04 organic extraction agent, so as to obtain raffinate; and (3) pre-treating the raffinate obtained in the step (2), then extracting by adopting an N263 organic extraction agent, and sequentially washing and reversely extracting the obtained loaded organic phase to obtain a cobalt chloride finished product liquid. The hydrochloric acid solution and hydrogen peroxide are adopted for reduction leaching, the purity of cobalt chloride can be guaranteed, and introduction of sulfur is avoided; the N263 organic extraction agent is adopted to extract cobalt, the selectivity on cobalt is high, the extraction capacity on impurities such as Ni / Mg is basically avoided, saponification is not needed due to organic matter, direct extraction can be achieved, and finally the cobalt chloride finished product liquid with the low impurity content is obtained.

The invention relates to a method for producing a Fischer-Tropsch synthesis catalyst. The present invention relates to a method for conveniently preparing a supported cobalt-containing Fischer-Tropsch synthesis catalyst having improved activity and selectivity for C5 + hydrocarbons. In one aspect, the present invention provides a process for preparing a supported cobalt-containing Fischer-Tropsch synthesis catalyst, the process comprising the steps of: (a) impregnating a support material with i) a cobalt-containing compound and ii) acetic acid or a manganese salt of acetic acid in a single impregnation step to form an impregnated support material; and (b) drying and calcining the impregnated support material; wherein the support material impregnated in step (a) is not previously modified with a metal source other than cobalt; and wherein when the cobalt-containing compound is cobalt hydroxide, a manganese salt of acetic acid is not used in step (a) of the process.

This invention discloses a comprehensive recovery method for nickel, cobalt, manganese, and scandium, belonging to the field of metal production or refining technology. The method includes: pretreatment of nickel-cobalt hydroxide by ultrasonic grinding with oxygen / air introduction; selective leaching of the pretreated nickel-cobalt hydroxide with dilute sulfuric acid solution, followed by solid-liquid separation to obtain manganese oxide slag and a first leachate; using a synergistic extraction system formed by a compound of an organophosphate extractant, a neutral phosphorus-oxygen extractant, and an organic diluent as the first extractant; scandium extraction of the first leachate using the first extractant to obtain a scandium-loaded organic phase and raffinate; precipitation of vanadium and removal of iron in the raffinate, followed by solid-liquid separation to obtain iron alum slag and a second leachate; and nickel-cobalt extraction of the second leachate to obtain a nickel-cobalt-loaded organic phase. This invention enables efficient recovery of nickel, cobalt, manganese, and scandium, and effective separation from impurities.

The application of nano cobalt hydroxide in improving the seed germination rate of rape under salt stress is disclosed.The application is to apply a solution containing nano cobalt hydroxide to rape seeds;in the solution, the concentration of nano cobalt hydroxide is 0.008-0.012 g / L.After the seed treatment of the above specific concentration of nano cobalt hydroxide on the rape seeds under salt stress, the germination rate, germination potential and germination index of the rape seeds can be significantly improved, and the seed germination rate of rape is improved.

The invention discloses a method for efficiently refining a cobalt nickel hydroxide intermediate product, and relates to the technical field of hydrometallurgy, the method comprises the following steps: step S1, alkaline pressurized oxidation; s2, carrying out solid-liquid separation and washing; s3, normal-pressure acid leaching is conducted, specifically, the oxidized cobalt nickel hydroxide intermediate product in the step S2 is subjected to normal-pressure leaching with sulfuric acid, and finally solid-liquid separation is conducted to obtain Ni / Co-containing leaching liquid and Mn-containing leaching residues; s4, neutralization and impurity removal, wherein the oxidized cobalt nickel hydroxide intermediate product obtained in the step S2 is added into the leachate obtained in the step S3 to serve as a neutralizer and an oxidizing agent; and S5, SO2 is subjected to low-temperature pressurization reduction leaching. According to the method, the alkaline pressurized oxidation and normal-pressure acid leaching processes of the nickel-cobalt hydroxide intermediate product are adopted, a series of problems of long subsequent manganese separation process, large wastewater discharge and the like caused by synchronous leaching of nickel, cobalt and manganese in the leaching process of the nickel-cobalt hydroxide intermediate product are solved, and favorable conditions are created for simplifying the refining process of the nickel-cobalt hydroxide intermediate product and reducing the production cost.

The invention discloses an active magnesium-based material as well as a preparation method and application thereof, and relates to the technical field of magnesium-based materials. The method comprises the following steps: crushing and grinding at least one of an interface modification aid, a chelating agent and a heterogeneous nucleating agent to prepare a modifier; active magnesium oxide and / or common magnesium oxide are / is used as a raw material, the magnesium oxide raw material and a modifier are mixed, stirred and modified, the active magnesium-based material is obtained, and the adding amount of the modifier accounts for 0.05-3% of the total mass of magnesium oxide. According to the method, the magnesium oxide raw material can be modified through the modifier so as to adjust the hydration activity of the active magnesium-based material, and the dispersion performance, the chelation performance and / or the precipitation speed of the active magnesium-based material can be improved, so that the application performance of the active magnesium-based material in the field of hydrometallurgy can be improved, and when the active magnesium-based material is used for precipitating nickel and cobalt, the precipitation efficiency is improved. The method has the advantages of excellent precipitation efficiency and low unit consumption, and can reduce the content of impurities in nickel hydroxide and cobalt hydroxide.

The invention discloses a rear cover laminated board with improved bending performance and a preparation method thereof, relates to the technical field of electronic product shells, and provides the rear cover laminated board with improved bending performance and the preparation method thereof. The silicon carbide fiber is used as a base material, the tensile strength of the silicon carbide fiber is high, and excellent rigid support can be provided for the laminated board, so that the bending strength of the epoxy composite material is improved, and the performance requirement of a 3C shell is met. The modified epoxy resin is used as a matrix, the silicon carbide ceramic fiber cloth coated with dopamine is doped, and the cobalt hydroxide nanosheets are loaded on the silicon carbide ceramic fiber cloth, so that the strength of the laminated board is enhanced. Then, dopamine is used for coating, and a silicon dioxide aqueous solution is used for forming a silicon dioxide-containing micro-nano structure on the surface, so that the surface hydrophobicity is enhanced. The prepared shell material not only has enough rigidity, but also has excellent toughness, and meets the requirements of'deformation resistance 'and'fracture resistance'.

The invention relates to a method for recovering nickel and cobalt from cobalt nickel hydroxide slag. The method comprises the following steps: mixing the cobalt nickel hydroxide slag with an ammonium solution, and carrying out ammonia leaching reaction to obtain an ammonia complexing solution; the ammonia complexing solution is sequentially subjected to oxidation decomplexing and a first sulfuration reaction, and a manganese and copper removal ammonia complexing solution is obtained; the manganese and copper removal ammonia complexing solution is subjected to a reduction reaction to obtain nickel-cobalt powder and a zinc ammonia complexing solution; the zinc-ammonia complexing solution is subjected to a second vulcanization reaction to obtain an ammonium solution, and the ammonium solution is recycled; according to the method, nickel and cobalt in cobalt nickel hydroxide are efficiently recycled, the purity of nickel and cobalt powder preferably reaches 99.5% or above, the recovery rate of nickel preferably reaches 94.2% or above, the recovery rate of cobalt preferably reaches 91.8% or above, and the method is simple in technological process, low in cost, environmentally friendly and good in industrial application prospect.

The invention provides a high-voltage and high-rate lithium cobalt oxide battery positive electrode composite material and a preparation method thereof. The high-voltage and high-rate lithium cobalt oxide battery positive electrode composite material comprises lithium cobalt oxide battery positive electrode material particles A and lithium cobalt oxide battery positive electrode material particles B, the particle A is LiCo < 1-a-b > Mg Al O < 2 > (at) M, LiCo < 1-a-b > Mg Al O < 2 > is doped lithium cobalt oxide, (at) M represents a coating layer M formed on the surface of the doped lithium cobalt oxide nuclear material, the doping amount of the aluminum element accounts for 8000-9000 ppm of the doped lithium cobalt oxide, and the doping amount of the magnesium element accounts for 1000-1500 ppm of the doped lithium cobalt oxide; the chemical formula of the particles B is LiCo1-c-d-e-gMgcAldZreNbgO2 (at) N, and the coating layer M is formed on the surface of the doped lithium cobalt oxide by sintering raw materials including cobalt hydroxide, aluminum oxide, titanium dioxide, lithium fluoride and yttrium oxide; and the coating layer N is formed on the surface of the doped lithium cobalt oxide by sintering raw materials including cobalt hydroxide, aluminum oxide, titanium dioxide, lithium fluoride and yttrium oxide. The positive electrode composite material disclosed by the invention shows more excellent capacity, rate and cycle performance at a high voltage of 3.0-4.55 V and a high temperature of 45 DEG C.

The invention provides a preparation method of micro-powder-free cobalt hydroxide, belongs to the technical field of lithium ion battery material preparation, and solves the problems that the content of micro powder is high and the synthesis process is difficult to control when the cobalt hydroxide is prepared in the prior art. The method comprises the following operation steps: preparing a solution, carrying out a synthetic reaction, aging, washing, drying and the like, and synthesizing a crimson beta-type cobalt hydroxide product with a product index D0 greater than or equal to 3 microns and regular morphology by controlling the temperature of a synthetic raw material solution at-5 to + 5 DEG C and controlling proper synthesis conditions. The cobalt hydroxide prepared by the method is regular in microstructure, does not contain fine micro-powder particles, and can be used for preparing cobaltosic oxide required by high-voltage lithium cobalt oxide.

The application discloses a preparation method of anti-aging regenerated plastic particles and relates to the technical field of plastics. The anti-aging regenerated plastic particles are prepared by using regenerated plastic as raw material, melting and blending the regenerated plastic with layered composite nanoparticles first, increasing the contact sites, removing free radicals and strengthening the anti-aging performance, then immersing the plastic particles into a polymethyl methacrylate hot coating solution mixed with hydroxylated graphene, and finally forming a layer-by-layer assembly structure after cooling to improve the anti-aging performance. The layered composite nanoparticles are prepared by using cobalt chloride and magnesium sulfate to generate layered hydroxide through coprecipitation and then modified by 3-(benzyldimethylammonium) propane sulfonic acid. The sulfonate is intercalated into the layered hydroxide particles to assist magnesium and cobalt hydroxide, realize the effect of flame retardation and smoke suppression, and improve the dispersibility with better contact with free radicals in the plastic, so that the aging is effectively inhibited.

The invention discloses a cobalt complex pre-catalyst for electrocatalytic oxygen evolution and a preparation method thereof, and relates to the technical field of functional complexes. The structure of the cobalt complex pre-catalyst (CotPBA-anion) is formed by coordination of a cobalt coordination cation unit chelated by tPBA and an anion; the structure of the catalyst is CoOOH / tPBA, and the catalyst is characterized in that the catalyst is cobalt oxyhydroxide loaded by an organic ligand. Wherein the CoOOH / tPBA reconstructed by using the CotPBA-Cl shows the optimal electrochemical activity and stability. The pre-catalyst is simple in preparation process and mild in reaction condition, and shows good electro-catalytic oxygen evolution reaction activity and electrochemical stability after simple reconstruction.

The invention discloses a ternary positive electrode material precisely coated with a bifunctional material and a preparation method of the ternary positive electrode material, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: step 1) adopting a sol-gel method to obtain LiAl (WO4) 2 powder; and 2) uniformly dispersing LiAl (WO4) 2 powder, Co (OH) 2 and the ternary positive electrode material Lix (NiaCobMnc) O2 to obtain a mixture, and sintering the mixture to obtain the ternary positive electrode material accurately coated with the bifunctional material, and 3) crushing the ternary positive electrode material precisely coated with the bifunctional material to obtain the ternary positive electrode material. According to the invention, lithium aluminum tungstate is coated at a relatively low temperature during one-time sintering, and cobaltous hydroxide is coated at a relatively high temperature, so that the cycling stability and safety of the ternary positive electrode material under high voltage can be improved, and meanwhile, the ionic conductivity of the ternary positive electrode material can be improved, so that the charge-discharge performance of the battery is improved.

The application discloses a production process of high-quality electroplating-grade nickel sulfate large-particle crystals, and relates to the technical field of preparation of nickel sulfate.The process measures, such as precisely controlling the concentration degree of nickel sulfate solution and the crystallization temperature, improving the saturation of the solution, adjusting the crystal structure transformation and the like, are adopted to promote the growth of large particles to form the large-particle crystals.The nickel sulfate crystals can meet the electroplating industry standards.The concentrated nickel sulfate solution is conveyed to a crystallizer through a pipeline, and the crystallizer is cooled by circulating cooling water, so that small crystals are formed by preliminary crystallization, and the small crystals are used as crystal seeds to grow into large particles in the crystallizer.The organic solvent with weak polarity is selected as a crystallizing agent to differentiate the crystal water in the nickel sulfate molecules, promote the generation and precipitation of the crystals, and improve the crystallization rate.The nickel-cobalt hydroxide raw material is subjected to ozone oxidation treatment and pH adjustment, so that the impurities in the nickel solution are separated and graded, and the subsequent wastewater treatment process is simplified.

The application belongs to the technical field of scandium separation and purification, and particularly relates to a method for separating and purifying scandium from crude nickel-cobalt hydroxide, which comprises the following steps: using 0.1-0.5 mol / L dilute sulfuric acid to leach the crude nickel-cobalt hydroxide, and filtering to obtain a scandium-containing leaching solution, wherein the ratio of the dilute sulfuric acid to the crude nickel-cobalt hydroxide is (3-5) mL:1 g, and the molar ratio of sulfuric acid to scandium is (3-5):1; using an extractant comprising Cyanex572 and Aliquat336 to treat the scandium-containing leaching solution to obtain a scandium-containing organic phase; using an oxalic acid solution to back-extract the scandium-containing organic phase to obtain scandium oxalate precipitation; and calcining the scandium oxalate precipitation to obtain scandium oxide. The technical scheme adopts a selective leaching process to realize efficient separation of scandium from main metals nickel and cobalt at the front end, has low reagent consumption, a short process, and great cost advantages; a new type of synergistic extraction technology is adopted, which has super-high selectivity and extraction capacity for scandium, the prepared scandium oxide has a purity of greater than or equal to 96%, and the scandium recovery rate is greater than or equal to 89%.

The invention discloses a method for refining cobalt nickel hydroxide and separating nickel and cobalt, and belongs to the technical field of metal production or refining. The method comprises the following steps: adding water into cobalt nickel hydroxide for wetting, introducing oxygen or ozone for oxidizing and slurrying, and performing ultrasonic enhancement to obtain cobalt nickel hydroxide slurrying liquid; adding dilute sulphuric acid for selective leaching; carrying out vanadium precipitation and iron removal on the leach liquor subjected to selective leaching; a phosphoric acid extraction agent, an alkyl hydroxime extraction agent and an organic diluent are compounded to form a synergistic extraction system, saponification is carried out, and the saponified synergistic extraction system is used for carrying out nickel and cobalt dynamic extraction separation on the leaching solution obtained after vanadium precipitation and iron removal. According to the method, the cobalt extraction speed of a synergistic extraction agent system is higher than that of nickel, cobalt is extracted preferentially, then nickel extraction is conducted on cobalt extraction raffinate, nickel and cobalt are directly extracted into an organic phase, and nickel and cobalt products are obtained through separation and purification. Efficient extraction of nickel and cobalt and effective separation of nickel and cobalt from iron, scandium, manganese and the like can be achieved, and the extraction pH is reduced.

The application relates to a method for synthesizing 2,5-furan dicarboxylic acid from 5-hydroxymethylfurfural by using a ruthenium-loaded copper-cobalt metal oxide composite magnesium oxide catalyst. The method comprises the following steps: mixing and grinding a copper-cobalt hydroxide precursor prepared by a hydrothermal-calcination method with anhydrous magnesium acetate and then calcining to obtain a catalyst carrier; and using an impregnation-reduction method to load ruthenium nanoparticles on the carrier as an active component. The synergistic effect of the active component and the carrier enables 5-hydroxymethylfurfural to be catalytically converted into 2,5-furan dicarboxylic acid in a high-efficiency and selective manner. The catalyst preparation process is simple and easy to scale up. In the absence of alkali, the conversion rate of 5-hydroxymethylfurfural can reach 100%, and the yield of 2,5-furan dicarboxylic acid is 86.1%. The semi-preparative liquid chromatography is used for green separation and purification of the product, and 2,5-furan dicarboxylic acid with a purity of more than 99% is obtained. The method has potential application value for large-scale production of 2,5-furan dicarboxylic acid.

The present application relates to a kind of methods for separating and recovering cobalt from crude cobalt hydroxide, the method comprises the following steps: first, crude cobalt hydroxide, cobalt-containing acid leaching solution, first sulfuric acid solution, oxidizing agent and fluorine-containing additive are mixed to carry out first leaching reaction, the first leaching system is cooled and crystallized, and solid-liquid separation is carried out to obtain cobalt-containing leaching residue;Second, the cobalt-containing leaching residue is dissolved and treated, and solid-liquid separation is carried out to obtain cobalt-rich solution and insoluble residue;Then, reducing agent, second sulfuric acid solution and the insoluble residue are mixed to carry out second leaching reaction, and solid-liquid separation is carried out to obtain cobalt-containing acid leaching solution and return;Efficient selective separation and recovery of cobalt resource in crude cobalt hydroxide is realized, so that the cobalt recovery rate is preferably as high as 99% or more, while the impurity removal rate is preferably as high as 95% or more, compared with traditional one-step reduction acid leaching process, the consumption of reducing agent, oxidizing agent and neutralizing agent is reduced, and the separation and recovery cost is reduced.

The present application relates to the technical field of lithium battery electrode material preparation, in particular to a kind of high-purity, small size cobalt hydroxide and its preparation method and application, comprising the following steps: after the pre-mixing of solid powder of cobalt salt, amphoteric ligand, protective agent is uniform, then join alkaline solid, subsequently transfer to ball mill jar, ball mill under normal temperature and normal pressure, after ball milling, the ball material mixture is washed, centrifuged, dried to obtain high-purity, small size cobalt hydroxide.The present application ingeniously utilizes the reduction effect of amphoteric ligand construction buffer system and protective agent, effectively controls the rate of Co 2+ React with OH ‑ Co (OH) 2 is further oxidized during synthesis, so the prepared cobalt hydroxide has the characteristics of high purity, small size, etc., and has excellent specific capacity when used to prepare lithium cobaltate positive electrode material.In addition, the synthesis method also has the advantages of simple operation, less three wastes, etc., and has good industrialization application prospect.

The utility model discloses cobalt hydroxide flash drying equipment which comprises a heat collector, a circulating pump, an oil-air heat exchanger, a first hot air duct, a hot air furnace, a fan, an oil storage tank, a combustor, a flash drying tower and a second hot air duct, the heat collector, the circulating pump and a first cavity in the oil-air heat exchanger are connected in series to form a circulating loop, an air inlet is formed in the hot blast stove, the first hot air duct is communicated with the air inlet, a second cavity of the oil-air heat exchanger is located in the first hot air duct, and the fan is used for blowing hot air in the first hot air duct into the hot blast stove. The oil storage tank, the combustor and the hot-blast stove are sequentially connected in series, the combustor is used for igniting fuel oil entering the hot-blast stove, and the flash drying tower is communicated with an air outlet of the hot-blast stove through a second hot air duct. The cobalt hydroxide flash drying equipment provided by the utility model has the advantages of high photo-thermal utilization efficiency, low drying cost of cobalt hydroxide and high efficiency.

The invention belongs to the field of hydrometallurgy technology and high-purity valuable metal recovery, and particularly relates to a method for comprehensively recovering valuable metal from crude nickel cobalt hydroxide, which comprises the following steps: (1) acid leaching and manganese recovery; (2) recycling scandium; and (3) nickel and cobalt are recycled. The invention provides an integrated short-process green process for recovering four high-purity products from crude nickel cobalt hydroxide, and the process integrates key technologies such as three-section acid leaching manganese extraction, C272 extraction-hydrogen peroxide electrolysis synergistic purification, carbon dioxide selective reverse extraction and the like, so that efficient recovery of metals and cost reduction and efficiency improvement in the process are realized.