208 results about "Cobalt hydroxide" patented technology

The application discloses a composite precipitant for wet refining of laterite nickel ore and a wet refining method of laterite nickel ore. The composite precipitant for wet refining of laterite nickel ore is composed of a mixture of magnesium oxide and sodium hydroxide, and the mass fraction of sodium hydroxide in the composite precipitant is greater than 0 and less than or equal to 99%. The wet refining method of laterite nickel ore comprises the following steps: directly or after being grinded, the composite precipitant is added into an acidic solution to be refined, and stirring is performed to make the composite precipitant fully react with the acidic solution to be refined; after concentration, a clear liquid and a solid-containing slurry are obtained; the solid-containing slurry is filtered and washed with water to obtain a solid containing nickel hydroxide, cobalt hydroxide or nickel hydroxide-cobalt hydroxide, so that nickel, cobalt or nickel-cobalt is precipitated. The composite precipitant and the wet refining method of laterite nickel ore have the advantages of simple process, low cost, easy process control, easy settlement and filtration of nickel hydroxide (and cobalt hydroxide) precipitation, and the production efficiency can be significantly improved and the energy consumption can be reduced.

The invention relates to the technical field of drying, in particular to a flash evaporation drying device for cobalt hydroxide production, which comprises a drying cylinder, fan blades, a ceramic ring and a first-stage separation assembly, a drying cavity is formed in the drying cylinder, the fan blades are rotatably arranged at the lower part of the drying cavity, and the fan blades can rotate around the axis of the fan blades; and the ceramic ring is arranged at the upper part of the drying cavity and used for driving the air in the drying cavity to spirally move from bottom to top. The first-stage separation assembly is arranged, materials which are not discharged out of the drying cavity through the pottery ring can fall into the first vortex disc, the materials with different particle sizes are adaptively crushed in the first vortex disc, so that the particle uniformity of the materials entering the drying cavity again from the first vortex disc is improved, and in addition, the larger the particle size of the materials is, the larger the particle size of the materials is, the larger the particle size of the materials is. And the retention time of the materials in the first-stage separation assembly is longer, so that the temperature uniformity of the materials is also improved.

The invention relates to a battery material preparation technology, in particular to a method for preparing high-purity cobaltous sulfate from crude cobaltous hydroxide, which comprises the following steps: S1, reacting the crude cobaltous hydroxide with sulfuric acid to generate magnesium sulfate; s2, washing to remove magnesium; s3, adding sulfuric acid and hydrogen peroxide into the crude cobalt hydroxide after magnesium washing; adding crude cobalt hydroxide to adjust the pH value to obtain a purified solution; s4, adding sodium fluoride into the purified liquid, and filtering after reaction to obtain filtrate; s5, saponifying with sodium hydroxide by using an acidic extractant, then performing soap conversion by using a cobalt sulfate solution, extracting manganese in the filtrate by using an obtained organic phase, and then performing reverse extraction on the organic phase by using sulfuric acid to obtain a manganese sulfate solution; s6, the raffinate obtained after manganese extraction is introduced into an adsorption tower loaded with a zirconium-based composite fluorine adsorbent; and S7, concentrating and crystallizing the defluorinated solution. According to the method, the zirconium-based composite fluorine adsorbent is introduced to be coupled with the process, fluorine ions can be removed, and cobalt loss caused by cobalt fluoride precipitation and the influence of the fluorine ions on the quality of a cobalt sulfate product are avoided.

The present disclosure belongs to the field of batteries, and particularly relates to cobalt hydroxide and a preparation method therefor, a positive electrode material, a battery and electrical equipment. Provided in the present disclosure is cobalt hydroxide, the particles of which are in the shape of a sheet and have an average thickness of 10-20 nm. The cobalt hydroxide of the present disclosure is nanosheets having an extremely small average thickness and a larger surface area, which can thus improve the coating effect thereof on a positive electrode material, thereby effectively inhibiting the formation of a nickel oxide rock salt-like phase in the positive electrode material, reducing the concentration of residual lithium on the surface of the positive electrode material and enabling lithium ions to be quickly deintercalated / intercalated; therefore, the electrical properties of the positive electrode material prepared therefrom can be significantly improved.

The utility model relates to the technical field of drying and energy saving, and particularly discloses a cobalt nickel hydroxide or cobalt hydroxide drying system based on waste heat steam utilization, which comprises a mixing device, a steam rotary drying device, a dust removal device and a spray washing device which are connected in sequence, steam in the upstream flash evaporation process is subjected to deacidification treatment and then is introduced into a heat exchange tube bundle of the steam rotary drying device to serve as a heat source; the discharging end of the steam rotary drying device is respectively connected with a discharging branch and a material returning loop through a discharging screw; the material returning loop is connected to one feeding hole of the material mixing device, and the other feeding hole of the material mixing device is connected with a nickel cobalt hydroxide or cobalt hydroxide wet material conveying device. An indirect heat exchange mode is adopted, only a small amount of hot air is needed to serve as moisture-carrying gas, the tail gas amount is greatly reduced, meanwhile, damage to materials caused by direct contact with high-temperature hot air in a traditional drying mode is avoided, the physical property of the materials can be kept, and the particle size and quality of products are improved.

The invention discloses a foamed nickel-based composite material based on an electro-deposition / hydrothermal synthesis method, which is characterized in that firstly, foamed nickel NF is used as a substrate, cobalt hydroxide is loaded on the surface of the NF through electro-deposition, and Co (OH) 2 / NF with a lamellar stacked flower-shaped structure is obtained; the preparation method comprises the following steps: preparing NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF, then converting the NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF into ZIF-67 through an impregnation method to obtain ZIF-67 (at) Co (OH) 2 / NF with a regular dodecahedron structure, and finally, preparing NiCo-LDH (at) Co (OH) 2 / NF with a honeycomb stacked structure through a hydrothermal method. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparing the foamed nickel loaded ZIF67 and cobalt hydroxide; and 3, preparing the nickel foam loaded nickel-cobalt layered double-metal hydroxide and cobalt hydroxide. When the material is used as a supercapacitor material, the area specific capacitance is 17-18F cm <-2 > when the current density is 1mA cm <-2 >; and when the current density is 10mAcm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

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 relates to the technical field of chemical product preparation, in particular to a cobalt hydroxide preparation device and a preparation process thereof. The cobalt hydroxide preparation device comprises a reaction kettle provided with a manhole, the manhole is provided with a manhole cover, the manhole cover comprises a lower seat and a fixing assembly, a support is hinged to the lower seat, a connecting seat is arranged on the support, an upper cover is arranged on the connecting seat, the upper cover is used for controlling the opening and closing of the manhole, a sealing ring is arranged between the lower seat and the upper cover, the fixing assembly is used for fixing the lower seat and the upper cover, the upper cover can rotate around a second axis, the direction of the gravity of the connecting seat and the upper cover and the second axis are coplanar, when the manhole is opened through the upper cover, the lower end surface of the upper cover and the upper end surface of the lower seat are kept parallel in a short time, and then the damage of the sealing ring caused by uneven stress is avoided, the connecting seat can rotate around a first axis, the first axis and the second axis are perpendicular, the upper cover has the freedom of two rotating directions, and the damage of the sealing ring is reduced.

The application provides a one-dimensional iron oxide nanorod heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of photoelectrocatalytic water splitting hydrogen production. The composite material provided by the application comprises: one-dimensional iron oxide nanorods, cuprous sulfide nanoparticles loaded on the one-dimensional iron oxide nanorods, and cobalt hydroxide nanosheets coated on the surfaces of the one-dimensional iron oxide nanorods and the cuprous sulfide nanoparticles. On one hand, the Fe2O3 / Cu2S p-n heterojunction is introduced to accelerate the separation of photo-generated carriers in the Fe2O3 nanorod array, and on the other hand, the Co(OH) x The surface OECs accelerate the kinetics process of interfacial water oxidation, the rapid depletion of photo-generated holes further improves the charge separation of the photoanode surface, and the synergistic effect between the Fe2O3 / Cu2S p-n heterojunction and the OECs significantly improves the PEC water splitting performance of the iron oxide nanorod array composite material.

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.

The invention relates to the technical field of preparation of sodium-ion battery electrode materials, in particular to an oxygen reduction function NaxCoO2 surface modified sodium-ion battery layered oxide positive electrode material and a preparation method thereof.The positive electrode material takes NaNixFeyMnzO as a matrix, cobalt salt and alkali liquor are mixed in absolute ethyl alcohol, and the sodium-ion battery layered oxide positive electrode material is prepared. The cobalt ions are driven by electrostatic adsorption to preferentially form a cobalt hydroxide coated precursor layer on the surface of the substrate, and the NaxCoO2 coating modified sodium ion battery layered oxide positive electrode material is obtained through high-temperature sintering; according to the coating, the performance of the battery is improved through a triple synergistic mechanism: a Co < 3 + > / Co < 4 + > multivalent state is utilized to reduce a movable active oxygen species formed in a charging process into immovable O < 2->, and lattice oxygen precipitation is inhibited; the direct contact between the electrode and the electrolyte is reduced, and the electrode / electrolyte interface side reaction is inhibited; the material has a sodium ion / electron conduction function, and the rate capability of the material is improved. The capacity retention rates of the material prepared by the invention are respectively 81.2% and 55.9% after the material is circulated for 500 times under the voltage of 4.0 V and 4.3 V, the cycle life is long, and the preparation process is simple and controllable.

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.

A positive electrode active material having both higher capacity and safety is provided. Provided is a method for manufacturing a positive electrode active material, including forming a mixed solution containing a cobalt compound and a nickel compound dissolved; making the mixed solution react with an alkaline aqueous solution to obtain a suspension in which a cobalt nickel hydroxide is precipitated; performing first suction filtration of the suspension with use of water; and after the first suction filtration, performing second suction filtration with use of an organic solvent. In the cobalt nickel hydroxide, an atomic ratio of nickel in the sum of an atomic ratio of cobalt and the atomic ratio of nickel is greater than 0 and less than or equal to 0.01.

The present invention provides a method for selectively leaching and removing impurities from nickel and cobalt hydroxide. The method comprises: slurrying nickel and cobalt hydroxide raw materials, then sequentially adding acid and nickel and cobalt hydroxide to adjust the pH value, and obtaining a pre-leached liquid and a pre-leached residue after leaching; slurrying the pre-leached residue, then sequentially adding acid, a reducing agent, and nickel and cobalt hydroxide to obtain a first leachate and a first leach residue after leaching; slurrying the first leach residue, then adding acid, and obtaining a second leachate and a second leach residue after leaching; wherein the second leachate contains copper ions, iron ions, and aluminum ions; mixing the second leachate with a pH adjusting agent, and obtaining a third leachate and a third leach residue after leaching; wherein the third leach residue contains iron and aluminum elements; mixing the third leachate with acid, then adding a copper reducing agent to carry out a reduction reaction, and obtaining a fourth leachate and a fourth leach residue after leaching. This method can improve efficiency and save costs.

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 relates to the technical field of electrolytic hydrogen production, in particular to a hydrogen evolution electrode and a preparation method thereof. The hydrogen evolution electrode comprises a foamed nickel substrate and a Pt-plated cobalt hydroxide nanosheet array which grows on the surface of the foamed nickel substrate in situ, the cobalt hydroxide nanosheet array is uniformly dispersed on the surface of the foamed nickel, and Pt is an amorphous Pt nanocluster which is uniformly dispersed on the surface of the cobalt hydroxide nanosheet. The hydrogen evolution electrode has the advantages of being simple in preparation process, low in cost, high in Pt utilization rate, good in catalytic performance, high in stability and the like, and has wide application prospects in the technical field of seawater electrolysis hydrogen production.

The present invention relates to the technical field of hydrometallurgy, and specifically to a method for selectively leaching and separating cobalt and manganese from crude cobalt hydroxide leaching residue. The separation method provided by the present invention comprises the following steps: S1. pre-reduction treatment; S3. selective oxidation of leached cobalt and precipitated manganese. The separation method of the present invention selectively leaches cobalt by regulating the synergistic effect of ORP and pH, and selects suitable reducing agents and oxidizing agents, and inhibits the dissolution of manganese in steps, thereby reducing the circulation of manganese into the leaching and extraction system, reducing the operating cost of the leaching and extraction, and at the same time introducing a selective complexing agent to reduce the co-dissolution of impurities and simplify the subsequent purification process. The preparation method is simple to operate, easy to industrialize, and has good application prospects.

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 application discloses a method for recovering manganese from crude raw materials, and belongs to the technical field of manganese recovery and treatment in battery materials. The method comprises the following steps: oxidizing and roasting the crude raw materials to be treated to obtain roasted materials; wherein the crude raw materials contain at least one of nickel hydroxide and cobalt hydroxide, and manganese hydroxide; preparing slurry from the roasted materials to obtain slurry; performing normal pressure leaching on the slurry under acidic conditions until the pH value of the leaching solution obtained by normal pressure leaching is 4-6, and then performing solid-liquid separation to obtain the first leaching solution and the first leaching residue containing manganese dioxide; performing high-pressure oxygen leaching on the first leaching residue under acidic conditions to remove most of the residual nickel and / or cobalt in the first leaching residue, and then performing solid-liquid separation to obtain the second leaching solution and the second leaching residue mainly containing manganese dioxide. The method is simple in operation, low in cost, and can recover manganese from crude raw materials at a high yield.

The application provides a treatment method of nickel cobalt hydroxide, comprising the following steps: a first leaching process, reducing and acid leaching the nickel cobalt hydroxide to obtain a leaching solution; a neutralization process, adding a neutralizing agent to the leaching solution to obtain a neutralized solution; a first sulfuration process, adding a first sulfuration agent to the neutralized solution to obtain a first sulfuration solution; a second sulfuration process, adding a second sulfuration agent to the first sulfuration solution to obtain a second sulfuration precipitate; an ion exchange process, adding an ion exchange solution to the second sulfuration precipitate to obtain a third sulfuration precipitate; and a second leaching process, mixing the third sulfuration precipitate with a solvent and oxygen to perform pressurized leaching, and then obtaining a metal salt solution, wherein the metal salt comprises at least one of a nickel salt, a cobalt salt and a manganese salt. The treatment method provided in the embodiments of the application can remove metal impurities such as calcium and magnesium, so that a product containing nickel, cobalt and / or manganese is obtained.

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.

The present invention relates to the technical field of nanomaterial preparation, and in particular to a process method for efficiently preparing nano-cobalt phosphide. The process method comprises a raw material preparation and solution preparation stage, a cobalt hydroxide nano-precipitate generation stage, a cobalt hydroxide precipitate collection and washing stage, a cobalt hydroxide and sodium hypophosphite pretreatment stage, a high-temperature phosphating reaction stage, a stirring and boiling phosphating stage, and a reaction product collection and processing stage. The process method of the present invention realizes efficient and batch preparation of nano-cobalt phosphide through a series of finely controlled steps. The method has the advantages of a simple reaction process, a short required time, high product purity, and uniform particle size distribution. By optimizing reaction conditions and controlling the reaction process, the quality and yield of the product can be further improved.

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.