37 results about "Cobalt(II) oxalate" patented technology

The invention relates to low-oxygen content submicron cobalt powder and a cobalt oxalate precursor and a manufacturing method thereof, wherein the low-oxygen content submicron cobalt powder is prepared by the steps of preparing the cobalt oxalate precursor through the solid-liquid reaction of cobalt carbonate powder and an oxalate solution and then reducing the cobalt oxalate precursor. The low-oxygen content submicron cobalt powder can keep low oxygen content in fine submicron-level products, is difficult to fire in the reduction procedure, is easy to stably run in all processes of the production process and has convenient preparation.

The invention discloses a biological selectivity leaching method of low-grade copper-cobalt ore, and belongs to the field of microbial metallurgy. The biological selectivity leaching method comprises the following steps: the copper-cobalt ore is crushed and grinded; a mixed bacterium liquid containing ferrous oxide micro spirilla, acidophilic thiobacillus ferrooxidans and acidophilic thiobacillus thiooxidans is introduced to a 9 K of culture medium for cultivating to obtain a bacterium culture solution. The copper-cobalt ore is added to the bacterium culture solution to conduct bacterium leaching on the cobalt concentrate; when the leaching rate of cobalt in the bacterium leaching liquid reaches above 97%, the leaching liquid containing valuable metal ions such as cobalt and copper is separated from the leaching residue; then Lix984N extraction agent is adopted to extract copper to obtain a copper product; the raffinate from which the copper is extracted is subjected to precipitation and iron removing treatment by a jarosite process to obtain an iron product; cobalt-containing liquid after being subjected to iron removal is crystallized to obtain a cobalt oxalate product. The biological selectivity leaching method has the advantages of short technique flow, easy operation, simple equipment, low energy consumption, no high-temperature smelting, no emission of pollutant smoke and poisonous gas, and quick achievement of separation and efficient recovery of cobalt and other valuable metals.

The invention provides a method for preparing nanometer cobalt powders with spherical face-centered cubic structures by using a mechano-chemical method, which belongs to the technical field of preparing metal powders from metal material. The method comprises the following steps of: weighting the corresponding oxalic acid, cobalt salt and surfactant according to the stoichiometric ratio of each element in a chemical formula, and then mixing; ball-milling, leaching and washing to obtain a precursor liquid; balling and atomizing to prepare the spherical precursors; splitting and reducing the precursors in a nitrogen-hydrogen atmosphere; and finally dispersing through sealed gas flow and performing vacuum packaging to obtain the target matters. The nanometer cobalt powders prepared by the method provided by the invention has the following characteristics: the average particle size is smaller than 200 nanometers, the structure is a 100% face-centered cubic structure, the purity is larger than 99.9% (excepting the oxygen content), the oxygen content is smaller than 1.0%, the appearances of the particles are in spherical shapes, and the size distribution is good. The method is widely applied to the ultrafine and nanometer-scale hard alloy, the ball-milling and mixing time can be reduced, cobalt pools can be reduced, and the performances of the hard alloy can be improved. The production process of the method is simple, so that the method is easy to operate.

The invention discloses a preparation method based on a solid-phase reaction for a capacitor electrode material. The preparation method comprises the following steps of: 1) adequately mixing and grinding cobalt acetate, oxalic acid and oxidized graphene to obtain an cobalt oxalate-oxidized graphene mixture; and 2) calcining the cobalt oxalate-oxidized graphene mixture aforementioned to obtain a cobaltosic oxide-graphene electrode material, wherein the dosage ratio by mole of cobalt acetate to oxalic acid is 1: 1, and the dosage of oxidized graphene is 5-30% of the mass of the finally obtained cobaltosic oxide; additionally, the selected ligand can also be citric acid and hexamethylenetetramine except oxalic acid; a solvent is not used in the solid-phase reaction of the preparation method disclosed by the invention, so that the side reactions generated in a water-phase reaction are avoided, the yield and the purity are increased, the reaction conditions are easy to control, and the operation is simple and practicable; and moreover, via the introduction of the graphene material, a novel way is provided for an oxide material with bad electrical conductivity, good energy storage property, and high theoretical specific capacitance in the field of capacitors, and the graphene material has important theoretical and practical application significance.

The invention discloses a treatment and purification process for defective cobalt oxalate products, comprising the following steps: step 1, adding waste cobalt oxalate to ammonium carbonate to obtain filter residue containing cobalt carbonate and ammonium oxalate solution; step 2, adding the filter residue of step 1 to hydrochloric acid, the filtrate is cobalt chloride solution; step three, the cobalt chloride solution of step two is extracted and removed; step four, the ammonium oxalate solution obtained in step one is concentrated to 50-100g / L; step five, step three obtain The high-quality cobalt chloride solution is added ammoniacal liquor by 5%-30% of cobalt mass to obtain complexed cobalt salt solution, then excessive 10%-30% is added in the ammonium oxalate solution obtained in step 4 to the complexed cobalt salt solution; The invention removes impurities from defective ammonium oxalate and then produces high-quality ammonium oxalate, and the ammonium oxalate produced by the conversion of carbonate can be used as a material for the preparation of ammonium oxalate, reducing the loss of ammonium oxalate, recycling and reducing costs, which is worthy of great efforts promote.

The invention relates to a preparation method using starch as a carbon-based load, and relates to the technical field of supercapacitors. The method includes the following steps: S1, uniformly mixing a starch solution and a cobalt source solution to obtain a mixed solution; wherein, the cobalt source solution It is an aqueous solution containing a cobalt compound, and the cobalt-containing compound is selected from one or more of cobalt nitrate, cobalt chloride or cobalt oxalate; S2, carbonizing the mixed solution to obtain a carbon template; S3, applying to the The carbon template is added with deionized water to carry out a hydrothermal reaction, and the reaction product is cooled and dried to obtain a composite material. The present invention also relates to the starch-based carbon-supported composite material prepared by the above method and its application in supercapacitors. The starch-based carbon-supported composite material provided by the invention has excellent electrochemical performance, and has great application prospects in energy storage, conversion, catalyst and other related application fields.

The present invention provides a cobalt oxalate granularity real-time prediction method in hydrometallurgy synthesis process. The method comprises the steps of data collecting, auxiliary variable selecting, standardized processing, hybrid model establishing, etc. The invention is characterized in that a parallel-connected structure hybrid model composed based on mechanism model and based on data driving model is established. A genetic algorithm is adopted for confirming the related model parameter in the mechanism model. A model based on data driving is used as an error compensating model of mechanism model. The invention also provides a software system which actualizes the cobalt oxalate granularity prediction. The software system comprises a main program, a database and a human-machine interaction interface. The system software uses a microcomputer of hydrometallurgy synthesis process control system as a hardware platform. When the cobalt oxalate granularity real-time prediction method is used for the cobalt oxalate synthesis process of a certain hydrometallurgy factory for predicting the granularity of cobalt oxalate, the prediction result is in the preset error range. The cobalt oxalate granularity real-time prediction method according to the invention has the advantages of simple model, strong interpretability, good extrapolation property and higher prediction precision.

The invention discloses a method for recovering cobalt from a lithium battery anode material. The method is characterized by comprising the following steps of: (1) removing aluminum foil from the anode material, obtaining a black solid matter containing lithium cobalt oxide, roasting the black solid matter to form lithium cobalt oxide powder, (2) weighing and adding the lithium cobalt oxide powder into 119-240g / L of citric acid according to a solid-to-liquid ratio of (20-30):1g / L, adding hydrogen peroxide at a mass fraction of 30% according to a mole ratio of 2:(1-1.05), performing stirring leaching for 5-7h at 80-90 DEG C, filtering to form filtrate containing the cobalt, (3) adding an ammonium oxalate solution into the filtrate to form a cobalt oxalate precipitate, and (4) after drying the cobalt oxalate precipitate, adding lithium carbonate powder according to a mole ratio (1:(1-1.05)) of the cobalt to lithium, grinding uniformly, roasting for 6-8h at 800-850 DEG C, and obtaining lithium cobalt oxide powder capable of directly serving as the electrode material. The method is easy to operate and high in recovery rate, equipment is simple, waste liquid is easy to treat, and the pollution of waste lithium batteries to an environment can be effectively reduced.

The present invention relates to a method for preparing cobaltosic oxide by calcinating cobalt oxalate with microwave. A hearth of a microwave rotary kiln adopts a composite microwave heating pipe, and the high wave absorbing property of silicon carbide is utilized to perform auxiliary heating, so that the cobalt oxalate is decomposed partially in a silicon carbide section, and then materials decomposed partially pass through a special microwave ceramic section with high wave-transmitting performance to accelerate the temperature rate of the cobalt oxalate and continue to calcine the cobalt oxalate for decomposition, so that the defects of high energy consumption, long production period and the like in the conventional calcining method are overcome, and the microwave calcination of weak wave absorbing substances is realized. The method realizes the continuous and large-scale calcination of the cobalt oxalate, and the granularity and the cobalt content of the cobalt oxalate products, namely cobaltosic oxide reach the YS / T256-2000 standard.