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

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 relates to an ammonia circulative preparation method for cobaltous oxalate. In the current commonest liquid phase precipitation method, because ammonium salt is introduced in the reaction process and the amount of oxalic acid is excessive during the reaction, impurities like ammonia nitrogen and oxalic acid root in synthesized waste water are required for processing. According to the invention, cobalt liquid is taken as a raw material, an oxalic acid solution is used for absorbing ammonia gas to prepare an ammonium oxalate solution which can be taken as an auxiliary material, cobalt liquid and the ammonium oxalate solution are added in a reaction vessel for synthesizing to obtain cobaltous oxalate pulp, the cobaltous oxalate pulp is filtered and washed, and dried to obtain the cobaltous oxalate product; simultaneously, waste water after filtering and washing is carried out pH regulation, ammonia molecule is separated from waste water by using an air stripping method, the oxalic acid solution is absorbed to be the ammonium oxalate solution for realizing the ammonia circulative utilization. The preparation method of the invention has the advantages that ammonia circulative utilization is realized, the waste water treatment avoids the introduction of ammonium salt and ammonia nitrogen, the production cost is reduced and the circular economy is realized.

The invention discloses a cobaltosic oxide preparation method. Hydrate cobalt oxalate with an excellent crystal form is prepared at first and used as precursor, and small H2O and CO2 gas molecules are released by controlling a roasting process, so that a cobaltosic oxide nano structure with narrow pore size distribution, high specific surface area and controllable texture is obtained.

The invention provides a method for preparing super-fine cobalt powder which comprises the steps as follows: A) powder of cobalt carbonate or cobalt oxalate is placed in a crushing chamber; the powderof cobalt carbonate or cobalt oxalate is crushed under the action of high-speed airflow, thereby obtaining fine powder of cobalt carbonate or cobalt oxalate; B) the fine powder of cobalt carbonate orcobalt oxalate is graded by a blade grader, so as to facilitate the fine powder of cobalt carbonate or cobalt oxalate with required granularity to go through and the fine powder of cobalt carbonate or cobalt oxalate without required granularity to be retained in an airflow crusher and further crushed; C) the fine powder of cobalt carbonate or cobalt oxalate with required granularity is collectedby a cyclone collector, thereby obtaining the super-fine powder of cobalt carbonate or cobalt oxalate; and D) the obtained super-fine powder of cobalt carbonate or cobalt oxalate is reduced under reducing atmosphere in a reducing furnace. The method for preparing super-fine cobalt powder by super-fine powder of cobalt carbonate or cobalt oxalate, which is obtained by the airflow crusher, has simple operation, profitably improved production efficiency and reduced production cost, so that the method satisfies economic benefit.

The invention discloses a preparation method and application of spherical cobalt oxalate. The preparation method comprises the steps that an oxalic acid solution is dropwise added into a cobalt acetate solution containing cetyltrimethylammonium bromide, stirring is carried out while dropwise adding is carried out, then a precursor is subjected to hydrothermal treatment for a period of time, washing and drying are carried out, and uniform spherical cobalt oxalate with the regular morphology and the particle size being 1-1.2 micrometers can be obtained. The specific capacity of the lithium ion battery negative electrode material reaches up to 1029 mAh / g under the current density of 0.1 A / g, the specific capacity of the lithium ion battery negative electrode material is still 609 mAh / g after 350 cycles under the current density of 0.5 A / g, and the lithium ion battery negative electrode material has application potential. The method disclosed by the invention is simple, the morphology and the particle size of the spherical cobalt oxalate are easy to control, and the cobalt ions in the waste lithium battery are expected to be changed into things of value after being extracted by using an oxalic acid solution, so that the method has relatively great industrial application potential and economic value.

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 discloses a process method for treating cobalt slag of formazan, which comprises the following steps: (1), acid washing and zinc removal, (2), roasting, (3), water immersion, (4), extraction and purification, ( 5) Precipitation of ammonium oxalate, (6) Calcination of cobalt oxalate, the calcination includes adding 10-30wt% sodium persulfate to the pickling slag obtained by pickling and dezincification, after one stage of calcination, the temperature is raised for a second stage of calcination. The beneficial effect of the invention is that in the pickling process, most of the zinc can be recovered by pickling under normal pressure and low pressure, without using high-temperature pressure leaching and other strengthening means, which reduces equipment investment and production costs. Sodium sulfate is used as a roasting additive. It decomposes to generate oxygen to provide an enhanced oxidizing atmosphere for thermal decomposition. The generated sodium sulfate replaces the commonly used concentrated sulfuric acid, reduces the generation of acid mist, and can also destroy the dense oxide film formed on the surface of the ore particles, so that the oxidation of the inner layer Cobalt continues to contact with O2, SO2, SO3, so as to achieve complete sulfation and improve the recovery rate of cobalt.

The invention relates to a cobaltous oxide photocatalytic material with high photoelectrocatalytic activity and a preparation method thereof. According to the method, a precursor is prepared from a cobalt oxalate aqueous solution and a sodium hydroxide aqueous solution, and the cobaltous oxide is prepared through microwave hydrothermal treatment, drying and high-temperature treatment. The invention provides a novel synthesis method of cobaltous oxide powder with a controllable grain size. The method can significantly improve the photocatalytic reaction activity of the material. The cobaltous oxide powder produced by the method is expected to be further applied in the field of photocatalysis. The production method is low in cost and simple and convenient in synthesis process, can be applied to mass production, and effectively saves the production cost. The cobaltous oxide powder prepared by the method has excellent photoelectrocatalytic activity and has a relatively large commercialization prospect.

The invention discloses a preparation method and application of spherical cobalt oxalate. First, an oxalic acid solution is dropped dropwise into a cobalt acetate solution containing cetyltrimethylammonium bromide, and the dropwise addition is performed while stirring, and then a precursor is added dropwise. The body water is heated for a period of time, and then washed and dried to obtain uniform spherical cobalt oxalate with regular morphology and particle size of 1-1.2 μm. After 350 cycles at A / g, it still has a specific capacity of 609mAh / g, which is a potential anode material for lithium-ion batteries. The disclosed method is simple, the shape and particle size of spherical cobalt oxalate are easy to control, and it is expected to turn waste into treasure after extracting cobalt ions in waste lithium batteries with oxalic acid solution, which has great industrial application potential and economic value.

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 invention relates to a method for preparing cobalt oxalate nano-wires. The method includes steps of 1), dissolving cobalt nitrate hexahydrate and surfactants in solvents to prepare solution A and dissolving oxalic acid in solvents to prepare solution B; 2), mixing the solution A and the solution B with each other and carrying out water bath reaction. The method has the advantages that the method is easy to implement and high in yield, and cobalt oxalate nano-wire products with high purity, regular morphology and good distribution uniformity can be prepared by the aid of the method.

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.