Method for preparing manganese-doped basic cobalt carbonate

Abstract

The invention discloses a method for preparing manganese-doped basic cobalt carbonate. The method comprises the following steps: adding a sodium carbonate solution and a cobalt chloride solution intoa reaction kettle, controlling the pH value of the reaction system within 6.0-7.8, controlling the reaction temperature to 90-95 DEG C, and performing stirring to react for 5-6 hours so as to obtain basic cobalt carbonate slurry; and dehydrating the basic cobalt carbonate slurry while the basic cobalt carbonate slurry is hot, transferring the dehydrated basic cobalt carbonate slurry into an immersion kettle, adding a saturated manganese chloride solution into the immersion kettle, performing a stirring reaction, and performing filter pressing dehydration and drying in sequence so as to obtainthe manganese-doped basic cobalt carbonate. Therefore, sodium carbonate is adopted to replace ammonium bicarbonate to prepare basic cobalt carbonate to serve as an ultrafine cobalt powder precursor, ammonia-containing wastewater is not generated, no pollution is caused to the atmosphere, the impurity content of the prepared precursor is low, and the production requirement of cobalt powder on the current market can be met; and moreover, saturated manganese chloride is adopted to dope basic cobalt carbonate, so that the conductivity of the basic cobalt carbonate precursor can be enhanced, and the stability is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of basic carbonates, and in particular relates to a preparation method of manganese-doped basic cobalt carbonate. Background technique [0002] Cobalt tetroxide is an important transition metal oxide, usually used as the main raw material for the production of hard alloys, lithium battery materials, electronic materials, colorants in the ceramic industry and catalysts in the chemical industry; in the chemical industry, cobalt tetroxide is a High-efficiency and long-lasting catalyst; basic cobalt carbonate material is an important raw material for the production of lithium batteries - the precursor material of tricobalt tetroxide, and its production technology is crucial to the performance of lithium batteries. [0003] There are many production methods for tricobalt tetroxide, and the oxalic acid precipitation method is usually used to produce cobalt oxalate, which is then calcined to produce ...

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Problems solved by technology

[0003] There are many production methods for tricobalt tetroxide, and the oxalic acid precipitation method is usually used to produce cobalt oxalate, which is then calcined to produce cobalt oxalate, but its cost is relatively high; domestic researchers put ammonium bicarbonate solution into inorganic cobalt salt solution to produce basic cobalt carbonate , and then calcined to produce tricobalt tetroxide. The research on the production method has also achieved good technological breakthroughs and production applications. This method has a lower cost advantage. However, the microcosmic particle morphology of the basic cobalt carbonate produced by this method is needle-shaped. Or complex loose structure, it is easy to form a higher anion (mainly chloride ion, nitrate ion or sulfate ion) package between the crystal nuclei; at the same time, the reaction is also easy to generate anion-containing complexes and double salt products; usually , the anion residue in this basic cobalt carbonate material is more than 2%, and can reach 6% when it is high, resulting in the production of HCl and HNO in the calcination process 3 or H 2 SO 4 Acid gas, acid gas overflow causes serious corrosion of equipment and harsh production environment

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