Method for rapidly preparing cobalt oxide

Abstract

The invention discloses a method for rapidly preparing cobalt oxide. The method comprises the following steps: mixing, weak acid leaching, peracid leaching, cobalt precipitation and calcining technology. According to the method, cobalt metal ions are effectively leached from waste lithium cobaltate raw materials in a two-stage selection manner by using the characteristics of high cobalt content and low contents of other metal impurities of the waste lithium cobaltate raw materials; meanwhile, the other metal impurities are removed, and a high-purity cobalt ion solution is obtained; the cobaltion solution is precipitated by ammonium bicarbonate and then are combined; residues are leached out, and a cobalt oxide product is obtained by a calcining procedure. When the waste lithium cobaltateraw materials are treated by using the method disclosed by the invention, no reducing agent is used, so that the risk that sulfur dioxide gas is generated when sulfuric acid is reduced and leached isavoided, and working procedures of removing impurities by chemical precipitation, deeply removing the impurities by organic extraction and the like are reduced, further a production flow is effectively shortened, and the production cost is reduced; in addition, the method has the advantages of simple leaching process, stable and reliable technical conditions, high cobalt recovery rate, simple equipment and no generation of harmful gases, and is worthy of being popularized and used.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and more specifically relates to a method for rapidly preparing cobalt oxide. Background technique [0002] Cobalt oxide (Co 2 0 3 ) is a high-valent oxide of cobalt, with a theoretical cobalt content of 71.06%, an oxygen content of 28.94%, and a density of 6.079 / cm3. It is a black amorphous powder. Cobalt oxide is insoluble in water, but soluble in acid to form corresponding salts. It is widely used in ceramics, glass and other industries. [0003] With the doubling of cobalt consumption at home and abroad, waste lithium cobalt oxide raw materials have become one of the main raw materials for the production of cobalt series products such as cobalt salt, cobalt oxide and electrolytic cobalt. It comes from domestic lithium-ion battery cathode material enterprises (Dangsheng Technology, Tianjin Strand, Hunan Ruixiang and Shanshan and other enterprises) leftovers and substandard products p...

AI Technical Summary

Problems solved by technology

[0009] The disadvantage of this production process is: in the actual operation of sulfuric acid reduction leaching production, the amount of reducing agent is often 2-3 times the theoretical amount of chemical reaction, resulting in consumption and waste of reducing agent, increasing production costs, if the amount is not increased, cobalt oxide It cannot be completely reduced, and it is difficult to increase the leaching rate of cobalt. With the addition of excess reducing agent, the sulfur dioxide produced cannot participate in the metal reaction in the mineral in a timely and effective manner, causing sulfur dioxide gas to overflow the leaching tank. The harmful gas is recovered and treated by sodium carbonate during the absorption process. It will not only increase the consumption of chemical materials, but also easily cause environmental pollution accidents

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