Process for producing cobaltic-cobaltous oxide

Abstract

The invention relates to a process for producing cobaltosic oxide. The process steps comprise that: boodtite powder is crushed and selectively leached out valuable metals such as cobalt and the like under the acid condition, after removing impurities and recovering the valuable metals such as copper, nickel, manganese, a solution of cobalt salt, of which the cobalt concentration is more than 100g / L, is obtained; and the solution of cobalt salt is diluted by deionized water to be between 88 and 92g / L, and the solution of cobalt salt and a solution of sodium hydroxide are continuously added in a reaction kettle at the same time, the pH value is controlled to be between 10 and 11, the compressed air is pumped in, the obtained suspension of cobaltous hydroxide is overflowed from the reaction kettle, filtered and washed by deionized water, and the washed cobaltous hydroxide is dried or placed in a calcinator with adjustable gas atmosphere, calcined at a temperature of between 400 and 1,300 DEG C for 6 to 20 hours, and crushed and graded to obtain the cobaltosic oxide. The process has the advantages of short flow and low consumption, and the reducer used in the reductive leaching process of the boodtite is a byproduct of ferrous salt generated in the whole technological process, thereby saving a large amount of sodium sulfite.

Description

technical field [0001] The invention relates to a production process for producing tricobalt tetroxide by using hydrocobalt ore as a raw material, and belongs to the field of chemical industry. Background technique [0002] In recent years, with the rapid development of electronic products, lithium-ion batteries have been widely used in all aspects of life. The rapid expansion of lithium-ion batteries has accelerated the market's consumption of lithium cobalt oxide, the positive electrode material of lithium-ion batteries. The properties of cobalt tetroxide, one of the raw materials for preparing lithium cobaltate, directly affect the performance of the produced lithium-ion battery. Many manufacturers use cobalt salts purchased directly from other manufacturers as raw materials in the production of cobalt tetroxide. Because they are not produced by themselves, they are not sure about the specific conditions of the cobalt salts, which will also affect the performance of the p...

AI Technical Summary

Problems solved by technology

Many manufacturers use cobalt salts purchased directly from other manufacturers as raw materials in the production of cobalt tetroxide. Because they are not produced by themselves, the specific conditions of the cobalt salts are not accurately grasped, which will also affect the performance of the produced cobalt tetroxide.

In addition, many manufacturers use oxalic acid to prepare cobalt oxalate salt and then calcine it to make tricobalt tetroxide. The oxalic acid used in this method is expensive, which increases the production cost and causes great environmental pollution.