Method for manufacturing cobalt protoxide used as secondary battery catalyst

Abstract

The invention provides a preparation method for producing cobalt monoxide using lithium cobalt paper, which comprises the following steps: (A) preparing material: providing a lithium cobalt paper; (B) alkali liquefaction: putting the lithium cobalt paper in strong alkali solution, and rinsing for removing aluminum foil to obtain cobalt residue; (C) acidulation: adding sulfate in the cobalt residue, and adding neutralizer; (D) purification: adding sodium chloride in cobalt sulfate solution, removing impurities through pressure filtration, heating, stirring, adding sodium fluoride, and removingimpurities through pressure filtration; (E) extraction: extracting the purified cobalt sulfate solution in stages, and purifying to obtain cobalt nitrate solution; (F) precipitation: heating, well stirring cobalt nitrate solution, adding sodium bicarbonate solution, and the cobalt carbonate is obtained after reaction and precipitation; (G) calcination: calcining cobalt carbonate after dehydrationand drying to obtain the cobalt monoxide. The preparation method has the advantages of low cost of material, good activity, stable property, and fully improved utilization ratio of the cobalt monoxide.

Description

technical field [0001] The invention relates to a preparation method of cobaltous oxide, in particular to a preparation method of cobaltous oxide which uses lithium cobalt paper to prepare nickel-hydrogen and nickel-chromium secondary battery catalysts. Background technique [0002] At present, most manufacturers at home and abroad directly use metal cobalt or semi-finished cobalt salts to produce nickel-metal hydride and nickel-chromium secondary battery catalysts—cobaltous oxide (CoO). However, the current price of metal cobalt is high, and the market price is close to 1 million / ton , while the price of cobalt in 2004 was only 300,000 / ton. Therefore, the price of cobaltous oxide produced by using metal cobalt or cobalt salt is high, and the four heavy metal ions (Cd, Cr 6+ , Hg, Pb) content cannot meet the requirements of the EU RoHS directive, and battery manufacturers cannot accept such substandard products. Manufacturers of cobaltous oxide must develop new processes an...

AI Technical Summary

Problems solved by technology

Cobalt ore is abundant in countries such as Congo and Zambia in Africa. The ore produced in this area is of good quality, usually with a cobalt content of about 5-18% in the ore. The grade of cobalt ore produced in China is too low, and the cobalt content in the ore is usually only 0.5-1 %, this grade of ore has no development value for most small and medium-sized production enterprises. However, due to the political instability in African countries, the corresponding raw ore export policies have also been changed day by day. Since October 2006, the largest producer Congo (gold) promulgated a decree prohibiting the export of raw ore. As soon as this decree came out, it directly led to the rapid rise of the global cobalt price, and the manufacturers that originally relied on cobalt ore also fell into the predicament of insufficient supply of raw materials; cobalt alloys are usually hard Some cobalt-containing metal wastes such as high-quality alloys and white alloys usually produce large pollution when leaching cobalt, which is likely to bring threats to the environment and operators, and the post-processing is relatively difficult. At present, there are few manufacturers using cobalt alloys. ; Lithium-cobalt paper is usually scrap or leftover materials and dismantled materials produced by battery manufacturers. The source of this raw material is stable and the price is low. The disadvantage is that the impurity content is high and there are many, but the cobalt content is usually as high as about 40%. Early lithium-cobalt paper Paper is usually used to produce industrial cobalt oxide. The basis of using lithium cobalt paper to produce cobalt oxide is hydrometallurgy technology. The defect of hydrometallurgy is that the previous process pollutes a lot, and the sulfuric acid used in the leaching process is dissolved, and sulfur dioxide is used to As an auxiliary agent, this process will cause some sulfur dioxide to overflow and cause environmental pollution