Method for purifying rough cobalt hydroxide through cobalt precipitation by replacement method
A technology of cobalt hydroxide and replacement method, which is applied in the direction of improving process efficiency, etc., and can solve the problems of high impurities in crude cobalt hydroxide, high magnesium oxide consumption, and large amount of active magnesium oxide additives, etc.
Pending Publication Date: 2021-11-16
CHINA NERIN ENG
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However, during a cobalt precipitation process, the amount of active magnesia additive required is large, and a small amount of active magnesia will be entrained into the precipitate, and other manganese and zinc ions will precipitate simultaneously with cobalt ions, resulting in crude cobalt hydroxide High impurities and high consumption of magnesium oxide
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[0045] Take the process optimization of the cobalt production line of a copper-cobalt hydrometallurgy plant as an example.
[0046] The original technological process is: low-copper raffinate - iron and manganese removal - two-stage cobalt precipitation - filtration and drying - crude cobalt hydroxide. Specifically, using raw ore with a Co content of 0.21%, a Mn content of 0.41%, and a Zn content of 0.25%, through the traditional low-copper raffinate-removal of iron and manganese process, the Co content is 1.24%, and the Mn content is 2.04%. %, Zn content of 0.94% and other low-copper raffinate; the low-copper raffinate adopts the traditional two-stage cobalt precipitation process, one stage of cobalt precipitation is added to active magnesium oxide slurry, the produced precipitate mainly contains cobalt hydroxide, filtered, washed , after drying, the Co content in the crude cobalt hydroxide was 29.51%, the Mn content was 7.58%, the Zn content was 4.5%, and the Mg content was ...
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The invention provides a method for purifying rough cobalt hydroxide through cobalt precipitation by a replacement method, and belongs to the technical field of non-ferrous metal wet smelting. According to the method, after impurity ions such as iron and manganese in cobalt precipitation feed liquid are removed, cobalt precipitation is carried out in two stages, first-stage cobalt precipitation slag serves as a product, and second-stage cobalt precipitation slag serves as an additive for first-stage cobalt precipitation; and before first-stage cobalt precipitation, impurity ions in cobalt precipitation liquid mainly remain manganese and zinc ions, and based on a traditional first-stage cobalt precipitation method, excessive magnesium oxide is added to enable the terminal pH to reach 8.0-8.5 in order to improve the direct recovery rate of cobalt, so that the defects that a large amount of ions such as manganese and zinc are precipitated into first-stage cobalt precipitation residues, but the content of impurities and the consumption of magnesium oxide are easily increased are overcome. The method has the advantages that the content of impurities in the coarse cobalt hydroxide is reduced, so that the content of cobalt in the coarse cobalt hydroxide is increased, and the consumption of active magnesium oxide is reduced, so that the production cost is reduced.
Description
technical field [0001] The invention belongs to the technical field of nonferrous metal wet smelting, and in particular relates to a method for purifying crude cobalt hydroxide by cobalt precipitation by a replacement method. Background technique [0002] At present, the cobalt raw material supplied in the market is mainly crude cobalt hydroxide. The cobalt content of the crude cobalt hydroxide product is generally more than 30%, and it also contains manganese, magnesium and other impurity ions. Because copper and cobalt are more associated with copper, the hydrometallurgy process of copper cobalt ore is generally produced by neutralizing iron and manganese in copper raffinate - two-stage cobalt precipitation - filtration and drying - crude cobalt hydroxide. [0003] In the current mainstream two-stage cobalt precipitation process, the first-stage cobalt precipitation additive is activated magnesia, and the second-stage cobalt precipitation additive is calcium oxide; wherein...
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IPC IPC(8): C22B3/46C22B23/00
CPCC22B3/46C22B23/0469Y02P10/20
Inventor 张海宝伏晓丹骆贞江王玮
Owner CHINA NERIN ENG