Method for removing copper, manganese, iron, calcium and magnesium from cobalt salt solution through three-section extraction method

Abstract

The invention belongs to the technical field of appliances and particularly relates to a method for removing copper, manganese, iron, calcium and magnesium from a cobalt salt solution through a three-section extraction method. The method for removing copper, manganese, iron, calcium and magnesium from the cobalt salt solution through the three-section extraction method is characterized in that during first-section extraction, p204 extract liquid is used for extracting calcium, copper, manganese, zinc and iron out; and 0.6 N-1.0 N of hydrochloric acid liquid and 0.6 N-1.0 N of nitric acid liquid are selected, the washing level is 4 to 6, the water phase flow is stopped till outlet 1-2 levels of water phases are kept free of the obvious red color, the PH of a washing water outlet is 3.0 to 4.0, and anti-iron liquid is 6N HCl. The method for removing copper, manganese, iron, calcium and magnesium from the cobalt salt solution through the three-section extraction method has the beneficial effects that the technology is simple and reliable, the equipment investment is saved, the impurity separating and removing effect is good, the production efficiency is high, and the environment cannot be polluted.

Description

technical field [0001] The invention belongs to the technical field of appliances, and in particular relates to a method for removing copper, manganese, iron, calcium and magnesium from a cobalt salt solution by using a three-stage extraction method. Background technique [0002] The cobalt concentrate and cobalt concentrate are leached, iron removed, or calcium and magnesium removed by reagent precipitation, and the pH is adjusted to 4.5~5.0. After p204 extraction and p507 separation of cobalt and nickel magnesium, the cobalt sulfate solution obtained by back extraction or In cobalt nitrate solution or cobalt chloride solution, the impurities Cu, Mn, Fe, and Mg generally can only reach about 0.004g / L, that is, Co / Me (Me is metal impurity) ≥ (20000~25000): 1, and the production of battery grade Cobalt salt generally requires Co / Me≥25000:1 or higher. In order to improve the purity of cobalt salt, the conventional method is to reduce the impurity content of the feed liquid bef...

AI Technical Summary

Problems solved by technology

[0002] The cobalt concentrate and cobalt concentrate are leached, iron removed, or calcium and magnesium removed by reagent precipitation, and the pH is adjusted to 4.5~5.0. After p204 extraction and p507 separation of cobalt and nickel magnesium, the cobalt sulfate solution obtained by back extraction or In cobalt nitrate solution or cobalt chloride solution, the impurities Cu, Mn, Fe, and Mg generally can only reach about 0.004g / L, that is, Co / Me (Me is metal impurity) ≥ (20000~25000): 1, and the production of battery grade Cobalt salt generally requires Co / Me≥25000:1 or higher. In order to improve the purity of cobalt salt, the conventional method is to reduce the impurity content of the feed liquid before extraction. For example, Fe, Ca, and Mg in the feed liquid are all up to 0.00*g / Below L, one is to increase the number of extraction and washing stages of the extraction line to improve the purity of the finished product after extraction and separation. Although these two measures can effectively improve product quality and meet the quality requirements for battery-grade cobalt salt production, but one is High production cost, large investment in equipment, first, low metal yield