Cobalt and magnesium separation method in cobalt nickel wet metallurgy process

Abstract

The invention discloses a cobalt and magnesium separation method in the cobalt nickel wet metallurgy process, and relates to the technical field of metal separation and purification in the cobalt nickel wet metallurgy process. The method comprises the steps that cobalt metal ions in a cobalt containing magnesium solution obtained after extraction impurity removal in the cobalt nickel wet metallurgy process are selectively absorbed through polyvalent metal adsorbent resin, and therefore cobalt and magnesium in the solution are separated. The method further comprises the steps that adsorption saturation polyvalent metal adsorbent resin is subject to reverse analysis treatment to obtain high-concentration cobaltates solution; a magnesium containing solution obtained after cobalt absorbing issubject to alkali blending, precipitation and filtering, and high-purity magnesium hydrate crystals are obtained. Compared with a cobalt and magnesium separation method in the traditional cobalt nickel wet metallurgy process, the method is easy to operate and easy to control, separation of cobalt and magnesium in an acid leaching solution after extraction and impurity removal and high-purity sufficient recycling of cobalt and magnesium can be effectively achieved, the method is environment-friendly, efficient, low in process cost and high in industrial practical value.

Description

technical field [0001] The invention relates to a metal separation and purification method in the cobalt-nickel hydrometallurgy process, in particular to a separation method for magnesium impurity metal and cobalt metal in the cobalt-nickel hydrometallurgy process. Background technique [0002] The cobalt-nickel hydrometallurgy process is the process of separating and purifying cobalt and nickel metals from cobalt-nickel ores or various metal wastes containing cobalt and nickel. It usually consists of three major steps: acid leaching and dissolution-extraction and impurity removal-cobalt and nickel separation composition. With the widespread use of various cobalt-magnesium alloys, most of the acid leaching solutions contain relatively high magnesium metal ion impurities in the process of recycling metal waste for cobalt-nickel hydrometallurgy. Moreover, since the extraction curve of metal magnesium is very close to the extraction curve of cobalt-nickel metal in the process ...

AI Technical Summary

Problems solved by technology

However, because magnesium fluoride itself is a strong base and weak acid salt, on the one hand, the liquid needs to have a higher pH during the magnesium fluoride precipitation process, which will cause a large amount of cobalt or nickel to precipitate into the filter residue, thereby causing cobalt, nickel waste and low recovery efficiency; on the other hand, it is necessary to add an excessive amount of sodium fluoride to completely precipitate the magnesium in the solution, which will cause a large amount of fluoride ions in the final waste liquid. If the standard is less than 5mg / L, the wastewater needs to be treated again, resulting in an increase in process costs