Process for purifying waste manganese sulfate solution to reduce content of calcium and magnesium

Abstract

The invention discloses a process for purifying waste manganese sulfate solution to reduce the content of calcium and magnesium. The process comprises the following steps that S1, the manganese sulfate waste liquid containing the calcium and the magnesium are taken, after the waste liquid is heated to 30-40 DEG C, a mixed solution of oxalic acid, sodium oxalate and ammonium oxalate is added, stirring and reaction are performed for 2-4 hours at a constant temperature; S2, the solution obtained after the reaction in the step 1 is allowed to stand, then the precipitate is removed, and then the purified manganese sulfate solution is obtained, wherein the mass ratio of the oxalic acid, the sodium oxalate and the ammonium oxalate in the mixed solution is (2-3) to 1 to 1. According to the scheme,oxalic acid and oxalate solutions are used for removing impurities from manganese sulfate, the method has the advantage that the influence caused by impurity removal utilizing fluoride on the environment in the traditional technology is avoided in the aspect of the technology, the manganese sulfate generated in the wet metallurgy process is purified and reused, and meanwhile, the effects of beingnon-toxic or low-toxic is further achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a process for purifying waste manganese sulfate solution and reducing calcium and magnesium content. Background technique [0002] Hydrometallurgy is the process of contacting ore, concentrated ore enriched by ore dressing or other raw materials with aqueous solution or other liquids, through chemical reactions, etc., so that the useful metals contained in the raw materials are transferred into the liquid phase, and then the metals contained in the liquid phase are transferred to the liquid phase. It is a method of separating and enriching various useful metals, and finally recovering them in the form of metal compounds. Copper and cobalt are two commonly used chemical raw materials, and are usually extracted by hydrometallurgy. After extracting copper, cobalt and other metals in the traditional hydrometallurgical process, a large amount of manganese sulfate solu...

AI Technical Summary

Problems solved by technology

In the prior art, most researchers use fluoride to remove impurities of Ca and Mg ions, but the toxicity of fluoride is harmful to the human body and the environment. Therefore, it is necessary to find a low-toxic or even non-toxic method to reduce manganese sulfate waste. The method of calcium and magnesium ions in liquid is of great significance

Images