A method for preparing high-grade germanium concentrate from germanium-containing leaching solution

Abstract

The invention relates to a method for preparing high-grade germanium concentrate from a germanium-containing leaching solution, and belongs to the technical field of hydrometallurgy. The method comprises the steps that the pH value of the germanium-containing leaching solution is adjusted to 2.0-3.5, and a tannin solution with the acidity of 5.0-10.0 g / L is added under the temperature of 50-70 DEGC and stirred for 15-20 min to obtain first tannin-germanium residues after filtering is conducted; 2-4 sections of counter-current washing is conducted on the first tannin-germanium residues by adopting a sulfuric acid solution, and second tannin-germanium residues are obtained after filtering is conducted; the second tannin-germanium residues are dried for 4-8 hours under the temperature of 80-100 DEG C to obtain third tannin-germanium residues; the third tannin-germanium residues are roasted for 3-5 hours under the temperature of 450-600 DEG C to obtain black germanium concentrate. By means of the method, the high-grade germanium concentrate can be prepared, the recovery rate of germanium is 85.0% or above, the germanium content of the germanium concentrate is 35.0%, and the arsenic content of the germanium concentrate is 1.0%; by means of the method, traditional technology process is optimized, the procedures are simple, the recovery rate of the germanium is high, the operation iseasy, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for preparing high-grade germanium concentrate from germanium-containing leaching solution. Background technique [0002] The crude germanium produced in modern industry is mainly recovered from roasted sphalerite, lead-zinc oxide ore and germanium-containing coal soot or soot. When germanium is extracted from these materials, sulfuric acid leaching is generally used first to obtain germanium-containing leachate, and then germanium is precipitated with tannic acid or tannin extract. The germanium concentrate is then chlorinated and distilled to extract the germanium. [0003] At present, the grade requirement for germanium concentrate on the market is above grade five, that is, the content of germanium is required to be above 15.0%, and the content of arsenic to be below 1.5%. There are many raw materials for extracting germanium. If the germanium c...

AI Technical Summary

Problems solved by technology

There are many raw materials for extracting germanium. If the germanium content in the germanium-containing raw material is too low and the impurity elements such as arsenic and iron are high, then the germanium-containing leachate obtained by sulfuric acid leaching has a low germanium content and a high impurity content. The arsenic content in the germanium concentrate produced by Ningshen Germanium exceeds the standard, and the content of other impurities is also high. The grade of the germanium concentrate is low, making it difficult for the quality of the germanium concentrate to meet the market demand.