Method for extracting germanium from high-impurity low-grade complex zinc oxide powder

Abstract

The invention provides a method for extracting germanium from high-impurity low-grade complex zinc oxide powder, and belongs to the technical field of hydrometallurgical processes. The method comprises the following steps of: under the process conditions that the PH value is 0.5 to 1.5 and the temperature is 55 to 75 DEG C, adding sulfite into aqueous solution of zinc sulfate which contains 8,000to 15,000mg/L iron, 300 to 1,000mg/L Fe<3>, and 30 to 135mg/L germanium so as to convert Fe<3> into Fe<2>, complexing and precipitating the germanium by adopting tannic acid to ensure that the germanium in the aqueous solution of zinc sulfate is subjected to a phase change reaction to form [GeO(C75H52O46)2<2>], pretreating, and calcining in a calcining kiln to obtain a germanium concentrate with the germanium content of between 8 and 22.36 percent which is used for producing germanium series products; and removing iron from solution of zinc sulfate obtained after the separation, and feeding into the conventional electrolytic zinc production system to recover valuable metals such as zinc, cadmium, indium and the like. By the method, the interference of the Fe<3> to a multi-metal recovery system can be effectively avoided, the production cost is reduced, and the smooth production process flow is ensured. The method has great significance for comprehensively recovering and recycling the valuable metals in low-grade high-impurity complex zinc oxide raw materials.

Description

technical field [0001] The invention relates to a method for extracting germanium, in particular to a method for extracting germanium from complex zinc oxide powder with high impurities and low grade, and belongs to the technical field of solid separation. Background technique [0002] Germanium is a rare element widely used in optical fiber, infrared and infrared optics, electronics industry, catalyst, medicine and other fields. Because germanium has special and currently irreplaceable properties, the demand for germanium is increasing year by year. However, germanium resources in the world are relatively scarce, and no independent deposits of germanium have been found. Most of the germanium in the ore is symbiotic with lead and zinc, and the ore with a germanium content of 10g / t has mining value. China is relatively rich in germanium resources, ranking first in the world in reserves. There are more than 30 proven germanium-containing mineral deposits in the country, with ...

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Problems solved by technology

Although large and medium-sized enterprises have high-quality and stable raw material supply, advanced production technology, leading technology equipment and strong technology research and development capabilities, the main metal content of industrial production is finally discharged at 5-10%, and the scattered metal content is at 50-200g/t, other impurities are concentrated in the slag, because of its high recovery cost, it is easy to cau...