Technique for extracting germanium from germanium-containing material by pressure leaching

Abstract

The present invention relates to a germanium-containing material leaching method and a germanium extracting technique. The method comprises the following steps of adding germanium-containing materials, zinc electro deposited waste liquid, oxygen with the purity of 70-90 percent or oxygen-enriched air into a pressure reactor, controlling leaching temperature and pressure, directly leaching the germanium in the germanium-containing materials, obtaining germanium-containing solution, adding neutralizing agent into the germanium-containing solution to precipitate germanium, controlling temperature and the final pH value, forming high polymer molecules of germanium and iron for coprecipitation, obtaining first-stage enriched slag of germanium, using electro deposited waste liquid containing zinc sulfate to leach the obtained the first-stage enriched slag of germanium, controlling leaching time and temperature to effectively dissolve germanium out, obtaining germanium-enriched leaching solution, having the obtained germanium-enriched leaching solution extracted and reextracted, and obtaining germanium-containing enriched products through enriching once again. The pressurized leaching treatment of germanium-containing materials is a novel smelting method with high efficiency, low consumption and low pollution.

Description

Technical field [0001] The invention belongs to the field of rare metal metallurgy, and more specifically, relates to a method for leaching germanium-containing materials and a germanium extraction technology. Background technique [0002] Germanium is a rare precious metal, and there are few separate deposits. Most germanium is distributed in lead-zinc minerals and coal in a homogeneous or adsorbed state. In the process of polymetallic beneficiation, germanium is mainly enriched in concentrates. [0003] Conventional germanium extraction usually adopts rotary kiln volatilization method or fume furnace volatilization method to enrich germanium in the fume dust, and the germanium-containing fume dust is obtained through leaching, tanning germanium precipitation, and calcination processes to obtain germanium concentrate containing 12% to 30% germanium The disadvantages of the above process are the low direct leaching rate, unreasonable economy, the total direct yield of germanium (...

AI Technical Summary

Problems solved by technology

[0003] Conventional germanium extraction usually adopts rotary kiln volatilization method or fuming furnace volatilization method to enrich germanium into soot, and germanium-containing soot is leached, tannin sinks germanium, and calcined to obtain germanium concentrate containing 12% to 30% germanium The deficiency of above-mentioned technique is that direct leaching rate is low, and economy is unreasonable, and the total direct recovery rate of germanium (from raw material to germanium product) is lower than 60%, and process is longer equipment complexity, investment is big, production cost is higher; cause environmental pollution