Method for recycling germanium from germanium-containing glass

Abstract

The invention discloses a method for recycling germanium from germanium-containing glass, which comprises the following steps: 1) pulverizing germanium-containing glass into germanium-containing glass powder, adding an alkali solution into the germanium-containing glass powder, heating to 120-300 DEG C, and keeping the temperature for 1-10 hours to obtain a water solution containing sodium silicate and sodium germanate; 2) adding an alkali metal salt into the water solution containing sodium silicate and sodium germanate obtained in the step 1), regulating the pH value to 6-9, aging, carrying out solid-liquid separation, drying the solid to obtain amorphous silicon dioxide, and recycling; 3) adding magnesium chloride into the solution obtained by solid-liquid separation in the step 2) to obtain a precipitate containing magnesium germanate; and 4) mixing the precipitate containing magnesium germanate with hydrochloric acid, carrying out chlorination distillation, condensing to collect germanium tetrachloride, and hydrolyzing the germanium tetrachloride to obtain germanium dioxide. The method abandons the pyrogenic process for recycling high-silicon germanium-containing waste, lowers the energy consumption, reduces the environmental pollution, and has the advantages of simple technique, high germanium recycling rate and low recycling cost.

Description

technical field [0001] The invention relates to a germanium recovery process, in particular to a method for recovering germanium from germanium-containing glass. Background technique [0002] Germanium is an important scattered metal and the most important semiconductor material besides silicon. It has extensive and important applications in various fields such as infrared optics, optical fiber communication, aerospace, chemical catalysts, solar cells, and biomedicine. On the other hand, the resources of germanium in the world are relatively poor. The proven reserves of germanium metal in the world are about 8,600 tons, and the global reserves are only enough for 40 years. Now most developed countries are vigorously developing aerospace technology and new energy technology, and the sustainable development of these technologies is inseparable from the application of germanium. As my country's economy continues to develop at a high speed, the level of science and technology c...

AI Technical Summary

Problems solved by technology

The traditional methods of recovering germanium mainly include: chlorination direct distillation, alkali leaching and alkali roasting, etc., but there are disadvantages such as high energy consumption, heavy environmental pollution, low recovery rate of germanium, and high recovery cost.

The fundamental reason is that the silicon dioxide content in this type of germanium-containing glass is high, and the separation of germanium and silicon is difficult.

Images