Method for preparing battery-grade cobalt sulfate and high-purity germanium dioxide from white metal

Abstract

The invention discloses a method for preparing battery-grade cobalt sulfate and high-purity germanium dioxide from white alloy. In the method, an oxidant is added to the white alloy to carry out oxidative leaching to obtain a first leaching slurry; The second leaching slurry is obtained by controlling the first leaching slurry to perform self-reduction at a value of 0 to 5; the second leaching slurry is subjected to solid-liquid separation to obtain copper-germanium slag; the copper-germanium slag is sequentially subjected to oxidation leaching and germanium precipitation. , solid-liquid separation to obtain germanium concentrate; the germanium concentrate is sequentially subjected to chlorination distillation, rectification and hydrolysis to obtain high-purity germanium dioxide; in this way, the present invention performs oxidation leaching of white alloy under normal pressure, and the production process is safe and efficient. , and the self-reduction property of the white alloy is used, and the white alloy after oxidative leaching is controlled by controlling the reaction temperature and the pH value of the reaction system to complete the self-reduction, avoiding the introduction of new impurities in the reduction process, saving the energy consumption of auxiliary materials, and improving the throughput of the process.

Description

technical field [0001] The invention belongs to the technical field of leaching of white alloys, in particular to a method for preparing battery-grade cobalt sulfate and high-purity germanium dioxide from white alloys. Background technique [0002] White alloy is an alloy material containing cobalt, iron, copper, germanium and other elements. It is widely used in precision instruments, medical equipment, various parts and elastic components in the communication industry and sanitary engineering, daily necessities, etc., so every year At the same time, with the increasing global consumption of cobalt and the relative scarcity of cobalt resources in China, some domestic enterprises have imported cobalt resources from African countries such as the Democratic Republic of Congo and Zambia. The Congolese government has issued a policy of restricting the export of cobalt ore in the country and encouraging the deep processing of cobalt ore into cobalt products before exporting; comp...

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Problems solved by technology

[0002] White metal is an alloy material containing cobalt, iron, copper, germanium and other elements. It is widely used in precision instruments, medical equipment, communication industry, various parts and elastic components in sanitary engineering, daily necessities, etc., so every year At the same time, with the increasing global cobalt consumption and the relative lack of cobalt resources in China, some domestic enterprises have imported cobalt ore resources from Democratic Congo, Zambia and other African countries; and the recent democratic The Congolese government has introduced a policy to restrict the export of cobalt ore in the country and encourage the deep processing of cobalt ore into cobalt products before exporting; companies can only use electric furnaces to smelt cobalt-containing concentrates into cobalt-copper-germanium-iron alloys (white alloys) Afterwards, it was shipped back to China, making a considerable amount of white metal materials to be processed every year in China.

[0003] However, cobalt white alloy has strong corrosion resistance and is difficult to treat. In foreign countries, sulfuric acid pressure leaching or electrolytic treatment is often used, but the metal leaching rate is low.

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