Technology for extracting tellurium dioxide from tellurium-containing smelting slag

Abstract

The invention relates to a technology for extracting tellurium dioxide from tellurium-containing smelting slag. The technology comprises the following steps: ball-milling tellurium slag, leaching by water, carrying out reduction alkali leaching, vulcanizing, carrying out silicon removal purification, and neutralizing to precipitate tellurium. The method has the advantages of tellurium leaching rate improvement, reduction of the alkali application amount in the leaching operation, and production cost reduction. The method is characterized in that sodium hydrosulphite is adopted as a transition agent to transit insoluble high-valence tellurium to low-valence tellurium, so the leaching rate leaching rate is increased. The total tellurium leaching rate can reach above 90% under a suitable technological condition; and after recovering tellurium through neutralizing, the TeO2 grade of the smelting slag can reach above 50%, and the content of tellurium in the waste liquid obtained after the neutralizing is 0.1-0.3g / L. The method also has the advantages of further enrichment of copper, lead, bismuth, antimony and precious metals in the leaching slag, realization of the resource reuse, production cost reduction, and energy saving, and is of great importance to the resource recovery and the environmental protection.

Description

technical field

[0001] The invention relates to a process for extracting tellurium dioxide from tellurium-containing smelting slag, which belongs to the field of nonferrous metal hydrometallurgy and secondary resource recovery. Background technique

[0002] Tellurium, located in the fifth cycle, group VI, is a non-metallic element. Tellurium is a rare element, and its content in the autothermal world is extremely low. According to relevant literature reports, its content in the earth's crust is 0.0006ppm, and it is scattered throughout the earth's crust, making it difficult to form mineral deposits. Tellurium has a wide range of uses, mainly used as alloy additives, brighteners in electroplating solutions, catalysts for petroleum cracking, and protective sleeves for submarine cables. With the development of science and technology, tellurium is more and more widely used in new energy and new materials. Therefore, it is known as "the vitamin of today's industry, national de...

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