Method for extracting refined tellurium from tellurium-contained smelting slag

Abstract

The invention relates to a method for extracting refined tellurium from tellurium-contained smelting slag, which is characterized in that the method comprises the following steps of: oxidizing and leaching inorganic acid, replacing noble metal with a copper plate, depositing the copper by sodium sulfide, counteracting and depositing tellurium, alkaline leaching coarse TeO2, removing impurities by Na2S, concentrating and electrowinning. The method has the advantages of high recovery rate for tellurium, comprehensive and effective recovery of other useful metals, and suitably treating the tellurium-contained waste slag with high water content and small granularity generated in the metallurgy process by a wet-method.

Description

Technical field [0001] The invention relates to a method for extracting refined tellurium from tellurium-containing smelting slag. technical background [0002] The No. 52 element tellurium belongs to the group VI oxygen group element in the periodic table of elements, and its nature is a semi-metal, and its content in nature is extremely low. According to relevant literature reports, its content in the crust is 0.0006ppm, and it is dispersed in various parts of the crust. It is difficult to form ore deposits, but tellurium has a wide range of uses, such as additives in iron and steel metallurgy, protective sleeves for submarine cables, vulcanizing agents in the rubber industry, and catalysts in petrochemical industries. In recent years, with the development of science and technology, tellurium has been widely used in new energy and new materials, such as new energy battery cadmium-tellurium battery, new computer storage materials, photoelectric conversion film of TV camera ...

AI Technical Summary

Problems solved by technology

For the tellurium-containing by-products produced by wet production, when this method is used, the volatilization of tellurium is relatively large, the loss rate is high, and the energy consumption is high

[0004] Second, it consumes a lot of alkali

In the alkaline leaching process, other impurities such as antimony, arsenic, silicon, etc. are likely to enter the leaching solution together with tellurium, which not only consumes a large amount of alkali, but also requires purification and removal of impurities to meet the requirements for the production of tellurium dioxide, which increases the operating procedures and costs.

[0005] Third, the leaching rate of Te is low, generally 60-70%.

Unleached tellurium is dispersed in the products of subsequent smelting processes, and it is difficult to recover because its content is too low, and a certain amount of Te has been lost in the acid leaching solution in the acid leaching decopper process before alkali leaching, making the total recovery of tellurium low rate

[0006] Because of the above reasons, the recovery rate of tellurium is not high in the process of using traditional methods to process tellurium-containing materials. For example, the recovery rate of tellurium is generally about 50% in the process of sulphating and roasting copper anode slime to treat copper anode slime. Tellurium exists in various waste slags and wastes in the treatment process of smelters. Tellurium exists in various forms and grades in such wastes, which increases the difficulty of further recovery of tellurium. Therefore, the development of comprehensive recovery of tellurium from tellurium slag The process is of great significance

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