Method for efficiently separating and recovering tellurium from copper anode mud copper separation slag

Abstract

The invention belongs to the field of hydrometallurgy in non-ferrous metallurgy, and particularly relates to a method for efficiently separating and recycling tellurium from copper anode mud copper separation slag, which effectively realizes efficient separation of tellurium in copper anode mud copper separation slag. According to the method, the efficient leaching process of tellurium in the copper anode mud copper separation slag is realized by adopting a hydrochloric acid oxidation system, the tellurium leaching rate is more than 90%, the gold leaching rate is 99% or above; gold in the solution is preferentially reduced and precipitated by uniformly and slowly adding a weak reducing agent, the gold precipitation rate is 99% or above, and tellurium basically does not precipitate; then platinum and palladium in the solution are reduced and precipitated by uniformly and slowly adding a weak reducing agent, and the concentration of gold, platinum and palladium ions in the platinum and palladium reduced solution can be reduced to 0.001 g/L or below; and a reducing agent is added into the platinum and palladium reduced solution to deeply reduce and precipitate tellurium, the quality of the obtained crude tellurium powder is 95% or above, and the tellurium recovery rate is 90% or above. The links are closely associated and jointly act to realize efficient separation and recovery ofgold and tellurium in the copper separation slag. The method has the advantages of stable process technical indexes, low labor intensity, low production cost and the like.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy in nonferrous metallurgy, in particular to a method for efficiently separating and recovering tellurium from copper anode slime and copper slag, which can effectively realize the efficient separation of tellurium from copper anode slime and copper slag. Background technique [0002] Tellurium is an important scattered metal. Due to its unique physical and chemical properties, it has extensive and important applications in the fields of semiconductor devices, refrigeration components, photoelectric components, and special alloys. It has a prominent position in national defense, aerospace, and energy and chemical industries. [0003] Tellurium mainly exists in the form of heavy metal associated ore, which is produced as a by-product in the heavy metal extraction process. The main associated ore is copper ore. The usual copper ore smelting process is that copper concentrate is followed by pyro-smelting,...

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Problems solved by technology

[0008] Tellurium is an amphoteric compound, which can be dissolved in acid and alkali in theory, but in production practice, the leaching effect of tellurium in sulfuric acid and alkali solution is not ideal, and the leaching rate of tellurium is low in the process of separating tellurium in the pretreatment of copper anode slime. Difficulty in separation and recovery

According to current reports, the comprehensive recovery rate of tellurium in copper anode slime in copper smelting enterprises is less than 60%, and some enterprises are even below 40%.

Although these processes can improve the leaching rate of tellurium in the copper anode slime base metal separation process to a certain extent, there are problems such as long process flow, complicated operation, high equipment requirements, and high production costs, and there are difficulties in industrial promotion.

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