Method for potential-controlled separation and enrichment of tellurium in copper anode slime

Abstract

The invention discloses a method for potential-controlled separation and enrichment of tellurium in copper anode slime. The method comprises the steps of stirring and mixing the copper anode slime and concentrated sulfuric acid according to a center ratio, roasting under different temperature gradients, carrying out ball milling on the roasted product to a required particle size, adding hydrogen peroxide and carrying out oxidation leaching in a dilute sulfuric acid solution in the potential controlling way, adding copper powder to a copper leaching liquid and replacing in the potential controlling way, enriching the tellurium in the replacement residue and recycling copper through carrying out electrodeposition on the replaced liquid. The essence of method disclosed by the invention is that the purposes that the oxidation leaching process and the copper powder replacing process are adjustable and controllable are respectively realized in the potential controlling way; the leaching rates of the copper and the tellurium are respectively up to above 99.0% and above 80.0% in the potential-controlled oxidation leaching process; and the replacement rate of the tellurium in the potential-controlled replacing process is up to above 99.0%. The method disclosed by the invention has the advantages that the technical index in the technical processes is stable; the labour intensity is low; the production cost is low and the like.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method that effectively realizes potential-controlled separation of copper anode mud and enriches tellurium. Background technique [0002] Tellurium is one of the important scattered metals. Due to its special physical and chemical properties, it is widely used in many fields such as metallurgy, chemical industry, petroleum, electronics, electrical, glass ceramics, pigments and medicine, especially telluride has high thermoelectric potential And good photoelectric conversion performance, making the application of tellurium in semiconductor refrigeration parts and solar energy develop particularly rapidly. [0003] Currently, most tellurium is extracted as a by-product of the smelting process of the non-ferrous metals copper and lead. Copper concentrate or lead concentrate with associated tellurium is a by-product of anode ...

AI Technical Summary

Problems solved by technology

However, a domestic company will initially combine copper anode slime and lead anode slime. Due to the high content of copper, selenium and tellurium in copper anode slime, long-term direct smelting treatment will have a negative impact on the entire pyro-smelting system, and there is a recovery rate of precious metals. Therefore, the company has established a kraft roasting pretreatment process for copper anode slime, that is, the copper anode slime is mixed with sulfuric acid and then roasted in a rotary kiln to recover elemental selenium from the roasting flue gas. After the calcined sand is dissolved in copper by sulfuric acid, it is sent to the lead anode mud fire smelting workshop for treatment

[0008] At present, tellurium has not been effectively recovered during the kraftization and roasting pretreatment process of copper anode slime. When the sulfuric acid leaching slag from calcine is directly sent to the lead anode slime smelting workshop, it will bring two problems: first, the recovery rate of tellurium is low, and the tellurium The recovery rate is about 30%; the second is that the increase of tellurium content leads to the extension of refining time, the deterioration of crude silver quality, and the decrease of silver direct yield; based on this, we propose the process of copper anode slime controlled potential separation and enrichment of tellurium Separation and production of tellurium enrichment during copper anode slime pretreatment process

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