Method for separating and purifying crude cuprous telluride slag

Abstract

The invention discloses a method for separating and purifying crude cuprous telluride slag. The method comprises the following steps that oxidation acid leaching is carried out on the crude cuprous telluride slag to remove impurities such as silver, selenium and the like in the crude cuprous telluride slag, then a leaching solution containing copper and tellurium is obtained; and after the pH value and the copper content of the leaching solution are adjusted, the leaching solution is subjected to extraction and reverse extraction operation through a hydroxyl crotch extraction agent, and the copper and the tellurium are separated. According to the method, traditional processes such as repeated acid leaching neutralization and impurity removal are not needed, the tellurium and the copper aredirectly separated through selection of the extraction agent, so that equipment investment is reduced, and the process route is shortened; and according to the method, the problems of high cost and aplurality of pieces of equipment caused by separating the crude cuprous telluride slag through the conventional procedures of acid leaching, neutralization, alkali dissolution, re-neutralization, impurity removal, acid leaching and the like in the prior art can be solved, and the method can reduce the problems of environmental pollution, incomplete separation and the like in the separation process.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for separating and purifying crude cuprous telluride slag. Background technique [0002] Tellurium is a kind of scattered element, which has been widely used as an additive in metallurgy and chemical industry. In addition, tellurium also plays an important role in the preparation of materials such as electronics and optics in modern high-tech fields. Tellurium is often associated with ores such as copper, lead and bismuth, and usually few separate tellurium deposits exist. At present, tellurium is mainly obtained from the by-products produced in the non-ferrous metal smelting process through comprehensive recovery. Copper anode slime and bismuth refining slag are the main sources of tellurium industrial recovery. [0003] Copper anode slime pretreatment methods mainly include sulfated roasting-water leaching process, air-stirred sulfuric acid direct l...

AI Technical Summary

Problems solved by technology

[0004] The existing recovery method of cuprous telluride slag is to realize the separation of copper and tellurium through multiple processes of acid leaching, alkali dissolution, impurity removal, neutralization and alkali dissolution of crude cuprous telluride. The loss of materials in the process is serious, and the waste materials discharged are correspondingly increased, which is easy to cause the waste of raw materials and human resources. The environmental protection problems in the production process are also becoming more and more prominent. The corresponding environmental protection facilities also require a lot of investment, which not only causes environmental protection. It is also not conducive to the control of production costs

There are also reports of direct alkali-dissolution separation of cuprous telluride slag, but in the production process of this process, a large amount of entrainment cannot complete alkali dissolution, and the leaching rate is low, resulting in waste of acid and alkali

[0005] In summary, the current recovery technology of cuprous telluride slag has problems such as long process, low added value of products, low recovery rate, high input cost, and serious waste of resources.