Process for removing copper and tellurium from precious bismuth

Abstract

The invention discloses a process for removing copper and tellurium from precious bismuth, and relates to the technical field of removal of the copper and tellurium from the precious bismuth. The process comprises the following steps of S1, carrying out liquation to remove the copper; S2, cooling to remove the tellurium; and S3, mixing to remove the copper. Compared with the prior art CN105803213A, the process for removing the copper and tellurium from the precious bismuth has the advantages that the traditional copper and tellurium removal process is improved, the tellurium is firstly removedand then the copper is removed by cooling, copper slag is independently enriched, the tellurium content in the copper slag is reduced, and the recovery rate of subsequent wet leaching of the copper is increased; According to the process for removing the copper and tellurium from the precious bismuth, sodium nitrate is not used, emission of nitric oxide in the decomposition process of the sodium nitrate is reduced, pollution to the environment is reduced, meanwhile, the cooling waiting time of low-temperature sulfur copper removal is saved, the yield is increased, and the production cost is saved. In a traditional tellurium removal process, compressed air is blown in to be matched with caustic soda flakes, the tellurium removal time is long, and the cost is high. Therefore, the process forremoving the copper and tellurium from the precious bismuth is improved, and the process for removing the copper and tellurium from the precious bismuth has important significance for a bismuth refining system and comprehensive recovery of copper and tellurium metals.

Description

technical field [0001] The invention relates to the technical field of copper and tellurium removal by noble bismuth, in particular to an inventive process for removing copper and tellurium by noble bismuth. Background technique [0002] Copper and tellurium are valuable metals and exist in the form of alloys in noble bismuth alloys. However, in the refining system of bismuth, copper and tellurium are harmful impurity elements. A large amount of copper and tellurium are harmful to subsequent vacuum distillation and bismuth refining. It is a harmful element, so the copper removal and tellurium process of precious bismuth plays an important role in the bismuth smelting system. It must be removed efficiently. [0003] The traditional precious bismuth copper and tellurium removal process is to melt at high temperature first, then lower the temperature to smelt to remove copper, and then add sulfur at low temperature to remove copper; when the copper is removed to the qualified ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides an inventive precious bismuth copper and tellurium removal process, which solves the problem that tellurium is contained in the copper removal slag of the patent application publication number CN105803213A proposed in the above background technology, which affects the subsequent wet and The recovery rate of copper recovered by roasting leads to the repeated circulation of copper in the system, and at the same time it takes a long time to remove tellurium, which increases the cost of recovery

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