A method for separating and extracting selenium and tellurium from a high selenium and low tellurium solution

Abstract

The invention discloses a selenium and tellurium separation and extraction method for a high-selenium low-tellurium solution. According to the method, the high-selenium low-tellurium solution is subjected to reduction in two steps, wherein first-stage reduction is carried out in a first step, sulfur dioxide is added into an initial solution with the chloride ion concentration of 10-20 g / L so as to carry out reduction on selenium in the solution, the sulfuric acid concentration of the solution is controlled in the range of 250-280 g / L, and filtration and separation are carried out after the reduction is carried out for a period of time so as to produce crude selenium and a first-stage reduced solution; and second-stage reduction is carried out in a second step, the chloride ion concentration of the first-stage reduced solution is increased to 60-80 g / L, sulfur dioxide is adopted as a reducing agent, the sulfuric acid concentration of the first-stage reduced solution is controlled to be 280-320 g / L, and filtration and separation are carried out after the reduction is carried out for a period of time so as to produce a selenium-tellurium mixture and a second-stage reduced solution.

Description

Technical field [0001] The invention relates to the technical field of selenium and tellurium extraction, in particular to a method for separating and extracting selenium and tellurium from a high-selenium and low-tellurium solution. Background technique [0002] The selenium and tellurium in the copper concentrate are enriched in the copper refining electrolytic anode slime during the copper smelting process. In the combined treatment process of copper anode slime beneficiation and smelting, after the copper anode slime is chlorinated, some rare metals such as selenium, tellurium, etc. It is separated from precious metals and concentrated in the chlorinated solution, which contains 15-25g / L selenium and 1-3g / L tellurium. The chlorination solution uses sulfur dioxide to reduce the solution to produce crude selenium (75%-85% selenium). The reduced solution contains 0.5-1g / L selenium and about 1-2g / L tellurium. At present, there is no mature process to effectively recover the resi...

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Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a method for separating and extracting selenium and tellurium from a high-selenium and low-tellurium solution, aiming to solve the problem of low selenium and tellurium recovery in the prior art selenium-tellurium extraction method

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