Method for selectively leaching rhenium from copper sulfide arsenic residues under normal pressure

Abstract

The invention provides a treating method for selectively leaching rhenium from copper sulfide arsenic residues under the normal pressure. The treatment process of the method includes the steps that firstly, sulfide residues containing copper, arsenic and rhenium are subjected to primary air oxidization and leaching and the leaching pH value is controlled to range from 2 to 5; and secondly, the residues obtained after primary leaching are subjected to secondary leaching, hydrogen peroxide is added to the leaching process for enhancing rhenium leaching, and the leaching pH value in the process is controlled to range from 2 to 5. The leaching conditions are controlled so that the rhenium in the residues can be selectively leached out, the rhenium leaching rate is larger than 90%, the leaching rate of arsenic is controlled within 15%, almost no copper is leached out, and a solution containing 0.3 g / l of rhenium and the total amount of 1 g / l of copper, arsenic and bismuth is obtained. The solution can be extracted so that a rough rhenium salt product can be directly obtained. By the adoption of the method, the process is simple, production cost is far lower than that in the prior art, and the method is easy to implement.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for selectively leaching rhenium from copper sulfide arsenic slag at atmospheric pressure. Background technique [0002] Rhenium is an extremely scarce and dispersed metal element. Minerals containing rhenium are rare in nature, and are mostly associated with molybdenum, copper, lead, zinc, platinum and other minerals in trace amounts, and are difficult to recycle. A large state-owned enterprise's copper output ranks third in the country, but rhenium associated with copper raw materials has been lost due to lack of more economical and reasonable recovery methods. [0003] During the copper smelting process, most of the rhenium associated with copper raw materials is converted into volatile Re 2 o 7 Into the flue gas, during the dust collection process, part of the Re 2 o 7 The condensation exists in the soot, the other part dissolves in the wet dust collection liquid a...

AI Technical Summary

Problems solved by technology

For this part of copper sulfide arsenic slag, there is a process of recovering rhenium by atmospheric pressure leaching in the prior art, but the condition control in the process is not ideal. First, the leaching rate of rhenium is low. Therefore, the process of pressurized oxygen leaching is generally used in the prior art, and then rhenium is recovered from the leaching solution. Since in the process of pressurized oxygen leaching, most of the copper and arsenic are leached except rhenium in the slag, the leaching solution copper arsenic The content is high, causing a large amount of rhenium to be lost in the copper and arsenic purification slag during the process of purifying the leaching solution to remove copper and arsenic, resulting in a very low recovery rate of rhenium; some companies also use pressurized alkaline oxidation to leaching rhenium, similarly a large amount of arsenic is also leached, and the process of removing arsenic is also caused a large loss of rhenium

Moreover, the investment in pressure leaching process equipment and facilities is large, which increases the cost of rhenium recovery.

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