Method for extracting and recovering copper and selenium from copper anode sludge by microwave treatment

Abstract

The invention belongs to the field of wet metallurgy, and in particular relates to a method for extracting and recovering copper and selenium from copper anode sludge by microwave treatment. The method specifically comprises the following steps of: screening to remove sandy impurities being more than 5mm in particle diameter from the copper anode sludge; adding sulfuric acid at a concentration of 20 to 500g / L to perform size mixing; controlling the weight concentration of the copper anode sludge size to be 1 to 30%; transferring the copper anode sludge size into a microwave oven; filling or adding an oxidizing agent to the copper anode sludge size; adjusting microwave frequency to be 1,500 to 3,500MHz and microwave heating power to be 120 to 700w; and performing leaching reaction for 1 to 30 minutes under normal pressure, wherein the copper is leached out in a form of CuSO4 from the copper anode sludge, and selenium is ledleaded out in the forms of H2SeO3 and SeSO3 and other forms. By adopting the method, the time of treating the copper anode sludge is shortened; the treatment capacity is increased; the removal rate of copper as well as selenium is raised; the rationality and concentricity of other valuable metals in the copper anode sludge are enabled, thus the comprehensive recovery can be performed well, and the energy consumption is reduced; in addition, special high pressure equipment is saved; and the leaching is performed at a faster speed.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for extracting and recovering copper and selenium from copper anode slime by using microwave treatment. Background technique [0002] When copper is electrolytically refined, the copper on the anode and the base metal with a relatively negative potential dissolve into the solution under the action of direct current, while electropositive metals, such as gold, silver and platinum group metals, do not electrochemically dissolve on the anode, but It falls to the bottom of the tank in a very finely dispersed state and becomes copper anode slime. Copper anode slime contains a large amount of precious metals and rare elements, and is an important raw material for extracting precious metals. In order to better enrich rare and precious metal elements and facilitate the recovery of other valuable elements, it is necessary to pretreat the anode slime, that is, to dissociate the no...

AI Technical Summary

Problems solved by technology

In the pyrotechnic process, there are problems such as high energy consumption, poor operating environment and environmental pollution in the roasting process, which is still a technical problem; and the atmospheric acid leaching copper removal process can not produce sulfur dioxide, but due to the reaction temperature of the air oxidation method It cannot be very high (up to 90°C), so the reaction intensity is weak and the reaction time is long. It takes 24 hours or even longer to complete the decopper task, and the decopper and selenium rates are low, and the decopper rate is only 60~ About 70% and the selenium removal rate is less than 30%

[0004] In order to solve the problems of slow reaction speed, low efficiency and long time consumption in the process of atmospheric pressure acid leaching to remove copper and selenium, the high temperature and pressure acid leaching process has gradually attracted attention.

The high-temperature pressurized method has the advantages of short processing time, large processing capacity, and fast leaching speed, but there are also disadvantages such as high energy consumption and high equipment requirements.

While the leaching rate of the target element increases, the leaching rate of various associated elements also increases, which is not conducive to the recovery of other elements.