Method for reducing content of Cu, Cd, Ni, Co and Sb in zinc hydrometallurgy zinc sulfate solution

Abstract

The invention relates to the technical field of hydrometallurgy, and especially relates to a method for reducing the content of Cu, Cd, Ni, Co and Sb in a zinc hydrometallurgy zinc sulfate solution. The method comprises the following steps: detecting and recording the content of components in the zinc sulfate solution, and adjusting the pH value of the zinc sulfate solution to 2.5-3.5 to make zinc sulfate meet condition requirement in subsequent purifying technologies, improves the removal rate of Cu, Cd, Ni, Co and Sb elements in zinc sulfate and improve the purity of the zinc sulfate solution; adding a cobalt removal agent in the treatment process, stirring, adding zinc powder, stirring, and filtering to simultaneously remove Cu, Cd, Ni, Co and Sb elements from zinc sulfate in order to reduce the content of impurity elements in zinc sulfate, improve the purity of zinc sulfate, complete the purification process at 50-60DEG C and reduce the energy consumption in the purification process.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for reducing the contents of Cu, Cd, Ni, Co and Sb in zinc sulfate solution in zinc hydrometallurgy. Background technique [0002] In the zinc hydrometallurgy process, the purification and removal of Cu, Cd, Ni, Co, As, and Sb in the ZnSO4 solution is a very important process. The traditional method is to use Zn powder to add 2.5 to 3 times the total amount of Cu and Cd at 50 to 60 ° C for 0.5 to 1 hour to purify, to reach Cu0.1mg / L and below Cd2mg / L as qualified, and then filter Reheat to 80-90℃, add Zn powder according to the sum of Ni and Co content more than 100 times, at the same time add Sb salt 0.6-1 times according to the sum of Co and Ni content, add CuSO4.5H2O 50-100mg / L, to Purify Co and Ni to about 1mg / L. Moreover, when the Co content is high, more than two high-temperature purifications are often required, and the consumption of Zn powder reaches 5...

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Problems solved by technology

Furthermore, for deep purification, it is necessary to use a medium temperature of 70-80°C for the third or fourth Zn powder purification, and use butyl xanthate, β-naphthol, arsenic salt, NaBH4 and other methods to remove Ni and Co, And its purification effect is not as good as the above-mentioned Zn powder-Sb salt method, and it will also cause deterioration of the operating environment and cause environmental pollution

[0003] It can be seen that in the zinc hydrometallurgy process in the prior art, Cu, Cd, Ni, Co, As, Sb in the ZnSO solution are purified and eliminated process procedures are complex, the impurity removal period is long, energy consumption is high, and environmental pollution is serious. High cost of impurity removal, resulting in poor quality products

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