Waste copper sulfate electrolyte purification system and method

Abstract

The invention provides a waste copper sulfate electrolyte purification system and a waste copper sulfate electrolyte purification method realized by using the system. The system comprises a waste electrolyte storage tank, a waste electrolyte pump, a plate filter, a waste filtrate storage tank, a waste filtrate pump, a plate heat exchanger, a vacuum evaporator set, a copper sulfate water cooling crystallization tank, a belt filter and a suction filtration tank which are sequentially connected, wherein the suction filtration tank comprises a tank body; the upper part of the tank body is opened; the middle of the tank body is provided with a pore plate; the tank body is partitioned into a material chamber and a suction filtration chamber by the pore plate; filter cloth covers on the pore plate; the suction filtration chamber is connected with a vacuum pump. According to the invention, devices such as the plate heat exchanger and the like are not easy to scale, so that the safety use of the equipment is ensured; meanwhile, waste electrolyte entering the vacuum evaporator set is low in impurity content, so that the purity of a final product is improved; secondary suction filtration is realized by the suction filtration tank, so that the water and acid contents of a copper sulfate crystal product are effectively reduced, and the quality of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a copper sulfate waste electrolyte purification system and a copper sulfate waste electrolyte purification method using the system. Background technique [0002] During the copper electrolytic refining process, the composition of the electrolyte is constantly changing, the concentration of copper ions is constantly increasing, and impurities are constantly accumulating, while the concentration of sulfuric acid is gradually decreasing. In order to produce qualified quality cathode copper, the concentrations of copper ions, sulfuric acid and impurities in the electrolyte are maintained at Within the specified range, the electrolyte must be purified to remove excess copper and impurities. At present, most of the electrolyte purification adopts the following process: extract a part of the electrolyte or waste electrolyte for evaporation and concentration, and crystallize through coo...

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Problems solved by technology

[0004] (1) Due to the high content of impurities in the waste electrolyte, the fouling problem of the plate heat exchanger is quite serious, resulting in a serious decrease in the heat exchange efficiency of the heat exchanger, and a large number of flakes of calcium, bismuth, tellurium and other compounds can be seen when the plate is cleaned. fouling;

[0005] (2) The suction and filtration effect of the belt filter adopted is not good, and the copper sulfate crystallization product has a large water and acid content. Due to the high free acid content of the copper sulfate crystallization product, the grade rate of the copper sulfate crystallization product is greatly affected

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