A kind of defluorination agent for zinc sulfate solution and preparation method thereof

Abstract

The invention relates to a defluorination agent for zinc sulfate solution in procedures for smelting zinc by the aid of wet processes and a method for preparing the defluorination agent. The particular method includes carrying out crushing and sieving working procedures and the like on a natural mineral, namely monazite, to allow the monazite to have certain granularity under the control; placing the crushed monazite in acid solution, adding anionic surfactants into the acid solution to obtain mixed solution, shaking the mixed solution, allowing the mixed solution to stand still, aging the mixed solution, then centrifugally separating the mixed solution, repeatedly washing the mixed solution by the aid of deionized water and drying the mixed solution to obtain samples; placing the obtained samples in salt solution, impregnating the samples, sufficiently stirring the samples, allowing the samples to stand still for 10-24 h, carrying out suction filtration on the samples, drying the samples, placing the samples in a high-temperature resistance furnace and calcining the samples at the certain temperatures under the control to obtain the defluorination agent. The defluorination agent and the method have the advantages that processes for preparing the defluorination agent are simple, materials are good in stability, the defluorination agent is good in selective adsorption, high in fluorine adsorption capacity and convenient to apply, impurity introduction can be prevented, and the defluorination agent and the zinc sulfate solution can be easily separated from each other; the defluorination agent can be recycled for extracting rare earth or rare earth fluoride after fluorine is adsorbed.

Description

Technical field: [0001] The invention belongs to the technical field of defluorination in the zinc smelting process, and in particular relates to an adsorbent for defluorination of zinc sulfate solution in the zinc hydrometallurgy industry and a preparation method thereof. Background technique: [0002] At present, the vast majority of zinc in the world is produced by hydrometallurgy technology, but the impurities in it, especially fluorine, will seriously affect production: fluorine ions can corrode electrodes, resulting in increased consumption of plates; Bonding with the cathode aluminum plate makes it difficult to strip zinc from the cathode and prevents the subsequent process from proceeding normally. At the same time, the existence of fluorine will also cause corrosion of equipment and shorten the life of equipment; in addition, fluorine is also a toxic substance, and its existence will also affect the health of workers. A series of hazards caused by excessive fluorid...

AI Technical Summary

Problems solved by technology

But the CeCO described in this method 3 F is unstable in acid solution, and the fluorine removal rate is not high when the fluorine content is low, and the particle size of the fluorine removal agent is too small, which makes the subsequent separation process very difficult, and the cost of removing fluorine directly with pure rare earth compounds is very high

[0005] In summary, this kind of adsorbent has problems such as low fluoride removal rate, low selectivity, and poor filtration performance in the removal of fluoride from zinc sulfate solution, which makes the operation difficult and the enterprise cost is too high. Therefore, it is necessary to find a better defluorination Fluorine agent to reduce the concentration of fluorine in zinc sulfate solution