A method and device for combined removal of organic matter and magnesium ions in zinc sulfate solution

Abstract

The invention relates to a method and a device for jointly removing organic matters and magnesium ions in a zinc sulfate solution and belongs to the field of nonferrous metallurgy. The method comprises the following steps: adding the zinc sulfate solution into a device which pressurizes and atomizes to remove organic matters in the zinc sulfate solution; firstly atomizing; then cutting and distributing; finally, strengthening and stirring, continuously feeding oxygen for guaranteeing gas cycle, carrying out full reaction on oxygen and solution and atomized solution; continuously circulating the zinc sulfate solution to remove the organic matters in the zinc sulfate solution; discharging the solution without the organic matters to a concentration tank body through a guide pipe; pressurizing the solution; raising the temperature; then adding sulfate crystal seeds; and concentrating and settling at constant temperature to remove magnesium ions in the zinc sulfate solution. According to the method provided by the invention, the solution is in contact reaction with oxygen, so that the organic matters in the solution are decomposed to generate CO2 and H2 and the organic matters are decomposed and removed, and therefore, the production cost is lowered; the magnesium ions in the solution are removed to avoid zinc deposit residues. The solution without the organic matters and magnesium ions is stable in quality.

Description

technical field [0001] The invention relates to a method for efficiently removing magnesium ions and organic matter in a solution during a zinc hydrometallurgy process, belonging to the field of nonferrous metallurgy, and specifically discloses a method for jointly removing organic matter and magnesium ions in a zinc sulfate solution and its device. Background technique [0002] In the process of hydrometallurgy, if magnesium ions are always running at a high level, it will have a great negative impact on the entire production process, resulting in the inability to increase the zinc content of the new liquid to a normal level, and the output of electrolytic zinc flakes cannot reach a high level. Level, how to excrete magnesium for a long time is a problem that the industry has been concerned about. [0003] In some wet zinc smelting plants abroad, when the zinc sulfide concentrate contains more than 0.6% magnesium, the magnesium is removed by washing with dilute sulfuric ac...

AI Technical Summary

Problems solved by technology

However, these methods are not thorough in removing calcium and magnesium, and membrane dialysis is also used to separate anions and cations, which still cannot effectively separate magnesium and zinc.

[0005] More thorough is the neutralization method for magnesium removal, including electrolytic waste liquid magnesium removal and weak acid leaching slag water washing liquid magnesium removal, but electrolytic waste liquid magnesium removal is due to the high acid content, low zinc content, and low content of valuable metals in the electrolytic waste liquid. As a result, the consumption of lime powder is large during the process of neutralization and magnesium removal, and the cost of slag treatment is high; the method of magnesium removal with weak acid leaching slag washing liquid has a certain amount of valuable metals such as copper and cadmium, which are lost during the magnesium removal process, and additional equipment is required There are also many, and it is not suitable to promote the use of

[0006] In the process of hydrometallurgy, too much organic matter in the solution will affect the solution purification and electrolysis production process, resulting in a decrease in electrolysis current efficiency, an increase in DC energy consumption, and an increase in overall production costs

However, the existing methods for removing organic matter in zinc sulfate solution need to add adsorbents or other additives, and the comprehensive recycling and recovery of adsorbents or additives is difficult, and the overall production cost is high.

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