Method for removing impurity metallic nickel from crude zinc raw material to obtain zinc-containing solution

Abstract

The invention relates to a method for removing impurity metallic nickel from a crude zinc raw material to obtain a zinc-containing solution. The method includes the steps that (1) sulfuric acid is used for dissolving a crude zinc raw material to prepare a crude zinc solution; (2) a first part of zinc powder is added into the crude zinc solution, sponge cadmium is separated out, and the crude zincsolution obtained after preliminary cadmium removing is obtained; (3) potassium carbonate and a reducible saccharides dissolution inhibitor are added, a reaction is made under the condition that the pH is 4.8-5.8, nickelous hydroxide precipitate is generated, temperature rise is carried out, zinc powder is added again for reacting, cadmium removing is carried out again, and the zinc-containing solution without cadmium and nickel is obtained; and (4) a first part of potassium permanganate is added, a part of ferrous ions in the solution are oxidized into trivalent iron ions, meanwhile, manganese dioxide MnO2 precipitate is formed, hydrogen peroxide is added for reacting, indissolvable cobalt manganate precipitate is formed, temperature rise is carried out, a second part of potassium permanganate is continuously added, a reaction solution shows slight red or light red, then calcium carbonate powder is used for adjusting the pH of the solution to range from 5.0 to 5.8, then temperature rise is further carried out until the red disappears, separation is carried out for removing the precipitate, and the qualified zinc-containing solution obtained after cobalt, iron and manganese removalis obtained.

Description

technical field [0001] The invention relates to a purification process of zinc liquid, in particular to a method for removing impurity metal nickel from crude zinc raw materials by using reducing sugars as a retarding solvent to obtain a zinc-containing solution. Background technique [0002] In the existing production process of zinc sulfate, zinc carbonate, and electrolytic zinc, it is necessary to purify and remove harmful metals such as cobalt, nickel, cadmium, iron, and manganese. In the factory, there are usually processes such as the first cleaning process and the second cleaning process. The crude zinc liquid passes through these purification processes to remove impurity metals, so as to meet the product control requirements. [0003] The existing production of zinc sulfate, zinc carbonate, and electrolytic zinc for intermediate purification to remove cobalt and nickel mainly uses antimony-zinc alloy replacement and sulfuration plus arsenic purification, which needs ...

AI Technical Summary

Problems solved by technology

[0004] 1. Alloy zinc powder is used to replace cobalt and nickel, which is costly

Because the alloy zinc powder is double-layered with the same ion, one is that the amount of expensive alloy zinc powder added is three times the number of moles, so the amount added is large; time consumption;

[0005] 2. There is a sudden safety hazard to the operator

And when it is used for electrolytic zinc solution, nickel and cobalt are difficult to remove, causing the color of zinc carbonate products to turn green and black, which affects the quality of downstream products. When it is used as electrolytic zinc, it is easy to cause The current plate is short-circuited, the plate is burned, and the loss is large

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