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Method for removing calcium from zinc sulfate solution produced by zinc hydrometallurgy

A zinc sulfate solution and wet smelting technology, applied in the field of calcium removal, can solve the problems of increasing the solubility of magnesium, but cannot remove magnesium, etc., and achieve the effects of reducing power consumption, alleviating crystallization, and reducing labor force.

Active Publication Date: 2018-12-28
YUNNAN HUALIAN ZINC & INDIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcium concentration is still high, and at the same time, the solubility of magnesium is increased, which cannot achieve the purpose of removing magnesium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Get 2L of zinc sulfate solution, the temperature of the zinc sulfate solution is 75°C, the concentration of calcium in the zinc sulfate solution is 500mg / L, the concentration of zinc is 170g / L, and the concentration of magnesium is 30g / L. The pH of the zinc sulfate solution was adjusted to 4.0-4.5 with sulfuric acid, 20 ppm of thickener was added to the zinc sulfate solution, and slowly stirred with a glass rod for 2 minutes.

[0045] The zinc sulfate solution is placed in a water bath, and the temperature of the zinc sulfate solution is maintained at 35°C-40°C. After the zinc sulfate solution stayed in the water bath for about 20 hours, the overflow was sent for analysis, and the concentration of calcium in the overflow zinc sulfate solution dropped to 120mg / L.

Embodiment 2

[0047] Get 2L of zinc sulfate solution, the temperature of the zinc sulfate solution is 75°C, the concentration of calcium in the zinc sulfate solution is 500mg / L, the concentration of zinc is 160g / L, and the concentration of magnesium is 30g / L. The pH of the zinc sulfate solution was adjusted to 4.0-4.5 with sulfuric acid, 20 ppm of thickener was added to the zinc sulfate solution, and slowly stirred with a glass rod for 2 minutes.

[0048] The zinc sulfate solution is placed in a water bath, and the temperature of the zinc sulfate solution is maintained at 35°C-40°C. After the zinc sulfate solution stayed in the water bath for about 20 hours, the overflow was sent for analysis, and the concentration of calcium in the overflow zinc sulfate solution dropped to 180mg / L.

Embodiment 3

[0050] Get 2L of zinc sulfate solution, the temperature of the zinc sulfate solution is 75°C, the concentration of calcium in the zinc sulfate solution is 500mg / L, the concentration of zinc is 160g / L, and the concentration of magnesium is 10g / L. The pH of the zinc sulfate solution was adjusted to 4.0-4.5 with sulfuric acid, 20 ppm of thickener was added to the zinc sulfate solution, and slowly stirred with a glass rod for 2 minutes.

[0051] The zinc sulfate solution is placed in a water bath, and the temperature of the zinc sulfate solution is maintained at 35°C-40°C. After the zinc sulfate solution stayed in the water bath for about 20 hours, the overflow was sent for analysis, and the concentration of calcium in the overflow zinc sulfate solution was reduced to 200mg / L.

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Abstract

The invention discloses a method for removing calcium from a zinc sulfate solution of zinc hydrometallurgy production.The method for removing calcium from the zinc sulfate solution of zinc hydrometallurgy production includes the following steps that the zinc sulfate solution is cooled; a thickening agent is added into the zinc sulfate solution, and the pH value of the zinc sulfate solution is adjusted to be 4.0-4.5; the zinc sulfate solution is added into a thickener and stays in the thickener for 5-30 h to obtain calcium-containing bottom flow and spillover flow with calcium removed.By using the method for removing calcium from the zinc sulfate solution of zinc hydrometallurgy production, on the premise of not changing an existing technological process, crystallization of calcium salt in the electrolysis process is greatly relieved, power consumption is reduced, labor force for clearing calcium scale is reduced, and production benefits are increased.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for removing calcium from zinc sulfate solution produced by zinc hydrometallurgy. Background technique [0002] Impurity removal is a necessary process in the zinc hydrometallurgical process. Among the common impurities, calcium sulfate impurities are more difficult to remove because of their special nature. [0003] In the existing zinc hydrometallurgy process, the zinc sulfide concentrate is roasted in a fluidized fluidized furnace to obtain zinc calcine, and calcium exists in the zinc calcine as oxides. When the zinc calcine is leached with the waste electrolyte from zinc electrowinning, calcium Magnesium enters the neutral leaching solution with the leaching of zinc calcine, and the neutral leaching solution undergoes zinc powder replacement purification and impurity removal process to obtain purified zinc sulfate solution (i.e. purified solution), and its temperature is us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/20C22B3/22
CPCC22B3/22C22B19/26Y02P10/20
Inventor 王私富朱北平曹元庆牛辉姚应雄尹华光宋永平张朋李永福农学东张静余文涛杨瑗
Owner YUNNAN HUALIAN ZINC & INDIUM
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