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A method for improving the filtration performance of zinc oxide leachate

A technology for filtering performance and leaching solution, which is applied in the field of improving the filtration performance of zinc oxide leaching solution, to achieve the effects of improving solution filtration performance, reducing overall cost, and improving economic and technical indicators

Active Publication Date: 2018-03-09
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly used for water treatment, and it is not suitable for silicon removal in acidic solution and salt solution.

Method used

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  • A method for improving the filtration performance of zinc oxide leachate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add zinc oxide soot mixture containing 1% calcium-aluminum composite desiliconization agent into 1000mL dilute sulfuric acid solution, keep the temperature at 65-80°C, and leaching time for 2.5 hours. The terminal acidity at this time is 1.1g / L , keep the temperature at 70-75°C for natural concentration and clarification for 30 minutes, take the supernatant and filter: natural filtration rate 10mL / min;

[0024] (2) Add zinc oxide dust into 1000mL of dilute sulfuric acid solution, keep the temperature at 65-80°C, and leaching time for 2.5 hours. At this time, the end point acidity is 1.2g / L, keep the temperature at 70-75°C for 30 minutes to concentrate and clarify naturally, take the above Clear filtration: natural filtration rate 5mL / min.

Embodiment 2

[0026] (1) Add the zinc oxide soot mixture containing 2.5% calcium-aluminum composite desiliconization agent into 1000mL dilute sulfuric acid solution, keep the temperature at 65-80°C, and leaching time for 2.5 hours. The terminal acidity at this time is 1.0g / L , keep the temperature at 70-75°C for natural concentration and clarification for 30 minutes, take the supernatant and filter: the natural filtration rate is 16.4mL / min;

[0027] (2) Add zinc oxide dust into 1000mL dilute sulfuric acid solution, keep the temperature at 65-80°C, and leaching time for 2.5 hours. At this time, the end-point acidity is 1.1g / L, keep the temperature at 70-75°C for 30 minutes to concentrate and clarify naturally, take the above Clear filtration: natural filtration rate 5.3mL / min.

Embodiment 3

[0029] (1) Add the zinc oxide soot mixture containing 5% calcium-aluminum composite desiliconization agent into 1000mL dilute sulfuric acid solution, keep the temperature at 65-80°C, and leaching time for 2.5 hours. The terminal acidity at this time is 0.8g / L , keep the temperature at 70-75°C for natural concentration and clarification for 30 minutes, take the supernatant and filter: the natural filtration rate is 17.8mL / min;

[0030] (2) Add zinc oxide dust into 1000mL dilute sulfuric acid solution, keep the temperature at 65-80°C, and leaching time for 2.5 hours. At this time, the end point acidity is 1.0g / L, keep the temperature at 70-75°C for 30min to concentrate and clarify naturally, take the above Clear filtration: natural filtration rate 4.9mL / min.

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Abstract

The invention relates to a method for improving filtration performance of zinc oxide leaching liquid, and belongs to the technical field of nonferrous metallurgy. According to the invention, zinc oxide smoke and a calcium aluminum composite desiliconization agent are mixed and added to a sulfuric acid dilute solution to conduct leaching for a period, and the leaching finish point acidity is kept to range from 0.8g / L to 2.5g / L. In the process of leaching of the zinc oxide smoke, an insoluble compound is generated by Ca2+ and Al3+ in a reaction between silicic acid and the calcium aluminum composite desiliconization agent in the leaching liquid, the content of the silicic acid, affecting filtration, in the solution is reduced, and therefore the filtration performance of the solution is improved. Compared with the prior art, the method has the advantages that an existing zinc oxide smoke leaching technology does not need to be changed, the operation that oxhide gelatin is added to improve the filtration performance of the solution is not required, and therefore the content of organic matter, generated after recycling of tannic acid, in the zinc electrowinning process of the sulfuric acid solution can be obviously reduced, the hazard caused by the organic matter to zinc electrowinning is reduced, the economic and technical indexes of zinc electrowinning are improved, the overall cost of production run is reduced, and the operation is easy and convenient.

Description

technical field [0001] The invention relates to a method for improving the filtration performance of zinc oxide leaching solution, which belongs to the technical field of nonferrous metallurgy. Background technique [0002] Zinc oxide dust usually contains 2-3% silicon. Under acidic leaching conditions, the silicon in the zinc oxide raw material will form a silicic acid colloidal state and enter the solution, resulting in a significant decrease in the filtration performance of the leachate. Normally, the filtration rate (natural filtration rate) of zinc oxide acidic leaching solution is 4-8mL / min. In the recovery process of tannin acid from zinc oxide fume acid leaching solution, in order to improve the grade of germanium concentrate and reduce the consumption of tannin, the concentrated supernatant of zinc oxide acid leaching is filtered first, and then tannin is added. Shen Ge. How to improve the filtration performance of zinc oxide acidic leaching solution is to reduce ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B19/30
CPCY02P10/20
Inventor 罗永光马云川林木勇陈波刘义娟曾国礼
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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