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Zinc recycling method in zinc slag

A zinc slag, a certain amount of technology, applied in the field of zinc recycling, can solve the problem of waste of zinc resources in recycling and utilization

Inactive Publication Date: 2019-11-22
张家港市骏马钢帘线有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the zinc slag with high zinc content and large amount cannot be recycled well, it will cause a great waste of zinc resources

Method used

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  • Zinc recycling method in zinc slag
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for recycling zinc in zinc slag, comprising the following steps:

[0015] S1. Take the zinc slag, add a sulfuric acid solution with a concentration of 500g / L to the zinc slag at room temperature, stir for 60 minutes, and filter; S2. Take the filtrate, let it stand for 60 minutes, and filter again to obtain a high-concentration zinc sulfate solution .

Embodiment 2

[0017] A method for recycling zinc in zinc slag, comprising the following steps:

[0018] S1. get the zinc slag, add the sulfuric acid solution that concentration is 450g / L to the zinc slag under the normal temperature condition, after stirring for 5min, filter;

[0019] S2. Take the filtrate, let it stand for 5 minutes, and then filter again to obtain a high-concentration zinc sulfate solution.

[0020] S3. Take 250ml of the zinc sulfate solution obtained in step S2, add a certain amount of calcium oxide to it, pH=3.0~6.0, at a certain temperature, after fully stirring, let stand for 20-24h, filter to obtain a high-concentration zinc sulfate solution .

[0021] After testing, the resulting zinc sulfate solution situation is as shown in Table 1:

[0022] Table I

[0023] blank 1 2 3 4 Amount of calcium oxide added g 0 0.0521 0.0945 0.1516 0.2142 Ph value (40 minutes) 3.60 4.31 4.45 4.39 4.73 Ph value (24 hours) 3.57 4.38 4.48 4.3...

Embodiment 3

[0027] A method for recycling zinc in zinc slag, comprising the following steps:

[0028] S1. get the zinc slag, add the sulfuric acid solution that concentration is 400g / L to the zinc slag under the normal temperature condition, after stirring for 5min, filter;

[0029] S2. Take the filtrate, let it stand for 5 minutes, and then filter again to obtain a high-concentration zinc sulfate solution.

[0030] S3. Get 2 parts of 250mL of the zinc sulfate solution obtained in step S2, one part does not add hydrogen peroxide, and the other part adds 1ml concentration of 30% hydrogen peroxide, and stirs until fully reacted under normal temperature conditions;

[0031] S4. Add 2 g of calcium oxide to the solution obtained in S3, stir at room temperature for 30 minutes, and filter to obtain a high-concentration zinc sulfate solution.

[0032] Half an hour later, the color of the blank sample changed from colorless and transparent to slightly yellow and turbid, and a large amount of prec...

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PUM

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Abstract

The invention provides a zinc recycling method in zinc slag. The method comprises the following steps that S1, zinc slag is taken, sulfuric acid solution with the concentration of 400-500 g / L is addedinto the zinc slag under the normal temperature condition, stirring is carried out for 5-60 minutes, and filtering is carried out; and S2, the filtrate is taken, standing is carried out for 5-60 minutes, then filtering is carried out again, and the high-concentration zinc sulfate solution is obtained. A large amount of iron ions in the solution can be removed through dissolving the zinc slag by using the sulfuric acid, and the obtained high-concentration zinc sulfate solution can be directly used for electrogalvanizing on an electroplating line.

Description

technical field [0001] The invention relates to the technical field of zinc recycling, in particular to a method for recycling zinc from hot-dip galvanizing slag. Background technique [0002] The amount of zinc consumed for hot-dip galvanizing in the world accounts for about 50% of the total zinc consumption every year, and about 20% of metal zinc forms zinc dross in the hot-dip galvanizing process. Zinc slag is formed when the surface of the zinc melt contacts the atmosphere and is oxidized and floats on the surface of the melt during the hot-dipping process. It is mainly composed of zinc oxide, metal zinc and zinc chloride. Generally, the mass fraction of zinc element in zinc slag is between 50% and 85%. If the zinc slag with high zinc content and large amount cannot be recycled well, it will cause a great waste of zinc resources. Therefore, with the decline of primary zinc ore reserves and the continuous growth of zinc consumption, it is of great significance to carry ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B19/30C22B19/20
CPCC22B7/007C22B7/04C22B19/22C22B19/30Y02P10/20
Inventor 郭琪超
Owner 张家港市骏马钢帘线有限公司