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Full-wet process for extracting high-purity zinc from waste galvanized sheet

A galvanized sheet and all-wet process technology, which is applied in the field of all-wet process, can solve the problems of difficulty in obtaining high-purity zinc powder, high equipment requirements, and low production efficiency, and achieve low production costs, low production energy consumption, and waste little effect

Inactive Publication Date: 2020-11-03
湖南绿色再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process has high energy consumption, low production efficiency, high equipment requirements, and it is difficult to obtain high-purity zinc powder

Method used

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  • Full-wet process for extracting high-purity zinc from waste galvanized sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] see figure 1 , Wash the waste galvanized sheet with water first, and then soak the waste galvanized sheet in 3% degreasing agent for 2 hours, and the solution temperature is 40°C. After degreasing, rinse with clean water once, and immerse the waste galvanized sheet in dilute sulfuric acid. The pH value of dilute sulfuric acid is about 1. The reaction time is 3 hours, and the pH value of the leaching end point is 4. Add 1.2 times the theoretical amount of industrial product hydrogen peroxide with a solute mass fraction of 30%, and stir thoroughly for 0.5 h. Then add phosphoric acid whose mass fraction of solute is 10% in an amount 1.5 times of the theoretical amount, and the reaction time is 1.0 h. After the phosphoric acid iron removal reaction is completed, the solution is filtered, and the filtrate is transported to the enrichment tank. Add 1.5 times the theoretical amount of Na to the enrichment tank 2 CO 3 Solid, and constantly stirring, the speed is 50r / min, th...

Embodiment 2

[0065] Wash the waste galvanized sheet with water first, and then soak the waste galvanized sheet in 3% degreasing agent for 2 hours, and the solution temperature is 50°C. After the degreasing is finished, rinse it once with clear water, immerse the waste galvanized sheet in dilute sulfuric acid, the pH value of dilute sulfuric acid is 1, the reaction time is 1h, and the pH value of the leaching end point is 4. Add 1.2 times the theoretical amount of industrial product hydrogen peroxide with a solute mass fraction of 30%, and stir thoroughly for 0.5 h. Then add phosphoric acid whose mass fraction of solute is 10% in an amount 1.5 times of the theoretical amount, and the reaction time is 1.0 h. After the phosphoric acid iron removal reaction is completed, the solution is filtered, and the filtrate is transported to the enrichment tank. Add 1.5 times the theoretical amount of Na to the enrichment tank 2 CO 3 Solid, and constantly stirring, the speed is 50r / min, the reaction t...

Embodiment 3

[0067] Wash the waste galvanized sheet with water first, and then soak the waste galvanized sheet in 3% degreasing agent for 2 hours, and the solution temperature is 50°C. After the degreasing is finished, rinse it once with clear water, immerse the waste galvanized sheet in dilute sulfuric acid, the pH value of dilute sulfuric acid is 1, the reaction time is 3 hours, and the pH value of the leaching end point is 4. Add 1.2 times the theoretical amount of industrial product hydrogen peroxide with a solute mass fraction of 30%, and stir thoroughly for 0.5 h. Then add phosphoric acid whose mass fraction of solute is 10% in a theoretical amount of 1.1 times, and the reaction time is 1.0 h. After the phosphoric acid iron removal reaction is completed, the solution is filtered, and the filtrate is transported to the enrichment tank. Add 1.5 times the theoretical amount of Na to the enrichment tank 2 CO 3 Solid, and constantly stirring, the speed is 50r / min, the reaction time is ...

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Abstract

The invention discloses a method for recovering zinc in a waste galvanized sheet. The method comprises the following steps: a, reacting the waste galvanized sheet with an acid solution to dissolve zinc in the waste galvanized sheet in a leaching solution in a zinc salt form; b, enabling the leaching solution to react with an oxidizing agent, enabling a reaction product to react with phosphoric acid to enable ferrous iron in the leaching solution to form ferric phosphate precipitate, and removing the ferric phosphate precipitate to obtain a primary pure solution; c, reacting the primary pure solution with carbonate to obtain zinc carbonate precipitate; d, reacting the zinc carbonate precipitate with dilute sulfuric acid to obtain a zinc sulfate solution; and e, carrying out electrodeposition on the zinc sulfate solution to obtain the high-purity zinc.

Description

technical field [0001] The invention relates to the field of resource recycling, in particular to an all-wet process for extracting high-purity zinc from waste galvanized sheets. Background technique [0002] At present, with the rapid development of my country's economy and society, the demand for galvanized sheets in the construction industry, automobile industry, and home appliance industry is increasing. Due to the advantages of corrosion resistance, relatively low cost, and good physical and chemical properties, galvanized sheets are widely used in all areas of life. The focus of recycled zinc recovery is the zinc on waste galvanized steel sheets, especially the automobile industry and the home appliance industry. These two industries produce a large amount of galvanized sheets in the process of manufacturing products, and at the same time produce a large amount of leftovers. These leftovers and waste Galvanized sheet has become a huge raw material for our secondary zin...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B19/20C25C1/16
CPCC22B7/007C22B19/22C22B19/26C25C1/16Y02P10/20
Inventor 欧聪陈龙王九飙周文斌朱鹏石秋成
Owner 湖南绿色再生资源有限公司
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