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
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[0062] Example 1:
[0063] See figure 1 , The waste galvanized sheet is washed with water first, and then the waste galvanized sheet is soaked in 3% degreasing agent for 2h, and the solution temperature is 40℃. After degreasing is finished, rinse it with clean water and immerse the waste galvanized sheet in dilute sulfuric acid. The pH value of the dilute sulfuric acid is about 1, and the reaction time is 3 hours, and the leaching end pH value is 4. Add 1.2 times the theoretical amount of industrial product hydrogen peroxide with a mass fraction of 30% solute, and stir thoroughly for 0.5h. Then add 1.5 times the theoretical amount of phosphoric acid with a solute mass fraction of 10%, and the reaction time is 1.0 h. After the reaction of removing iron from phosphoric acid, the solution is filtered, and the filtrate is sent to the enrichment tank. Add 1.5 times the theoretical amount of Na to the enrichment tank 2 CO 3 Solid, and constantly stirring, rotating speed 50r / min, rea...
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[0064] Example 2:
[0065] The waste galvanized sheet is washed with water first, and then the waste galvanized sheet is soaked in 3% degreasing agent for 2h, and the solution temperature is 50℃. After the degreasing is finished, rinse it with clean water and immerse the waste galvanized sheet in dilute sulfuric acid. The pH of the dilute sulfuric acid is 1, the reaction time is 1h, and the leaching end pH is 4. Add 1.2 times the theoretical amount of industrial product hydrogen peroxide with a mass fraction of 30% solute, and stir thoroughly for 0.5h. Then add 1.5 times the theoretical amount of phosphoric acid with a solute mass fraction of 10%, and the reaction time is 1.0 h. After the reaction of removing iron from phosphoric acid, the solution is filtered, and the filtrate is sent to the enrichment tank. Add 1.5 times the theoretical amount of Na to the enrichment tank 2 CO 3 Solid, and constantly stirring, rotating speed 50r / min, reaction time 1h, get ZnCO 3 precipitation...
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[0066] Example 3:
[0067] The waste galvanized sheet is washed with water first, and then the waste galvanized sheet is soaked in 3% degreasing agent for 2h, and the solution temperature is 50℃. After the degreasing is finished, rinse it with clean water, immerse the waste galvanized sheet in dilute sulfuric acid, the pH of the dilute sulfuric acid is 1, the reaction time is 3h, and the leaching end pH is 4. Add 1.2 times the theoretical amount of industrial product hydrogen peroxide with a mass fraction of 30% solute, and stir thoroughly for 0.5h. Then add 1.1 times the theoretical amount of phosphoric acid with a solute mass fraction of 10%, and the reaction time is 1.0h. After the reaction of removing iron from phosphoric acid, the solution is filtered, and the filtrate is sent to the enrichment tank. Add 1.5 times the theoretical amount of Na to the enrichment tank 2 CO 3 Solid, and constantly stirring, rotating speed 50r / min, reaction time 1h, get ZnCO 3 precipitation. A...
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