Comprehensive recovery of smelting and smelting - recovery of zinc by acid leaching
This method is used to produce zinc sulfate.
First, the process.
Figure 1.
Figure 1 Flow chart of production process of zinc sulfate heptahydrate
Second, the main technical conditions.
Leaching temperature: 80 ° C, liquid-solid ratio: 4:1, acid consumption is 1.4 to 1.5 times the theoretical amount, residual acid is 15 to 20 g / liter, particle size: -40 mesh, leaching time, 2 hours, manganese powder added The amount is 1∕10 of the amount of slag.
In addition to a purifying heavy metals lead, copper, bismuth: zinc powder, plus twice, each time the amount of slag added in an amount of 3-4%, the purification temperature is higher than 70 ℃, stirring, pH3 ~ 5.
Secondary purification and iron removal: Add potassium permanganate, add 40% of the theoretical amount for the first time, add 30% for the second time, add 40% for the third time, remove the iron to trace amount, boil the solution, stir, pH 3~5.
Evaporation and crystallization: After purification, the solution was evaporated to a density of 1.52 g/cm 3 , and the crystals were cooled, and the crystals were filtered by a centrifuge and dried to be packaged.
Third, the main equipment.
One leaching tank, two purification tanks and one evaporation concentration tank are all made of φ1000×1500 mm enamel reaction kettle: one ball mill ; one jaw crusher : one centrifugal filter.
Fourth, product use.
The product can be used as printing and dyeing mordant, wood and leather preservative, medical emetic, artificial fiber auxiliary material, preventing fruit trees and nursery pests and diseases, agricultural fertilizer, also used in cable and electroplating industry, for producing zinc salt and lithopone, used as Mineral processing agent.
Fifth, product quality.
The first grade contains ZnSO 4 ·7H 2 O≥99%, the free acid is not higher than 0.05%, the water insoluble matter is not higher than 0.02%, the chloride (Cl) is not higher than 0.05%, the iron is not higher than 0.005, the lead is not More than 0.01%; second grade contains ZnSO 4 ·7H 2 O98%, free acid is not higher than 0.1, water insoluble matter is not higher than 0.05%, chloride (Cl) is not higher than 0.2, iron is not higher than 0.01, lead Not higher than 0.05%.
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