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Cadmium removal from zinc sulfate solution
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Kiandra Buddhi
Cadmium removal from zinc sulfate solution
Add copper sulfate according to Cu2+: Cd2+=1:3. Add zinc powder at 2-2.5 times of the theoretical amount of copper and cadmium. The particle size of the zinc powder is about 150 meshes. The reaction time is 20-30 minutes. Press the filter quickly. Add zinc powder properly during the filter pressing process to prevent re dissolution.
Add copper sulfate according to Cu2+: Cd2+=1:3. Add zinc powder at 2-2.5 times of the theoretical amount of copper and cadmium. The particle size of the zinc powder is about 150 meshes. The reaction time is 20-30 minutes. Press the filter quickly. Add zinc powder properly during the filter pressing process to prevent re dissolution.More
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Reduce the temperature to 45-50, add copper sulfate and antimony salt, stir for 5-10 minutes, then add zinc powder, control the purification time within 20-30 minutes, and filter in time
Reduce the temperature to 45-50, add copper sulfate and antimony salt, stir for 5-10 minutes, then add zinc powder, control the purification time within 20-30 minutes, and filter in timeMore
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1. Add 15-20Kg copper sulfate to the 80m3 reaction tank and compare it with three or four copper sulfate manufacturers. Copper sulfate with good effect is very important for impurity removal; Different amounts of copper sulfate are tested, and the optimum amount is determined after comparison. 2. The temperature is generally above 90 ° C when removing iron from the medium immersion solution by alum precipitation. When removing impurities, the temperature will be about 80 ° C at the first purification, and about 70-80 ° C at the second and third purification; In actual production, copper sulfate and zinc powder are directly added after filter pressing to remove impurities, and the temperature will not drop to 60 degrees (time can not afford). In fact, the above temperature has less influence on impurity removal than expected
1. Add 15-20Kg copper sulfate to the 80m3 reaction tank and compare it with three or four copper sulfate manufacturers. Copper sulfate with good effect is very important for impurity removal; Different amounts of copper sulfate are tested, and the optimum amount is determined after comparison. 2. The temperature is generally above 90 ° C when removing iron from the medium immersion solution by alum precipitation. When removing impurities, the temperature will be about 80 ° C at the first purification, and about 70-80 ° C at the second and third purification; In actual production, copper sulfate and zinc powder are directly added after filter pressing to remove impurities, and the temperature will not drop to 60 degrees (time can not afford). In fact, the above temperature has less influence on impurity removal than expectedMore
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Sectional control is more conducive to the reduction of zinc powder. Before purification, our company has 500-700mg/l cadmium, 1.3mg/l germanium and few other impurities. One ton of zinc only needs 20kG zinc powder
Sectional control is more conducive to the reduction of zinc powder. Before purification, our company has 500-700mg/l cadmium, 1.3mg/l germanium and few other impurities. One ton of zinc only needs 20kG zinc powderMore
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Suggestion 1. Determine the effective zinc content and mesh size of zinc powder 2. The reaction temperature of the solution is 50-60 ° C. 3. Add copper sulfate (with good quality). 4. The reaction takes about 30 minutes. 5. The filter pressing must be rapid to avoid cadmium back dissolution. 6. Eliminate muddling
Suggestion 1. Determine the effective zinc content and mesh size of zinc powder 2. The reaction temperature of the solution is 50-60 ° C. 3. Add copper sulfate (with good quality). 4. The reaction takes about 30 minutes. 5. The filter pressing must be rapid to avoid cadmium back dissolution. 6. Eliminate muddlingMore
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