A treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge
A treatment method, separation and recovery technology, applied to the separation and recovery of copper, iron, zinc, chromium from chromium-containing sludge, and the field of nickel, which can solve the problems of cumbersome steps and high requirements for supporting facilities, so as to reduce the content of chromium , the effect of reducing production
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Embodiment 1
[0036] The chromium-containing sludge in a factory area contains 20% chromium, 10% zinc, 5% Cu, 1% Fe, and 1% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 10%, and the amount of acid added is 400g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 37 mg / m 3 , 4.8g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 49mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 10% sodium hydroxide to the solution to adjust the pH value to 9, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 11, heat a...
Embodiment 2
[0044] The chromium-containing sludge in a factory area contains 15% chromium, 3% zinc, 6% Cu, 2% Fe and 2% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 40%, and the amount of acid added is 100g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 42mg / m 3 , 5.9g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 21mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 10% sodium hydroxide to the solution to adjust the pH value to 10, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 12, heat at ...
Embodiment 3
[0049] The chromium-containing sludge in a factory area contains 5% chromium, 18% zinc, 4% Cu, 1% Fe, and 1% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 20%, and the amount of acid added is 200g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 16mg / m 3 , 3.8g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 24mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 5% sodium hydroxide to the solution to adjust the pH value to 7, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 10, heat at 7...
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