Method for extracting and recovering chromium from cold rolling chromium sludge
A chromium mud and solution technology, applied in the field of solid waste recycling, can solve the problems of high extraction cost, high processing cost, pollution, etc., and achieve the effects of improving chromium recovery rate, saving disposal cost, and increasing added value
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Embodiment 1
[0024] The components and weight percentages of cold-rolled chrome mud are as follows: 50% Cr(OH) 3 , 30% Ca(OH) 2 , 10% water, 10% non-reactive metal compounds.
[0025] 1) Weigh 50g of cold-rolled chrome sludge and place it in 1L of concentrated hydrochloric acid with a concentration of 30% by weight, stir for 40min and then let it stand for 2h, then filter to remove the precipitate therein, and the filtered solution is for subsequent use;
[0026] 2) Add 5g Zn powder to the solution obtained in step 1), stir the solution, and under the action of Zn powder, trace inactive metals such as Cu Pb in the cold-rolled chromium mud are precipitated, and after standing for 40min, the solution is filtered to remove impurities , the filtered solution is for subsequent use;
[0027] 3) Add 1mol / L NaOH to the solution obtained in step 2), adjust the pH value to 7.5, and then bubble CO into the solution 2 Gas and slowly heated, the solution began to become turbid, until the turbidity o...
Embodiment 2
[0031] Components and weight percentages thereof of cold-rolled chromium mud are as follows: 40% Cr(OH) 3 , 30% Ca(OH) 2 , 20% of water, 10% of non-reactive metal compounds.
[0032] 1) Weigh 50g of cold-rolled chrome sludge and place it in 1L of concentrated hydrochloric acid with a concentration of 20% by weight, stir for 60min and then let it stand for 2h, then filter to remove the precipitate therein, and the filtered solution is for subsequent use;
[0033] 2) Add 3g Zn powder to the solution obtained in step 1), stir the solution, and under the action of Zn powder, trace inactive metals such as Cu Pb in the cold-rolled chromium mud are precipitated, and after standing for 40min, the solution is filtered to remove impurities , the filtered solution is for subsequent use;
[0034] 3) Add 1mol / L NaOH to the solution obtained in step 2), adjust the pH value to 8, and then bubble CO into the solution 2 Gas and slowly heated, the solution began to become turbid, until the t...
Embodiment 3
[0038] Components and weight percentages thereof of cold-rolled chrome mud are as follows: 60% Cr(OH) 3 , 25% Ca(OH) 2 , 10% water, 5 inactive metal compounds.
[0039] 1) Weigh 50g of cold-rolled chrome sludge and place it in 1L of concentrated hydrochloric acid with a concentration of 37% by weight, stir for 50min and then let it stand for 2.5h, then filter to remove the precipitate therein, and the filtered solution is set aside;
[0040] 2) Add 2g Zn powder to the solution obtained in step 1), stir the solution, under the action of Zn powder, trace inactive metals such as Cu Pb in the cold-rolled chromium mud are precipitated, and after standing for 40min, the solution is filtered to remove impurities , the filtered solution is for subsequent use;
[0041] 3) Add 0.8mol / L NaOH to the solution obtained in step 2), adjust the pH value to 7, and then bubble CO into the solution 2 Gas and slowly heated, the solution began to become turbid, until the turbidity of the solutio...
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