Method for recovering and treating chromium from waste chromium electrodeposition solution
A treatment method and electrodeposition technology, applied in the electrolysis process, electrolysis components, cells, etc., to achieve the effect of fast speed and mild conditions
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Embodiment 1
[0007] Take 25.00 mL of waste liquid, add 1.60 mL of concentrated sulfuric acid, mix well, heat to 30°C in a constant temperature heating stirrer, add 0.80 mL of hydrazine hydrate dropwise, and continue the reaction for 8 minutes to complete the reduction reaction. Then slowly add concentrated ammonia water to the reaction solution to completely precipitate trivalent chromium, then filter and wash the precipitate and dissolve it with an appropriate amount of concentrated sulfuric acid, evaporate and dry to obtain Cr 2 (SO 4 ) 3 Crystal, the recovery rate of chromium in the waste liquid is 95.2%.
Embodiment 2
[0009] Take 50.00 mL of waste liquid, add 2.80 mL of concentrated sulfuric acid, mix well, heat to 31°C in a constant temperature heating stirrer, add 2.00 mL of hydrazine hydrate dropwise, and continue the reaction for 10 minutes to complete the reduction reaction. Then slowly add concentrated ammonia water to the reaction solution to completely precipitate trivalent chromium, then filter and wash the precipitate and dissolve it with an appropriate amount of concentrated sulfuric acid, evaporate and dry to obtain Cr 2 (SO 4 ) 3 Crystal, the recovery rate of chromium in the waste liquid is 94.8%.
Embodiment 3
[0011] Take 100.00 mL of waste liquid, add 7.00 mL of concentrated sulfuric acid, mix well, heat to 32°C in a constant temperature heating stirrer, add 3.20 mL of hydrazine hydrate dropwise, and continue the reaction for 12 minutes to complete the reduction reaction. Then slowly add concentrated ammonia water to the reaction solution to completely precipitate trivalent chromium, then filter and wash the precipitate and dissolve it with an appropriate amount of concentrated sulfuric acid, evaporate and dry to obtain Cr 2 (SO 4 ) 3 Crystal, the recovery rate of chromium in the waste liquid is 96.6%.
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