Comprehensive utilization method of etching waste liquid
A technology for etching waste liquid and filtrate, which is applied in the preparation/separation of ammonia, silicon dioxide, alkali metal fluoride, etc., can solve the problems of inability to carry out secondary cascade application, complex components, and pollute the environment, and achieve environmental protection benefits Significant, simple process, no three wastes discharge effect
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Embodiment 1
[0067] To 100kg of etching waste liquid containing 3% ammonium fluorosilicate, 2.5% ammonium sulfate, 15% ammonium fluoride, 10% ammonium hydrogen fluoride, and the balance is water, add 26.8kg of 17% ammonia water reaction , the reaction temperature was controlled at 40°C, the reaction time was 1h, and the pH at the end of the reaction was 7.5. The obtained reaction solution was filtered to obtain the filtrate (the first filtrate) and the solid (the first solid); the first solid was washed and dried , to obtain 0.99kg of white carbon black.
[0068] To the 121.8kg first filtrate prepared above, add 20.6kg lithium hydroxide, control the reaction temperature to 50°C, stir the reaction for 1h, and filter the obtained reaction product to obtain a filtrate (the second filtrate) and a solid (the second solid ); The second solid matter is washed and dried to obtain 21.1kg lithium fluoride; In the 103kg second filtrate, add 1.3kg white ash and filter after processing, obtain soft wat...
Embodiment 2
[0070] To 100kg of etching waste liquid containing 0.1% ammonium fluorosilicate, 0.1% ammonium sulfate, 10% ammonium fluoride, 3% ammonium hydrogen fluoride, and the balance is water, add 6.5kg mass fraction of 17% ammonia water to react, The reaction temperature was controlled at 50°C, the reaction time was 0.5h, and the pH of the reaction end was 7. The obtained reaction solution was filtered to obtain a filtrate (the first filtrate) and a solid (the first solid); the first solid was washed and dried , to obtain 10 g of white carbon black.
[0071] 10.3kg of aluminum hydroxide was added to the first filtrate of the above 106.3g, the reaction temperature was controlled at 70°C, the reaction was stirred for 0.5h, and the obtained reaction product was filtered to obtain a filtrate (the second filtrate) and a solid (the second solid) With the second solid matter washing, drying, obtain 21.4kg aluminum fluoride; Add 0.06kg white ash to 83.5kg second filtrate and filter after proc...
Embodiment 3
[0073] To 100kg of etching waste liquid containing 5% ammonium fluorosilicate, 5% ammonium sulfate, 25% ammonium fluoride, 15% ammonium bifluoride, and the balance of water, add 26.3kg of 17% ammonia water to react, The reaction temperature was controlled at 30°C, the reaction time was 1.5h, and the end point of the reaction was pH 8. The obtained reaction solution was filtered to obtain a filtrate (the first filtrate) and a solid (the first solid); the first solid was washed and dried , to obtain 1.66kg of white carbon black.
[0074] Add 55.8kg of sodium hydroxide to 120kg of the above-mentioned first filtrate, control the reaction temperature to 40 ° C, stir the reaction for 1.5h, and filter the obtained reaction product to obtain a filtrate (the second filtrate) and a solid (the second solid); The second solid matter is washed and dried to obtain 54.6kg of sodium fluoride; to the second filtrate of 83kg, add 2.55kg of white ash and filter after treatment, the gained soft w...
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