75% waste acid reacts with 25% calcium hydroxide
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Our company handles 75% waste sulfuric acid by reacting it with 25% calcium hydroxide to produce calcium sulfate, which is used as an additive in cement production. However, during the trial production phase, it was found that the volume ratio could not be controlled properly, and it failed to meet the standards required for cement production. We would appreciate any advice from experts! ! !
This post was last edited by WJM20100528 on 2012-7-3 09:47. Check the pH value at the end of the reaction for calcium sulfate; it is sufficient to keep it slightly above this pH value.
I’m not sure what process generates the waste acid you have; although it seems simple, calcium sulfate will coat the lime, so care must be taken in designing the method of adding lime slurry and its mixing (where can I find 25% calcium hydroxide?) ）
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The calcium hydroxide mentioned by the poster must be made by adding water to quicklime; it is generally used to control the pH value after treatment. It is important to increase the stirring of the lime slurry during this process; the reason for this was explained on the third floor. Generally, the sludge needs to be removed after some time, and this sludge can be used as a raw material in cement factories
I know that; my factory uses quicklime to neutralize sulfuric acid. After filtration, the wastewater is discharged, leaving behind calcium sulfate. The pH is generally between 7 and 8. It can be picked up by vehicle if needed.
Is this production continuous or batch-based? Thank you.