How to dispose of waste hydrochloric acid?
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Resin is used in the company’s production process, and washing the resin generates a large amount of waste hydrochloric acid. How should this acid be disposed of?
1. Neutralize with liquid alkali and discharge directly. 2. Contact small workshops that produce hydrochloric acid to take it away and sell it
Neutralizing with alkalis can be costly, and the reaction is intense, making it uneconomical. Depending on the acid concentration, calcium carbonate powder can be used for neutralization first to see if it’s possible to concentrate the solution and produce crystalline calcium chloride; if that’s feasible, high-quality calcium carbonate can be used for neutralization, and the resulting calcium chloride can be sold； The ordinary ones won’t work; it has to be discharged directly. Additionally, if there are small colored chemical plants in the vicinity that use acid leaching, some of these plants may also employ hydrochloric acid for cleaning filter cloths, allowing for cost-effective treatment.
Neutralizing with alkalis can be costly, and the reaction is intense, making it uneconomical. Depending on the acid concentration, calcium carbonate powder can be used for neutralization first to see if it’s possible to concentrate the solution and produce crystalline calcium chloride; if that’s feasible, high-quality calcium carbonate can be used for neutralization, and the resulting calcium chloride can be sold； The ordinary ones won’t work; it has to be discharged directly. Additionally, if there are small colored chemical plants in the vicinity that use acid leaching, some of these plants may also employ hydrochloric acid for cleaning filter cloths, allowing for cost-effective treatment.
Reply to 4# 147258mch: Thank you; your suggestion is good. I now want to recover this hydrochloric acid for reuse, by using membrane treatment to remove the ions and then reusing it. How should I choose the membrane? And how to design the process route?
Aren’t there many manufacturers claiming to offer hydrochloric acid recovery these days? Ask them.