What are the recycling methods of sulfuric acid

What are the recycling methods of sulfuric acid

Waste industrial grade sulfur wastewater contains a large amount of metal ions and organic impurities, which pollutes the environment very much. Therefore, it needs to be strictly treated until it meets the relevant standards before discharge. The treatment methods of waste acid mainly include: concentration method, extraction method, oxidation method and crystallization method; concentration method also includes high temperature concentration method and low temperature concentration method.

According to the differences in the composition and treatment objectives of waste acid, the treatment methods currently used at home and abroad can be roughly divided into three categories: recycling, comprehensive utilization and neutralization treatment.

If the main component of waste acid is sulfuric acid, it can be recovered and reused after being treated by concentration method, extraction method, oxidation method and crystallization method. The treatment process is to remove the impurities in the waste industrial grade sulfur, and at the same time enrich the sulfuric acid.

Concentration method is in the process of heating and concentrating waste dilute sulfuric acid, so that the organic matter in it undergoes a series of reactions such as oxidation and polymerization, and transforms into dark gelatinous matter or suspended matter, which is then removed by filtration, so as to achieve the dual purpose of removing impurities and concentrating dilute sulfuric acid. Purpose. The heating process of the high-temperature concentration method uses a high-temperature heat carrier at a temperature of 180-210°C, which can convert organic matter into a non-sticky substance, and then remove it by filtration.