Process for preparing stable high basicity aqueous solutions of basic aluminium chlorosulphate or basic aluminium chloride

摘要

Process for preparing stable aqueous solutions of basic aluminium chlorosulphate or basic aluminium chloride having a high basicity of 50-65% and high Al₂O₃ title up to 19% by weight, which comprises treating with subdivided metallic aluminium, aqueous solutions having a low basicity of 33-42%, of basic aluminium chlorosulphate or basic aluminium chloride, previously diluted with water and optionally acidified with H₂SO₄, at temperatures of 80°-105°C. The obtained solutions are suitable as coagulants in waters treatment.