Preparation of aluminium hydroxychlorosulfates based on its sulfate salts

Summary

The results of studies on the synthesis of aluminum hydroxochlorosulfates based on active aluminum hydroxosulfate obtained by the method of low-temperature solid-phase synthesis using (NH₄)2SO₄∙Al2(SO₄)₃∙24H₂O and gaseous NH₃ as starting components are given. The process of interaction of aluminum hydroxosulfate with HCl solutions was studied. By the method of test coagulation it was established that the coagulation ability of aluminum hydroxochlorosulfate sample with a basicity of 2/3 is 10–15% higher compared to solutions of oxychloride and aluminum oxysulfate of the same basicity in the process of removing Cu²⁺ and Co²⁺ ions from water. At the same time its use provides for reducing the consumption of coagulant without impairing the efficiency of removing impurities from water. Besides it was shown that with the use of aluminum hydroxosulfate the sedimentation rate of flocs formed during the coagulation process is 5–10% higher compared to aluminum oxychloride and oxysulfate. This chemical can be used for the purification of both industrial and municipal wastewater.

Key words

water treatment , water treatment , ammonia alum , aluminum hydroxosulfate , hydrochloric acid , aluminium hydroxychlorosulfate