Basic aluminium sulphate, its manufacture and use

Details Basic aluminium sulphate, its manufacture and use Basic aluminium sulphate, its manufacture and use

C - Chemistry, Metallurgy

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C01F 7/76 (2006.01) C01F 7/74 (2006.01) C02F 1/52 (2006.01) D21H 17/66 (2006.01)

Patent

CA 1203664

A B S T R A C T The present invention relates to an aluminium sulphate composition having a low sulphate content and being of the type Al(OH)x (SO4)y (H2O)z in which x is 1.5 - 2.0; y is 0.5 - 0.75; x + 2y = 3, and z is 1.5 - 4 when the composition is in solid form. The composition has charge-neutralizing properties in colloidal systems and can be used as a flocculating agent in water-purifying processes, a retention agent in paper-manufacturing processes, and an agent for de-water- ing vegetable material. The product according to the invention enables water to be purified a number of times without requiring appreciable increase in the sulphate-ion concentration.

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