C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
134/37
C02F 5/02 (2006.01) C01F 7/74 (2006.01) C02F 1/52 (2006.01) D21H 17/66 (2006.01)
Patent
CA 1172540
A B S T R A C T The invention relates to an aluminium sulphate composition for water- -purifying, paper-sizing and plant-dewatering purposes, the composi- tion comprising an aqueous solution of aluminium sulphate containing polynuclear complexes of the kind Alm(OH)n3n -n)+ in which m and n are positive integers. The composition has a total aluminium content, Altot, of between about 0.2 and about 2 moles per litre, and is a clear, stable solution up to a content of poly- nuclear complexes which greatly exceeds that previously thought pos- sible. The invention also relates to a method for producing the composition, in which method a carbonate or hydrogen carbonate of alkali metal and an aluminium sulphate is brought into aqueous solution and the amount of carbonate or hydrogen carbonate is so selected in relation to the amount of aluminium sulphate that a given highest mole ratio OH/Al is obtained in the aqueous solution at the desired predeter- mined total aluminium content of the solution.
397460
Boliden Aktiebolag
Fetherstonhaugh & Co.
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