C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/87
C01F 7/76 (2006.01) C01F 7/74 (2006.01) C02F 1/52 (2006.01)
Patent
CA 1203665
ABSTRACT The present invention relates to a method for preparing a basic alum- inium sulphate of the general formula [A?(OHx) (SO4)y (H2O)z] n where n is an integer x is 0.75 - 1.5; y is 0.7 - 1.07; x+2y is 3; and z is 1.5-4; whereat z is < 4 when the product is in solid form, and z is >4 when the product is in the form of an aqueous solution. The compound produces positively charged complexes having charge-neutralizing properties in systems containing suspended or colloidal, negatively charged particles. When carrying out the method an aluminium sul- phate is reacted with a compound from the group CaO, Ca(OH)2, BaO, Ba(OH)2, SrO and Sr(OH)2 to form the above compound. The sulphate formed is then sep- arated. Since the product is poor in sulphate, it can be used to advantage in paper-making industries employing closed pulp-water systems, to reduce the undesirable accumulation of sulphate ions.
406499
Gunnarsson Knut L.
Nilsson Rolf O.
Boliden Aktiebolag
Fetherstonhaugh & Co.
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