Aluminium hydroxycarbonate gel

Abstract From the Canadian patent

Continuous production of aluminium hydroxycarbonate gel by continuous reaction of aluminium salt solution with mixed alkaline carbonate and bicarbonate solution under homogeneous conditions in a relatively small reaction vessel, and continuing the reaction in a subsequent reaction vessel under controlled pH. The product gel is separated from the non-aluminium cation containing reaction mixture within less than about 6 hours whereby, formation of poorly soluble addition reaction products such as dihydroxy aluminium sodium carbonate which, contribute undesired non-aluminium cations to the gel product, is reduced. The aluminium salt solution is adjusted in pH by adding to it a portion of the …