Process for clarification of an impure acidic titanium sulphate liquor and/or the manufacture of titanium dioxide therefrom

摘要: The present invention relates to the manufacture of titanium dioxide wherein sulphate liquor is produced containing colloidal and suspended impurities which are flocculated removed from before obtained by hydrolysis. More particularly it improvement such comprising mixing liquor, prior hydrolysis, with a solution (a) polymer an acrylic acid ester general formula: CH2=CR3COO(CH2)xNR1R2 x 2, 3 or 4, R1 R2 each selected group consisting hydrogen alkyl groups up eight carbon atoms R3 member methyl, (b) water-soluble salt said (c) copolymer ethylenically unsaturated comonomer, (d) comonomer; having molecular weight that viscosity 1 percent aqueous thereof as measured in No. Suspended Level Viscometer at 25* C. least 40 centistokes, comonomer being either extent not more than water-insoluble 15 copolymer.