Flocculants for the production of titanium dioxide

The present invention is directed to a method of recovering titanium dioxide by the sulphate process, in which a titaniferous feedstock with sulfuric acid, from which in further downstream process steps titanium dioxide is recovered to obtain a solid-containing digestion solution (black solution), in which, before feed to the further process steps, the sedimented solids from the digestion solution and separated to yield a substantially solid-free digestion solution (black solution), whereby the solids are flocculated by a flocculant and a coagulant in the sedimentation wherein the flocculation agent is a cationic polymer includes base of aminoalkyl (meth) acrylamide and / or aminoalkyl (meth) acrylate, and the coagulant is a cationic polymer poly-diallyl dimethyl ammonium chloride (poly-DADMAC) base contains, as well as for this method geeigne te Kombinationsflockungshilfsmittel.