Process for manufacturing white pigment containing products, characterised in that said process comprises the following steps: a) providing at least one white pigment and impurities containing material; b) providing at least one collector agent selected from the group consisting of compounds of formula: R 1 is selected from the group consisting of a direct bond, an alkylene radical having from 1 to 10 carbon atoms, a substituted alkylene radical, wherein said alkylene radical is substituted by 1 or 2 -OH groups, a cycloalkylene group, a cycloalkenylene group and an arylene group; R 2 is selected from the group consisting of a hydrocarbyl group having from 8 to 24 carbon atoms or a group of formula R 4 -O-(A'O) w -T-, wherein; R 4 represents a hydrocarbyl group having from 8 to 24 carbon atoms; w is a number within the range from 0 to 20; A'O is an alkyleneoxy group having from 2 to 4 carbon atoms; and T represents an alkylene group having from 1 to 6 carbon atoms; R 3 is selected from the group consisting of a hydrocarbyl group or a benzyl group; AO represents an alkyleneoxy group having from 2 to 4 carbon atoms; X represents an anion derived from an alkylating agent R 3 X; x is a number within the range from 1 to 20; p is a number within the range from 1 to 15; t is 0 or 1; y is 0 or 1; and G represents a group of formula; wherein; B represents an alkyl group having from 1 to 4 carbon atoms or represents a benzyl group; s is 1, 2 or 3; R 3, X and t are as defined above; N + is connected to R 2 in formula; and (CH 2) s is connected to the quaternary nitrogen atom in formula; c) mixing said white pigment and impurities containing material of step a) and said collector agent of step b) in an aqueous environment to form an aqueous suspension; d) passing gas through the suspension formed in step c); e) recovering the white pigment containing product by removing the white pigment bearing phase from the aqueous suspension obtained after step d). a) providing at least one white pigment and impurities containing material; b) providing at least one collector agent selected from the group consisting of compounds of formula: R 1 is selected from the group consisting of a direct bond, an alkylene radical having from 1 to 10 carbon atoms, a substituted alkylene radical, wherein said alkylene radical is substituted by 1 or 2 -OH groups, a cycloalkylene group, a cycloalkenylene group and an arylene group; R 2 is selected from the group consisting of a hydrocarbyl group having from 8 to 24 carbon atoms or a group of formula R 4 -O-(A'O) w -T-, wherein; R 4 represents a hydrocarbyl group having from 8 to 24 carbon atoms; w is a number within the range from 0 to 20; A'O is an alkyleneoxy group having from 2 to 4 carbon atoms; and T represents an alkylene group having from 1 to 6 carbon atoms; R 3 is selected from the group consisting of a hydrocarbyl group or a benzyl group; AO represents an alkyleneoxy group having from 2 to 4 carbon atoms; X represents an anion derived from an alkylating agent R 3 X; x is a number within the range from 1 to 20; p is a number within the range from 1 to 15; t is 0 or 1; y is 0 or 1; and G represents a group of formula; wherein; B represents an alkyl group having from 1 to 4 carbon atoms or represents a benzyl group; s is 1, 2 or 3; R 3, X and t are as defined above; N + is connected to R 2 in formula; and (CH 2) s is connected to the quaternary nitrogen atom in formula; R 1 is selected from the group consisting of a direct bond, an alkylene radical having from 1 to 10 carbon atoms, a substituted alkylene radical, wherein said alkylene radical is substituted by 1 or 2 -OH groups, a cycloalkylene group, a cycloalkenylene group and an arylene group; R 2 is selected from the group consisting of a hydrocarbyl group having from 8 to 24 carbon atoms or a group of formula R 4 -O-(A'O) w -T-, wherein; R 4 represents a hydrocarbyl group having from 8 to 24 carbon atoms; w is a number within the range from 0 to 20; A'O is an alkyleneoxy group having from 2 to 4 carbon atoms; and T represents an alkylene group having from 1 to 6 carbon atoms; R 4 represents a hydrocarbyl group having from 8 to 24 carbon atoms; w is a number within the range from 0 to 20; A'O is an alkyleneoxy group having from 2 to 4 carbon atoms; and T represents an alkylene group having from 1 to 6 carbon atoms; R 3 is selected from the group consisting of a hydrocarbyl group or a benzyl group; AO represents an alkyleneoxy group having from 2 to 4 carbon atoms; X represents an anion derived from an alkylating agent R 3 X; x is a number within the range from 1 to 20; p is a number within the range from 1 to 15; t is 0 or 1; y is 0 or 1; and G represents a group of formula; wherein; B represents an alkyl group having from 1 to 4 carbon atoms or represents a benzyl group; s is 1, 2 or 3; R 3, X and t are as defined above; N + is connected to R 2 in formula; and (CH 2) s is connected to the quaternary nitrogen atom in formula; B represents an alkyl group having from 1 to 4 carbon atoms or represents a benzyl group; s is 1, 2 or 3; R 3, X and t are as defined above; N + is connected to R 2 in formula; and (CH 2) s is connected to the quaternary nitrogen atom in formula; c) mixing said white pigment and impurities containing material of step a) and said collector agent of step b) in an aqueous environment to form an aqueous suspension; d) passing gas through the suspension formed in step c); e) recovering the white pigment containing product by removing the white pigment bearing phase from the aqueous suspension obtained after step d).