Process for manufacturing white pigment containing products

A process for manufacturing a white pigment containing product comprising 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 (1),
• wherein
• R1 represents a hydrocarbon group containing from 6 to 30 carbon atoms,
• A1 represents an alkylene group having from 1 to 6 carbon atoms,
• E1, E2 and E3, are identical or different from each other, each independently chosen from among alkylene oxide groups containing from 1 to 6 carbon atoms,
• n1, n2 and n3, are identical or different from each other, each independently chosen from an integer which value is from 1 to 20,
• p is 1, 2, 3 or 4,
• and compounds of formula (2)
• wherein
• R21 represents a hydrocarbon group containing from 6 to 30 carbon atoms,
• R22 and R23 are identical or different from each other, each independently chosen from among hydrocarbon groups containing from 1 to 6 carbon atoms,
• R24 represents hydrogen or a hydrocarbon group containing from 1 to 6 carbon atoms,
• A2 represents an alkylene group having from 1 to 6 carbon atoms, and
• q is 1, 2, 3 or 4,
• and mixtures of compounds (1) and (2),
• c) mixing the white pigment and impurities containing material of step a) and the collector agent of step b) in an aqueous environment to form an aqueous suspension,
• d) passing gas through the suspension formed in step c), and
• e) recovering the white pigment containing product by removing a white pigment bearing phase from the aqueous suspension obtained after step d).