Patent ID: 8657118

Claim:
A collector for the separation by flotation of carbonates contained in phosphoric rock, comprising a mixture of phosphoric monoester and diester of formula (I) wherein, R 1 represents H, CH 3 or C 2 H 5 , R 2 represents, independently upon each occurrence, n-hexyl, 2-ethylbutyl, 2-methylpentyl, 2-ethylhexyl, or 2-methylheptyl, R 3 represents H or a suitable cation selected from the group consisting of an alkali metal, an alkaline earth metal, ammonium, alkyl ammonium, alkanol ammonium and glucammonium, k represents a number between 1 and 2, and n represents a number between 0 and 4, wherein in the mixture the by weight ratio between monoester and diester is between 90:10 and 50:50.