Use of quaternary ammonium compounds as collectors in foam flotation procedures

摘要

Use of a product that can be obtained by the condensation, in one or several stages, of a compound having the formula: ** Formula ** in which R1 is a hydrocarbyl group having 7-24 carbon atoms, which can be branched or linear, saturated or unsaturated, AO is an alkyleneoxy group having 2-4 carbon atoms, n is a number between 0 and 20, and Y is O, C ( = O) NH or NZ, where Z is a group R2 in which R2 is a C1-C4 alkyl group or the benzyl group, with the proviso that when Y is NZ or C ( = O) NH, then n is = 1; a dicarboxylic acid or one of its derivatives having the formula (IIa) or (IIb): ** Formula ** in which D is -OH, -Cl, or -OR4, where R4 is a C1-C4 alkyl group; R3 is an alkylene radical of the formula - (CH2) z-, in which z is an integer from 0 to 10, and in which the alkylene radical may be substituted with 1 or 2 -OH groups; the group -CH = CH-, a clickloalkylene, a cycloalkenylene or an arylene group; and an alkanolamine having the formula (III): ** Formula ** in which each x is independently a number between 1 and 5, and Σx on average is a number between 2 and 10, AO is an alkyleneoxy group having 2-4 carbon atoms, R5 is a C1-C3 alkyl group or a [AO] x group in which AO and x have the same meaning as before; followed by the reaction with an alkylating agent R6X, where R6 is a hydrocarbyl group and X- is an anion obtained from the alkylating agent R6X; or a product that can be obtained by the condensation of a compound (I) or a compound obtained by the partial or total quaternization of (I); (IIa) or (IIb); and a compound obtained by partial or total quaternization of the alkanolamine (III); as a collector in a foam flotation procedure.