POLYESTER POLYQUATERNARY AMMONIUM COMPOUND COLLECTORS FOR REVERSE FROTH FLOTATION OF SILICATES FROM NONSULFIDIC ORES

摘要

The present invention relates to a compound obtainable by the condensation of a polyol having 3-4 hydroxyl groups, adicarboxylic acid or a derivative thereof, an alkanolamine anda fatty acid, followed by reaction with an alkylating agent. This compound is useful as a collector in a process for the reverse froth flotation of non-sulfidic ores containing silicate as impurities, especially phosphate ores.