THE SYNTHESIS OF NEW ANIONIC SURFACTANTS AND THEIR USE AS COLLECTORS IN FROTH FLOTATION OF NON-SULPHIDIC ORES

摘要

The present invention relates to the use of a compound obtainable by reacting an N-acyl neutral amino acid, or a salt thereof, or an N-acyl neutral amino acid oligopeptide or a salt thereof with a monohydroxy monocarboxylic acid, such as lactic acid or glycolic acid or a salt thereof, as a collector in a process for froth flotation of non-sulfidic ores, especially phosphate ores. The acyl group may have 7 to 23 carbon atoms and the amino acid may be selected from the group consisting of glycine, alanine, sarcosine, valine, leucine and isoleucine. The invention also relates to a method which comprises the steps of a) conditioning a pulped phoshate ore, wherein the phosphate ore comprises a calcium phosphate mineral or a mixture of such minerals, and gangue minerals, with an effective amount of a calcium phosphate mineral collector reagent, which is the above-mentioned compound, and optionally other flotation aids and b) performing a froth flotation process to recover the calcium phosphate mineral(s).