Studies on synthesis of new collectors and their effects on gold.

Several new collectors including Benzoyl thiourea, Butyl thiourea, Butyl thiocyanate and Dodecyl thiophenol were designed and synthesized, and their collecting performances on gold, pyrite and pyrite bearing gold were studied as well in this paper.The collecting effect on gold decreased in order of Dodecyl thiophenol, Butyl thiocyanate, Butyl thiourea and Benzoyl thiourea.The selectivity increased in sequence of Dodecyl thiophenol, Butyl thiourea, Benzoyl thiourea and Butyl thiocyanate.Furthermore, the unusual high selectivity of Butyl thiocyanate was investigated using modern structural theory.We suggested that a rather unusual ir-bond selectively formed between Butyl thiocyanate and ores.The gold containing d10 electrons had a stronger ability to form a kind of bond than ferrum containing d6 electrons.This led to the high selectivity of Butyl thiocyanate for gold flotation.