Experimental Study on the Dressing and Smelting of a Pyrrhotite-bearing Primary Gold Ore

Abstract

The content of pyrrhotite in a primary gold mine containing pyrrhotite is 0.68%. In the process of alkaline leaching pretreatment, there are problems such as large ore quantity and high alkali consumption. In the process of cyanide leaching, there are problems such as high cyanide consumption and slow gold leaching rate. In order to solve these problems, combined with production practice, experimental studies on magnetic separation, magnetic separation tailings leaching, magnetic separation concentrate alkali leaching pretreatment - leaching, magnetic separation concentrate flotation - cyanide leaching, etc. were carried out. A new process of "magnetic separation-magnetic flotation flotation flotation flotation flotation alkali leaching pretreatment mixed cyanide leaching" has been developed to reduce the pretreated minerals to less than 2% of the original ore, which is higher than the gold leaching rate of the conventional "alkali leaching pretreatment cyanide leaching" process, and the alkali (sodium hydroxide) consumption and cyanide (sodium cyanide) consumption are reduced by 80.83% and 32% respectively, and the annual reagent cost is saved by more than 600000 yuan.