关键词: 难处理金矿, 高硫含砷碳, 焙烧, 浸出

Abstract: A low-grade gold ore contained Au of 1.68 g/t，As of 0.43%，C of 0.40% and S of 3.20%，respectively，and the gold was disseminated in arsenopyrite，pyrite and limonite in microscopic or submicroscopic form. The ore was a typical refractory ore containing arsenic and carbon with the characteristics of fine particle size，high arsenic and carbon，which seriously effected the recovery of the gold.In order to recover the gold from the ore， cyanide leaching，gravity separation and flotation were carried out respectively. The results showed that the gold cyanide leaching recovery rate was only 5%， and the recovery rate of gravity separation was less than 10%.The gold concentrate could be obtained with Au grade of 15.04 g/t and Au recovery rate of 77.13% by flotation. Because of the higher harmful elements such as arsenic， carbon and sulfur in the gold concentrate and the higher loss of gold （0.42 g/t） in the flotation tailings，roasting pretreatment was adopted to remove harmful elements in gold concentrate and tailings， and then cyanidation leaching of calcine was used to recover gold. Finally， the total gold recovery rate of 70.66% was obtained by using the combined process of flotation，concentrate roasting cyanidation leaching and tailing roasting cyanidation leaching scheme. The gold of the ore was recovered effectively.

Key words: refractory gold ores, arsenic and carbon containing with high sulfur, roasting, leaching