Experimental Study on Mineral Processing of Carlin-type gold deposits in Guizhou

摘要

The gold ore which contained 4.73 g/t Au was selected from carlin-type gold deposits in Guizhou. Three experiments on the gold ore were carried out. They were direct cyanide leaching, oxidizing roasting-cyanide leaching and flotation-oxidizing roasting-cyanide leaching. The experiments revealed that with the third process, ideal production index were obtained. The optimum conditions were confirmed: combined collector ammonium dibutyl dithiophosphate dosage was 60 g/t and butyl xanthate dosage was 120 g/t. Sodium cyanide dosage was 7000 g/t. As a result, we obtained satisfying selecting targets: The grade of gold was 42.0 g/t in the flotation concentrate. The gold leaching rate was up to 96.18%, and gold recovery was 88.23% after cyanide leaching. It was of important effect on decreasing resources waste and reducing environment pollution to research the project.