关键词: 难处理金矿石, 浮选, 高硫高砷, 氰化浸出

Abstract: A high sulfur and arsenic gold ore contains gold of 2. 90 g / t and silver of 59. 00 g / t with As content of 6. 06% and S content of 5. 20%. The particle size of gold minerals in the ores are fine,which are all microscopic gold and fine grained gold,associated with sulfide minerals such as chalcopyrite and pyrrhotite in arsenopyrite,causing difficult in monomer dissociation. In order to further realize the efficient utilization of refractory gold ores with high sulfur and arsenic,flotation and cyanide leaching tests were carried out on the basis of ore process mineralogy research,and the combined process flow of flotation and cyanide leaching was determined to carry out the tests. The test results indicated that under the best reagent system,when the fineness of the raw ore is -0. 074 mm accounting for 75%,one roughing test is carried out. When the coarse concentrate is ground to -0. 038 mm accounting for 99%,test of two scavenging and two cleaning,and once sulfur and arsenic separation was carried out. The final gold grade is 17. 19 g / t,and the gold recovery is 79. 06% with a silver grade of 269. 00 g / t and a silver recovery of 68. 73%. When the flotation tailings were ground to -0. 010 mm accounting for 86%,the cyanide leaching process was used to treat the flotation tailings,and the gold leaching rate was 22. 22% and silver leaching rate was 57. 78%. The recovery rate of gold and silver reached 83. 71% and 86. 80% respectively,realizing the effective recovery and utilization of gold and silver.

Key words: refractory gold ores,flotation,high in sulfur and arsenic,cyanide leaching