某难处理硫化矿常压碱浸预氧化工艺研究

Research on Atmospheric Pressure Alkaline Leaching Pre-oxidation Process for a Difficult Sulphide Ores

某地区硫化矿型难处理矿石直接氰化浸出回收率仅74.6%,为了提高其氰化金回收率,实现矿产资源利用的最大化,根据其矿石性质进行了氰化前常压碱浸预氧化预处理工艺研究。通过控制氢氧化钠用量40 kg/t,充气量2 L/min,氧化时间8 h,矿石中硫化矿物氧化率达到57.2%,预处理后氰化金回收率达到91.05%,较直接氰化回收率提高16.45个百分点。试验结果表明,该类型难处理硫化矿石氰化前进行常压碱浸预氧化处理可以取得较理想的工艺指标,后续工作可继续采用新的反应体系和反应条件,可尝试使用新型氧化药剂改善反应效率。

The recovery rate of direct cyanidation leaching of refractory sulfide ore in a certain area is only 74.6%.In order to improve the recovery rate of gold cyanide and maximize the utilization of mineral re⁃sources,the pre-oxidation pretreatment process of atmospheric alkali leaching before cyanidation was stud⁃ied according to the ore properties.By controlling the dosage of sodium hydroxide 40 kg/t,aeration volume 2 L/min and oxidation time 8 h,the oxidation rate of sulfide minerals in ore reached 57.2%,and the recovery rate of gold cyanide after pretreatment reached 91.05%,which was 16.45 percentage points higher than that of direct cyanide recovery.The test results show that the atmospheric alkali leaching pre-oxidation treatment of this type of refractory sulfide ore before cyanidation can achieve ideal process indicators.The follow-up work can continue to adopt new reaction systems and reaction conditions,and new oxidation agents can be used to improve the reaction efficiency.