摘要
贵州某氰化尾渣含金1.66 g/t,金主要以裸露金和硫化物包裹金的形式存在,氰化尾渣粒度较细,-0.038 mm粒级占比超过80%。针对氰化尾渣含泥量高的特点,采用泥砂分选工艺,通过旋流器分级,对沉砂和溢流分别进行浮选回收。采用一粗二扫三精流程,对沉砂和溢流分别采用适应其特性的工艺参数及药剂制度,泥砂分选全流程闭路试验可以获得金品位12.42 g/t、金回收率50.13%的精矿;氰化尾渣全粒级浮选可以获得金品位9.49 g/t、金回收率38.10%的精矿。结果表明,泥砂分选工艺获得的精矿中金品位提高了约2.9 g/t,金回收率提高了约12百分点,实现了氰化尾渣中金的有效回收。
Certain cyanide leaching tailings in Guizhou contain 1.66 g/t of gold,primarily existing in the forms of exposed gold and sulfide-encapsulated gold.The tailings have a high fineness,with particles of-0.038 mm accounting for over 80%.Given the high slime content of the cyanidation tailings,a sand-slime separation process was employed.Cyclones are used for grading and flotation is performed for the recovery of the underflow and overflow separately.A closed-circuit test with roughing once,scavenging twice,and cleaning three times was conducted,with process parameters and reagent regimes tailored to the characteristics of the underflow and overflow.The sand-slime separation process achieved a concentrate with a gold grade of 12.42 g/t and a gold recovery rate of 50.13%,while the ungraded flotation process of the cyanidation tailings produced a gold concentrate with a grade of 9.49 g/t and a recovery rate of 38.10%.The results indicate that the sand-slime separation process improved the gold grade by approximately 2.9 g/t and the gold recovery rate by about 12 percentage points,effectively recovering gold from the cyanidation tailings.
作者
黄裕卿
李广
纪婉颖
周利华
刘鹏
Huang Yuqing;Li Guang;Ji Wanying;Zhou Lihua;Liu Peng(Zijin Mining Group Co.,Ltd.;State Key Laboratory of Comprehensive Utilization of Low-grade Refractory Gold Ores)
出处
《黄金》
CAS
2024年第9期46-51,共6页
Gold
基金
福建省科技计划项目(201711010)
厦门市留学人员科研项目(厦人社[2022]205号)。
关键词
氰化尾渣
泥砂分选
分级
全粒级
金回收
cyanidation tailings
sand-slime separation
grading
ungraded
gold recovery
