氨浸法预处理含砷难浸金矿石的应用研究  

Study on pretreatment of arsenic containing refractory gold ores with ammonia leaching

作　　者：夏光祥[1] 石伟[1] 涂桃枝[1] 方兆珩[1] 杨寒林 韩宝玲[1] 

机构地区：[1]中国科学院化工冶金研究所

出　　处：《黄金》1996年第10期28-34,共7页Gold

摘　　要：本文概述了氨浸法预处理含雌黄、雄黄的坪定金矿石及含砷锑汞的丹寨微细粒金精矿的应用研究。提出了用５％～７％氨水溶液溶解雌黄，并在８５℃及常压下氨水中加入硫磺，使难溶的雄黄转化为雌黄而溶解；在８５℃及２００ｋＰａ压力下，于５％～７％氨水溶液中加入铜离子作催化剂，催化氧化残余的雌黄、雄黄及毒砂的新型工艺，并对工艺过程各因素的影响进行了较为详细的研究。当用硫氨法脱砷－氨性催化氧化－氰化法处理坪定金矿石及用氨性催化氧化－氰化法处理丹寨金精矿时，都取得了较满意的效果。经预处理后，金的氰化浸出率分别可达８５％及８０％～８５％。A new process for pretreatment of arsenic refractory gold ores with ammonia leaching in function of cupric ions as catalyst was proposed in this paper The Ping Ding gold ore is a refractory ore containing 12g/tAu ,13 5%As,0 221%organic C and high alkaline gangue 46%of arsenic is present in the form of As 2S 3 and 38%in As 2S 2 A new patented process,consisting of ①dissolving As 2S 3 and ② convertingAs 2S 3 intoAs 2S 2in the presence of elemental sulfur in 5%～7% ammonia solution; ③Cu 2+ -catalytic oxidation in 5%～7%ammonia solution under 100～200kPa at 85℃ was developed by authors Pretreated by this process,over 85%of gold was recovered in a subsequent cyanide leaching When the gold concentrate containing As,Sb and Hg from Danzhai Mine was treated with Cu 2+ -catalytic oxidation in 5%～7% ammonia solution,80%～85% of gold was recovered in a subseqent cyanide leaching By comparison ,only a few percents of gold were recovered in direct cyanidation without pretreatment

关 键 词：脱砷 砷金矿石 提金 氨浸法 预处理 

分 类 号：TF831.032[冶金工程—有色金属冶金]