Application of Bio-Oxidation in Leaching of a Low-Grade Primary Gold Ore in Inner Mongolia
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摘要:
对内蒙某低品位原生金矿进行了生物氧化浸出实验研究,考查了配入硫磺以及硫精矿对降低酸耗,以及金浸出率的影响。结果表明,当磨矿细度-74 μm 80%,酸浸1 h,矿石酸耗为31 kg/t;全泥浸出24 h,金浸出率为51%~55%;生物搅拌浸出,氧化6 d,硫氧化率为80%,金的浸出率提高到91.4%;生物柱浸,矿石粒度 12 mm 80%,生物氧化170 d-转型-氰化浸出180 d较直接氰化浸出360 d,金浸出率提高3.72%~23.54%;柱内配入硫磺及硫精矿不利于金的氰化浸出;柱外生物氧化硫磺可以减少硫酸酸耗15.7 kg/t。
Abstract:Bio-oxidation leaching test was conducted on a low-grade primary gold mine in Inner Mongolia. The acid consumption of ore, cyanidation, bio-oxidation stirred leaching, column leaching, add sulfur and sulfur concentrate to reduce acid consumption , and impact on gold leaching efficiencies were investigated. The results showed that with grinding fineness at -74 μm 80%, acid leaching for 1h, consumption of sulfur acid at 31 kg/t; After cyanidation for 24 h, the gold leaching efficiencies were 51%~55% ; After Bio-oxidation stirring leaching for 6 d, the sulfur oxidation efficiencies was reaching 80%, and the gold leaching efficiencies was reaching 91.4%; Bio-oxidation column leaching tests on gold ore of particle size at -2 mm 80% for 350 d(oxidation 170 d and cyanide leaching 180 d), the gold leaching efficiencies was increased by 3.72%~23.54% than the direct cyanide leaching 360 d; The addition of sulfur and sulfur concentrate was not conducive to gold cyanide leaching, and the bio-oxidation of sulfur outside the column could reduce the consumption of sulfuric acid by 15.7 kg/t.
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表 1 化学多元素分析结果/%
Table 1. Results of chemical analysis of multi-element
Au* Ag* Cu Fe Zn Pb TS S2- 0.9 2.98 0.022 2.84 <0.01 <0.01 1.01 0.96 As CaO MgO Al2O3 SiO2 K2O Na2O P2O5 0.1 0.019 1.71 8.06 77.48 1.51 0.18 0.038 *单位为g/t。 表 2 金化学物相分析结果
Table 2. Results of gold chemical phase analysis
金物相 裸露金 碳酸盐及氢
氧化物包裹硫化物包裹 硅酸盐包裹 含量/(g·t-1) 0.52 0.06 0.37 0.043 占有率/% 52.37 6.04 37.26 4.33 表 3 柱浸参数
Table 3. Column parameters
编号 重量/kg 浸出方式 柱内 柱外 0 10 直接氰化浸出 0% 0% 1 10 生物氧化 0%硫磺 0%硫磺 2 10 生物氧化 0%硫磺 3%硫磺 3 9 生物氧化 1%硫磺 0%硫磺 4 7.81 生物氧化 3%硫磺 0%硫磺 5 10 生物氧化 3.2%硫精矿 0%硫精矿 6 9 生物氧化 9.6%硫精矿 0%硫精矿 表 4 全泥氰化浸出实验结果
Table 4. Tests of fine grain cyanide leaching
尾矿
重/g液体
量/mLNaCN耗量/
(kg·t-1)渣金/
(g·t-1)液金/
(mg·L-1)浸出率/% 199.9 429.5 0.65 0.36 0.21 55.60 199.8 402.7 0.59 0.34 0.18 51.62 表 5 1#氧化渣氰化浸出实验结果
Table 5. Tests of oxidation residue(1#)cyanide leaching
氧化
天数/dNaCN耗量/
(kg·t-1)渣金/
(g·t-1)液金 /
(mg·L-1)浸出/% 硫氧化/% 4 1.03 0.08 0.12 85.71 59.58 5 1.06 0.07 0.12 87.27 75.31 6 0.87 0.05 0.14 91.40 80.73 7 0.91 0.06 0.13 90.03 84.79 8 0.94 0.04 0.12 92.31 87.50 9 0.88 0.04 0.12 91.09 85.10 10 0.78 0.03 0.12 95.02 91.67 11 0.56 0.02 0.13 96.79 92.71 12* 0.75 0.03 0.33 96.66 88.54 注:*为氧化结束后,剩余样品全部氰化结果 表 6 2#~6#氧化渣氰化浸出实验结果
Table 6. Tests of oxidation residue(2#~6#)cyanide leaching
编号 渣金/
(g·t-1)液金/
(mg·L-1)液酸量/
(g·L-1)NaCN耗量/
(kg·t-1)金浸
出率/%未氧
化硫/%2# 0.05 0.79 2.56 0.75 96.76 0.11 3# 0.04 0.37 5.90 0.76 96.66 0.12 4# 0.09 0.41 6.85 1.13 92.96 0.38 5# 0.06 0.26 9.07 1.40 92.58 0.76 6# 0.13 0.39 15.52 1.54 89.63 1.47 表 7 生物氧化柱浸实验结果
Table 7. Tests of biological oxidation column leaching
编号 0# 1# 2# 3# 4# 5# 6# 生物氧化时间/d 0 170 170 170 170 170 170 氰化浸出时间/d 360 180 180 180 180 180 180 硫酸耗量/(kg∙t-1) — 36.8 21.1 30.27 36.5 36.17 45.69 氰化钠耗量/(kg∙t-1) 2.59 2.88 3.23 3.2 3.14 3.57 3.68 尾渣品位/(g∙t-1) 0.52 0.39 0.42 0.52 0.58 0.36 0.55 金浸出率/% 38.26 60.64 56.32 48.12 47.52 61.8 41.98 -
[1] 王康林, 汪模辉, 蒋金龙. 难处理金矿石的细菌氧化预处理研究现状[J]. 黄金科学技术, 2001, 9(1):19-24. doi: 10.3969/j.issn.1005-2518.2001.01.003
WANG K L, WANG M H, JIANG J L. Current status of studies on bacterial oxidation and pre-disposal of refractory gold ores[J]. Gold Science and Technology, 2001, 9(1):19-24. doi: 10.3969/j.issn.1005-2518.2001.01.003
[2] D E Rawling, B D Johnson, Springer-verlagberlin Heidelberg[M]. Biomining, 2007: 113-138.
[3] 刘晓荣, 姜圣才. 磁黄铁矿和黄铁矿的生物浸出研究 [J]. 矿冶工程, 2006, 19(9): 34-36.
LIU X R, JIANG S C. Bioleaching of pyrrhotite using thiobacillus ferrooxidans [J]. Mining &Metallurgical Engineering, 2006, 26(6): 39-42.
[4] 温建康, 阮仁满, 陈景河, 等. 紫金山铜矿生物堆浸提铜酸铁平衡工艺研究[J]. 稀有金属, 2006, 30(5):661-665. doi: 10.3969/j.issn.0258-7076.2006.05.019
WEN J K, RUAN R M, CHEN J H, et al. Acid and iron balance in bectarial heap-leaching of Zijinshan copper ore[J]. Chinese Journal of Rare Metal, 2006, 30(5):661-665. doi: 10.3969/j.issn.0258-7076.2006.05.019
[5] 蒋磊, 周怀阳, 彭晓彤.氧化亚铁硫杆菌对黄铁矿、黄铜矿和磁黄铁矿的生物氧化作用研究[J]. 科学通报, 2007, 52(15): 1802-1813.
JIANG L, ZHOU H Y, PENG X T. Study on the biological oxidation of pyrite, chalcopyrite and pyrrhotite by thiobacillus ferrooxidans[J]. Chinese Science Bulletin, 2007, 52(15): 1802-1813.