Experimental Research on Environmental Friendly Gold Leaching of a Refractory Gold Ore in Laos
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摘要:
老挝某金矿矿石类型为蚀变岩型，金为矿石中唯一可回收元素，金属矿物主要为铁的硫化物，部分金包裹在硫化物中，属于较难处理金矿石。针对该矿石开展环保浸金剂浸金实验，获得较佳工艺参数为：原矿金品位为5.47 g/t，磨矿细度-0.074 mm含量90%，矿浆浓度40%，石灰用量3000 g/t，铁氰化钾助浸剂用量600 g/t，碱和助浸剂预处理2 h，金蝉浸金剂用量3000 g/t，浸出时间32 h，金浸出率可以达到93.97%以上。验证实验表明，在较佳工艺条件下，金的浸出率较稳定。
Abstract:The gold ore type of the gold mining in Laos is altered rock. Gold is the only recyclable element in the ore. Metal minerals are mainly iron sulfides. Part of the gold is wrapped in sulfide, which belongs to the refractory gold ore. The environmentally friendly gold leaching test was carried out for this ore, and obtain the best process parameters as: under the condition of the ore gold grade of 5.47 g/t, the grinding fineness of -0.074 mm content 90%, slurry concentration 40%, lime dosage 3000 g/t, leaching aid dosage of potassium ferricyanide 600 g/t, pretreatment 2 h after dosing alkali and leaching aid, dosage of Jinchan leaching agent 3000 g/t, leaching time 32 h, the gold leaching rate can be over than 93.97%. At the same time, conditional verification tests show that, under the best process conditions, the gold leaching rate is relatively stable.
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表 1 矿石多元素分析结果/%
Table 1. Multi-element analysis results of the ore
Au* Ag* C有 S As Sb TFe SiO2 MgO Al2O3 CaO K2O Na2O WO3 Cu 5.47 1.3 <0.01 1.25 0.31 0.0004 6.43 51.12 3.10 11.28 9.21 1.55 2.05 0.0082 0.010 *单位为g/t。 
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表 2 矿石矿物组成检测结果
Table 2. Mineral composition analysis results of the ore
金属矿物 非金属矿物 矿物 含量/% 矿物 含量/% 黄铁矿 2.4 石英 33 毒砂 0.7 绢云母、绿泥石、斜长石等硅酸盐矿物 45.3 黄铜矿 0.05 磁黄铁矿 0.05 方解石、白云石等碳酸盐矿物 18 金红石、钛铁矿等氧化矿物 0.5 小计/% 3.70 小计/% 96.30 合计/% 100.00 合计/% 100.00
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表 3 金粒度测量结果
Table 3. Particle measurement results of gold
粒级/mm +0.1 -0.1+0.074 -0.074+0.053 -0.053+0.037 -0.037 合计 含量/% 16 20.1 17.8 26.2 19.9 100.00
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表 4 条件验证实验结果
Table 4. Results of conditional verification experiments
序号 给矿品位/（g·t-1） 尾渣品位/（g·t-1） 浸出率/% 1 5.47 0.33 93.97 2 0.34 93.78 3 0.34 93.78
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