Study on the Beneficiation-Metallurgy Process on an Argillaceous High Oxidation Gold in Henan Province
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摘要:
河南某金矿具有嵌布关系复杂、氧化率高、泥化严重等特点，属于复杂难选泥质高氧化型金矿，选矿厂浮选指标不理想。为提高此类矿石的选矿回收率，开展了详细的实验研究，实验研究结果表明：采用单一浸出工艺和预氧化+浸出工艺均很难获得理想的浸出指标，Au浸出率仅为77.46%、80.28%；采用焙烧+浸出工艺可显著提高浸出指标，Au浸出率为93.66%，但技术经济性较差；采用浮选+浸出工艺可获得较为理想的指标，Au总回收率为94.25%，且工艺流程可操作性强。因此，浮选+浸出工艺对此类矿石具有较好的适应性，不仅可回收高度弥散分布在硫化物和脉石矿物中的超细微粒级金，而且粗粒级颗粒金也得到较好的回收。本研究为矿山企业的生产实践提供了重要借鉴。
Abstract:A gold in Henan Province is a complex and argillaceous high oxidation gold mines, and it has the characteristics of complex embedment characteristics, high oxidation rate and serious argillization, which lead to the poor beneficiation indexes . In order to improve the beneficiation recovery rate of this kind of ore, a detailed test was carried out. The results show that it is difficult to obtain a good leaching index by single leaching process or pre-oxidation-leaching process, and the leaching rate is 77.46% and 80.28%; The leaching index can be significantly improved to 93.66% by roasting-leaching process, but the technical economy is poor. A good total recovery indexes of 94.25% can be obtained by flotation-leaching process, which is highly operable. Therefore, the flotation-leaching process has good adaptability to this kind of ore, which can not only recover the ultra-fine particle gold highly dispersed in sulfide and gangue minerals, but also recover the medium and coarse particle gold. This study provides a reference for the production practice of mining enterprises.
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Key words:
- Oxidized gold ore /
- Argillaceous /
- Flotation-leaching /
- Non-toxic leaching agent /
- Recovery rate
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表 1 试样矿物成分及含量分析结果/%
Table 1. Mineral composition analysis results of the sample
非金属矿物 金属矿物 石英 40.30 菱铁矿 2.31 伊利石 31.32 褐铁矿 0.11 白云石 9.80 黄铁矿 0.02 斜长石 7.33 赤铁矿 ＜0.01 绿泥石 6.34 方铅矿 ＜0.01 角闪石 1.27 黝铜矿 ＜0.01 方解石 1.18 黄铜矿 ＜0.01 磷灰石 0.01 闪锌矿 ＜0.01 重晶石 ＜0.01 斑铜矿 ＜0.01 自然金 ＜0.01 
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表 2 试样多元素分析结果/%
Table 2. Multi-element analysis results of the sample
Au* Ag* Cu Pb Zn TFe2O3 Al2O3 TiO2 SiO2 As K2O CaO MgO S P2O5 TC 有机碳 Te* 1.42 2.84 0.004 0.0026 0.0051 10.76 14.39 0.94 48.27 0.0039 3.06 4.81 5.01 0.074 0.27 2.42 0.35 1.25 *单位为g/t。
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表 3 试样金物相分析结果
Table 3. Gold element chemical phase analysis of the sample
名 称 品位/（g·t−1） 分布率/% 裸露半裸露金 0.64 45.01 碳酸盐包裹金 0.13 9.28 铜铅锌硫化物包裹金 0.34 23.77 赤铁矿包裹金 0.10 7.24 硫铁矿包裹金 0.12 8.51 石英硅酸盐包裹金 0.09 6.19 合 计 1.42 100.00
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表 4 浮选+浸出实验结果
Table 4. Test result of flotation-leaching
浮选部分 产物名称 产率/% 品位Au/(g·t−1) 回收率/% 精 矿 1.43 58.45 61.15 尾 矿 98.57 0.54 38.85 计算原矿 100.00 1.37 100.00 浸出部分 浸出时间/h 浸渣品位/（g·t−1） 作业浸出率/% 总回收率/% 2 0.12 77.78 91.37 5 0.08 85.19 94.25 12 0.07 87.04 94.97 24 0.05 90.74 96.40 48 0.04 92.89 97.24
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