老挝巴勉石英脉型金矿石工艺矿物学研究

doi:10.11872/j.issn.1005-2518.2021.06.058

Abstract

Abstract:

The technological type of ore in Bamian，Laos is low sulfide and quartz vein gold ore among which the main recycled element is gold with the grade of 42×10^-6.The process mineralogy of gold ore was researched by microscope identification，SEM observation，MLA analysis，EDS analysis and multi-element chemical analysis.In order to find out the occurrence state of gold and provide process mineralogy data support and theoretical basis for the subsequent process design of beneficiation.The results show that：（1）The precious metal mineral is natural gold，which is the main recovered element.The main non-metallic minerals are quartz and plagioclase，the main metallic minerals are pyrite and arsenopyrite，followed by sphalerite.（2）A total of 165 natural gold particles were found in the ore，and the gold minerals are mainly natural gold which average purity is 905.09‰.The shape of natural gold is complex，mainly for the horn-granular and long-granular.The grain size of natural gold is coarser，which included 79.84% of visible gold，and 20.16% of micro gold.（3）The occurrence types of gold included 52.67% of fissure gold，40.33% of intergranular gold and 7.00% inclusion gold.（4）The main gold bearing minerals are arsenopyrite，pyrite，sphalerite，quartz and tourmaline，which closely symbiosis.The occurrence state of gold shows that the main natural gold is fissure gold and intergranular gold，the total of which is 93.00%.Moreover，the granularity of fissure gold and intergranular gold is relatively coarse.Usually the gold in this ore is easy to liberate.The arsenic in gold concentrage will exceed the standard because of the arsenopyrite is the main gold bearing mineral and arsenic bearing mineral. Through the unite gravity-flotation separation process，the gold recovery can reach to 95.5% under the grinding fineness of -0.074 mm 75%.The results of this study have found out the occurrence state of gold，filled in the blank of process mineralogy of quartz vein type gold ore and provided the basis for the process design of beneficiation.

Key words: quartz vein type gold ore, natural gold, occurrence state, embedded characteristics, process mineralogy, Laos

CLC Number:

TD953

Cailian GUO,Fangyin NIU,Binglong CHEN,Haijun WANG. Process Mineralogy of Quartz Vein Gold Ore in Bamian，Laos[J].Gold Science and Technology, 2021, 29(6): 908-916.

Figures/Tables 11

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成分	含量/%	成分	含量/%
SiO₂	69.12	S	0.36
Al₂O₃	10.66	Cu	0.0039
TFe	2.80	Pb	0.0015
TiO₂	0.19	Zn	0.0064
K₂O	0.86	Co	0.0015
Na₂O	3.70	As	0.057
CaO	2.24	Au*	0.42
MgO	0.61	Ag*	0.057

矿物组成	含量/%	矿物组成	含量/%
石英	53.66	黄铁矿	0.60
斜长石	30.27	毒砂	0.15
绢云母	7.30	闪锌矿	<0.01
方解石	4.55	黄铜矿	少见
绿泥石	2.92	方铅矿	少见
电气石	1.15	褐铁矿	少见
榍石	0.15	自然金	微量
铁白云石	少量

相别	含量/（×10^-6）	占有率/%
合计	44.81	100
裸露半裸露金	44.00	98.19
硫化物包裹金	0.23	0.51
硅酸盐包裹金	0.16	0.36
碳酸盐包裹金	0.24	0.54
赤褐铁包裹金	0.18	0.4

序号	Ag	Au	成色/‰	赋存状态
平均值	9.49	90.51	905.1
1	8.76	91.24	912.4	岩石裂隙
2	8.69	91.31	913.1	毒砂裂隙
3	11.82	88.18	881.8	毒砂粒间
4	9.04	90.96	909.6	毒砂—石英粒间
5	9.18	90.82	908.2	闪锌矿—石英粒间
6	9.19	90.81	908.1	闪锌矿—黄铁矿粒间
7	10.30	89.70	897.0	方铅矿—石英粒间
8	9.23	90.77	907.7	包裹于石英中
9	9.34	90.66	906.6	包裹于毒砂中
10	9.38	90.62	906.2	包裹于黄铁矿中

序号	延展率	形态特征	粒数统计
序号	延展率	形态特征	颗粒数	形态分数/%
1	1.0~1.5	角粒状	70	42.42
		尖角粒状	18	10.91
		次圆—浑圆粒状	14	8.48
2	1.5~3.0	长角粒状	47	28.48
2	1.5~3.0	麦粒状	3	1.82
3	3.0~5.0	板片状	5	3.03
3	3.0~5.0	叶片状	4	2.42
4	1.5~5.0	枝杈状	4	2.42

Process Mineralogy of Quartz Vein Gold Ore in Bamian，Laos

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