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彭艳华, 彭光菊, 贾利攀, 周卫宁. 湖南宝山铅锌矿西部矿带银的工艺矿物学研究[J]. 岩矿测试, 2013, 32(5): 729-737.
引用本文: 彭艳华, 彭光菊, 贾利攀, 周卫宁. 湖南宝山铅锌矿西部矿带银的工艺矿物学研究[J]. 岩矿测试, 2013, 32(5): 729-737.
Yan-hua PENG, Guang-ju PENG, Li-pan JIA, Wei-ning ZHOU. Technological Mineralogy Research of Silver in the Lead-Zinc Ore Deposit in West Baoshan, Hunan Province[J]. Rock and Mineral Analysis, 2013, 32(5): 729-737.
Citation: Yan-hua PENG, Guang-ju PENG, Li-pan JIA, Wei-ning ZHOU. Technological Mineralogy Research of Silver in the Lead-Zinc Ore Deposit in West Baoshan, Hunan Province[J]. Rock and Mineral Analysis, 2013, 32(5): 729-737.

湖南宝山铅锌矿西部矿带银的工艺矿物学研究

Technological Mineralogy Research of Silver in the Lead-Zinc Ore Deposit in West Baoshan, Hunan Province

  • 摘要: 湖南宝山铅锌矿西部矿区为中低温热液裂隙充填交代型铅锌银矿床。本文对该矿带银的工艺矿物学进行系统研究,利用多种现代分析技术手段,查明矿石中银的主要矿物种类、赋存状态和工艺特征。化学分析结果确定矿石中银的平均品位为156.6×10-6;地质小样化学分析统计显示银含量在空间上呈现上部高、下部低,平面上北西和南西部较北东和南东高的特征;白云岩型、砂岩型、灰岩型、角砾岩型矿石的银平均含量分别为595.78×10-6、247.97×10-6、195.83×10-6、169.73×10-6,白云岩型矿石的银含量最高,角砾岩矿石的银含量最低;银与方铅矿关系密切,银和铅二者的含量总体表现出良好的趋同性,据此可预测高品位的铅矿石的银含量高。对光片进行显微镜下鉴定、扫描电镜以及电子探针分析,确定矿区的金属矿物主要是方铅矿、闪锌矿、黄铜矿和黄铁矿,初步查明矿石中的银矿物主要是银黝铜矿,其次是含银砷黝铜矿和含银方铅矿;该矿床银的存在形式主要有两种:一种是以独立矿物——银黝铜矿形式存在,这部分银含量为10.179%~13.579%,银的平均含量为12.061%;另一种是赋存于方铅矿中,这部分银含量为0.011%~0.127%,银的平均含量为0.069%。经银的物相分析、单矿物银含量分析和平衡配分计算,揭示银黝铜矿虽然含有较高品位的银,但因矿物含量较少,银的平衡配分低;方铅矿的银含量不高,但由于矿物含量高,平衡配分率达到84.78%,因此成为银的主要载体矿物。筛析实验也发现银与铅有较好的趋同性,进一步印证了银的主要载体矿物是方铅矿,并且银在细粒级中含量偏高。本研究提出,在选矿过程中要提高银的回收率,应重视细粒级中主金属元素铅、锌的回收。

     

    Abstract: The Lead-Zinc ore deposit in west Baoshan, Hunan Province, belongs to a medium-low temperature hydrothermal filling-metasomatic deposit, of which the grade of silver is 156.6 μg/g through chemical analysis. The study of the process mineralogy of silver in this ore zone is presented in this paper. By means of ore microscopy, chemical analysis, Scanning Electron Microscope (SEM) and Electron Microprobe Analysis (EPMA), the main types of silver, host occurrence of Ag and technological features were studied. Silver is mainly enriched in the upper seam rather than the lower seam, and is richer in the NW-SW seam than that in the NE-SE seam, based on the chemical analysis of ore samples, of which the ore types mainly include dolomite-type, sandstone-type, limestone-type and breccias-type, with silver content of 595.78 μg/g, 247.97 μg/g, 195.8 μg/g and 169.73 μg/g, respectively. The highest content of silver was found in dolomite-type ores and the lowest in breccias-type. By means of ore microscopy, Scanning Electron Microscope (SEM) and Electron Microprobe Analysis (EPMA), the metal minerals are mainly galena, sphalerite, chalcopyrite and pyrite, and freibergite, tennantite and and galena were the main silver-bearing minerals.The silver has two main forms in the deposit. The first form is independent silver-bearing mineral, freibergite. Quantitative analysis of EPMA showed that the content of silver in freibergite were 10.179%-13.579% with average content of 12.061%. The second form occurs in galena, the content of silver were 0.011%-0.127% with average content of 0.069%. By means of phase analysis, individual minerals analysis, it identifies that 84.78% of silver in ore mainly hosted in galenite, galenite is main carrier mineral. Partition calculation indicates that the convergence of silver and lead. This study suggests that, in order to improve silver recovery from ores during dressing processes, particularly care and attention should be paid to the recoveries of lead and zinc at the fine-grain level.

     

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