Resource evaluation of high-purity quartz raw material minerals in Renli deposit of Hunan Province
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摘要:
湖南仁里矿床是我国建国以来发现的品位最富、规模最大的超大型伟晶岩型钽矿床，拥有丰富的钽铌、铍等稀有金属矿和高纯石英原料矿。为了解区内伟晶岩型高纯石英原料矿品质，为矿山综合开发利用提供依据，对伟晶岩中的石英矿物特征、包裹体特征和杂质含量开展分析，并与邻区脉石英进行对比。研究表明: 区内伟晶岩中石英矿物呈透明-半透明，矿物样品的SiO2平均含量为99.982%，Al、B、Ca等14种杂质元素总量的平均值为110.06×10-6，Al平均含量为43.18×10-6，Ti平均含量为4.90×10-6；镜下观察显示石英颗粒大小不等，有一定的拉伸变形，颗粒表面通透性好，50%的颗粒内未见流体包裹体，包裹体类型为气液两相的H2O-NaCl型包裹体，包裹体形状各样、颜色明亮，个体形态差异较大，多数包裹体直径小于4 μm，最小个体直径不足1 μm，最大个体直径超过32 μm，视域内包裹体面积比例少于5%。区内高纯石英原料矿具有优良的禀赋条件，是优良的高纯石英硅质原料，预测仁里矿床高纯石英原料矿的潜在资源量超过3 000万t，加强选矿-提纯工艺研究有望获取4N8级及以上高纯石英产品。研究成果对构建平江县域高纯石英产业基地，促进湘东北地区高纯石英产业发展具有一定指导意义。
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关键词:
- 伟晶岩型高纯石英原料矿 /
- 资源评价 /
- 资源预测 /
- 仁里矿床 /
- 湖南省
Abstract:Renli deposit in Hunan Province is the richest and largest super-large pegmatitic tantalum deposit since the foundation of China. And it is rich in rare metal minerals such as tantalum niobium, beryllium and high-purity quartz raw material mineral resources. To understand the quality of pegmatition type high-purity quartz raw materials in this area and provide references for the comprehensive development and utilization of the mine, the authors in this paper carried out a study on the characteristics of quartz raw minerals, inclusions and impurity content in pegmatite, as well as a comparative study with vein quartz in adjacent areas. The results show that the quartz minerals in pegmatite in this area are transparent to semi-transparent, with an average SiO2 content of 99.982%, and the total content of 14 impurity elements such as Al, B, Ca is 110.06×10-6 on average in mineral samples. The average content of Al is 43.18×10-6, and the average content of Ti is 4.90×10-6. Under the microscope, the size of quartz grains are different with certain tensile deformation, and the surface permeability is good. Fifty percent of the grains have no fluid inclusions, and the inclusion type is H2O-NaCl type with gas and liquid phases. The inclusions have various shapes, bright colors, and large individual morphological differences. The diameter of most of the inclusions is less than 4 μm, with the smallest individual being less than 1 μm and largest individual of being more than 32 μm. The area ratio of inclusions in the field of view is less than 5%. The high-purity quartz raw materials in this area have excellent endowment conditions and are excellent high-purity quartz raw materials. It is predicted that the potential resources of high-purity quartz raw materials in Renli deposti exceed 3 000 wt. with reinforcement of research on beneficiation and purification processes, it is expected to obtain high-purity quartz products of 4N8 and above. This research could provide references for the construction of high-purity quartz industry base in Pingjiang County and the development of high-purity quartz industry in the northeastern Hunan Province.
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表 1 仁里矿床、Spruce Pine地区、阿尔泰地区全岩样品杂质含量对比
Table 1. Comparison of impurities in whole rock samples in Renli deposit, Spruce Pine area and Altai area
取样位置 样号 ωB/10-6 ω(SiO2)/% Ni Fe Cr Mg Ca Cu Ti Al Ba Na Li K Mn 杂质含量 仁里铌钽矿区 HS02 0.00 7.00 0.04 3.00 26.00 0.06 — 210.00 0.11 48.00 28.76 29.00 0.19 352.16 99.92 HS03 0.10 7.00 0.00 3.00 9.00 0.07 — 190.00 0.04 44.00 24.30 29.00 0.24 306.75 99.93 HS08 0.00 4.00 0.19 2.00 5.00 0.00 — 60.00 0.03 70.00 8.18 43.00 0.04 192.44 99.95 SH09 0.00 9.00 0.50 2.00 9.00 0.02 — 280.00 0.10 67.00 29.98 75.00 0.98 473.58 99.90 HS10 0.01 14.00 0.08 3.00 11.00 0.15 8.41 260.00 0.20 22.00 24.11 44.00 1.39 388.35 99.91 HW2(寒石) 0.01 4.90 0.07 3.50 7.80 0.03 7.51 220.00 — 2.00 35.50 16.00 0.50 297.83 99.93 平均 0.02 7.65 0.15 2.75 11.30 0.06 7.96 203.33 0.10 42.17 25.14 39.33 0.06 335.19 99.92 仁里周边 D04 0.06 235.00 0.09 34.00 10.80 0.06 6.81 910.00 — 32.00 23.50 790.00 3.70 2046.02 99.67 Spruce Pine[7] SP-01 < 0.05 51.00 0.10 19.50 1 898.00 < 0.05 1.60 11 622.00 5.02 6 669.00 2.51 347.00 — 20 615.83 — SP-02 < 0.05 23.40 0.08 28.00 1 635.00 < 0.05 1.29 7 573.00 19.00 4 839.00 1.03 182.00 — 14 301.90 — 阿尔泰[2] — 0.00 22.08 2.86 3.87 26.60 0.04 3.29 101.44 49.77 — 0.10 12.43 0.48 222.96 — 注: “—”表示未检测。 
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表 2 仁里矿床矿物样品杂质含量
Table 2. Impuritie content in mineral samples in Renli deposit
样号 ωB/10-6 ω(SiO2)/% Al B Ca Co Cr Cu Fe K Li Mg Mn Na Ni Ti 101 30.16 0.43 3.04 — 0.05 — 4.71 / 1.02 1.97 0.09 6.18 0.04 4.91 99.992 102 57.38 0.23 5.57 — 39.50 — 4.48 / 7.37 1.80 0.08 16.99 — 8.78 99.987 H237 42.00 / 10.00 ＜1 ＜1 ＜1 126.00 17.00 ＜2 3.90 4.50 21.00 ＜1 ＜1 99.966 平均值 43.18 0.33 6.20 0.33 13.52 0.33 45.06 / 3.46 2.56 1.56 14.72 0.35 4.90 99.982 注: “—”表示未检出; “/”表示未检测。
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表 3 D05点位高纯石英砂主要杂质元素含量
Table 3. Content of main impurity elements in high-purity quartz sand in D05 sumpling location
ωB/10-6 ω(SiO2)/% Al B Ca Cr Cu Fe K Li Mg Mn Na Ni P Ti 总量 15.39 0.01 0.34 0.02 0.03 0.83 0.22 0.35 0.18 0.1 0.68 0.02 0.36 1.25 19.78 99.998
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