西藏扎仓茶卡低品位固体硼矿矿物学与地球化学特征及可选性研究
Mineralogical and geochemical characteristics and significance of Low grade solid Boron ore in Chagcam Caka, Tibet.#$NL Zhang weice1 Zhao yuanyi2
投稿时间:2018-12-03  修订日期:2019-10-31
DOI:
中文关键词:  库水硼镁石,柱硼镁石,低品位硼矿,扎仓茶卡盐湖,西藏
英文关键词:Kurnakovite  Pinnoite  low-grade boron ore  Chagcam Caka Saline Lake  Tibet
基金项目:
作者单位邮编
张维策 中国地质大学北京 100083
赵元艺 中国地质科学院矿产资源研究所 国土资源部成矿作用与矿产资源评价重点实验室 100037
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中文摘要:
      西藏扎仓茶卡盐湖是我国重要的固体硼镁矿产地,规模达到超大型,也是西藏目前唯一产有硼镁矿石的盐湖,长期以来是阿里地区重要的税收来源地。经过多年的开采,B2O3≥28%的富矿资源已采掘殆尽,矿区堆存有大量的低品位矿石。本文在采集样品的基础上,开展了基于X射线的粉晶衍射与扫描电镜的矿物组成的鉴定和化学组分析,为低品位矿石的综合利用提供理论依据。研究结果表明,扎仓茶卡盐湖低品位硼矿的矿物种类有库水硼镁石、柱硼镁石、石英、钠长石、微斜长石、方解石、白云母、文石、水菱镁矿、石膏和锰热臭石共11种,硼矿物仅有库水硼镁石和柱硼镁石两种,库水硼镁石的含量平均为21.14%;柱硼镁石的含量平均为8.99%。扎仓茶卡低品位硼矿样品中B2O3平均含量达13.50%,有重要的经济利用价值。因为扎仓茶卡有着丰富的卤水资源,且低品位硼矿主要是库水硼镁石,可考虑利用密度差的重选法,库水硼镁石为易选型,选矿方法是对矿石进行磨矿,磨至0.1 mm以下,然后用密度为1.2 g/cm3的卤水作为介质,重选法进行选别。
英文摘要:
      Chagcam Caka Saline Lake is an important producer of solid ascharite ore in China and also the sole one that produced ascharite in Tibet. The solid ascharite ore with the scale up to super-large has long been an important tax revenue in Tibet, after several years of mining, the rich ore with B2O3≥28% has been depleted in this lake , remaining amount of low-grade ore in the mine. In this paper, on the base of sample collection, X-ray Power Diffraction, Scanning Electron Microscope and analysis of chemical composition were conducted to provide a theoretical basis for the comprehensive utilization of low grade ore. The results show that in total 11 mineral species in the low-grade boron ore of Chagcam Caka Saline Lake was observed, including Kurnakovite, Pinnoite, Quartz, Albite, Microcline, Calcite, Aragonite, Muscovite, Hydromagnesite, Gypsum and Manganpyrosmalite, respectively. Boron mineral only contains Kurnakovite and Pinnoite, with average value of 21.14% and 8.99%. The low-grade boron show an important economic value that the average content of B2O3 is 13.50%. Because Chagcam Caka Saline Lake has affluent bittern resource, and Kurnakovite is the main low-grade ore, so the beneficiation method is gravity concentration, which considers density difference, and it need to grind the ore to 0.1 mm or less and to sort with the brine whose specific gravity is 1.2 g/cm3 as a medium.
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