柴周缘晶质石墨矿地质特征及可利用性评价——以大通沟南山晶质石墨矿为例

The geological characteristics and availability evaluation of crystalline graphite deposit in the peripheral of Qaidam basin——Taking crystalline graphite deposit at Datonggounanshan as an example

为探讨研究柴达木盆地周缘晶质石墨矿的可利用性,以大通沟南山晶质石墨矿为例,在该地区开展了石墨矿地质特征研究,石墨矿石固定C含量分析、矿石矿物光片鉴定、石墨鳞片大小统计分析,并对典型石墨矿床开展了选矿试验研究和对比分析、石墨矿可利用性对比评价。结果表明:柴周缘广泛分布的古元古代达肯大坂岩群、金水口岩群,具多期变质作用,对形成晶质石墨矿有利;已发现的晶质石墨矿固定C含量一般在3%~10%、片径一般在0.03 mm左右,石墨矿石通过浮选,可以制备出品位达85%以上的石墨产品。综合分析认为变质岩性晶质石墨矿品质好,具有较好的利用价值。

In order to study the availability of crystalline graphite ore in the periphery of the Qaidam basin,taking crystalline graphite deposit from at Datonggounanshan as an example,we conducted research on the geological characteristics,statistical analysis of the fixed carbon content of the graphite ore and the size of the graphite scale. We developed the identification of the light slice of the ore mineral in this area. Additionally,beneficiation studies,comparative analysis and evaluation of the availability of the typical graphite deposits were carried out. The results show that the Palaeoproterozoic Dakendaban group and Jinshui Kou group,which are widely distributed in the periphery of the Qaidam basin,are truly beneficial to the formation of crystalline graphite ore because of its multistage metamorphism. The fixed carbon content of the crystalline graphite ore is from 3% to 10% and the diameter of the graphite ore is generally about 0. 03 mm. Moreover,by floatation graphite ore can be used to produce graphite product which has a grade of more than 85%. Comprehensive analysis shows that the metamorphic lithology and crystalline graphite deposit have good quality and utilization value.