【作者】 屈启龙；

【导师】 王冠甫； 谢建宏；

【作者基本信息】 西安建筑科技大学 ， 矿物加工工程， 2007， 硕士

【摘要】 本课题对陕西省某含钒石煤矿进行了钒和石墨综合回收的研究。该矿储量巨大，矿石中钒含量较高，约为1.02％；另外伴生15％的隐晶质石墨，矿石中总碳含量高达35％，钒元素大部分赋存于绿泥石等铝硅酸盐矿物中，实现钒和石墨的综合回收是一大难点，目前尚未见到国内外对含钒石煤矿中石墨进行可选性研究的报道。针对该难选矿石，进行了包括原矿工艺矿物学研究、选矿工艺试验研究和提钒工艺试验研究等一系列试验研究，并获得以下主要成果：(1)查明矿石中矿物组成主要有绿泥石、石墨、碳质、石英、云母、滑石、磷灰石、电气石等。对主要有用矿物组分含量、结晶粒度、嵌布关系和分布规律等有比较清楚地认识。(2)矿石所含石墨为微晶、隐晶石墨，要提高其精矿品位，必须细磨，试验确定采用两段磨矿，第一段磨矿细度-200目65％，第二段磨矿细度-300目95％。(3)找出了适合该矿石的石墨优先浮选工艺流程。采用三次粗选、七次精选、中矿合并后再进行一次粗选、四次精选的浮选工艺流程，获得比较理想的选别指标：最终精矿中碳含量为65.88％，对石墨碳回收率为50％；钒含量为0.23％，钒损失率为2.43％。(4)找出了“一段氧化焙烧脱碳、二段低钠钙化焙烧碱浸出”的有效提钒工艺。获得了比较理想的试验结果：钒浸出率为77.45％。本研究对钒和石墨实现了综合回收，为该矿的开发提供了技术上可行、经济上合理的工艺流程和工艺条件。同时，本研究对该类型矿石的开发利用具有一定的指导意义。更多还原

【Abstract】 In this paper, the comprehensive recovery of vanadium and graphite from the vanadous stone coal in shannxi province was studied. The ore is abundant, which has higher content of vanadium, about 1.02%, and also 15% the associating graphitoid, and 35% total carbon. Most vanadium element distributes in chlorite and some other aluminosilicate minerals. Up to now, any report about the research on the effective separation of graphite from the vanadous stone coal ore have been hardly in home and abroad. So the comprehensive recycle of vanadium and graphite is a difficult problem. Concerning this ore difficultly processed, a series of experimental researches such as the mineralogy of raw ore, the technologies of mineral processing and vanadium pentoxide recovering were carried out, and the obtained achievements are as follows:(1) It was ascertained that the ore is mainly composed of chlorite, graphite, carbonaceous matter, quartz, mica, talcum, phosphorite and tourmaline. Besides that, it has a clear understanding about the content of valuable minerals, crystal granularity, dissemination and distribution rule etc.(2) The graphite in the ore is graphitoid. If the grade of concentrate is desired to improve, the fine grinding is needed. So two stages grinding is employed by the experiment, the grinding fineness of first stage is 65% less than 200 mesh, and the grinding fineness of second stage is 95% less than 300 mesh.(3) The preferential flotation flowsheet suitable for the graphite recovery from the ore was found, which includes three roughing, seven cleaning, middlings being merged then processed separately by one roughing, four cleaning. As a result, the ideal separation quota was gained, i.e. the finished concentrate with the grade of 65.88% carbon, the recovery of 50% graphite, the grade of 0.23% vanadium pentoxide and the loss factor of 2.43% vanadium pentoxide was gotten.(4) The effective technology of vanadium extraction was obtained, which includes the first stage oxidation roasting way for getting rid of carbon, the second stage CaO-roasting with small NaCl, the last leaching process with carbonate. The ideal experimental results are acquired, i.e. the vanadium leaching rate is 77.45%.Through the above experimental investigation, the comprehensive recovery of vanadium and graphite was achieved. This provides the technological flowsheet and conditions which are feasible on technique and reasonable on economy for the exploitation of the ore. Meanwhile, the achievement obtained is guiding significance for the exploitation and utilization of silimar ore.更多还原