Study On A New Technology Of Comprehesive Recovering Graphite And Vanadium Pentoxide From Vanadium Ore With High Carbon

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.