| China is rich in two vanadium mineral resources:vanadic-titanomagnetite and stone coal vanadium mine. The former have a great reserves, mainly in the Commonwealth of Independent States,the United States,South Africa,China,Norway,Sweden,the Netherlands,Canada and Australia.in China, which are mainly distributed in the Pan zhihua region. The latter is widely distributed in several provinces which lack of coal in the South of China. Large reserves,a stable horizon,with high-grade vanadium, the main characteristics such as high content of ash,high density,low heat,compact structure,high point of ignition,difficult to combustion and difficult to completely Burning,much hard and hard grind. At the same time, the stone coal main occurrence in the Cambrian strata.Stone coal is not only a low hydrocarbon and carbon but also low-calorie, low quality coal with high ash content, at the same time, it is a low-grade multi-metal ore contain a high utilization value. According to different Stone coal contain different main elements, stone coal can be divided into such types as vanadium,vanadium molybdenum,vanadium nickel,vanadium gallium,uranium vanadium,selenium vanadium and silver vanadium, solving the problem about use of low-heat stone coal has a very important strategic significance.Vanadium is an important strategic material with a high melting point and easy processing characteristics of deformation, and its have a widespread use, mainly used in iron and steel industry,cutting-edge defense technologies,chemical industry,textile industry and other fields. With high-strength low-alloy steel increasing applications in the auto industry and building material industry, the amount of vanadium will be increased dramatically. Tongren Prefecture of Guizhou have a lot of stone coal resources with different grade of vanadium. A great deal of analysis are used to study the different grade of stone coal ore. a direct pressure acid leaching methods method H2SO4 and R1 mixed pro-rata and reaction process to join the regular R2 is used.Through of such means that the multi-element chemical analysis,DTA-TGA,electron microprobe analysis and scanning electron microscopy analysis, we know that the stone coals in this paper about vanadium main occurrence in mica, a small amount compared to the same type of quality in the form of To replace the iron oxide and Fe3+ into the clay mineral ore, such as oxidation, and a very small amount compared to the same type of quality in the form of Al3+ to replace the insoluble into the silicon aluminate phase. At the same time, four of five price and the price of vanadium content in more than 50% of this study are easy to extract stone coal ore.On this basis, the vanadium leaching rate is effect by parameters such as reaction time,reaction temperature,amount of H2SO,liquid-solid,amount of R1,amount of R2,time of accession R2 and etc. When the amount of sulfuric acid 35%, extraction temperature 92～93℃, temperature time 6h, the amount of hydrofluoric acid 4% to 6% and 0.4% the amount of sodium hypochlorite, sodium hypochlorite accession to the time of 3 hours after the temperature by adding liquid Solid than 2 to 1,the vanadium leaching rate can reach 89%,87%,91%.At the same time, comparison of different grade of coal extraction parameters of vanadium extraction rate of regularity. The results show that the stone to a different grade of coal extraction parameters of vanadium extraction rate of the laws are basically the same. In order to further verify the stability of the leaching, to choose the best technical parameters for a six kintal category to expand the experiment, the vanadium leaching rate not lower than 85%,which have a same test results as small experiments. The process is simple,adaptable,application of a wide range,low equipment investment,short process and low cost advantages. |
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