Recovery of vanadium and nickel from high carbon coal slag by sulfuric acid maturation-water leaching method
High carbon vanadium cinder in an Indian plant contains 3.57％vanadium and 1.19％nickel,which has a high recovery value.However,after detailed raw material analysis,the slag has a high carbon content(14.61％).The effect of traditional direct leaching is poor,so it is necessary to decarbonize the vanadium containing cinder by oxidation roasting first,and then to extract vanadium and nickel by sulfuric acid-water leaching technology.The roasting,sulfuric acid curing and water leaching process parameters were studied,and the roasting temperature and time were investigated.The effects of the leaching conditions such as the ratio of solid to liquid,temperature and time were obtained by comparing the leaching rates of vanadium and nickel.The results showed that the optimum roasting temperature and time were 800 ℃ and 2 h,respectively.The optimum leaching size of calcine is less than 0.075 0 mm,the proportion is 90％,and the optimum grinding time of calcine is 120 s.The optimum curing parameters are the acid-material ratio of 1.5∶1 and curing for 1 h at 200 ℃.The optimal water leaching condition is that the solid-liquid ratio is 4∶1 and the material is leached at 95 ℃ for 2.5 h.Under the optional process parameter conditions mentioned above,the leaching rate of vanadium can reach up to 96％,and the leaching rate of nickel is about 53％.
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