Multi-component leaching behavior of vanadium-chromium slag during calcification roasting-acid leaching
In this paper,using calcined clinker of vanadium-chromium slag as raw material,the effects of leaching pH value,leaching temperature,leaching time,and leaching liquid-solid ratio on the leaching rate ( mass fraction,the same below ) of vanadium,chromium,manganese,silicon,titanium and iron in vanadium-chromium slag were investigated.The results showed that during the acid leaching process,under the conditions of acid leaching pH value 2.8,leaching temperature 60℃,leaching time 60 min and liquid-solid ratio 5,the leaching rate of vanadium reached 87.81％.At this time,the leaching rates of chromium,manganese,silicon,titanium,and iron were 0.44％,23.91％,2.28％,0.23％ and 0.03％,respectively.In addition,extending the leaching time,increasing the leaching temperature,and appropriately increasing the leaching liquid-to-solid ratio are all beneficial to the separation and extraction of vanadium.
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