To recycle vanadium from V-bearing steelmaking slag and V-bearing black
shale, the both were jointly roasted to generate vanadium-rich phase, and
then vanadium was separated by magnetic separation in this study. The
compositions of samples were determined by X-ray fluorescence meter and the
phases in the samples were characterized using X-ray diffractometer.
Experimental results showed that, with increasing the ratio of CaO content
to SiO2content in the samples, the vanadium separation efficiency first
decreased, increased, and then decreased again. With increasing roasting
temperature from 1423 to 1623 K, the vanadium separation efficiency
increased. With increasing roasting time from one hour to four hours, the
vanadium separation efficiency increased. The optimum conditions for
vanadium recycling are the basicity of 1.2, roasting temperature of 1623 K,
and roasting time of 4 hours. Under this condition, separation efficiency of
vanadium reaches 71.6%, and the concentrate contains 3.67% V2O5and 46.9%
Fe2O3. A flow for joint processing of V-bearing steelmaking slag and
V-bearing black shale was proposed, which involves vanadium separating, and
tailings utilizing.
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