China Nonferrous Metallurgy

The distribution ratio of PM10 dust in the vanadium extraction process is higher than that of traditional decarburization converters, it's hard to meet ultra-low emission standard. In this paper, the process of pre-treatment by dust agglomeration followed by electrostatic adsorption with dry ESPs was proposed to treat the primary flue gas from vanadium extraction converters, and tests were carried out on the performance of three coagulants. The test results indicate that the coagulant KGM-g-PDMC shows the best effect by reducing dc100 to 120μm and enabling the removal rate of 10μm and above particulate matter to reach 70%; moreover, the coagulation effect of KGM-g-PDMC is improved with the increase of its concentration and the decrease of off-gas temperature. According to the SEM detection of the dust with and without coagulation pre-treatment, it was found that agglomeration could contribute to convergence-adsorption coupling effect while enlarging particle size, making the specific surface area of dust further increased, which favors to continuous convergence-adsorption coupling in the downstream treatment. In this process, the coagulant KGM-g-PDMC is cost-effective, the off-gas after treatment can meet the requirement of ultra-low emission and the overall investment is lower than that of developing a new type of ESP, thus, the process is worthy of promotion.