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在鼓泡反应器中考察了添加柠檬酸强化钢渣湿法烧结烟气脱硫的影响因素,包括钢渣粒度,吸收浆液浓度、进口二氧化硫浓度、停留时间,p H值,柠檬酸与钢渣的浸泡时间等,结果表明,柠檬酸浓度为2.0 mmol/L、钢渣浓度为4%、二氧化硫进口浓度为1 500 mg/m3、烟气停留时间为7 s、钢渣强化时间为2 h、钢渣粒度>200目,脱硫率达到90%以上。经4 mmol/L的柠檬酸强化后的钢渣浆液脱硫率比单纯钢渣浆液提高18.41%,达到90.99%的脱硫率,且有效反应时间延长50%,达到60 min以上。柠檬酸的加入,一方面促进了钢渣碱性组分溶解,另一方面在吸收液中形成柠檬酸和柠檬酸盐缓冲体系,增加了气液界面SO2浓度,提高了SO2的气液传质速率。
Influencing factors of flue gas desulfurization by wet-process sintering of steel slag with citric acid addition were investigated in bubbling reactor, including slag size, absorbed slurry concentration, imported sulfur dioxide concentration, residence time, p H value, citric acid and steel slag immersion time The results showed that the concentration of citric acid was 2.0 mmol / L, the slag concentration was 4%, the inlet concentration of sulfur dioxide was 1 500 mg / m3, the residence time of flue gas was 7 s, the slag strengthening time was 2 h, Desulfurization rate of more than 90%. The desulfurization rate of steel slag slurry enhanced by 4 mmol / L citric acid was 18.41% higher than pure steel slag slurry, reached 90.99% desulfurization rate, and the effective reaction time was prolonged by 50% to reach 60 min. The addition of citric acid promotes the dissolution of the alkaline components of the steel slag on the one hand, and forms the citric acid and citrate buffer system in the absorbing liquid on the other hand, increasing the SO2 concentration at the gas-liquid interface and increasing the gas-liquid mass transfer rate of SO2 .