钛渣酸解尾气S含量研究

Study on the S Content of Titanium Slag Acid Hydrolysis Tail Gas

针对某钛白粉厂钛渣酸解尾气中S含量超标问题,对比分析了钛矿及钛渣原料中S含量,利用硫酸模拟了不同酸解条件下尾气中S含量变化规律,开展了钛渣酸解工艺对酸解尾气S含量影响规律验证试验。结果表明:钛渣S含量0.10%低于钛矿中S含量0.15%,现场钛渣酸解尾气中的S主要来源于硫酸;在模拟试验中,随着硫酸浓度的增加,尾气中S含量逐渐降低且降低幅度逐渐减少;随着温度的增加,尾气中S含量逐渐增加且增加幅度减少;在钛渣酸解工艺验证试验中,随着反应酸浓度由92%降低至84%,反应最高温度由226℃降低至186℃,酸解率由93.19%降低至90.78%,尾气中S含量由0.55 g降低至0.09 g,S来源于硫酸占比由91.1%降低至44.4%,在研究的反应酸渣比下,酸渣比对尾气中S含量基本无影响。

To solve the problem of the exceeding S content in tail gas from a titanium dioxide plant,the S content of titanium ore and titanium slag raw materials was compared and analyzed.The S content of the tail gas under different acid hydrolysis conditions was simulated using sulfuric acid.Verification test of the effect of hydrolysis process on the S content of acid hydrolysis tail gas was carried out.The results showed that the S content of titanium slag was 0.10%,lower than the 0.15% S content in titanium ore.The S in titanium slag acid hydrolysis tail gas mainly came from sulfuric acid.During the simulation test,with the increase of sulfuric acid concentration,the content of S in the exhaust gas gradually decreased and the extent of decrease gradually decreased.As the temperature increased,the S content of the exhaust gas gradually increased and the extent of increase decreased.During the titanium slag acid hydrolysis process verification test,as the reaction acid concentration decreased from 92% to 84%,the maximum reaction temperature decreased from 226 ℃ to 186 ℃,the acid hydrolysis rate decreased from 93.19% to 90.78%,and the S content in the tail gas decreased from 0.55 g to 0.09 g.S originated from sulfuric acid decreased from 91.1% to 44.4%.The acid-slag ratio showed almost no visible effect on the S content in the tail gas.