超声辅助盐酸酸浸高钛渣收尘灰提钛实验研究

Experimental study on extracting titanium from high titanium slag recovery dust leached in hydrochloric acid assisted by ultrasonic wave

针对高钛渣生产过程中产生的大量无法处理的收尘灰,本文提出采用超声波辅助盐酸酸浸高钛渣收尘灰提高酸浸灰中二氧化钛的方法,用XRD谱图对比了高钛渣收尘灰煅烧前后的结晶分布特征,考察了盐酸浓度、酸浸时间、酸浸浓度、酸灰比对酸浸灰中二氧化钛含量的影响,并与无超声波作用的酸浸实验进行对比。结果表明,与无超声条件相比,因超声效应造成颗粒分散与表面更新,加快了反应速率,可将酸浸时间从6h缩短至2.5h,同时酸浸灰中二氧化钛含量明显提高,在超声波作用下,盐酸浓度5mol/L,酸浸温度90℃,酸浸时间2.5h,酸灰比1.4∶1,酸浸灰中二氧化钛可达56.2%。

Base on a large number of recovery ash unable to deal with come from the high titanium slag production process. An effective approach use ultrasonic assisted hydrochloric acid leaching of high titanium slag dust was proposed to improve the titanium dioxide of acid leaching. The crystal distribution characteristics before and after calcination of high titanium slag recovery dust are compared with XRD spectrogram where study is carried out regarding the influence of hydrochloric acid concentration, acid leaching time, acid leaching concentration and acid-dust ratio on the titanium dioxide of acid leaching and compared with acid leaching experiment without ultrasonic wave. Results indicate that the reaction rate is quickened due to distributed particle and surface renewal caused by ultrasound effect, which can shorten the acid leaching time from 6h to 2. 5h and the content of titanium dioxide in acid leaching was obviously increased, compared with the experiment performed under the condition without ultrasonic wave. Under the action of ultrasonic wave, the content of titanium dioxide in acid leaching ash is up to 56.2% with hydrochloric acid concentration of 6tool/L, acid leaching temperature at 90℃, acid leaching time for 2h and acid-dust ratio of 1.4： 1.