钛渣替代钛矿制备钛白酸解试验研究

Study on acid digesting titania slag during titanium dioxide production

在酸解罐中采用TiO2质量分数为75%~80%的酸溶性钛渣与质量分数为96%~98%的浓硫酸进行酸解反应,通过添加硝酸钠或铁粉调节Ti3+浓度,然后熟化钛液。试验结果表明钛渣酸解替代钛矿制备钛白粉工艺简单,工业化生产可行,可以较大程度地减少“三废”排放;主要酸解工艺优化参数为:酸渣比1.7,成熟时间3 h,总钛质量浓度大于220 g/L,钛渣平均酸解率93%。

Acid-dissolved titania slag with the content of 75%～80% of TiO_2 was put together with the content of 96%～98% of concentrated sulfuric acid into a digestion tank to complete the digestion reaction,with the addition of sodium nitrate or iron powder to adjust the concentration of Ti^(3+) and then titania liquid got aged.The experimental result indicated the preparation of titanium dioxide powder from titania slag was simple as compared with that from titania minerals,minimizing the discharge of 'three wastes'.The optimal parameters for the digestion process are as follows:the ratio of sulphur acid to titania slag is 1.7;time for ageing,3 h;total content of titanium ≥220 g/L;averaged digestion rate,93%.