湿磨活化对稀硫酸加压浸出攀枝花钛铁矿的影响

Effect of wet-milling activation on dilutesulfuric acid pressure leaching of panzhihua ilmenite

采用40 wt.%稀硫酸加压浸出湿磨活化钛铁矿富集二氧化钛,着重考察了磨球尺寸配比(Φ10mm+Φ20mm)、球料比、球磨时间以及浸出时间对钛铁矿富集的影响。结果表明,采用Φ10mm单一磨球活化时TiO2富集效果最好,提高球料比可以强化钛铁矿的浸出,延长球磨时间会增加铁和钛的浸出,但当球磨时间超过120min时,球磨时间对浸出的影响很小。获得了优化的湿磨活化条件:磨球尺寸Φ10mm、球料比20∶1和球磨时间2h。此条件下的湿磨钛铁矿在反应温度150℃、硫酸浓度40 wt.%和酸矿比2∶1下浸出反应3h,所得富钛料中TiO2含量达到~84%。本研究结果表明,将浅度浓缩至~40wt.%的硫酸法钛白废酸用于攀枝花钛铁矿的加压浸出制备富钛料是可行的。

Pressure leaching of wet-milling activated ilmenite in a 40 wt.%sulfuric acid solution was studied. The effects of different size milling balls（Φ10 mm＋Φ20 mm） mass ratio,ball/ore mass ratio and milling time on the leaching were examined. The experi-mental results demonstrated that the best beneficiation was obtained with the single size ball ofΦ10mm for the milling. The dissolu-tion of iron from ilmenite was enhanced by elevating ball/ore ratio. The dissolution of iron and titanium increased with increasing milling time until the milling time exceeded 120 minutes. Optimal wet-milling conditions were obtained as follows：milling balls sizeΦ10 mm,ball/ore mass ratio 20：1 and milling time 2h. The wet-milling ilmenite obtained was pressure leached for 3h under the conditions of reaction temperature 150℃,acid/ore mass ratio 2：1 and H2 SO4 concentration 40 wt.%. A Ti-rich material with TiO2 content of^84%was obtained. The results obtained in the present investigation demonstrated that it is feasible to upgrade the Pan-zhihua ilmenite in a^40 wt.%sulfuric acid obtained by concentration of the 20 wt.%spent acid discharged from the sulfate TiO2 process.