机械活化方式对攀枝花钛铁矿浸出强化作用

Enhancement effects of mechanically milling facilities on dissolution of Panzhihua ilmenite

对滚筒球磨、行星球磨和搅拌球磨不同设备机械活化攀枝花钛铁矿及其浸出反应进行了研究.结果表明,机械活化可以强化钛铁矿的浸出过程,搅拌磨强化浸出的效果最好,行星磨次之,滚筒磨最差.活化后的钛铁矿浸出活性与其晶胞在c轴方向的显微应变增大有关,而与a轴和b轴方向的显微应变关系不大.搅拌磨活化时能产生更细小的矿物颗粒,在c轴方向有更大的显微应变以及在颗粒表面有更高的表面活性,浸出活性更高.钛铁矿的浸出效果与有效的活化效果有关,而活化效果与机械力的强度和类型都有关.

The mechanical activation of Panzhihua ilmenite with tumbling ball mill, planetary ball mill and stirring ball mill, and the dissolution of activated ilmenite were investigated. Milling operation considerably accelerated the leaching reaction of ilmenite in dilute sulfuric acid solutions. Samples activated with stirring ball mill exhibited the highest leaching activity and those activated with planetary ball mill the second, while those activated with tumbling mill showed the least activity improvement. Characterization results suggested that the enhancement of ilmenite leaching was due to the increasing lattice strain in c axis direction of the ilmenite crystal cells. Milling with stirring ball mill produced more fine particles, larger lattice strain in c axis direction, and higher surface activity. It apparently accelerated dissolution. The enhancement effect on leaching reaction relied not only on the strength but also the form of the mechanical force applied.