ABSTRACT Many studies investigated the effects of grinding aids on mechanical and breakage properties of particles, as well as the flowability of ore-water slurries in wet grinding mills. Only recently, it was showed that grinding aids can promote grain-boundary fracturing. This paper aims to observe the effects of water pretreatment on chromite liberation, to underlie some reactions between water and chromite samples which promote the liberation of coarse chromite grains, i.e. the grain-boundary fracturing. For the purpose of this study, two different chromite ore samples were initially pretreated under water at different sets of pH, temperature and pretreatment time. Then, the untreated and pretreated samples were broken in a drop-weight tester (J/g). Finally, the grade-recovery plots in the selected progeny size fractions of the untreated and pretreated samples were compared. The results show that the hydrolysis of ore samples in 15 min of pretreatment improves the grain-boundary fracturing. The results also suggest that mineral carbonation may be beneficial for chromite liberation.

中文翻译：

---

研究水预处理对铬铁矿释放的影响

摘要 许多研究调查了助磨剂对颗粒机械性能和破碎性能的影响，以及湿磨机中矿水浆液的流动性。直到最近，才表明助磨剂可以促进晶界压裂。本文旨在观察水预处理对铬铁矿释放的影响，以了解水和铬铁矿样品之间促进粗铬铁矿颗粒释放的一些反应的基础，即晶界破裂。出于本研究的目的，两种不同的铬铁矿样品最初在不同的 pH 值、温度和预处理时间下在水中进行预处理。然后，将未处理和预处理的样品在落锤测试仪（J/g）中破碎。最后，比较了未处理和预处理样品的选定后代大小部分的等级恢复图。结果表明，预处理15 min内的矿石样品水解改善了晶界压裂效果。结果还表明矿物碳酸化可能有利于铬铁矿的释放。