南京大学学报(自然科学版) ›› 2022, Vol. 58 ›› Issue (2): 228234.doi: 10.13232/j.cnki.jnju.2022.02.006
• • 上一篇
Bo Chen1, Xiaoming Chen1(), Diyun Chen2
摘要:
铝土矿的矿石矿物主要为三水铝石、一水软铝石和一水硬铝石,是化学风化作用的产物,主要形成于炎热而潮湿气候条件下的风化壳中,但不同矿床中的主要矿物组合存在显著差异.其中,一水软铝石既是铝土矿中重要的矿石矿物,也是一种重要的无机新材料,查明该矿物的成因机制对理解铝土矿的成因及其资源的高效利用均有重要的意义.研究表明,细粒三水铝石(D50=0.5 μm)作为前驱体分别在175 ℃的水蒸气和热水中恒温12 h后,三水软铝石消耗殆尽,完全转化为具有完好自形晶体的一水软铝石.粗粒三水铝石(D50=120 μm)在165 ℃的水蒸气中恒温12 h后,在三水铝石的(001)晶面上生长出呈平行四边形板片状形貌的一水软铝石微晶;在175 ℃的热水中恒温12 h后,同样生成了大量平行四边形板片状一水软铝石微晶.一水软铝石晶体的大小和形貌特征表明,三水铝石向一水软铝石的转变受溶解?沉淀机制控制.由此可见,铝土矿中一水软铝石的形成可能与三水铝石的溶解有关,即受控于溶解?沉淀机制.
中图分类号:
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