Mineralogy, liberation and leaching characteristics of iron oxide phases in an Indian diaspore sample  

印度一水硬铝石样品中氧化铁相的矿物学、解离和浸出特性（英文）

作　　者：Danda Srinivas RAO Swagat S.RATH Nilima DASH Swagatika MOHANTY Surendra K.BISWAL 

机构地区：[1]Council of Scientific and Industrial Research, Institute of Minerals and Materials Technology

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第8期1640-1651,共12页中国有色金属学报（英文版）

摘　　要：The removal of iron from an Indian diaspore sample was studied using magnetic separation and leaching techniques aided by an in-depth mineralogical characterization study involving quantitative mineralogical evaluation by scanning electron microscope（QEMSCAN）, electron probe micro-analyzer（EPMA） and X-ray diffraction（XRD）. The characterization studies indicate that extremely fine-sized hematite grains are associated with several other mineral phases in a complex manner with around 60% of the hematite not liberated even below the size of 38 μm limiting the scope of physical separation processes to remove the iron. Wet high intensity magnetic separation（WHIMS） studies reveal that only 49% of iron can be removed. Further, leaching studies using oxalic acid suggest that around 76% of the iron can be removed under conditions such as a solid to liquid ratio of 0.05：1, a temperature of 90 ℃ a time period of 120 min and an acid concentration of 1 mol/L. The dissolution of iron in oxalic acid is found to be controlled by chemical reaction and the activation energy is calculated as 35.15 k J/mol.利用磁选和浸出技术从印度一水硬铝石样品中除铁,采用扫描电镜、电子探针显微分析仪和X射线衍射等定量矿物学评价技术进行深入的矿物学表征研究。结果表明,极细的赤铁矿颗粒与其他几种矿物相以复杂的方式结合在一起;即使粒度小于38μm,仍有约60%的赤铁矿未被解离出来;这个粒度也是物理分离过程去铁的极限。湿式强磁选研究表明,只有49%的铁可被除去。进一步的草酸浸出研究表明,在固液比0.05:1、温度90°C、时间120 min、酸浓度1 mol/L的条件下,可除去约76%的铁。铁在草酸中的溶解受化学反应控制,计算的活化能为35.15 k J/mol。

关 键 词：DIASPORE LIBERATION MINERALOGY LEACHING magnetic separation 

分 类 号：TF56[冶金工程—钢铁冶金]