The influence of weathering on the reduction of llmenite with carbon
The influence of weathering on the reduction of llmenite with carbon
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DOI：
10.1007/bf02655932
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发表时间：
1989-10
期刊：
影响因子：
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通讯作者：
S. K. Gupta;V. Rajakumar;P. Grieveson
中科院分区：
文献类型：
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作者：
S. K. Gupta;V. Rajakumar;P. Grieveson
使用热重分析和 X 射线衍射、光学显微镜和产品的电子探针微量分析，研究了在 1000 °C 至 1100 °C 温度下用煤还原合成钛铁矿和三种钛铁矿精矿（Westralian Sands Limited (WSL)、Western Mineral Sands (WMS) 和 Florida）的情况。还原率和铁颗粒尺寸随着精矿风化程度的增加而减小。化学计量钛铁矿的还原速度比风化产物假金红石 (Fe2O3-3TiO2) 更快。 FeCl3的添加促进了铁的成核，提高了还原率，并且在1000℃下获得了铁的显着粗化。一般来说，反应产物是铁、金红石、还原金红石、未还原钛铁矿或α-氧化物、以及铁板钛矿固溶体。精矿中存在的少量锰（1.2 至 1.6% MnO）可稳定铁板钛矿相，从而保留大量铁。锰还形成α-氧化物相(Fe,Mn)TiO3，其主要是钛酸锰并集中到还原颗粒的中心。
The reduction of synthetic ilmenite and three ilmenite concentrates (Westralian Sands Limited (WSL), Western Mineral Sands (WMS) and Florida) with coal at 1000 ‡C to 1100 ‡C was stud-ied using thermogravimetry and X-ray diffraction, optical microscopy, and electron probe microanalysis of the products. The rate of reduction and the size of the iron particles decrease with increasing degree of weathering of the concentrate. Stoichiometric ilmenite reduces faster than pseudorutile (Fe2O3-3TiO2), which is a product of weathering. The addition of FeCl3, which promoted the nucleation of iron, increased the rate of reduction, and significant coars-ening of the iron was obtained at 1000 ‡C. In general, the products of reaction are iron, rutile, reduced rutiles, unreduced ilmenite or a-oxide, and pseudobrookite solid solution. A small amount of manganese (1.2 to 1.6 pct MnO) present in the concentrates stabilizes a pseudobrookite phase which retains a significant amount of iron. The manganese also forms an a-oxide phase, (Fe,Mn)TiO3, which is mainly a manganese titanate and concentrates toward the center of the reducing particles.