Lowering of Grinding energy and enhancement of agglomerate strength by dehydration of Indonesian laterite ore
Lowering of Grinding energy and enhancement of agglomerate strength by dehydration of Indonesian laterite ore
复制标题
印尼红土矿脱水降低磨矿能、提高团矿强度
DOI：
10.2355/isijinternational.42.243
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
J. Yagi
中科院分区：
文献类型：
--
作者：
H. Purwanto;T. Shimada;R. Takahashi;J. Yagi
为了利用富铁红土作为炼铁原料，通过实验研究了脱水对其烧结体物理性能的影响。本实验中使用的红土是在印度尼西亚的Sebuku岛生产的，含铁量为50.88%。采用X射线衍射法对红土矿的矿物组成进行了分析。采用差热分析进行热分析，并通过高温显微镜观察分析了热处理过程中的脱水行为。对红土矿预热前后的强度进行了测定，并以型煤的形式进行了结块。此外，还测量了磨削功指数，以评价磨削作业的能耗。X-射线衍射仪和差热分析表明，铁主要形成水合氧化铁(针铁矿)，在530-673K温度范围内分解，高温显微镜观察解释了脱水导致裂纹的产生。测定了红土在预热和不预热条件下制得的型煤的抗压强度。在673K下预热1h，可提高红土矿石的抗压强度，预热红土的磨矿功指数比未预热的原矿降低约35%。试验结果表明，预热处理有利于提高型煤的抗压强度，降低红土矿的磨矿能耗。
In order to utilize the iron-rich laterite as raw material for ironmaking process, the effect of dehydration on physical properties of its agglomerate was investigated experimentally. The laterite used in this experiment was produced in Sebuku Island (Indonesia) containing 50.88 mass% of iron. The laterite ore was analyzed by X-ray diffraction for its mineral composition. Differential Thermal Analysis was employed for the thermal analysis and High Temperature microscopic observation was conducted to clarify the behavior of dehydration during the thermal treatment. Agglomeration was carried out in the form of briquette and the strength was measured for laterite ore before and after preheating. Furthermore, Grinding Work Index was measured to evaluate the energy consumption for grinding operation. X-ray diffractometry and Differential Thermal Analysis revealed that the iron mainly formed iron oxide hydrate (goethite), and it decomposed at the range of 530-673 K. High Temperature Microscopic observation explained that the dehydration resulted in crack generation. The crushing strength was measured for the briquettes prepared from the laterite with or without preheating. The improvement of crushing strength was obtained by preheating the laterite ore at 673 K for 1 h. The grinding work index for preheated laterite was obtained about 35% lower than that of no preheated original ore. Generally, the experimental results showed that preheating treatment promoted in increasing the crushing strength of briquette and decreasing energy consumption for the grinding of laterite ore.