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| 1 | Strengthening iron enrichment and dephosphorization of high-phosphorus oolitic hematite using high-temperature pretreatment显示文摘The efficient development and utilization of high-phosphorus oolitic hematite is of great strategic significance for the sustainable supply of iron-ore resources in China.In this paper,the mechanism of high-temperature pretreatment for enhancing the effect of iron enrichment and dephosphorization in the magnetization roasting–leaching process was studied by X-ray diffraction(XRD),vibration sample magnetometer(VSM),scanning electron microscopy and energy dispersive spectrometry(SEM–EDS).Compared with the process without high-temperature pretreatment,the iron grade of the magnetic separation concentrate after high-temperature pretreatment had increased by 0.98%,iron recovery rate had increased by 1.33%,and the phosphorus content in the leached residue had decreased by 0.12%.High-temperature pretreatment resulted in the dehydration and decomposition of hydroxyapatite,the dehydration of limonite and the thermal decomposition of siderite,which can produce pores and cracks and weaken the compactness of the ore,improve the magnetization characteristics of roasted ore,and strengthen the iron enrichment and dephosphorization during the magnetization roasting and leaching process. | Wen-tao Zhou Yue-xin Han Yong-sheng Sun Yan-jun Li | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，4： | 13 |
| 2 | 悬浮焙烧过程中菱铁矿热解原位动力学、相变及产物特性研究显示文摘菱铁矿是一种储量丰富的铁矿石,但其利用率较低,尚未得到高效开发利用。菱铁矿选择性转化为磁铁矿和CO是高效利用菱铁矿的关键。本文研究了悬浮磁化焙烧过程中菱铁矿的原位动力学和机理,丰富了菱铁矿作为还原剂的绿色悬浮磁化焙烧理论体系。气体产物分析表明,反应速率峰值随温度的升高而增大,且反应速率曲线呈现“早峰长尾”的特征。菱铁矿热解反应的机理模型为收缩球模型(R^(3)):f(α)=3(1-α)^(2/3),E_(α)为46.4653 k J/mol;A为0.5938 s^(-1);动力学方程为k=0.5938exp[-46.4653/(RT)]。原位HT-XRD结果表明,在N2气氛下菱铁矿的最终产物为磁铁矿和方铁矿,它们具有良好结晶度。在620℃时,固相产物的磁性达到峰值,其中饱和磁化强度(Ms)、剩磁磁化强度(Mr)和矫顽力(Hc)分别为53.63×10^(-3)A·m^(2)/g,10.23×10^(-3)A·m^(2)/g和12.40×10^(3)A/m。经过焙烧,菱铁矿颗粒的致密结构遭到破坏,转变为疏松多孔的结构,降低了颗粒的力学强度,有利于降低后续磨矿作业的能耗。 | 张琦 孙永升 秦永红 高鹏 袁帅 | 2022 | Journal of Central South University2022，29，6： | 2 |
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