外加磁场下印尼海砂铁矿氢还原动力学研究  

Hydrogen Reduction Kinetics of Indonesian Sea Sand Iron Ore under External Magnetic Field

作　　者：王顺 彭望君[1] 梁正清 张捷宇[1] WANG Shun;PENG Wangjun;LIANG Zhengqing;ZHANG Jieyu(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China)

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2020年第2期98-104,110,共8页Shanghai Metals

摘　　要：利用比例为2∶1的高纯氢氮混合气,在外加磁场与无磁场条件下,对印度尼西亚海砂矿颗粒进行低温还原,并对还原工艺进行了详细研究。采用XRD、SEM以及化学滴定法等分析测试手段,对不同条件下还原得到的海砂矿进行物相、微观形貌以及还原程度的检测分析。并利用未反应核动力学模型对试验数据进行拟合,判断还原反应过程中的限制性环节,探究海砂矿颗粒的还原工艺。结果表明:外加磁场对海砂矿的还原有明显促进作用,其金属铁含量及还原度均高于无磁场条件下的。在600~700℃时整个还原反应的限制性环节由界面化学反应控制,700~900℃时由内扩散和化学反应共同控制。Reduction of Indonesia sea sand ore particles at low-temperature was carried out by using a mixed atmosphere consisting of 2 parts of high-purity hydrogen and 1 part of high-purity nitrogen under the conditions of external magnetic field and no magnetic field,and the reduction process was studied in detail.The phase,microstructure,and reduction degree of Indonesia sea sand ores under different conditions were examined by XRD,SEM,and chemical titration.An unreacted nuclear kinetic model was employed to determine the restrictive link in the reduction reaction process by fitting the obtained experimental data,so as to explore the reduction process of sea placer particles.The results showed that the applied magnetic field could obviously promote the reduction of these ore particles,and its content of metal iron and reduction degree were higher than those without magnetic field treatment.The restrictive link of the whole reduction reaction was controlled by interface chemical reaction at 600℃to 700℃,and by internal diffusion and chemical reaction at 700℃to 900℃.

关 键 词：海砂矿 磁场 氢还原 动力学模型 

分 类 号：G63[文化科学—教育学]