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直接还原过程中还原温度和还原时间对金属颗粒生长的影响研究
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作者 米寰鹏 《山西冶金》 CAS 2024年第3期42-44,共3页
金属颗粒粒径对直接还原产物金属化率、金属与脉石分离等有重要影响,控制还原温度和还原时间是控制金属颗粒粒径最基本的两个手段。理论分析和实验研究了还原温度和还原时间在直接还原过程中对金属颗粒生长的影响规律。结果表明:提高还... 金属颗粒粒径对直接还原产物金属化率、金属与脉石分离等有重要影响,控制还原温度和还原时间是控制金属颗粒粒径最基本的两个手段。理论分析和实验研究了还原温度和还原时间在直接还原过程中对金属颗粒生长的影响规律。结果表明:提高还原温度可以提高金属颗粒的形核和长大速率;延长还原时间可以增大金属原子的扩散距离,促进金属颗粒的迁移聚集。 展开更多
关键词 温度 时间 金属颗粒生长 直接还原
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Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate 被引量:4
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作者 ZHANG Xin LI Guang-hui +5 位作者 RAO Ming-jun MI Huan-peng LIANG Bin-jun YOU Jin-xiang PENG Zhi-wei JIANG Tao 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第5期1484-1494,共11页
The growing characteristics of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate under different conditions were investigated.The size of the metallic iron particles was quantita... The growing characteristics of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate under different conditions were investigated.The size of the metallic iron particles was quantitatively measured via optical image analysis with consideration of size calibration and weighted ratio of image numbers in the core,middle and periphery zones of cross-section of pellets.In order to guarantee the measurement accuracy,54 images were captured in total for each specimen,with a weighted ratio of 1:7:19 with respect to the core,middle and periphery section of the cross-section of pellets.Increasing reduction temperature and time is favorable to the growth of metallic iron particles.Based on the modification of particle size measurement,in terms of time(t)and temperature(T)a predicting model of metallic iron particle size(D),was established as:D=125−0.112t−0.2352T−5.355×10^−4t^2+2.032×10^−4t∙T+1.134×10^−4T^2. 展开更多
关键词 ludwigite ore reductive roasting metallic iron grain growth size measurement
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