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Improving roasting performance and consolidation of pellets made of ultrafine and super high grade magnetite concentrates by modifying basicity

《钢铁研究学报:英文版》2020年 第7期 | Feng Zhang De-qing Zhu Jian Pan Zheng-qi Guo Meng-jie Xu   School of Minerals Processing and Bioengineering Central South University Changsha 410083 Hunan China Sinosteel Equipment&Engineering Co. Ltd. Beijing 100000 China
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摘 要:For improving the strength of pellets made of ultrafine and super-high-grade magnetite concentrates,the influence of basicity(CaO/SiO2 ratio)on the roasting and consolidation of pellets was investigated.The results showed that with the basicity of pellets increasing from 0.09 to 0.60,the compressive strength of both preheated and roasted pellets achieved an evident improvement from 502 and 2519 to 549 and 3096 N/pellet,respectively;meanwhile,the roasting time decreased from 15 to 9.min.The low-viscosity liquid phases were easily generated in fired pellets at the basicity range of 0.40-0.60 under the roasting temperature of 1240°C,filled the voids between hematite particles and tightened the bonding among particles,effectively restraining the generation of concentric cracks and decreasing the porosity of fired pellets;low-viscosity liquid phases facilitated the solid diffusion of hematite,leading to the formation of coarse hematite crystals and thicker connecting necks.
【分 类】【工业技术】 > 冶金工业 > 一般性问题
【关键词】 BASICITY CONSOLIDATION Ultrafine and super-high-grade magnetite concentrate Fired pellet Compressive strength Liquid phase
【出 处】 《钢铁研究学报:英文版》2020年 第7期 770-781页 共12页
【收 录】 中文科技期刊数据库