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| 还原剂对铁矿含碳球团还原熔分行为的影响 |
| Effect of reducing agent on reduction and melting-separation behaviours of iron ore/carbon composite pellets |
| 投稿时间：2019-01-02 |
| DOI： |
| 中文关键词: 铁精矿 含碳球团 还原剂 兰炭 反应性 灰熔点 粒度 熔分 |
| 英文关键词: iron ore concentrate carbon-containing pellet reducing agent semi-coke reactivity ash melting point particle size melting-separation |
| 基金项目:国家自然科学基金资助项目 (51804024)；中央高校基本科研业务费专项资金资助项目(FRF-TP-18-008A2)；北京科技大学钢铁冶金新技术国家重点实验室资助项目(41618022). |
| 作者 | 单位 | E-mail | | 张浩 | 北京科技大学钢铁冶金新技术国家重点实验室,北京,100083 | zhanghaoustb@163.com | | 王广 | 北京科技大学钢铁冶金新技术国家重点实验室,北京,100083 | | | 张诗瀚 | 北京科技大学钢铁冶金新技术国家重点实验室,北京,100083 | | | 王静松 | 北京科技大学钢铁冶金新技术国家重点实验室,北京,100083 | | | 薛庆国 | 北京科技大学钢铁冶金新技术国家重点实验室,北京,100083 | |
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| 中文摘要: |
| 针对转底炉珠铁工艺用还原剂的选择,本文以兰炭、烟煤、无烟煤、木炭、焦粉作为还原剂制备铁矿含碳球团,从反应性和灰熔融性两方面入手,研究在不同还原、熔分温度下,还原剂种类及其粒度对含碳球团还原熔分行为的影响。结果表明,当还原温度较低(1000、1100 ℃)时,球团金属化率随还原剂反应性的提升而增加；1200 ℃下还原时,不同种类还原剂球团的金属化率差别不大,均在92%左右。当还原剂粒度从48~180 μm降至-48 μm,对于反应性较高的兰炭和无烟煤,球团表面裂纹增多,体积明显膨胀,终点金属化率降低,熔分后金属收得率降低；而对于反应性较低的焦粉,球团体积变化不明显,球团终点金属化率升高,熔分后金属收得率升高。综合能耗、熔分效果和经济效益等方面,该工艺适宜的还原剂为兰炭,粒度为48~180 μm,适宜的加热制度为:预还原 1200 ℃×15 min→熔分1350 ℃×7 min,此条件下球团的金属收得率为96.05%。 |
| 英文摘要: |
| Aimed at the selection of reducing agents for RHF iron bead technology, the iron ore/carbon composite pellets were prepared by employing semi-coke, bituminous coal, anthracite, charcoal and coke breeze as the reducing agents. From the aspects of reactivity and ash fusibility, the effects of type and particle size of reducing agents on the reduction and melting-separation behaviours of carbon-containing pellets at different reduction and melting-saparation temperatures were investigated. The results show that the metallization rate of pellets increases with the increase of reactivity of the reducing agent at relatively low reduction temperature of 1000 and 1100 ℃; when reduced at 1200 ℃, the metallization rates of pellets with various reducing agents are of no significant difference, all of which are around 92%. When the particle size of the reducing agent is reduced from 48~180 μm to -48 μm, in terms of semi-coke and anthracite with higher reactivity, the surface cracks of pellets increase and the volume expands significantly, but the metallization rate and the metal yield after melting-separation decrease. For the less reactive coke powders, the volume change of pellets is not obvious, and the metallization rate and metal yield after melting-separation increase. Taking energy consumption, melting effect and economic benefit into consideration, the suitable reducing agent in this case is semi-coke with a particle size of 48~180 μm, and the suitable heating schedule is pre-reduction at 1200 ℃ for 15 min and then melting-separation at 1350 ℃ for 7 min, and the iron yielding rate of the obtained pellets is 96.05%. |
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