硼砂对高磷鲕状赤铁矿强化还原

李明明,黄 润,钟 正,张金柱,

钢铁 ›› 2018, Vol. 53 ›› Issue (3) : 10-15.

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钢铁 ›› 2018, Vol. 53 ›› Issue (3) : 10-15. DOI: 10.13228/j.boyuan.issn0449-749x.20170289
原料与炼铁

硼砂对高磷鲕状赤铁矿强化还原

  • 李明明1,2,黄 润1,2,钟 正1,2,张金柱1,2
作者信息 +

Intensive reduction of high phosphorus oolitic hematite by borax

  • 李明明1,2,黄 润1,2,钟 正1,2,张金柱1,2
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文章历史 +

摘要

高磷鲕状赤铁矿的还原对后续的磁选分离起着重要作用,尤其是金属铁的聚集长大。以高磷鲕状赤铁矿为原料,研究添加剂硼砂对高磷鲕状赤铁矿进行强化还原的影响。研究结果表明,温度为1 000 ℃、硼砂添加量为6%时,失重率达到31.11%,金属化率达到90.10%。XRD、SEM-EDS 分析表明,添加硼砂能促进反应物的熔点降低;铁橄榄石(Fe2SiO4)、铁尖晶石(FeAl2O4)和蓝晶石(Al2SiO5)衍射峰消失,出现了低熔点的钙长石(CaAl2Si2O8)、硼酸铝钠(Na2Al2B2O7)和硼酸钠(Na2B6O10)衍射峰。还原后试样中金属铁颗粒的数量与粒度均随着硼砂添加量的增加而提高,强化了还原效果。

Abstract

The oolitic hematite ore was recognized as one of the most difficult iron ores to use because of its unique oolitic structure, fine iron particle size, and high phosphorus content. The reduction of high phosphorus oolitic hematite played an important role in subsequent magnetic separation, especially the accumulation and growth of iron. The influence of borax on the reduction of high phosphorus oolitic hematite was studied. It indicates that the weight loss rate is up to 31.11% and the metallization rate is up to 90.10% when the temperature is 1 000 ℃ and the borax percentage is 6%. XRD and SEM analyses show that borax could decrease the melting point of the reactant.On the other hand,the diffraction peaks of fayalite (Fe2SiO4), ferrospinel (FeAl2O4) and kyanite (Al2SiO5)disappear, and then the ones of anorthite (CaAl2Si2O8) , sodium aluminum borate(Na2Al2B2O7) and sodium borate (Na2B6O10) with low melting points appear. In the end, the amount and particle size of iron in the reduced samples increase with the addition of borax increasing.It indicates that the effect of reduction is strengthened.

关键词

高磷鲕状赤铁矿 / 硼砂 / 强化还原 / 金属铁颗粒

Key words

high phosphorus oolitic hematite / borax / strengthen reduction / metallic iron particles

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李明明, 黄润, 钟正, . 硼砂对高磷鲕状赤铁矿强化还原[J]. 钢铁, 2018, 53(3): 10-15 https://doi.org/10.13228/j.boyuan.issn0449-749x.20170289
LI Meng-Meng, HUANG Run, ZHONG Zheng, et al. Intensive reduction of high phosphorus oolitic hematite by borax[J]. Iron and Steel, 2018, 53(3): 10-15 https://doi.org/10.13228/j.boyuan.issn0449-749x.20170289
中图分类号: TF556   

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基金

鲕状赤铁矿的固态选择性还原动力学与还原产物分离的研究;真空碳热还原处理钛精矿制备高品位钛渣的热力学与动力学研究

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