炼焦除尘灰制备球团矿的工艺优化试验
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作者单位:

1.海洋装备用金属材料及其应用国家重点实验室,辽宁 鞍山 114009 ;2.鞍钢集团钢铁研究院,辽宁 鞍山 114009 ;3.鞍钢集团工程技术有限公司,辽宁 鞍山 114021

作者简介:

徐礼兵(1988—),男,高级工程师,从事烧结球团配矿技术研究工作。

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中图分类号:

TF046.6

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Process optimization test of coking and dust removal ash preparation pellets
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Affiliation:

1.State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114009 ,Liaoning,China ;2.Iron and Steel Research Institute of Ansteel Group,Anshan 114009 ,Liaoning,China ;3.Ansteel EngineeringTechnology Co.,Ltd.,Anshan 114021 ,Liaoning,China

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    摘要:

    为实现炼焦除尘灰的资源化利用并探索其作为球团矿原料的可行性,本文系统考察在造球过程中配加炼焦除尘灰对生球、干球及成品球团矿等关键质量指标的影响,旨在确定其工业化应用的技术方案。 试验以鞍钢磁铁精矿为主要原料,按不同比例掺配炼焦除尘灰进行球团制备与焙烧。 结果表明:炼焦除尘灰的配入对生球和干球质量指标的影响较小,均能满足球团矿常规生产工艺要求。 在除尘灰配比≤0. 6% 时,成品球团矿的抗压强度随配比增加而逐渐升高,满足高炉冶炼要求;但当配比超过 0. 4% 时,焙烧过程中球团之间会发生黏结,且配比越高黏结情况越严重,影响正常生产。 值得关注的是,炼焦除尘灰的配加显著优化了成品球团矿的冶金性能,有效改善了低温还原粉化指数并显著降低了还原膨胀率。 这一积极作用可显著减少高炉炼铁过程中球团矿还原阶段产生的粉末量,有力保障高炉内料柱的透气性与高炉生产的长期稳定顺行。 本文成果可为钢铁企业高效、环保地消纳炼焦除尘灰提供切实可行的技术途径与理论依据。

    Abstract:

    In order to realize the resource utilization of coking and dust removal ash and explore its feasibility as a raw material for pellets,the effects of coking and dust removal ash on key quality indicators such as fresh pellets,dry pellets and finished pellets in the pelletizing process are systematically investigated, and the technical scheme for industrial application is determined. The test uses Ansteel’s magnet concentrate as the main raw material,and mixes coking and dust removal ash in different proportions for pellets preparation and roasting. The results show that the combination of coking and dust removal ash has little effect on the quality indexes of fresh pellets and dry pellets,and could meet the requirements of the conventional production process of pellets. The compressive strength of the finished pellets gradually increases with the increase of the ratio when the dust removal ash ratio ≤ 0. 6% , which meets the requirements of blast furnace smelting. However,when the ratio exceeds 0. 4% ,the roasting process will lead to bonding between pellets,and the higher the ratio,the more serious the bonding will be,affecting normal production. It is worth noting that the addition of coking and dust removal ash significantly optimizes the metallurgical performance of finished pellets, effectively improves the low- temperature reduction degradation index (RDI) and significantly reduces the reduction swelling index (RSI). This positive effect can significantly reduce the amount of powder produced in the pellets reduction stage during the blast furnace ironmaking process,effectively ensuring the breathability of the blast furnace inner column and the long-term stability and forward progress of blast furnace production. This paper can provide a practical technical approach and theoretical basis for the efficient and environmentally friendly consumption of coking and dust removal ash by iron and steel enterprises.

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徐礼兵,刘杰,解丹萍,周明顺,张辉,靳珣.炼焦除尘灰制备球团矿的工艺优化试验[J].烧结球团,2025,50(4):73-80

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  • 收稿日期:2024-08-14
  • 最后修改日期:2024-09-09
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  • 在线发布日期: 2025-11-06
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