Al2O3对不锈钢渣中铬富集行为的影响机制

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Al2O3对不锈钢渣中铬富集行为的影响机制

操龙虎1，赵青2

(1.中冶南方工程技术有限公司，湖北武汉 430223；2.东北大学冶金学院，辽宁沈阳 110819)

接受日期:1900-01-01 出版日期:2019-10-05

Influence of Al2O3modification on enrichment behavior of chromium in stainless steel slag

Accepted:1900-01-01 Online:2019-10-05

摘要/Abstract

摘要： 分析了Al2O3对不锈钢渣中铬富集行为的影响，并系统探究了Al2O3对铬富集行为的影响机制。试验过程中所用的合成渣在1600℃条件下保温30min后充分熔化，并水冷。采用SEM-EDS和XRD观察不同Al2O3含量下不锈钢渣的微观形貌和铬的赋存行为。结果表明：不锈钢渣中Al2O3质量分数为4%和8%时，渣中析出的主要物相为尖晶石和蔷薇辉石相，且大量的铬仍赋存于液相和蔷薇辉石相中。当Al2O3质量分数增加到12%时，蔷薇辉石相减少，并逐步转变为液相，液相和蔷薇辉石相中的铬也逐步向尖晶石相中迁移，有利于铬的富集。随着渣中Al2O3含量的增加，尖晶石相中铝元素会逐渐取代尖晶石中的铬元素，从而降低了复合尖晶石Mg(Cr，Al)2O4中MgCr2O4的活度，从而为铬向尖晶石富集提供了热力学驱动力。

关键词: 不锈钢渣, 尖晶石, Al2O3, 铬, 影响机制

Abstract: The influence of Al2O3 modification on the enrichment behavior of chromium was analyzed，meanwhile，the enrichment mechanism was deeply investigated. The samples were heated to 1600°C and holding 30min for melting completely before quenching in water. The microstructure and occurrence behavior of chromium were analyzed by X-ray powder diffraction (XRD) and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). The precipitation behavior of spinel phase was also conducted. The results showed that the main mineral phase in stainless steel slag with 4% and 8% Al2O3 content were spinel and merwinite phase，large amount of chromium was still existed in liquid and merwinitephase. As Al2O3 content increases to 12%，merwinite phase was gradually disappeared and transformed to liquid phase. Chromium in silicate phases gradually migrated to the spinel phase.Addition of Al2O3was conducive to the precipitation of the spinel phase and gradually replacing chromium in spinel phase. Thus，the activity of MgCr2O4 in Mg(Cr，Al)2O4 decreased through Al2O3 modification treatment，which provided thermodynamic driving force for enrichment of chromium in spinel.

Key words: stainless steel slag, spinel, Al2O3, chromium, influence mechanism

操龙虎1，赵青2. Al2O3对不锈钢渣中铬富集行为的影响机制[J]. 炼钢.

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Al2O3对不锈钢渣中铬富集行为的影响机制

Influence of Al2O3modification on enrichment behavior of chromium in stainless steel slag

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