碱度对不锈钢渣中铬的迁移及富集行为的影响

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• 英文论文题名：Effect of Basicity on Migrant and Enrichment Behavior of Chromium in Stainless Steel Slag
• 论文作者：操龙虎 ; 刘承军 ; 赵青 ; 姜茂发
• 英文论文作者：Cao Longhu ; Liu Chengjun ; Zhao Qing ; Jiang Maofa ; Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) ; Northeastern University ; School of Metallurgy ; Northeastern University
• 年：2016
• 作者机构：东北大学多金属共生矿生态化冶金教育部重点实验室;东北大学冶金学院;
• 论文关键词：不锈钢渣 ; 尖晶石 ; 富集度 ; 碱度 ; 铬
• 英文论文关键词：stainless steel slag ; spinel ; enrichment degree ; basicity ; chromium
• 会议召开时间：2016-05-19
• 会议录名称：第十九届（2016年）全国炼钢学术会议大会报告及论文摘要集
• 语种：中文
• 分类号：TF764.1
• 学会代码：ZGJS
• 会议名称：第十九届（2016年）全国炼钢学术会议
• 会议地点：中国湖南长沙
• 主办单位：中国金属学会炼钢分会
• 学会名称：中国金属学会
• 页数：1
• 文件大小：57k
• 原文格式：O
• 会议级别：全国

摘要

铬元素的赋存行为对不锈钢渣中铬的稳定性有重要的影响,而尖晶石相被认为是最佳的铬稳定相。为了有效稳定不锈钢渣中的铬元素,减少污染的风险。本实验研究了不同碱度条件下铬的迁移及富集行为。实验过程中所用的合成渣在1600℃条件下充分熔化后,然后分别在1600℃和1300℃下保温30min后进行水冷,并采用SEM-EDS及XRD观察不同碱度下不锈钢渣的物相组成和铬的赋存形式。结果表明:碱度能显著影响铬的迁移及富集行为,实验中碱度为1.5时有利于不锈钢渣中的铬富集于尖晶石相,在1300℃条件下,铬的富集度接近100%。碱度为1.0时,铬主要溶解于液相中,1300℃条件下冷却只有少量的含铬尖晶石相生成。当碱度为2.0时,有含铬的方镁石相析出。
The existential state of chromium has a great influence on stability of chromium in stainless steel slag,and spinel phase is considered to be the optimal stable phase for preventing the chromium from leaching.In order to effectively enrich chromium,in the present work,the effect of slag basicity on the migration and enrichment behavior of chromium was investigated in the experiment.The samples were heated for 30 min at 1600° C for completely melting and soaking for 30 min at 1600° C and 1300° C before quickly quenched in water.The microstructure and existential state of chromium were determined by scanning electron microscope-energy dispersive spectroscopy(SEM-EDS) and X-ray powder diffraction(XRD).The results showed that the basicity significantly influenced the migrant and enrichment behavior of chromium in stainless steel slag.It was beneficial to enrich the chromium in spinel phase with CaO/SiO_2 ratio of 1.5,especially at 1300℃,the enrichment degree of chromium was nearly up to100%.When the basicity was 1.0,the solubility of chromium in the liquid phase was relatively high,and only minor amount of spinel phase could be formed at 1300℃.As the basicity increased to 2.0,the chromium-bearing periclase phase was precipitated.

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