摘要:
钢渣中存在的游离氧化镁易发生水化膨胀导致其安定性不良,限制了钢渣部分替代水泥制备胶凝材料的回收利用.本文优化了氯化铵-乙二醇滴定检测f-MgO的方法,研究表明以RO相和镁铁尖晶石相存在的氧化镁以及钢渣中的其他组分对f-MgO含量的检测干扰较小,测试数据准确度高,为钢渣安定性的判断提供了依据.同时,采用以铁尾矿和石灰石组成的改性剂对转炉钢渣进行改性,经1350℃高温改性和水冷处理后,其中f-MgO含量可由2.02%降低至0.89%,降幅达55.94%.高温改性可以显著降低游离氧化镁的含量,有助于改善钢渣安定性.
关键词:
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钢渣
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安定性
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游离氧化镁
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滴定
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高温改性
Abstract:
The poor stability derives from the hydration expansion of free periclase,which hinders the recycled utilization of steel slag as a partial replacement of cement.In the study,ammonium chloride-glycol extraction method has been optimized to determine precisely f-MgO content in steel slag.The results indicate that MgO component existing as RO and MgFe2O4 phase as well as other compositions in BOF slag show no influence on extraction and titration process,demonstrating the high accuracy of the method.Moreover,the mixture of iron tailings and limestone were used to modify the slag at high temperature.Under the modification at 1350℃ and water-cooling treatment,the free periclase content was decreased by 55.94%,from 2.02% to 0.89%.The results indicate that high temperature modification is a promising way to reduce significantly the content of f-MgO and improve the stability of BOF slag.
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