Effects of Fluoride and Sulphate Mineralizers on the Properties of Reconstructed Steel Slag
Effects of Fluoride and Sulphate Mineralizers on the Properties of Reconstructed Steel Slag
复制标题
氟化物和硫酸盐矿化剂对再生钢渣性能的影响
DOI：
10.1515/htmp-2019-0036
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发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Chen-guang Hu
中科院分区：
文献类型：
--
作者：
Ying Xu;Shan-shan Yang;Qiao-ling Wang;Chen-guang Hu
摘要 通过热重构提高钢渣胶凝活性和体积稳定性是钢渣高效利用的创新方法。本研究根据重构反应所需掺合料的不同，在钢渣中添加不同量的CaF2和CaSO4作为矿化剂，研究CaF2和CaSO4对重构钢渣胶凝活性和体积稳定性的影响。结果表明，当CaF2含量增加至5wt%时，重构钢渣的胶凝活性指数逐渐提高至92%，比国家标准规定的一级技术要求提高了12%，游离CaO（f-CaO）和MgO（f-MgO）含量逐渐下降至0.35和0.13wt%。随着CaSO4含量的增加，胶凝活性指数先增大后减小，而f-CaO和f-MgO含量则呈现相反的趋势。当CaSO4含量为2wt%时，活性指数为105%，比国家标准规定的一级技术要求高出25%，且f-CaO和f-MgO含量分别达到最低0.44和0.35wt%。
Abstract Improving the cementitious activity and volume stability of steel slag by thermal reconstruction is an innovative method for efficient utilization of steel slag. In this study, different amounts of CaF2 and CaSO4 were added to steel slag as a mineralizer based on the determining admixtures needed for the reconstruction reaction, and the effects of CaF2 and CaSO4 on the cementitious activity and volume stability of the reconstructed steel slag were investigated. The results show that when the CaF2 content is increased to 5 wt%, the cementitious activity index of the reconstructed steel slag gradually increases to 92%, which is 12% higher than the first level technical requirement specified by the national standards, and the free CaO (f - CaO) and MgO (f-MgO) contents gradually decrease to 0.35 and 0.13 wt%, respectively. With increasing CaSO4 content, the cementitious activity index first increases and then decreases, while the contents of f -CaO and f-MgO show the opposite trend. When the CaSO4 content is 2 wt%, the activity index is 105%,which is 25%higher than the first level technical requirement specified by the national standards, and the f -CaO and f-MgO contents reach minima of 0.44 and 0.35 wt%, respectively.
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