Abstract: teel slag is a by-product of the steelmaking process, and its yield are about 15% of steel production. The recycling of steel slag is one of the key issues that steel companies need to solve. With its composition characteristics, a small amount of steel slag has been used in metallurgy, engineering backfilling, road construction, sewage treatment and preparation of glass-ceramics. Besides, the incorporation of steel slag into cement to prepare steel slag cement is an effective and efficient way to use. However, the existence of wustite phase, which is difficult to separate in steel slag, limits its application in the field of building materials. The oxidative modification can transform the wustite in the steel slag to the ferromagnetic magnetite, and there is no greenhouse gas emission during the upgrading process. The oxidative upgrading process of CaO-SiO2-FeO system steel slag has been studied in the past, but the CaO-SiO2-FeO-MgO system which is closer to the actual steel slag composition has relatively less research. In addition, the nucleation and growth mechanism of the magnesioferrite spinel in the oxidation process still needs further exploration. This work refers to the actual composition of the converter steel slag of a steel plant, and the solidification of the steel slag is carried out by calcination under an oxidizing atmosphere (Synthetic air). X-ray diffraction (XRD) analysis, backscattered scanning electron microscopy (BEI-SEM) and X-ray energy dispersive spectroscopy (EDS) were used to analyze the mineral phase products of CaO-SiO2-FeO-MgO system synthesis slag, combined with thermodynamics. The calculation software (FactSage 7.0) was used to study the thermodynamic trends of the main product phase formation. In addition, simultaneous thermal analyzer (TG-DSC) was carried out to study the kinetic mechanism of the formation of magnesioferrite spinel, and the corresponding kinetic model was also established. The results show that with the solid phase reforming temperature rising from 1 000 ℃ to 1 150 ℃, the yield of magnesioferrite spinel increases first and then decreases, and reaches a maximum value when the upgrading temperature is 1 100 ℃. The magnesioferrite spinel changes in the (311) crystal plane corresponding to the diffraction angle as follows: 2θ=35.44° (1 000 ℃)→2θ=35.49° (1 050 ℃)→2θ=35.49° (1 100 ℃)→2θ=35.43°(1 150 ℃). With the oxidation temperature increa-sing from 1 000 ℃ to 1 150 ℃, the weight gain of the 600 s oxidation system increases from 351.273×10-3 mg to 499.077×10-3 mg, and the weight gain of the 1 800 s oxidation system increases from 364.390×10-3 mg to 535.341×10-3 mg. According to the kinetic mechanism, the solid phase modification process of CaO-SiO2-FeO-MgO quaternary system can be divided into three stages: initial stage, chemical reaction phase and diffusion phase. The theoretically calculated kinetic model is well consistent with the thermogravimetric change trend of the TG experimental results. The kine-tic model can accurately describe the nucleation and growth process of the magnesium iron spinel during the solid phase reforming of steel slag.
作者简介: 蒋亮,北方民族大学讲师,于中国建筑材料科学研究总院获得材料学工学博士学位,在国内外学术期刊上发表论文30余篇,其中SCI/EI检索10余篇。研究工作主要围绕工业废弃物的循环利用,开展关于钢渣、镁渣和锰渣等固体废弃物中有益金属的提取及尾渣的综合利用。2016—2017年以访问学者身份进入瑞典吕勒奥工业大学(Lule University of Technology,LTU)进行交流学习,参与了瑞典“MISTRA”的“CEMENT”课题研究的相关工作,并在该项目结题后继续参与了瑞典创新署“VINOVA”的资助的中瑞合作项目“BackFillStab”和有色冶金渣循环的项目“IQ-Slag”的相关研究工作。主持和参与了包括国家自然科学基金、宁夏科技支撑项目、宁夏自然科学基金以及国际合作专项等多项科研项目。 陈宇红,北方民族大学教授,硕士研究生导师。1990年毕业于陕西师范大学化学系。其中1998—1999年到意大利都灵工业大学进行访问、合作研究。在国内外学术期刊上发表论文60余篇,申请国家发明专利10项,其中授权4项。其主要研究方向包括:超高温材料,高温物理化学。负责完成科研项目10多项,包括国家 “863”项目和国家自然科学基金项目及省部级项目。获省级科技进步奖三等奖一项。
引用本文:
蒋亮, 李佳欣, 吴婷, 杨车, 尹伟杰, 韩凤兰, 陈宇红. CaO-SiO2-FeO-MgO体系钢渣固相改质过程中的镁铁尖晶石生长机理[J]. 材料导报, 2019, 33(15): 2490-2496.
JIANG Liang, LI Jiaxin, WU Ting, YANG Che, YIN Weijie, HAN Fenglan, CHEN Yuhong. Growth Mechanism of Magnesioferrite Spinel in Solid Phase Modification of CaO-SiO2-FeO-MgO System. Materials Reports, 2019, 33(15): 2490-2496.
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2019, Vol. 33 
