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Resource utilization of slag from desulphurization and slag skimming:A comprehensive recycling process of all components

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International Journal of Mining Science and Technology 2022年第3期32卷 585-593页

作者： Xiao Liu Peng Gao Yuexin Han School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China School of Chemical&Environmental Engineering Shandong University of Science&TechnologyQingdao 266590China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

In order to make the slag from desulphurization and slag skimming(SDSS)to be comprehensively recycled and utilized,a combined process of beneficiation and building materials preparation was proposed to recover iron from SDSS,meanwhile to apply the remaining slag tailings as cement admixture.From this process,three iron-rich products were recovered in stages by clean gravity-magnetic separation,slag tailings were left.Slag powder was prepared by ultrafine grinding of slag tailings.The stability,setting time and cement mortar strength of the slag tailings cements(STC)which were mixed with Portland cement and slag powder were studied respectively.The results showed that a proper overall performance still could be obtained at the slag powder content of 30%.Chemical composition analysis,X-ray diffraction(XRD)analysis,metallographic microscope and scanning electron microscope(SEM)analysis were employed to assess the characteristics of the SDSS and the products obtained from the whole process.The results indicated that the three iron-rich products could be used as a raw material for steelmaking and ironmaking and the relatively large amount of calcium silicate(C_(2)S)and tricalcium silicate(C_(3)S)in the slag tailings make the addition of slag powder into the Portland cement feasible.

关键词： Desulphurization and slag skimming Beneficiation Iron-rich products Cement admixture cementing property

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Effects of Quicklime and Iron Tailings as Modifier on Composition and Properties of Steel Slag

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Journal of Iron and Steel Research(International) 2015年第1期22卷 15-20页

作者： Zuo-shun ZHANG Fang LIAN Lai-jun MA Yu-sheng JIANG School of Materials Science and Engineering University of Science and Technology Beijing Research and Design Department Beijing Jinyu Mangrove Environmental Protection Technology Co.Ltd.

Steel slag had lower activity and much lower hydration rate than cement. Quicklime and iron tailings were designed as modification agent to adjust the composition and properties of high temperature steel slag. The results show that quicklime as modifier can greatly increase the content of cementitious minerals in modified steel slag and also promote the decomposition of RO phases and transformation of MgO in RO phase to f-MgO. After high temper- ature modification with compound modifier of quicklime and iron tailings, steel slag shows the main mineral phases of C3S, C2F and MgFe2O4. The activity index of modified steel slag at 28 days reaches 95.5% when the steel slag is modified by 15% of the compound modifier with the ratio of quicklime to iron tailings equal to 2 ： 1 at 1 350 ℃. Mo- reover, the sample with the modified steel slag exhibits the dense structure of hydration paste and the main hydration products of C-S-H gels and Ca（OH）2 crystals.

关键词： modifier steel slag mineral composition microstructure cementing property

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