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Preparation and properties of silane coupling agent modified steel slag as functional filler for anti-corrosion coating

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Journal of Iron and steel Research(International) 2023年第4期30卷 708-716页

作者： Wei-cheng Zheng Wei-cheng Xu Hao Zhang Hao-xuan Zheng Lin Wang Zheng-ming Cheng Yan-fei Ye Jun Lin Hong-ming Long School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Anhui University of Technology) Ministry of EducationMa’anshan 243002AnhuiChina School of Civil Engineering and Architecture Anhui University of TechnologyMa’anshan 243032AnhuiChina Department of Chemical and Biochemical Engineering Western UniversityLondonON N6A 3K7Canada Shanghai Baosteel New Building Materials Technology Co. Ltd.Shanghai 201900China Shougang Jingtang United Iron&steel Co. Ltd.Tangshan 063200HebeiChina Zhanjiang Baosteel New Building Materials Technology Co. Ltd.Zhenjiang 524047GuangdongChina Guilin Hongcheng Mining Equipment Manufacture Co. Ltd.Guilin 541000GuangxiChina

The chemical composition and high wear resistance of steel slag(SS)make it a potential alternative to traditional inorganic fillers.3-Aminopropyltriethoxysilane(KH550)modified steel slag(MSS)was successfully prepared,and its application in epoxy(EP)anti-corrosion coating was introduced.Due to the grafting of silane coupling agent functional groups onto the surface of SS,MSS exhibited improved solubility in xylene organic solvent and reduced agglomeration.When the MSS content was 15 wt.%,the contact angle of the MSS/EP composite coating was 101°,and the abrasion was only 0.07 g,compared with 56.2°and 0.13 g,respectively,for the pure EP coating.The corrosion resistance of coatings was investigated by performing the electrochemical test(impedance)after immersion in a 3.5 wt.%NaCl solution.The electrochemical test results showed that the impedance modulus of the 15 wt.%MSS/EP composite coating at low frequency(Z_(f)=0.01 Hz)was approximately 1.08×10^(7)Ωcm^(2),which was two orders of magnitude higher than that of the pure EP coating.

关键词： steel slag Silane coupling agent Modification Epoxy coating Inorganic filler

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Mechanical properties and durability of alkali-activated steel slag-blastfurnace slag cement

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Journal of Iron and steel Research(International) 2023年第7期30卷 1342-1355页

作者： Jing-xiong Zhong Li-ying Cao Mei Li Shu-ping Wang Fang Liu Xue-wei Lv Xiao-qin Peng College of Materials Science and Engineering Chongqing UniversityChongqing 400045China Shanghai Baosteel New Building Materials Technology Co. Ltd.Shanghai 200940China Zhoushan Putuo District Housing and Urban Rural Development Bureau Zhoushan 316199ZhejiangChina

Alkali-activated cement(AAC)is either clinker-less or free,and it is also environmentally friendly due to its low carbon footprint and wide range sources.Industrial wastes,like steel slag and blastfurnace slag,usually have latent hydraulic reactivity,and can be used as precursors of AAC.Both clinkerless and clinker-free AAC were prepared from the mixture of steel slag and blastfurnace slag by using water glass as an activator,and four different recipes which satisfied the strength requirement of 42.5R Portland cement were obtained.Each recipe of AAC exhibited better resistance to sulfate attack and frost attack than Portland cement.AAC showed huge drying shrinkage,but it was equivalent to that of Portland cement as steel slag content increased to 40%.The AAC also had quite low risk of alkali-aggregate reaction.Microstructure analysis showed that the major products were calcium silicate hydrate(C–S–H),calcium aluminosilicate hydrate(C–A–S–H)and zeolite-like phases.Ettringite was also detected in the binder when gypsum was contained in the precursors.

关键词： Alkali-activated cement steel slag Blastfurnace slag Durability Mechanical property

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Research on the Low-carbon Cementitious Materials:Effect of Triisopropanolamine on the Hydration of Phosphorous slag and steel slag

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Journal of Wuhan University of Technology(Materials Science) 2023年第6期38卷 1348-1359页

作者： ZHANG Ting MA Baoguo XIA Yu State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Surveying&Testing Shaanxi Railway InstituteWeinan 714000China

Cement,phosphorous slag(PS),and steel slag(SS)were used to prepare low-carbon cementitious materials,and triisopropanolamine(TIPA)was used to improve the mechanical properties by controlling the hydration process.The experimental results show that,by using 0.06%TIPA,the compressive strength of cement containing 60%PS or 60%SS could be enhanced by 12%or 18%at 28 d.The presence of TIPA significantly affected the hydration process of PS and SS in cement.In the early stage,TIPA accelerated the dissolution of Al in PS,and the formation of carboaluminate hydrate was facilitated,which could induce the hydration;TIPA promoted the dissolution of Fe in SS,and the formation of Fe-monocarbonate,which was precipitated on the surface of SS,resulting in the postponement of hydration,especially for the high SS content.In the later stage,under the continuous solubilization effect of TIPA,the hydration of PS and SS could refine the pore structure.It was noted that compared with portland cement,the carbon emissions of cement-PS-TIPA and cement-SS-TIPA was reduced by 52%and 49%,respectively.

关键词： phosphorous slag steel slag high content trisopropanolamine hydration process lowcarbon emissions

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High-temperature modification and air-quenching granulation of steel slag

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Journal of Iron and steel Research(International) 2022年第5期29卷 783-792页

作者： Hui Wang Chao Liu Hong-wei Xing Jin-hu Wu Wen-long Lin Shuo Li Guo-hui Ding Yu-zhu Zhang College of Metallurgy and Energy North China University of Science and TechnologyTangshan063200HebeiChina steelmaking Operation Department Shougang Jingtang United Iron&Steel Co.Ltd.Tangshan063200HebeiChina

To solve the problem of difficult utilization of steel slag,the liquid steel slag was modified and the air-quenching granulation process was carried out to make steel slag into a value-added end product:air-quenching granulated steel slag.The granulated slag was tested to analyze the variation rule of slag properties under different modification conditions.Based on the phase diagram of CaO–Si_(2)O–FeO–MgO–Al2O3 slag system,the feasibility of blast furnace(BF)slag as modifier was determined.When the addition of BF slag was increased from 0%to 35%,following results were obtained.The slag fluidity was improved,and the air-quenching temperature range was expanded.Then,the yield of air-quenched steel slag increased,while the granulation rate,the degree of sphericity,the compactness were decreased.Furthermore,the air-quenching granulation process could substantially improve the stability and the amorphous content of steel slag.The maximum removal rate of free CaO was above 80%and the amorphous content was up to 95%.Taking the factors of yield and properties of granulated steel slag into full consideration,the optimum proportion of BF slag is around 15%.

关键词： steel slag Modification Air-quenching granulation Free CaO Amorphous Property

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Preparation and properties of flame-retardant rubber composites based on steel slag filler

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Journal of Iron and steel Research(International) 2023年第7期30卷 1334-1341页

作者： Wei-cheng Xu Wei-cheng Zheng Ling Zhao Hao-tian Wu Yu-xi Wu Hai-li Li Hao Zhang Hong-ming Long Key Laboratory of Metallurgical Emission Reduction and Comprehensive Utilization of Resources Ministry of EducationAnhui University of TechnologyMa’anshan 243002AnhuiChina School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina School of Civil Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina

Ultrafine steel slag powder(shield powder)was prepared by grinding ordinary steel slag with a functional compound.As a substitute for aluminum hydroxide,the shield powder was combined with rubber to prepare flame-retardant composites.Vulcanization tests showed that the incorporation of shield powder enhances the crosslinkage of the composite and speeds up the curing rate.The gaseous products formed in the pyrolysis process are mainly hydrocarbons.Mechanical and combustion tests revealed that the introduction of shield powder improves flame-retardant performance without sacrificing mechanical properties.Specifically,the optimum substitution ratio of shield powder for aluminum hydroxide is 50.0%.In this case,the composite has the highest degree of graphitization and exhibits excellent flame-retardant performance.

关键词： steel slag Rubber Surface modification Solid waste utilization Flame-retardant composite

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Reactions of Chromium during the Calcination of Cement Clinker Produced Using steel slag

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Journal of Wuhan University of Technology(Materials Science) 2023年第4期38卷 834-841页

作者：何晨海 YAN Bo LI Fuzhou School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China Wuhan Rungong Technology Company Limited Wuhan430070China

We investigated the effects of calcination temperature(950-1450℃),steel slag content,and the total chromium content of steel slag on the Cr^(6+)contents of clinker samples produced using steel slags with different chromium contents.Additionally,the reactions of chromium in clinker(produced using steel slag)during calcination were studied.It is found that Cr^(6+)conversion increases with increasing calcination temperature to 1250℃,reaching a maximum of 43%-79%,before decreasing to 18%-42%at 1450℃.Cr^(6+)is mainly formed by the oxidation of trivalent chromium(Cr^(3+))during the solid-phase reaction stage of clinker calcination.Furthermore,the Cr^(6+)content of a clinker sample is proportional to the chromium content of its raw meal precursor and is mainly in the form of water-insoluble calcium chromate(CaCrO_(4)).The chromium in clinker is mainly distributed in tricalcium aluminate and tetracalcium aluminoferrite,however,some is present in silicate minerals.We expect to inform the monitoring and control of the Cr^(6+)content of clinker(produced using steel slag)and resulting cement.

关键词： chromium cement clinker steel slag hexavalent chromium reaction characteristics

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Cleaner geopolymer prepared by co-activation of gasification coal fly ash and steel slag:durability properties and economic assessment

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Frontiers of Environmental Science & Engineering 2023年第12期17卷 109-121页

作者： Xian Zhou Xia Chen Ziling Peng Yongmen Zhou Yan Li Wang Jian Zeyu Fan Yuchi Chen Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan 430010China Jiangxi Research Center on Hydraulic Structures Jiangxi Provincial Institute of Water SciencesNanchang 330029China Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Geopolymer is a material with high early strength.However,the insufficient durability properties,such as long-term strength,acid-base resistance,freeze-thaw resistance,leaching toxicity,thermal stability,sulfate resistance and carbonation resistance,restrain its practical application.Herein,a longterm stable geopolymer composite with high final strength(ASK1)was synthesized from shell coal gasification fly ash(SFA)and steel slag(SS).Additionally,a geopolymer composite with high early strength(ASK2)was also synthesized for comparison.The results showed that ASK1 exhibited better performance on freezing-thawing resistance,carbonization resistance and heavy metals stabilization compared to the ASK2 at long-term curing.Raising the curing temperature could accelerate the unconfined compressive strength(UCS)development at initial curing ages of 3 to 7 d.Both ASK1 and ASK2 exhibited excellent acid-base and sulfate corrosion resistance.An increase for UCS was seen under KOH solution and MgSO_(4)solution corrosion for ASK1.All leaching concentrations of heavy metals out of the two geopolymers were below the standard threshold,even after 50 freezingthawing cycles.Both ASK1 and ASK2 geopolymer concrete exhibited higher sustainability and economic efficiency than Portland cement concrete.The result of this study not only provides a suitable way for the utilization of industrial solid waste in civil and environmental engineering,but also opens a new approach to improve the long-term stabilities of the geopolymers.

关键词： Geopolymer Shell coal gasification fly ash steel slag Heavy metal Solidification/stabilization Durability

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Workability and Strength of Ceramsite Self-Compacting Concrete with steel slag Sand

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Journal of Renewable Materials 2023年第2期11卷 881-904页

作者： Suiwei Pan Anqi Ren Yongli Peng Min Wu Wanguo Dong Chunlin Liu Depeng Chen School of Construction Engineering Ma’anshan UniversityMa’anshan243100China School of Architectural and Civil Engineering Anhui University of TechnologyMa’anshan243032China School of Management Science and Engineering Anhui University of TechnologyMa’anshan243032China

This study focuses on the workability and compressive strength of ceramsite self-compacting concrete with fine aggregate partially substituted by steel slag sand(CSLSCC)to prevent the pollution of steel slag in the environment.The SF,J-ring,visual stability index,and sieve analysis tests are primarily employed in this research to investigate the workability of freshly mixed self-compacting concrete containing steel slag at various steel slag sand replacement rates.The experiment results indicate that CSLSCC with the 20%volume percentage of steel slag(VPS)performs better workability,higher strength,and higher specific strength.The 7-day compressive strength of CSLSCC with the 0.4 of the water-binder ratio(W/B),decreases with the increase of steel slag content,while the 28-day compressive strength increases significantly.The ceramsite self-compacting concrete with good comprehensive performance can be obtained when the substitution rate of steel slag sand for fine aggregate is less than 20%(volume percentage).

关键词： steel slag ceramsite self-compacting concrete workability compressive strength

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Mechanical Performance and Micro-structure of Pore steel slag Block Prepared by Accelerated Carbonation

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 475-481页

作者：陈万超刘鹏 WANG Fazhou HU Chuanlin HU Shuguang School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430079China

steel slag contains a large amount of calcium silicate,which can react with CO_(2)to generate CaCO_(3)and SiO_(2)colloid,thus steel slag may become a cementitious material with a certain strength.High strength porous steel slag carbonated brick was prepared by adding easily decomposed bicarbonate solid into steel slag as pore-forming agent and then accelerating carbonation.A variety of characterization methods were used to characterize the composition and micro-structure of the samples.The effects of different pore-forming agent dosage and carbonation time on the properties of pore steel slag blocks were discussed.The results show that the addition of ammonia bicarbonate promotes the nucleation and growth of columnar calcite.The strength of steel slag block mixed with 30%pore forming agent can reach 24.8 MPa after 1 day of carbonation,and then the strength development tends to slow down.

关键词： steel slag accelerating carbonation pore-forming ammonia bicarbonate calcite

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Optimization of Mineralization Curing System for Efficient and Safe Utilization of steel slag Wastes

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Journal of Wuhan University of Technology(Materials Science) 2022年第4期37卷 595-602页

作者：伊海赫 ZHAN Qiwei YU Xiaoniu School of Civil and Architectural Engineering Shandong University of TechnologyZibo 255000China School of Civil Engineering and Architecture Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Civil and Environmental Engineering Nanyang Technological UniversitySingapore City 639798Singapore

The crystal structure and morphology of the mineralization products were studied by scanning electron microscopy(SEM)and X-ray diffraction(XRD),and the thermal properties were studied by thermogravimetric-differential scanning calorimetry(DSC)analysis.The changes of microorganism quantity and enzyme activity in pore solution with time were measured.The experimental results show that microorganism quantity and enzyme activity in pore solution reach the maximum at 50-60 h,mineralization curing begins at this time,the strength of microbial mineralized steel slag reaches the maximum.This study provides a good selection basis for selecting the optimum mineralization system for the production of microbial mineralized steel slag products.Bacterial mineralization can accelerate the rate of carbon sequestration in the mineralization process.The compressive strength of steel slag with 1.5% bacterial can reach up to 55.6 MPa.The microstructure and thermal properties of calcium carbonate precipitate induced by the enzymes of bacillus subtilis differs from the chemical precipitation in pore solution of steel slag.Through the analysis of the mineralized products of steel slag,the reaction rate of free calcium oxide and free magnesium oxide in steel slag after the addition of microorganisms is significantly increased,which improves the stability of steel slag as cementitious material.Meanwhile,the production of calcium carbonate,the main mineralized product,is significantly increased.

关键词： steel slag microorganism bio-mineralization enzyme activity curing system

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