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Mechanical properties and energy evolution characteristics of magnesium slag-blast furnace slag-based backfill with different curing ages and magnesium slag contents 认领 引用
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作者 YANG Xiao-bing YANG Jian +6 位作者 WANG Xi YIN Sheng-hua ZHANG Xi-zhi LI Gong-cheng CHEN Xun QI Yao-bin CHEN Wei 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第5期2360-2385,共26页
Utilizing solid waste resources and lowering backfill costs are made possible by the preparation of cementitious materials as cement substitutes using magnesium slag(MS)and blast furnace slag(BFS).Uniaxial compression... Utilizing solid waste resources and lowering backfill costs are made possible by the preparation of cementitious materials as cement substitutes using magnesium slag(MS)and blast furnace slag(BFS).Uniaxial compression tests were carried out on MS-BFS-based backfill with different MS contents(20%,30%,40%,and 50%)and curing ages(3,7,and 28 d)to investigate their effects on the mechanical properties and energy evolution characteristics of the MS-BFS-based backfill.The coupled effects of curing age and MS content on the compressive strength and elastic modulus of the MS-BFS-based backfill are discussed.The energy damage evolution characteristics,energy distribution characteristics,and energy indexes at the peak stress point of the MS-BFS-based backfill were examined,and an energy damage constitutive model was constructed based on energy dissipation.The results show that with increasing curing age,the brittleness of the MS-BFS-based backfill specimen itself is gradually enhanced.With increasing MS content,the post-peak brittle deformation capacity of the MS-BFS-based backfill at all curing ages is enhanced,while post-peak plasticity diminishes.A moderate amount of MS(30%)improves the strength properties of the backfill and provides similar enhancement at all curing ages.On the 28th day,the strength and elastic modulus of the backfill with 30%MS content can reach 7.677 and 1317.063 MPa,respectively.The established two-factor coupling function can better represent the coupled effect of curing age and MS content on the mechanical parameters and energy indexes of the MS-BFS-based backfill.After introducing the pre-peak compaction coefficient,the damage constitutive model based on energy dissipation effectively characterizes the stress−strain behavior of the MS-BFS-based backfill.The findings can provide support for the application and stability analysis of MS-BFS-based backfill. 展开更多
关键词 solid waste resource utilization magnesium slag-blast furnace slag-based backfill magnesium slag content mechanical properties energy damage evolution coupled effects
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Regeneration of metallic magnesium from magnesium slag through a synergistic vacuum carbothermal reduction and CaF2 catalytic strategy 认领 引用
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作者 Tingzhuang Ma Bin Yang +6 位作者 Yang Tian Baoqiang Xu Guozheng Zha Lipeng Wang Shuji Wu Haosong Yu Rong Yu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第5期545-556,共12页
Amid the continuing rise in global demand for magnesium metal,the considerable reserves of magnesium within magnesium slag remain insufficiently recovered,resulting in notable resource wastage and increased vulnerabil... Amid the continuing rise in global demand for magnesium metal,the considerable reserves of magnesium within magnesium slag remain insufficiently recovered,resulting in notable resource wastage and increased vulnerability to supply chain instability.Current mainstream approaches for the comprehensive utilization of magnesium slag have yet to demonstrate feasibility for large-scale industrial deployment.In this work,a novel synergistic activation approach—vacuum carbothermal reduction coupled with CaF2 catalysis—is proposed.This method enables precise regulation of key parameters within the reduction system to harness the full potential of the intrinsic Ca2SiO4 phase in magnesium slag.Under high-temperature conditions,Ca2SiO4 interacts in situ with added CaF2 flux to generate a low-melting-point eutectic system,substantially reducing the reaction’s activation energy and accelerating mass transfer.These combined effects promote the efficient reduction of MgO and the highly selective liberation of Mg(g).Experiments show that this technology achieves a MgO reduction rate≥90%in magnesium slag,with a direct collection efficiency rate≥85.14%,and the purity of regenerated crystallized magnesium stabilizes at≥88.18%.Extending the holding time has been proven to have a dual optimization effect:first,by enhancing the catalytic efficiency of CaF2,the MgO reduction efficiency is improved by 5.51%(when the holding time is extended by 1 h);second,it promotes uniform nucleation and equiaxed crystal growth of Mg(g)at only further increasing the purity of crystallized magnesium by+5.24%,but it also significantly enhances its grain integrity and microstructural uniformity.This regenerated magnesium crystal,characterized by high purity and low defect density,provides an excellent microstructural foundation for subsequent plastic forming or service applications. 展开更多
关键词 Magnesium slag Synergistic Comprehensive utilization Crystal integrity Crystallized magnesium
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Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process 认领 引用 被引量：1
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作者 Weixin Zheng Jinmei Dong +4 位作者 Baolan Li Yuanrui Li Qiang Wang Jing Wen Chenggong Chang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第9期294-303,共10页
Magnesium phosphate cements(MPC)have shown promising applications in many fields,but high raw material prices hinder their development.The production of salt lake MPC(SLMPC)from magnesium slag(MS),a byproduct of lithi... Magnesium phosphate cements(MPC)have shown promising applications in many fields,but high raw material prices hinder their development.The production of salt lake MPC(SLMPC)from magnesium slag(MS),a byproduct of lithium extraction from salt lakes,offers significant environmental and economic advantages.In this study,a low-cost magnesia raw material was obtained through the calcination of MS,which was subsequently utilized in conjunction with KH2PO4 to prepare SLMPC.The changes in hydration products,microscopic morphology,solution pH value,and TG content during the SLMPC curing process,and the hydration kinetics equation and model were used to study the hydration processes of SLMPC.The results show that the outcome indicates that the SLMPC system entered the accelerated reaction stage within 6 min after mixing,where the highest heat release rate was 6.29 J·g-1·min-1,the maximum heat release was 205.3 J·g-1,and the main hydration product appeared at 50-60 min.The hydration behavior of SLMPC exhibits similarities to that of traditional MPC.Specifically,the acceleration phase is governed by an autocatalytic reaction,the deceleration phase is influenced by both autocatalytic reactions and diffusion processes,and the stabilization phase is predominantly controlled by diffusion mechanisms.This paper aims to establish the theoretical foundation for the industrial application of MS and the cost-effective production of MPC. 展开更多
关键词 Magnesium phosphate cements Magnesium slag Microstructure Utilization of salt lake resources MgO
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Effect of pre-autoclaving treatment on volume stability and compressive strength of carbonated magnesium slag 认领 引用 被引量：3
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作者 Xin Xu Jinhui Liu +10 位作者 Yuandong Mu Yixin Zhang Yuming Zhao Peixu Yang Weidong Zhang Xiaofeng Li Yong Hu Weineng Tang Jiajia Tian Zhongtao Luo Shaojun Zhang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第11期5637-5651,共15页
The primary magnesium production is accompanied by a large amount of magnesium slag(MS)discharge.The low hydration reactivity of γ-Ca2SiO4(γ-C2S)and MgO in MS results in the volume stability issue and low u... The primary magnesium production is accompanied by a large amount of magnesium slag(MS)discharge.The low hydration reactivity of γ-Ca2SiO4(γ-C2S)and MgO in MS results in the volume stability issue and low utilization rate of MS.To eliminate the issue,this study proposes to pre-autoclave the MS slurry to boost the hydration of γ-C2S and MgO and then utilize their hydration products to prepare cementitious materials by carbonation curing.MgO from MS and prepared γ-C2S are firstly employed as study objects respectively,for they are the main contents of magnesium slag.The results indicate that pre-autoclaving treatment can strongly elevate the hydration degree of MgO from MS,this can substantially solve the volume stability issue of MS.Meanwhile,the pre-autoclaving of γ-C2S induces the generation of crystallized and amorphous C-S-H products,and both products could promote the carbonation reaction when compared to γ-C2S.The carbonation degree of pre-autoclaved MS firstly increases and then decreases with the rising pre-autoclaving temperature,and the optimal pre-autoclaving temperature for MS carbonation is 160℃,at this time,the powdered MS can be simply carbonated fully.The sample made of pre-autoclaved MS and then subjected to 4 h carbonation could achieve the compressive strength of 29 MPa.with good soundness.During volume stability testing,the volume expansion rate of a carbonated MS sample with pre-autoclaving was 0.07%,which is significantly lower than the normal requirement of 0.5%.This research offers a novel approach to utilizing magnesium slag in building materials and contributes to carbon reduction. 展开更多
关键词 Magnesium slag Volume stability Pre-autoclaving Hydration Carbonation
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Basic Properties,Mechanical Properties,Long-Term Durability and Application Prospects of Magnesium Slag Materials 认领 引用
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作者 ZHANG Lu XU Zhiming +3 位作者 LI Hui NIU Ditao ZHOU Yinuo YAN Ziwei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第5期1434-1449,共16页
By using the phased characteristics summarizing method of the existing research on magnesium slag,this study investigates the hydration reaction,alkali activation reaction and CO2 mineralization reaction processes ... By using the phased characteristics summarizing method of the existing research on magnesium slag,this study investigates the hydration reaction,alkali activation reaction and CO2 mineralization reaction processes and mechanisms,and then explores its high-value utilization.The results show that physical and chemical activation can improve the mechanical properties of the gelled material system by increasing the crystal phase defects and surface energy and by reconstructing a new gelling system by depolymerizing glass.The CO2 mineralization reaction of magnesium slag can be used to construct a new gelling system for CaCO3 and calcium-modified silica gel.Magnesium slag can also be used to enhance the dry shrinkage and carbonation resistance of concrete owing to its expansibility and high alkali reserves.The mechanism and existence form of heavy metal ions in magnesium slag have been clarified.The study proposed a production system for magnesium slag and highlighted the potential research value in the field of wet carbonation to promote the application of magnesium slag. 展开更多
关键词 magnesium slag CO2mineralization solid waste mechanical properties durability
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Unveiling the Carbonation Behavior and Microstructural Changes of Magnesium Slag at 0℃ 认领 引用 被引量：1
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作者 Junhao Ye Songhui Liu +2 位作者 Jingrui Fang Xuemao Guan Hui Guo 《Journal of Building Material Science》 CAS 2023年第2期37-50,共14页
Magnesium slag(MS)is an industrial byproduct with high CO2sequestration potential.This study investigates the carbonation behavior and microstructural changes of MS during wet carbonation at 0℃.XRD,TG,FTIR,SEM,and... Magnesium slag(MS)is an industrial byproduct with high CO2sequestration potential.This study investigates the carbonation behavior and microstructural changes of MS during wet carbonation at 0℃.XRD,TG,FTIR,SEM,and BET techniques were used to characterize the phase composition,microstructure,and porosity of MS samples carbonated for different durations.The results showed that the main carbonation products were calcite,vaterite,and highly polymerized silica gel,with particle sizes around 1μm.The low-temperature environment retarded the carbonation reaction rate and affected the morphology and crystallization of calcium carbonate.After 480 min of carbonation,the specific surface area and porosity of MS increased substantially by 740%and 144.6%,respectively,indicating improved reactivity.The microstructure of carbonated MS became denser with calcite particles surrounded by silica gel.This study demonstrates that wet carbonation of MS at 0℃significantly enhances its properties,creating an ultrafine supplementary cementitious material with considerable CO2sequestration capacity. 展开更多
关键词 Wet carbonation Ultrafine supplementary cementitious materials Calcium carbonate Magnesium slag
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Kinetics of Magnesium Slag Leaching by NH4Cl 认领 引用 被引量：1
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作者 MAo Shuaidong LIU yan ZHANG Ting'an 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第5期787-793,共7页
The leaching kinetics of magnesium slag in ammonium chloride solutions was investigated.The effects of initial ammonium chloride concentration,liquid-solid ratio and reaction temperature on the leaching rate of calciu... The leaching kinetics of magnesium slag in ammonium chloride solutions was investigated.The effects of initial ammonium chloride concentration,liquid-solid ratio and reaction temperature on the leaching rate of calcium were determined.The results showed that the leaching rate increased with the increase in initial ammonium chloride concentration,reaction temperature and liquid-solid ratio.It was determined that the leaching rate fit the Avrami equation,and the leaching process was controlled by diffusion.The activation energy was 13.22 kJ/mol. 展开更多
关键词 magnesium slag leaching kinetics ammonium chloride extracting
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Ion Migration Behavior in Magnesium Residue Leached by Microwave-assisted Ammonium Salt 认领 引用
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作者 LIU Yan XIAO Yadong +3 位作者 CHEN Xuegui LI Xiaolong YAN Yanwen ZHANG Tingan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第6期1525-1534,共10页
The thermodynamic analysis of the reaction between the main phase in magnesium slag and NH4Cl solutions was carried out,and the ions leaching behaviors of Ca,Mg,Fe,and Al in magnesium slag under room temperature an... The thermodynamic analysis of the reaction between the main phase in magnesium slag and NH4Cl solutions was carried out,and the ions leaching behaviors of Ca,Mg,Fe,and Al in magnesium slag under room temperature and microwave conditions were compared.Meanwhile,the effects of parameters on the leaching rate of Ca and Mg were investigated under the microwave heating conditions.The experimental results show that,in 273.15-373.15 K,Ca2SiO4,CaSiO3,Ca2Fe2O5,and Mg2SiO4might react with NH4Cl solution,while MgSiO3,MgO,Fe2O3,and Al2O3are difficult to be leached.The leaching rates of Ca and Mg are 70.29%and 24.64%,respectively,when the conditions are 300 W of microwave power,1:20 of solid-liquid ratio,400 mL of 2 mol/L NH4Cl solutions,and 90 min of leaching time.In addition,in the non-isothermal stage,the leaching process of Ca is changed from chemical reaction control to diffusion control,and the leaching rate of Ca gradually increases.However,the leaching process of Mg is always controlled by chemical reaction,and the leaching rate of Mg remains unchanged after the reaction reached equilibrium. 展开更多
关键词 magnesium slag NH4Cl leaching ion-migration behavior microwave heating
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Effect of Magnesium on the C-S-H Nanostructure Evolution and Aluminate Phases Transition in Cement-Slag Blend 认领 引用 被引量：6
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作者 丁庆军 YANG Jun +1 位作者 张高展 HOU Dongshuai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第1期108-116,共9页
The microstructural study was conducted on cement and cement-slag pastes immersed in different concentrations of Mg（NO3）2 solutions utilizing ^29Si, ^27Al NMR spectroscopy and XRD techniques. The results show that t... The microstructural study was conducted on cement and cement-slag pastes immersed in different concentrations of Mg（NO3）2 solutions utilizing ^29Si, ^27Al NMR spectroscopy and XRD techniques. The results show that the hydration of both the cement and cement-slag pastes is delayed when the pastes are cured in Mg（NO3）2 solutions as compared to the pastes cured in water. Moreover, Mg^2＋ ions also exhibit an decalcifying and dealuminizing effect on the C-A-S-H in cement and cement-slag pastes, and thereby decrease Ca/Si and Al[4]/Si ratios of the C-A-S-H. The dealuminization of C-A-S-H is mitigated for cement-slag paste as compared to pure cement paste. The depolymerized calcium and aluminum ions from C-A-S-H gel mainly enter the pore solution to maintain the pH value and form Al^[6] in TAH, respectively. On the other hand, Mg^2＋ ions exert an impact on the intra-transition between Al^[6] species, from AFm and hydrogarnet to hydrotalcite-like phase. NO3^-ions are interstratified in the layered Mg-Al structure and formed nitrated hydrotalcite-like phase（Mg1-xAlx（OH）2（NO3）x·nH2O）. Results from both ^27Al NMR and XRD data show that ettringite seems not to react with Mg^2＋ ions. 展开更多
关键词 ^29Si and ^27Al NMR magnesium ion C-A-S-H microstructure aluminate phases transition hydration slag incorporation
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镁渣对超硫酸盐水泥水化与抗碳化性能的影响 认领 引用 被引量：1
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作者 李想 王栋民 +2 位作者 王吉祥 段开瑞 房奎圳 《硅酸盐学报》 EI CAS CSCD 北大核心 2026年第5期1512-1523,共12页
超硫酸盐水泥(SSC)因自身碱度较低而易受CO2侵蚀。为此,探究了2种富含硅酸钙的镁渣(MS)-MSⅠ(β-C2S高占比)和MSⅡ(γ-C2S高占比)对SSC反应速率(凝结时间和反应热)和抗碳化(3%和20%CO2,体积分数)性能的影响。结果表明,在SS... 超硫酸盐水泥(SSC)因自身碱度较低而易受CO2侵蚀。为此,探究了2种富含硅酸钙的镁渣(MS)-MSⅠ(β-C2S高占比)和MSⅡ(γ-C2S高占比)对SSC反应速率(凝结时间和反应热)和抗碳化(3%和20%CO2,体积分数)性能的影响。结果表明,在SSC中掺入富含β-C2S的MSⅠ延缓了SSC的反应速率、降低了净浆强度,并显著增加了样品在2种碳化浓度下的碳化深度;而富含γ-C2S的MSⅡ并未影响SSC的反应速率,并降低了碳化深度(20%MSⅡ);碳化后,掺入MSⅠ和MSⅡ样品的强度均得到了不同程度的提升,后者更为显著。分析认为,尽管MS中硅酸钙自身的碳化增强了掺镁渣SSC在不同碳化龄期下的抗压强度,但相比MSⅡ,X射线衍射与热重结果均表明,MSⅠ中含有的具有水硬性的β-C2S及少量的Ca(OH)2抑制了碳化前SSC中石膏的溶解和水化产物的生成,导致了对SSC反应速率、抗压强度和碳化深度的负面影响。因而,就抗压强度和碳化深度而言,掺入含低水硬性硅酸钙的MSⅡ更有利于在不影响SSC自身反应速率的前提下,提升SSC对碳化环境的耐受性。 展开更多
关键词 硅酸钙 镁渣 超硫酸盐水泥 水化 抗碳化性能
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镁-煤基全固废充填材料的强度特性及微结构演化研究 认领 引用 被引量：1
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作者 刘浪 袁毅 +6 位作者 王海社 蔚保宁 梁雄 朱梦博 刘彪 胡涛 杨潘 《材料导报》 EI CAS CSCD 北大核心 2026年第2期108-118,共11页
随着煤矿资源开采及深加工,大量的固体废弃物堆存于地表。为了实现矿山绿色开采,推动大宗固废处置利用,采用改性镁渣(MMS)、煤气化渣(CGS)、煤矸石(CG)和脱硫石膏(FDG)四种固体废弃物制备镁-煤基全固废充填材料(M-CSWBM)。分析了M-CSWB... 随着煤矿资源开采及深加工,大量的固体废弃物堆存于地表。为了实现矿山绿色开采,推动大宗固废处置利用,采用改性镁渣(MMS)、煤气化渣(CGS)、煤矸石(CG)和脱硫石膏(FDG)四种固体废弃物制备镁-煤基全固废充填材料(M-CSWBM)。分析了M-CSWBM的物相组成、微观样貌及元素分布、力学性能等,揭示不同种类和不同掺量固废对充填体微观结构和宏观力学发展的影响。研究表明:MMS、CGS、FDG质量分数分别为20%、40%、5%时,试件抗压强度最高,养护3 d、28 d、56 d强度分别为0.26 MPa、9.55 MPa和12.16 MPa;CGS和MMS掺入,会使体系中水化产物明显增加,大孔向小孔转变且最可几孔径逐渐变小,强度呈正增长趋势;FDG掺量对M-CSWBM体系力学性能呈现显著阈值效应。当FDG掺量增至7.5%时,其通过激发二次水化反应显著优化孔隙结构(最可几孔径降低48%),促使28 d抗压强度达5.65 MPa,较基准组(0.76 MPa)提升641%;而掺量超过临界阈值(7.5%)后,未反应的FDG颗粒导致孔隙粗化(最可几孔径回升21%),致使10%掺量试件强度衰减至5.09 MPa,较最优掺量组下降10%。基于上述结果,通过建立水化产物、孔隙结构与抗压强度之间的相关性,揭示了固废掺量通过影响水化产物、孔隙结构,进而对抗压强度发展规律产生影响。研究成果为大宗全固废充填材料的利用提供数据支撑和理论参考。 展开更多
关键词 改性镁渣 煤气化渣 胶凝材料 全固废 充填材料
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葡萄糖酸钠对镁渣碳化行为的影响机理 认领 引用
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作者 刘松辉 王恒 +2 位作者 管学茂 刘小星 李根深 《建筑材料学报》 EI CAS CSCD 北大核心 2026年第3期333-339,355,共7页
通过开展温度变化、pH值演变、CO2吸收量及抗压强度测试,并结合X射线衍射(XRD)、热重分析(TG-DTG)、傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)和低场核磁共振(LF-NMR)等分析手段,系统探究了葡萄糖酸钠(SG)掺量对镁渣(MS)碳化过程的... 通过开展温度变化、pH值演变、CO2吸收量及抗压强度测试,并结合X射线衍射(XRD)、热重分析(TG-DTG)、傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)和低场核磁共振(LF-NMR)等分析手段,系统探究了葡萄糖酸钠(SG)掺量对镁渣(MS)碳化过程的作用机理。结果表明:适量SG可促进MS中钙、镁离子的溶出,进而促进碳化反应进行。MS抗压强度的提升得益于SG对于碳化产物晶体形貌的改善以及孔隙率的降低。当SG掺量为1%时,MS碳化24 h后的抗压强度较空白组提升47.1 MPa,孔隙率降至6.47%;当SG掺量增至3%和5%时,MS碳化产物减少,孔隙率增大,抗压强度显著下降。 展开更多
关键词 碳化 镁渣 葡萄糖酸钠 微观结构 硬化性能
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镁渣余热回收罐床层内气固换热过程数值模拟 认领 引用
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作者 张小艳 杨航 +2 位作者 韩子怡 王璇 孙静怡 《西安科技大学学报》 CAS 北大核心 2026年第1期58-70,共13页
为探究镁渣余热回收罐的热回收效率,基于多孔介质局部非平衡双能量方程,构建床层内气固换热模型,采用有限差分法对气固换热过程进行数值模拟。建立多孔介质区域的气相-固相双温度场耦合模型,分析冷却段高度、气体流量、固体移动速度、... 为探究镁渣余热回收罐的热回收效率,基于多孔介质局部非平衡双能量方程,构建床层内气固换热模型,采用有限差分法对气固换热过程进行数值模拟。建立多孔介质区域的气相-固相双温度场耦合模型,分析冷却段高度、气体流量、固体移动速度、气体入口温度、固体入口温度以及孔隙率对换热效果的影响。结果表明:当冷却段高度增大时,气固换热的[火用]损失逐渐降低,[火用]效率则逐步提升;气体和固体入口温度升高时,气体与固体的出口温度、气体出口热量及气固换热的损失均有所增加,但其[火用]效率基本保持不变,约为24%;随着气体流量的减少和固体移动速度的增加,气体、固体的出口温度及气固换热的[火用]损失均上升,而[火用]效率则有所下降;随着床层孔隙率的增加,[火用]损失和[火用]效率均显著降低,当孔隙率从0.31增至0.525时,气固换热的[火用]损失从112 kJ/kg降至37 kJ/kg,[火用]效率从24%降至7%。研究结果可为优化镁渣余热回收罐内的气固换热工艺参数提供一定的参考。 展开更多
关键词 余热回收 数值模拟 气固换热 镁渣 热量[火用]
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铬渣中镁的提取研究 认领 引用
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作者 闫春宇 曾一钧 +2 位作者 邱子容 全学军 李纲 《无机盐工业》 CAS CSCD 北大核心 2026年第2期76-82,共7页
铬渣是铬铁矿制备铬盐产生的固体废弃物,对铬渣深度提取铬、铝后得到低铬渣,低铬渣中主要含铁、镁等有价金属元素,具有显著的回收价值。针对低铬渣资源化利用难题,提出硫酸铵焙烧-酸浸工艺。实验以硫酸铵为焙烧剂,基于硫酸镁与硫酸铁在... 铬渣是铬铁矿制备铬盐产生的固体废弃物,对铬渣深度提取铬、铝后得到低铬渣,低铬渣中主要含铁、镁等有价金属元素,具有显著的回收价值。针对低铬渣资源化利用难题,提出硫酸铵焙烧-酸浸工艺。实验以硫酸铵为焙烧剂,基于硫酸镁与硫酸铁在高温下热分解特性差异,通过精准控制焙烧温度实现镁的高效选择性浸出,同时促进铁的稳定化富集。实验结果表明:在焙烧温度为700℃、焙烧时间为40 min、硫酸铵用量为1.5倍理论量、酸浸时间为30 min、搅拌转速为500 r/min条件下镁提取率达到99.38%;同时提镁残渣中氧化铁质量分数达到90%以上,为铁的高值化利用提供基础。该工艺实现低铬渣中镁与铁的高效分离,为铬渣中多金属元素的综合利用提供技术支持,对促进循环经济发展和减少环境污染具有重要意义。 展开更多
关键词 铬渣 镁提取 硫酸铵焙烧 酸浸
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铝灰渣烧结制备镁铝尖晶石材料过程中杂质对材料体积密度的影响研究 认领 引用
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作者 张勇 曾思琪 +2 位作者 邓雅坤 韦江 王日昕 《中国有色冶金》 CAS 北大核心 2026年第3期135-143,共9页
铝灰渣是电解铝及再生铝生产流程中产生的典型工业固体废物。本研究通过调控铝灰渣的物相组成,采用固相烧结法制备镁铝尖晶石(MA)材料,并系统探究了铝灰渣中典型杂质对烧结体体积密度的影响规律。结果表明,SiO2,CaO,Fe2O3和TiO... 铝灰渣是电解铝及再生铝生产流程中产生的典型工业固体废物。本研究通过调控铝灰渣的物相组成,采用固相烧结法制备镁铝尖晶石(MA)材料,并系统探究了铝灰渣中典型杂质对烧结体体积密度的影响规律。结果表明,SiO2,CaO,Fe2O3和TiO2这4种杂质均可提升铝灰渣基MA烧结材料的体积密度。在1400℃烧结温度下保温3 h的工艺条件下,当铝灰渣中分别引入5%SiO2、5%CaO、4.5%Fe2O3和6%TiO2烧结制备MA材料,材料体积密度由2.02 g·cm-3分别变化为2.03、2.05、2.21和2.04 g·cm-3。其中,Fe2O3对材料的致密化促进作用优于TiO2与CaO,而SiO2的致密化效果较弱。不同杂质提升MA材料体积密度的作用机制存在差异:SiO2与CaO在烧结过程中可形成低熔点液相,通过液相烧结效应强化传质过程,进而促进材料致密化;Fe2O3则会与体系中的组分发生反应,生成与MA相共晶的(Mg,Fe)2SiO4相,促使材料微观结构形成多闭孔特征,从而提升体积密度;TiO2在烧结过程中会生成MgxAlyTizO(2x+3y+4z/2)小颗粒相,该相可富集于MA大颗粒的晶界处,发挥晶界粘结作用,实现材料致密化。此外,烧结过程中杂质离子的扩散行为,也是导致MA材料体积密度发生变化的重要原因。 展开更多
关键词 铝灰渣 烧结 镁铝尖晶石 杂质 体积密度 物相转变 影响机理
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镁渣提钙制备晶型可控的碳酸钙及应用 认领 引用 被引量：1
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作者 李威 唐家傲 +2 位作者 贾松岩 郑强 李雪 《化学工程师》 CAS 2026年第1期86-91,共6页
以乙酸铵为提钙剂,研究了“皮江法”炼镁还原渣(简称镁渣)中钙组分的有效提取。浸出的含钙溶液可用于封存CO2制备CaCO3,且可通过调变反应条件控制其晶型。结果表明,乙酸铵是一种从镁渣中提取钙的优良试剂。在反应温度为45℃、乙... 以乙酸铵为提钙剂,研究了“皮江法”炼镁还原渣(简称镁渣)中钙组分的有效提取。浸出的含钙溶液可用于封存CO2制备CaCO3,且可通过调变反应条件控制其晶型。结果表明,乙酸铵是一种从镁渣中提取钙的优良试剂。在反应温度为45℃、乙酸铵溶液浓度为120g·L-1、液固比为40:1(mL∶g)、反应时间为20min的条件下,镁渣的提钙率为80.9%。在反应温度为5℃、CO2通气速率为150mL·min-1、碳钙比为2∶1、搅拌速率为300r·min-1、陈化时间为60min的条件下,Ca2+转化率为40.02%,所得CaCO3的纯度为96.1%,晶型主要为球霰石,比表面积最大可达20.95m2·g-1,可用于模拟污水中亚甲基蓝的有效脱除。 展开更多
关键词 镁渣 乙酸铵 碳酸钙 吸附 晶型可控
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Leaching of magnesium from desiliconization slag of nickel laterite ores by carbonation process 认领 引用 被引量：7
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作者 牟文宁 翟玉春 刘岩 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第S1期87-91,共5页
The leaching of magnesium from desiliconization slag of nickel laterite ores by carbonation process was studied.The influence of various parameters was investigated to optimize the conditions and determine the kinetic... The leaching of magnesium from desiliconization slag of nickel laterite ores by carbonation process was studied.The influence of various parameters was investigated to optimize the conditions and determine the kinetics of the reaction.The results show that with increasing stirring speed,liquid-to-solid ratio and reaction time,and decreasing temperature,the leaching rate of magnesium enhances.The leaching process of the desiliconization slag in the range of 288-298 K is controlled by the surface chemical reaction model.The apparent activation energy is-20.45 kJ/mol,and the kinetics model is obtained. 展开更多
关键词 desiliconization slag nickel laterite ores magnesium carbonatation leaching kinetics
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碳化养护条件对丙烯酰胺改性镁渣性能的影响 认领 引用
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作者 历静娴 张猗峥 +2 位作者 管学茂 刘松辉 李根深 《功能材料》 CAS CSCD 北大核心 2026年第5期1-8,共8页
为解决镁渣碳化韧性不高、易脆裂的问题,研究引入丙烯酰胺(AM)作为添加剂,系统考察了成型压力、液固比和碳化时间等因素对镁渣性能的影响,并通过XRD、FT-IR、SEM-EDS、LF-NMR和交流阻抗等方法对碳化过程中材料的结构演变进行表征与分析... 为解决镁渣碳化韧性不高、易脆裂的问题,研究引入丙烯酰胺(AM)作为添加剂,系统考察了成型压力、液固比和碳化时间等因素对镁渣性能的影响,并通过XRD、FT-IR、SEM-EDS、LF-NMR和交流阻抗等方法对碳化过程中材料的结构演变进行表征与分析。结果表明,随着成型压力和碳化时间的增加,镁渣的抗折和抗压强度显著提高,孔隙率逐步降低,而液固比的优化对碳化反应的充分性和强度发展同样具有关键作用。在丙烯酰胺掺量为5%(质量分数),成型压力4 MPa、液固比0.15、碳化时间24 h的条件下,镁渣抗折强度达到26.84 MPa,抗压强度达到76.21 MPa,CO2吸收量为20.16%,总孔隙率降至7.23%,综合性能最佳。研究表明,丙烯酰胺的引入有效改善了碳化镁渣的致密性和韧性,实现了强度提升与固碳效率的协同优化。该成果为高性能固碳建材的开发与应用提供了新的技术路径和理论支撑。 展开更多
关键词 镁渣 丙烯酰胺 碳化条件 硬化性能 微观结构
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蒸压处理对镁渣轻质砌块组成及性能的影响 认领 引用
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作者 李晓峰 朱永鹏 刘金辉 《有色金属（冶炼部分）》 CAS 北大核心 2026年第5期1068-1080,共13页
镁渣是镁冶炼过程产生的一种工业固体废物,当前主要以堆存方式处置,存在环境和健康风险。本研究旨在将其作为原料,制备高强度轻质泡沫砌块,以实现资源化利用。首先对镁渣进行预蒸压处理,以解决其体积安定性隐患;随后将处理后的镁渣与添... 镁渣是镁冶炼过程产生的一种工业固体废物,当前主要以堆存方式处置,存在环境和健康风险。本研究旨在将其作为原料,制备高强度轻质泡沫砌块,以实现资源化利用。首先对镁渣进行预蒸压处理,以解决其体积安定性隐患;随后将处理后的镁渣与添加剂混合制成浆料,并与发泡剂产生的泡沫混合,浇筑为泡沫砌块。然后对砌块进行CO2碳化养护,碳化养护后对砌块进行不同温度下的蒸压养护。重点探讨了蒸压温度对砌块物相组成与微观结构的调控作用,及其对抗压强度的影响。结果表明,蒸压处理可促进砌块内部C-S-H凝胶的生成,填充砌块内部孔洞;在160℃下蒸压10 h后,干密度为950~1050 kg/m3的砌块可获得11.3 MPa的抗压强度,较未经蒸压处理的砌块提升48.68%,远超国标要求。 展开更多
关键词 镁渣 泡沫砌块 碳化 蒸压 孔径分布
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一种镁渣基新型高强复合建筑胶凝材料的研究 认领 引用
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作者 田琦铭 谢婧宁 +5 位作者 谢金凤 成刚 李敏 成静 曾莹莹 邓跃全 《非金属矿》 2026年第2期36-42,共7页
为实现镁渣与垃圾焚烧飞灰解毒渣的高值化利用,研究制备了一种镁渣/解毒渣/水泥复合胶凝材料,探讨了镁渣/解毒渣/水泥三者的配比及胶凝材料-河沙配比对抗压抗折性能与耐水性的影响。结果表明,固定水泥掺量为15%时,调整镁渣与解毒渣比例... 为实现镁渣与垃圾焚烧飞灰解毒渣的高值化利用,研究制备了一种镁渣/解毒渣/水泥复合胶凝材料,探讨了镁渣/解毒渣/水泥三者的配比及胶凝材料-河沙配比对抗压抗折性能与耐水性的影响。结果表明,固定水泥掺量为15%时,调整镁渣与解毒渣比例可显著提升抗压强度(均大于50 MPa),其中1∶2配比下抗压强度最高(91.66 MPa),2∶1配比耐水性最佳(软化系数0.966)。胶凝材料与河沙配比为42.5%时综合强度最优,其中镁渣、解毒渣质量比为1∶3时抗压强度达101.515 MPa,质量比为5∶1时抗折强度为4.937 MPa。该材料环境安全性良好,可应用于高强预制构件及加固工程等场景。微观分析表明,镁渣提供的Ca2+、解毒渣提供的SO42-,与水泥协同促进钙矾石(AFt)骨架的快速形成与水化硅酸钙(C-S-H)凝胶生长,实现结构从疏松向致密演变。本研究为镁渣与飞灰解毒渣的高效利用提供了新方案,开拓了全固废基胶凝材料设计新思路,助力建筑材料绿色高值化发展。 展开更多
关键词 镁渣 垃圾焚烧飞灰解毒渣 水泥 胶凝材料
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