检索结果-南通市图书馆

Process and property optimization of ceramsite preparation by Bayan Obo tailings and blast furnace slag

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2023年第7期30卷 1381-1389页

作者： Yi-fan Chai Wen-xian Hu Yun-hao Zhang Yi-ci Wang Jun Peng Sheng-li An School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices Baotou 014010Inner MongoliaChina

The ceramsite was prepared by using Bayan Obo tailings and blast furnace slag of Baotou Steel as the main raw materials and coal gangue as pore-forming agent,and the process system and the performance of ceramsite were optimized.The phase transformation rules of the ceramsite prepared by multi-source solid waste in sintering method were clarified.The influence of sintering process parameters on ceramsite performance and the purification effect of ceramsite on ammonia nitrogen wastewater were revealed.The results show that the reasonable proportion of raw materials for preparing ceramsite is 60%tailings,35%blast furnace slag and 5%coal gangue.The reasonable preparation process of ceramsite is preheating at 350℃ for 12 min,increasing the temperature to 750℃ and holding for 60 min,then increasing the temperature to 1130℃ and roasting for 20 min.The cooling method is to cool down with the furnace.The prepared ceramsite has compressive strength of 1.89 MPa,porosity of 51.31%,water absorption of 31.42%,and bulk density of 1.94 g/cm^(3).When the ceramsite is used to treat ammonia nitrogen wastewater,the removal rate of ammonia nitrogen is 47.33%.

关键词： Bayan Obo tailing blast furnace slag Ceramsite Solid waste Comprehensive utilization

Synthesis,Characterization of NaA Zeolite from blast furnace slag(BFS)via Alkaline Fusion and Hydrothermal Treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2023年第2期38卷 401-407页

作者： LI Changxin LI Xiaoya LI Chaoyang LI Li College of Chemical Engineering and Pharmacy Jingchu University of TechnologyJingmen448000China College of Safety Science and Engineering Nanjing Tech UniversityNanjing211816China

A blast furnace slag zeolite(BFSZ)material was successfully synthesized from BFS by alkaline fusion and hydrothermal treatment.Via the analyses of XRD,FT-IR,FE-SEM,XRF,CEC and BET surface area measurement,when zeolite was synthesized at a crystallization temperature of 100℃with initial Si/Al ratio of 1:1,the main composition in the product is Na-A zeolite.Under the above conditions,the BFSZ was synthesized with CEC of 3.06 meq/g and maximum BET surface area of 37.55 m^(2)·g^(-1).Moreover,the incorporating of BFS-derived minor metals(such as Mg,Fe,and Ca)are found to be of little importance for the synthesis of BFSZ.Thus the obtained BFSZ material has a great adsorption performance for removing Mn^(2+),Cu^(2+),and NH_(4)^(+)ions diluted in water,owing to the higher CEC.

关键词： blast furnace slag conversion zeolite characterization adsorption

Efficient Use of Steel slag in Alkali-Activated blast furnace slag Based Geopolymer

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第7期11卷 3129-3141页

作者： Yu Bai Lei Wang Ying Fang College of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China

Energy shortage and the emission of greenhouse gases have become a global problem of urgent concern.Therefore,there is an urgent need to develop a low carbon building material.Geopolymers have become a hot topic due to their environmental sustainability and the feasibility of immobilizing industrial waste.In this paper,steel slag(SS)fines were investigated as auxiliary materials of blast furnace slag(BFS)based geopolymer.The hydration heat properties,flowability,compressive strength,sorptivity coefficient,X-ray diffraction(XRD),and scanning electron microscopy(SEM)of the geopolymer pastes were determined.The results showed that the incorporation of SS weakened the reactivity of the BFS-based geopolymer paste and improved the flow values of the paste.The compressive strength of the geopolymer with 20%SS content reached 117 MPa at 28 d.The geopolymer specimens with high compressive strength showed a low sorptivity coefficient.The microscopic results showed that the addition of the appropriate amount of SS reduced the cracks,improved the density of the geopolymer,and produced a geopolymer composite with excellent mechanical properties.

关键词： blast furnace slag steel slag geopolymer alkali-activated

Indirect mineral carbonation of blast furnace slag with(NH4)2SO4 as a recyclable extractant

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2017年第5期26卷 927-935页

作者： Jinpeng Hu Weizao Liu Lin Wang Qiang Liu Fang Chen Hairong Yue Bin Liang Li Lü Ye Wang Guoquan Zhang Chun Li College of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina

Large quantities of COand blast furnace slag are discharged in the iron and steel industry. Mineral carbonation of blast furnace slag can offer substantial COemission reduction and comprehensive utilisation of the solid waste. In this study, a recyclable extractant,（NH）SO, was used to extract calcium and magnesium from blast furnace slag（main phases of gehlenite and akermanite） by using low-temperature roasting to fix COthrough aqueous carbonation. The process parameters and efficiency of the roasting extraction, mineralisation, and Al recovery were investigated in detail. The results showed that the extractions of Ca, Mg, and Al can reach almost 100% at an（NH4）SO-to-slag mass ratio of 3:1 and at 370°C in 1 h. Adjusting the p H value of the leaching solution of the roasted slag to 5.5 with the NHreleased during the roasting resulted in 99% Al precipitation, while co-precipitation of Mg was lower than 2%. The Mg-rich leachate after the depletion of Al and the leaching residue（main phases of CaSOand SiO） were carbonated using（NH）COand NHHCOsolutions, respectively, under mild conditions. Approximately 99% of Ca and 89% of Mg in the blast furnace slag were converted into CaCOand（NH）Mg（CO）·4 HO,respectively. The latter can be selectively decomposed to magnesium carbonate at 100-200 °C to recover the NHfor reuse. In the present route, the total COsequestration capacity per tonne of blast furnace slag reached up to 316 kg, and 313 kg of Al-rich precipitate, 1000 kg of carbonated product containing CaCOand SiO, and 304 kg of carbonated product containing calcium carbonate and magnesium carbonate were recovered simultaneously. These products can be used, respectively, as raw materials for the production of electrolytic aluminium, cement, and light magnesium carbonate to replace natural resources.

关键词： blast furnace slag CO2 Mineral carbonation CO2 sequestration

Influence of CeO_2 addition on the preparation of foamed glass-ceramics from high-titanium blast furnace slag

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 689-695页

作者： Hong-ling Zhou Ke-qin Feng Chang-hong Chen Zi-di Yan School of Manufacturing Science and Engineering Sichuan University

Foamed glass-ceramics doped with cerium oxide（CeO_2）were successfully prepared from high-titanium blast furnace slag by one-step sintering.The influence of CeO_2 addition（1.5wt%–3.5wt%）on the crystalline phases,microstructure,and properties of foamed glass-ceramics was studied.Results show that CeO_2 improves the stability of the glass phase and changes the two-dimensional crystallization mechanism into three-dimensional one.XRD analysis indicates the presence of Ca（Mg,Fe）Si_2O_6 and Ca（Ti,Mg,Al）（Si,Al）_2O_（6 ）in all sintered samples.Added with CeO_2,Ti CeO_4 precipitates,and crystallinity increases,leading to increased thickness of pore walls and uniform pores.The comprehensive properties of foamed glass-ceramics are better than that of samples without CeO_2.In particular,the sample added with a suitable amount of CeO_2（2.5wt%）exhibits bulk density that is similar to and compressive strength（14.9 MPa）that is more than twice of foamed glass-ceramics without CeO_2.

关键词： foamed glass-ceramics cerium oxide blast furnace slag sintering crystallization

Influence of aluminium nitride as a foaming agent on the preparation of foam glass-ceramics from high-titanium blast furnace slag

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 595-600页

作者： Huan Shi Ke-qin Feng Hai-bo Wang Chang-hong Chen Hong-ling Zhou School of Manufacturing Science and Engineering Sichuan University Chengdu 610065 China School of Materials Engineering Panzhihua College Panzhihua 617000 China

To effectively reuse high-titanium blast furnace slag （TS）, foam glass-ceramics were successfully prepared by powder sintering at 1000℃. TS and waste glass were used as the main raw materials, aluminium nitride （AIN） as the foaming agent, and borax as the fluxing agent. The influence of the amount of A1N added （lwt%-5wt%） on the crystalline phases, microstructure, and properties of the produced foam glass-ceramics was studied. The results showed that the main crystal phases were perovskite, diopside, and augite. With increasing A1N content, a transformation from diopside to augite occurred and the crystallinity of the pyroxene phases slightly decreased. Initially, the aver- age pore size and porosity of the foam glass-ceramics increased and subsequently decreased; similarly, their bulk density and compressive strength decreased and subsequently increased. The optimal properties were obtained when the foam glass-ceramics were prepared by adding 4wt% AIN.

关键词： blast furnace slag aluminium nitride powder sintering foam glass-ceramics crystallization

Effect of w(MgO)/w(Al_(2)O_(3)) ratio and basicity on microstructure and metallurgical properties of blast furnace slag

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2021年第10期28卷 1223-1232页

作者： Wei-guo Kong Ji-hui Liu Yao-wei Yu Xin-mei Hou Zhi-jun He School of Materials and Metallurgy University of Science and Technology LiaoningAnshan114051LiaoningChina State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai200444China

The CaO–SiO_(2)–Al_(2)O_(3)–MgO system is the main component unit in the slag formation process in blast furnace smelting.Its structural changes directly affect the high-temperature metallurgical properties of slag.Molecular dynamics simulations were thus conducted to analyze the microstructure changes of the quaternary slag system under different basicities and w(MgO)/w(Al_(2)O_(3))ratios.The changes in w(MgO)/w(Al_(2)O_(3))ratio and basicity could affect the stability of each ion-oxygen.Increasing the basicity and w(MgO)/w(Al_(2)O_(3))ratio,the average coordination number of O surrounding Si atom only changed a little and remained approximately 4,indicating that Si exists as a stable structure of the[SiO4]4−tetrahedron in the slag structure,while the average coordination number of O surrounding Al atom changed greatly from 4 to 6,which indicated that the Al existence form could be transformed from[AlO_(4)]^(5−) tetrahedron to[AlO_(5)]^(7−) pentahedron and[AlO_(6)]^(9−) octahedron.Also,the diffusion rate of ions was accelerated with the increase in w(MgO)/w(Al_(2)O_(3))ratio and basicity.Moreover,the self-diffusion coefficients of each ion were obtained,and the magnitudes were observed to be in the following order:Mg^(2+)>Ca^(2+)>Al^(3+)>Si^(4+).The calculation and analysis of the slag viscosity and activation energy of viscous flow under different basicities and w(MgO)/w(Al_(2)O_(3))ratios revealed that the metallurgical properties of slag at high temperature depend on the flow-unit diffusivity and the microstructure stability,simultaneously,the basicity should be controlled between 1.0 and 1.2,and the w(MgO)/w(Al_(2)O_(3))ratio could be controlled between 0.45 and 0.55.

关键词： blast furnace slag Microstructure Basicity w(MgO)/w(Al_(2)O_(3))ratio Molecular dynamics

Nondestructive Microstructure Analysis of the Carbonation Evolution Process in Hardened Binder Paste Containing blast-furnace slag by X-ray CT

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2013年第5期28卷 955-962页

作者：韩建德孙伟 PAN Ganghua College of Civil Engineering Nanjing University of Technology School of Materials Science and Engineering Southeast University Jiangsu Key Laboratory of Construction Material

We used micro-XCT（X-ray computed tomography） to in-situ investigate the microstructure evolution of hardened binder paste containing different contents （0%, 30%, 50% and 70%） of blast-furnace slag at different carbonation time （O, 3, 7 and 14 days）, respectively. The carbonation front shape, the degrees of carbonation and cracks spatial distribution were studied for hardened binder paste containing BFS. In addition, the porosity and pore volume distribution of macro-pore were measured at different carbonation ages. The results reveal that the degree of carbonation at different times can be measured by the volume fraction of the uncarbonated and carbonated parts.

关键词： XCT hardened binder paste blast furnace slag carbonation gray values pore structure

A Blended Cement Containing blast furnace slag and Phosphorous slag

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2002年第2期17卷 62-65页

作者：李东旭 College of Materials Nanjing University of Technology Nanjing China

Blended cement containing blast furnace slag (BFS) and phosphorous slag( PS) is a new kind of cement. The total content of blended materials could increase if two additives were used. Using the same admixtures , the properties of the blended cement with 70% additives could reach the standard of 525-grade slag cement according to GB. The strength of cement with 80% additives could reach the standard of 425-grade slag cement. The tests of strength, pore structure, hydration products, inhibiting alkali-aggregate reaction, resistance to sulfate corrosion of BFS-PSC were performed.

关键词： blended cement blast furnace slag phosphorous slag admixtures alkali-aggregate reaction sulfate corrosion