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Study of the reinforced mechanism of fly ash on amphiphilic polymer gel

Petroleum Science 2022年第5期19卷 2175-2184页

作者： Bo-Bo Zhou Wan-Li Kang Hong-Bin Yang Zhe Li Li-Ping Ma Shi-Tou Wang Jia-Qi Wang An-Qing Xie Bauyrzhan Sarsenbekuly Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China Oil and Gas Technology Research Institute Changqing Oilfield Branch CompanyPetroChinaXi'an710018ShaanxiPR China Kazakh-British Technical University Almaty050000Kazakhstan

Amphiphilic polymer gels are widely used in heterogeneous reservoirs for conformance control ***,in high temperature and high salinity of calcium and magnesium reservoirs,amphiphilic polymer gels cannot maintain effective *** this work,a novel reinforced amphiphilic polymer gel(F-PADC gel)was prepared by physically mixing polymer solution and fly ash(FA),which is an extremely low cost *** viscoelasticity and stability of the F-PADC gel were studied by rheometry and *** reinforced mechanism of FA on amphiphilic polymer gels was *** results show that the addition of FA can make the gel more robust with a denser network *** the fifth day,the elastic modulus(G’)increases from 5.2 to 7.0 Pa and the viscosity modulus(G")increases from 0.4 to 0.6 Pa at the frequency of 1 Hz,which improves the viscoelasticity of the gel *** importantly,the F-PADC gel does not degrade after aging at 85℃for 180 *** its viscoelasticity increases obviously,G′and G"increase to 110.0 Pa and 3.5 Pa,respectively,showing excellent anti-aging ***,FA amphiphilic polymer gels have a good injectivity and a perfect plugging rate of 98.86%,which is better than that of sole amphiphilic polymer *** novel mixed FA amphiphilic polymer gels can prove to be a better alternative to conventional polymer gels to enhance oil recovery in high temperature and high salinity reservoirs.

关键词： Reinforced amphiphilic polymer gel fly ash Anti-aging stability Conformance control

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Effects of water content, water type and temperature on the rheological behaviour of slag-cement and fly ash-cement paste backfill

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International Journal of Mining Science and Technology 2020年第3期30卷 271-278页

作者： Yue Zhao Abbas Taheri Murat Karakus Zhongwei Chen An Deng School of Civil Environmental and Mining EngineeringThe University of AdelaideAdelaide 5005Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbane 4072Australia

The pumping ability and placement performance of fresh cemented paste backfill(CPB) in underground mined cavities depend on its rheological properties. Hence, it is crucial to understand the rheology of fresh CPB slurry, which is related to CPB mixture design and the temperature underground. This paper presented an experimental study investigating the effects of binder type, content, water chemical properties and content, and temperature, on the rheological properties of CPB material prepared using the tailings of a copper mine in South Australia. Portland cement(PC), a newly released commercially manufactured cement called Minecem(MC) and fly ash(FA) were used as the binders added to the mine tailing materials. Various amounts of two different water types were added to the mixtures in the preparation of backfill material slurry. Six different temperatures ranging from 5 to 60 °C were to investigate the effect of temperature on CPB rheology. Overall, the increasing water content and decreasing temperature lead to lower yield stress. Based on the results obtained from the rheological properties of CPB slurry, it was found that at room temperature(25 °C), with regards to the unconfined compressive strength(UCS) performance, the replacement of 4% PC mixed CPB(28 days UCS 425 k Pa) to 3% MC mixed CPB(28 days UCS 519 k Pa), reduced the slurry yield stress from 210.7 to 178.5 Pa. The results also showed that the chemical composition of water affects the yield stress of CPB slurry and that MC mitigates the negative effect of mine-processed water(MW) and thus lead to improve the rheological properties of the slurry. However, the results suggested that the rheological properties of a mixture using MC is very sensitive to the water volume and temperature change. Therefore, using MC in backfill requires better quality control in slump mixing.

关键词： Cemented paste backfill Minecem Rheology Yield stress fly ash Portland cement

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Preparation of fly ash and rice husk ash geopolymer

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 720-726页

作者： S. Detphan P. Chindaprasirt Department of Civil Engineering Khon Kaen University

The geopolymer of fly ash （FA） and rice husk ash （RHA） was prepared. The burning temperature of rice husk, the RHA fineness and the ratio of FA to RHA were studied. The density and strength of the geopolymer mortars with RHA/FA mass ratios of 0/100, 20/80, 40/60, and 60/40 were tested. The geopolymers were activated with sodium hydroxide （NaOH）, sodium silicate, and heat. It is revealed that the optimum burning temperature of RHA for making FA-RHA geopolymer is 690oC. The as-received FA and the ground RHA with 1%-5% retained on No.325 sieve are suitable source materials for making geopolymer, and the obtained compressive strengths are between 12.5-56.0 MPa and are dependent on the ratio of FA/RHA, the RHA fineness, and the ratio of sodium silicate to NaOH. Relatively high strength FA-RHA geopolymer mortars are obtained using a sodium silicate/NaOH mass ratio of 4.0, delay time before subjecting the samples to heat for 1 h, and heat curing at 60oC for 48 h.

关键词： geopolymer fly ash rice husk ash sodium hydroxide sodium silicate

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Humidity-control assists high-efficient coal fly ash removal by PTFE membrane

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Chinese Journal of Chemical Engineering 2021年第12期34卷 88-95页

作者： Dongyan Li Xi Tang Shasha Feng Chemical Engineering Department Nanjing Polytechnic InstituteNanjing 210048China State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneNanjing Tech UniversityNanjing 210009China

In the present study,the effects of relative humidity on filtrating coal-fired fly ash with hydrophobic poly tetra fluoroethylene(PTFE) membranes were *** intergranular force of particulate matter at different RH conditions was measured by analyzing the critical angle between *** of humidity(from 30% to 70%) on filtration pressure drop and membrane fouling conditions were *** was found the membrane showed optimal filtration resistance of 530 Pa at RH of 60% and the gas permeance can be maintained at 1440 m^(3)·m^(-2)·h^(-1)·kPa^(-1).Moreover,to optimize the operation parameters for this filtration system,effects of fly ash concentration,diameter,membrane pore size,and gas velocities were systematically investigated.

关键词： Relative humidity Collapse angle Pressure drop Poly tetra fluoroethylene(PTFE)membrane fly ash

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Novel process for facile preparation of mesoporous silica-based materials with controllable pore structure from coal fly ash Author links open overlay panel

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Particuology 2024年第8期91卷 128-137页

作者： Jian-ming Gao Zhen Li Shujia Ma Yuanyuan Zhang Fangqin Cheng Institute of Resources and Environment Engineering State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste ResourcesShanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related WastesShanxi UniversityTaiyuan 030006China

Extraction of silica from fly ash to produce mesoporous silica materials is one of the most important utilization *** silica could not be synthesized on a large-scale by conventional sol-gel *** this paper,facile preparation of mesoporous silica with controllable pore structure from fly ash by the template-free process via two steps of mineral phase transformation and selective acid etching was *** influence of crystalline structure and acid etching degree on structure of as-synthesized mesoporous silica materials was revealed,as well as mechanism of crystalline structure transformation and pore structure *** results show that mullite and quartz could be transformed into acid-soluble kaliophilite when fly ash reacted with K_(2)CO_(3)at temperature of 800-1100℃.The hexagonal kaliophilite would be transformed into orthorhombic KAlSiO_(4)-O1 phase when the temperature is controlled at 1100℃.Mesoporous silica with specific surface area of 475.93 m^(2)/g and 642.57 m^(2)/g could be synthesized from activated fly ash with kaliophilite and KAlSiO_(4)-O1 phase crystalline *** controlling the degree of acid etching,mesoporous silica materials with different pore structures can be *** paper provides a cost-effective and large-scale process for the preparation of mesoporous silica materials with controllable pore structure from solid waste fly ash.

关键词： fly ash Mesoporous silica Crystal transformation Acid etching Controllable pore structure

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Effect of Feed Forms on the Results of Melting of fly ash by a DC Plasma Arc Furnace

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Plasma Science and Technology 2009年第5期11卷 592-597页

作者：陈明周盂月东施嘉标倪国华江贻满遇鑫遥赵鹏 Institute of Plasma Physics Chinese Academy of Sciences

fly ash from a municipal solid waste incinerator （MSWI） without preprocessing （original fly ash, OFA） was melted by a direct current （DC） plasma arc furnace to investigate how the feed forms governed the results. Dioxins in flue gas from stack and bag-filter ash （BFA） were detected. The distribution of heavy metals of Pb, Cd, As, and Cr along the flue gas process system was analyzed. Through a comparison of the results for dioxins and heavy metals in this study and previous work, carrying-over of fly ash particles with the flue gas stream can be deduced. Based on the magnetic induction equation and Navier-Stokes equations, a magnetohydrodynamic （MHD） model for the plasma arc was developed to describe the particle-carrying effect. The results indicate that, a. when melted, the feed forms of MSWI fly ash affect the results significantly; b. it is not preferable to melt MSWI fly ash directly, and efforts should be made to limit the mass transfer of OFA from the plasma furnace.

关键词： fly ash plasma melting dioxins heavy metal

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Detoxifying PCDD/Fs and heavy metals in fly ash from medical waste incinerators with a DCdouble arc plasma torch

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Journal of Environmental Sciences 2013年第7期25卷 1362-1367页

作者： Xinchao Pan Jianhua Yan Zhengmiao Xie Institute of Environmental Science &Technology Hangzhou Dianzi University Institute for Thermal Power Engineering Zhejiang University

Medical waste incinerator （MWI） fly ash is regarded as a highly toxic waste because it contains high concentrations of heavy metals anddioxins, including polychlorinateddibenzo-p-dioxins （PCDDs） and polychlorinateddibenzofurans （PCDFs）. Therefore fly ash from MWI must be appropriately treated before beingdischarged into the environment. A melting process based on adirect current thermal plasma torch has beendeveloped to convert MWI fly ash into harmless slag. The leaching characteristics of heavy metals in fly ash and vitrified slag were investigated using the toxicity characteristic leaching procedure, while the content of PCDD/Fs in the fly ashes and slags was measured using method 1613 of the US EPA. The experimental results show that thedecomposition rate of PCDD/Fs is over 99% in toxic equivalent quantity value and the leaching of heavy metals in the slag significantlydecreases after the plasma melting process. The produced slag has a compact and homogeneous microstructure withdensity of up to2.8 g/cm3 .

关键词： medical waste incinerator fly ash plasma torch PCDD/Fs heavy metal

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Liquid-solid grinding system:Grinding kinetics of coal fly ash as ultrafine supplementary cementitious materials

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Particuology 2024年第11期94卷 109-119页

作者： Jin Yang Yong Huang Xingyang He Ying Su Tao Huang Bohumír Strnadel School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China Building Waterproof Engineering and Technology Research Center of Hubei Province Hubei University of TechnologyWuhan430068China Center of Advanced Innovation Technologies VŠB-Technical University of Ostrava70833 Ostrava-PorubaCzech Republic

Wet-milling in liquid-solid system can achieve ultra-fine mechanical dissociation of solid wastes with low energy consumption,thereby efficiently improving the potential pozzolanic ***,the wet-milling kinetics of ultrafine dissociation in liquid-solid system has not been fully *** paper systematically investigates the wet-milling kinetics of fly ash(FA).Results showed that before wet-milling of FA for 360 min,no agglomeration effect was *** particle dissociation of FA during wet-milling can be divided into three stages:rapid dissociation,slow dissociation and *** evolution process of particle size distribution during wet-milling is consistent with the Rosin-Rammler-Bennet *** the particle uniformity coefficient and fractal dimension showed highly positive linear correlation with the strength activity index of wet-milled *** grey correlation analysis showed that FA particles between 1.1 and 3.1μm had the greatest impact on both the early and late strength activity ***,D10 of wet-milled FA has the largest impact on strength activity index at each age,while D100 has the least ***,D10 and proportion of particles in 1.1–3.1μm can be an important basis for judging the reactivity of wet-milled FA as ultrafine supplementary cementitious materials.

关键词： Wet-milling Liquid-solid system Grey correlational analysis fly ash Ultrafine supplementary cementitious materials

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Fabrication and properties of foam geopolymer using circulating fluidized bed combustion fly ash

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International Journal of Minerals,Metallurgy and Materials 2014年第1期21卷 89-94页

作者： Ze Liu Ning-ning Shao Dong-min Wang Jun-feng Qin Tian-yong Huang Wei Song Mu-xi Lin Jin-sha Yuan Zhen Wang School of Chemical and Environmental Engineering China University of Mining & Technology

In recent years, circulating fluidized bed combustion fly ash （CFA） is used as a raw material for geopolymer synthesis. Hydrogen peroxide was employed as a foaming agent to prepare CFA-based foam geopolymer. The particle distribution, mineral composition, and chemical composition of CFA were examined firstly. Geopolymerization products were characterized by mechanical testing, scanning elec- tron microscopy （SEM）, X-ray diffraction （XRD）, and X-ray fluorescence （XRF）. The CFA-based foam geopolymer was successfully fabri- cated with different contents of hydrogen peroxide and exhibited uncompleted alkali reaction and reasonable strength with relative low atomic ratios of Si/Al and Si/Na. Type-C CFA in this research could be recycled as an akernative source material for geopolymer production.

关键词： fly ash geopolymers foamed products microstructure hydrogen peroxide

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Influence of fly ash fineness and shape on the porosity and permeability of blended cement pastes

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International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 683-690页

作者： Theerawat Sinsiri Prinya Chindaprasirt Chai Jaturapitakkul School of Civil Engineering Suranaree University of Technology Department of Civil Engineering Khon Kaen University Department of Civil Engineering King Mongkut's University of Technology Thonburi

The effects of the fineness and shape of fly ash on the porosity and air permeability of cement pastes were investigated. Pulverized coal combustion （PCC） fly ash and fluidized bed coal combustion （FBC） fly ash classified into three different finenesses were used. River sand with particle size distribution similar to that of fly ash was also used for comparison. Portland cement was replaced with fly ash and ground sand at the dosages of 0, 20wt%, and 40wt%. A water-to-binder ratio （w/b） of 0.35 was used throughout the experiment. The results show that the porosity and air permeability of the pastes are influenced by the shape, fineness, and replacement level of fly ash. The porosity and air permeability of FBC fly ash pastes are higher than those of PCC fly ash pastes. This is due to the higher irregular shape and surface of FBC fly ash compared to the spherical shape and relatively smooth surface of PCC fly ash. The porosity increases with the increase in fly ash replacement level and decreases with the increase in its fineness. The permeability of PCC fly ash pastes decreases with the increase in replacement level and fineness, while for FBC fly ash, the permeability increases with the increase in replacement level. Decreases in porosity and permeability are due to a combined effect of the packing of fine particles and the reaction of fly ash.

关键词： cement fly ash coal combustion porosity permeability

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