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Adsorption of rare earth elements on organic matter in coal

Journal of Rare Earths 2023年第7期41卷 1108-1115,I0005页

作者： Xiaorui Wang Wei Cheng Renda Xu College of Mining Guizhou UniversityGuiyang 550025China National&Local Joint laboratory of Engineering for Effective utilization of Regional mineral resources from Karst Areas Guiyang 550025China guizhou key laboratory of comprehensive utilization of non-metallic mineral resources Guiyang 550025China

The occurrence modes of rare earth elements(lanthanide and yttrium,abbreviated as REY) in coal are impo rtant both for coal geochemistry studies and the application potential of REY as a by-product of coalbased resources.In this study,the adsorption behaviors of REY on organic matter in coal were investigated by leaching tests using REY solution and ultra-low ash coal samples.On this basis,the adsorption mechanism of REY on organic matter in coal was also studied by molecular simulation calculations.The leaching tests show that the organic matter in coal has a relatively strong adsorption capacity for REY,and that the average adsorption rate or the net adsorption amount of heavy rare earth elements(HREY:Gd,Tb,Y,Dy,Ho,Er,Tm,Yb and Lu) is always higher than that of the light rare earth elements(LREY:La,Ce,Pr,Nd,Sm and Eu).A molecular model of humic acid(HA) was constructed and the adsorption amount between REY and HA was calculated.The results show that the theoretical adsorption rate of HREY(84.88%) is higher than that of the LREY(84.00%).The analysis of the adsorption distances between REY atoms and various functional groups on HA molecules shows that the minimum adsorption distance of LREY is 0.372 nm on average,which is larger than that of HREY(0.368 nm),indicating that the adsorption capacity of the latter is stronger.In addition,a coal molecule(C_(18)H_(22)O) was also constructed to investigate the adsorption characteristics of various REY atoms on the molecule.As a result,it is found that the average binding ene rgy and bond length between the hydroxyl functional group and LREY atoms are 0.12469 Ha(Hartree,the unit of energy in the atomic unit system) and 0.1407 nm,respectively,while for HREY,0.12883 Ha and 0.1121 nm,respectively.This confirms that HREY is more stable than LREY in binding on organic matter in coal.To conclude,both leaching tests and molecular simulation calculations reveal that REY has a strong adsorption affinity for organic matter in coal,and in particular,HREY shows a stronger organic ads

关键词： Coal Rare earth elements Adsorption characteristics Leaching Molecular simulation

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Modes of occurrence and pre-concentration of rare earth elements in No.17 coal in Liupanshui coalfield,China

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Journal of Rare Earths 2022年第8期40卷 1323-1332页

作者： Bo Yang Chen Cheng Yuanxin Li Wei Cheng Jingkun Zang Xiangping Lai Xiaorui Wang College of Mining Guizhou UniversityGuiyang 550025China National&Local Joint laboratory of Engineering for Effective utilization of Regional mineral resources from Karst Areas Guiyang 550025China guizhou key laboratory of comprehensive utilization of non-metallic mineral resources Guiyang 550025China guizhou Panjiang Clean Coal Co. Ltd.Liupanshui 553000China

Rare earth elements(lanthanide and yttrium,abbreviated as REY) provide important support for national security,energy production,environmental protection and economic growth.In recent years,many studies have shown that the content of REY in some coal or coal by-products is close to or even higher than that in traditional REY ore,which makes coal a potential source of REY.This study took the No.17 coal of Panzhou mining area in Liupanshui coal field as the research object,and the content and occurrence modes of REY in raw coal and 7 density fraction samples were studied.The results show that the content of REY in the raw coal reaches 220.67 μg/g,which is significantly higher than the average REY content in the world coal and Chinese coal as reported in the literature.Gravity separation has a certain pre-enrichment effect on REY and the fraction sample> 1.8 g/cm~3 has the highest REY of 426.27 μg/g(equal to rare earth oxide 0.1%).Study on correlation between REY and ash yields reveals that the organic affinity of the light rare earth is higher than that of the medium rare earth and the heavy rare earth.As shown by X-ray diffraction(XRD) and X-ray flouresence spectroscopy(XRF),the major minerals in coal are kaolinite,quartz and calcite,and the content of REY in coal is significantly related to Al,Si and kaolinite,which implies that REY occur mainly in kaolinite.Laser ablation inductively coupled plasma mass spectroscopy(LA-ICP-MS) was adopted to determine chemical composition of micro-zone in kaolinite in coal and the results show that there is no obvious correlation between REY and the contents of Al and Si.This indicates that the REY occur probably in the form of adsorption.The research results provide a scientific reference for the potential extraction of the associated REY in the coal.

关键词： Coal Rare earth elements Occurrence mode Kaolinite Pre-concentration

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Characterization of the fracture compressibility and its permeability for shale under the effects of proppant embedment and compaction:A preliminary study

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Petroleum Science 2022年第3期19卷 1125-1138页

作者： Jian-Hua Li Bo-Bo Li Qiao-Yun Cheng Zheng Gao Guangdong Provincial key laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060GuangdongChina Shenzhen key laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen518060GuangdongChina College of Mining Guizhou UniversityGuiyang550025GuizhouChina guizhou key laboratory of comprehensive utilization of non-metallic mineral resources Guiyang550025GuizhouChina National&Local Joint laboratory of Engineering for Effective utilization of Regional mineral resources from Karst Areas Guizhou UniversityGuiyang550025GuizhouChina

Hydraulic fracturing technology plays a key role in improving the recovery rate of shale gas.The improvement of permeability in relation to hydraulic fracturing depends on changes brought about by the proppant on the fracture structure in reservoirs.Then it is of great significance to describe the microscopic changes during this process by means of an accurate theoretical model.In this study,based on the heterogeneity of shale fracture and the compaction and embedment of a proppant,we proposed a permeability model to examine the combined effects of a proppant and stress to describe the change mechanism in permeability.Further,changes in fracture width and porosity were considered,and a calculation model of fracture compressibility under proppant compaction and embedment was proposed.The difference from previous studies is that the compressibility and permeability of supported fractures can be further quantified and analyzed by this model.Moreover,its rationality was verified by publicly released test data.The results show that,the compressive effect of stress and the embedding of proppant both have a negative impact on shale permeability.

关键词： Shale Fracture compressibility Permeability Hydraulic fracturing Proppant embedment

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Adsorption of residual amine collector HAY from aqueous solution by refined carbon from coal fly ash and activated carbon

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Journal of Central South University 2017年第1期24卷 30-38页

作者：李显波叶军建邱跃琴李龙江卯松刘志红张覃 College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Mining College Guizhou UniversityGuiyang 550025China National&Local Joint laboratory of Engineering for Effective utilization of Regional mineral resources from Karst Areas Guizhou UniversityGuiyang 550025China guizhou key Lab of comprehensive utilization of non-metallic mineral resources Guizhou UniversityGuiyang 550025China

Refined carbon(RC) derived from coal fly ash(CFA) as well as powdered activated carbon(PAC) was investigated as adsorbent to remove residual amine collector HAY from aqueous solution.The RC and PAC were characterized by scanning electron microscopy(SEM),surface area measurement,Zeta potential measurement and Fourier transform infrared(FTIR) spectroscopy.The effect factors and mechanisms of HAY adsorption onto RC and PAC were studied in detail.The results show that the experimental kinetic data agree well with the pseudo second-order equation,and the Langmuir isotherm model is found to be more appropriate to explicate the experimental equilibrium isotherm results than the Freundlich model.The adsorption capacities of PAC and RC increase with pH.It is found that alkaline condition is conducive to the adsorption of HAY onto PAC and RC and the adsorption efficiency of RC is close to PAC at pH near 11.Zeta potential variation of adsorbents suggests that HAY generates electrostatic adsorption onto RC and PAC.FTIR analysis shows that the adsorption is dominantly of a physical process.The Box-Behnken design optimization conditions of process are RC 1 g/L,pH 11,temperature 302 K and initial HAY concentration 100 mg/L.Under these conditions,the measured adsorption ratio and adsorption capacity are 87.91%and 87.91 mg/g,respectively.Thus,the RC is considered to be a potential adsorbent for the removal of residual amine from aqueous solution.

关键词：粉末活性炭溶液吸附水溶液粉煤灰干草残余傅立叶变换红外光谱扫描电子显微镜

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Preliminary study on washability and composition analysis of high- sulfur coal in some mining areas in guizhou

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Journal of Coal Science & Engineering(China) 2011年第1期17卷 93-95页

作者： QIU Yue-qin MAO Song ZHANG Qin TIAN Ye LIU Zhi-hong College of Mining Guizhou University Guiyang 550003 China guizhou key laboratory of comprehensive utilization of non-metallic mineral resources Guizhou University Guiyang 550003 China guizhou Jinchi Chemical Co. Ltd. Guiyang 550000 China

Preliminary sink-float experiments on high-sulfur coal was done in some mining areas and carried on elementary analysis, industrial analysis, and ashcontent analysis. Through the experiments, definite middlings, and gangue, the phase analysis of sulfur was carried on, by which a good understanding of sulfur characters in raw coal was achieved.

关键词：高含硫矿区煤分析可选性贵州组成元素分析产业分析

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Analysis on control technology for collapsing vibration generated by building demolition blasting

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Journal of Coal Science & Engineering(China) 2010年第3期16卷 262-266页

作者： CHI En-an ZHANG Yi-ping College of Resource and Environment Wuhan University of Technology Wuhan 430070 China Mining School Guizhou University Guiyang 550003 China guizhou key laboratory of comprehensive utilization of non-metallic mineral resources Guiyang 550003 China

The mechanism of ground vibration in building demolition blasting was investigated,taking into account the prevailing influential factors, including the building's heightof mass center, the quantity size, the structural feature, the component material quantity,the demolition method, the geological structure of the region, earthquake resistance rank,as well as the earthquake wave dissemination.The proposed method was applied efficientlyto reduce the blasting effects on the environment, which enriches the control theoriesof vibration caused by collapse in the blasting process and may provide a good referencefor the related engineering practices.

关键词：建筑物拆除地面振动技术分析倒塌控制破产爆破机理影响因素

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粉煤灰微波碱熔辅助水热合成沸石及其对水溶液中Cd(Ⅱ)的强化吸附作用（英文）

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Journal of Central South University 2018年第1期25卷 9-20页

作者：李显波叶军建刘志红邱跃琴李龙江卯松王贤晨张覃 College of Materials and Metallurgy Guizhou University Guiyang 550025 China Mining College Guizhou University Guiyang 550025 China National & Local Joint laboratory of Engineering for Effective utilization of Regional mineral resources from Karst Areas Guiyang 550025 China guizhou key Lab of comprehensive utilization of non-metallic mineral resources Guiyang 550025 China

针对传统水热法合成沸石存在碱熔温度高、反应时间长的问题,提出了一种新的粉煤灰微波碱熔辅助水热合成沸石的方法,并将沸石产品用于吸附水溶液中的Cd(Ⅱ)。其合成工艺是将粉煤灰与氢氧化钠混合物置于微波箱式高温反应器中以450°C反应1... 详细信息

针对传统水热法合成沸石存在碱熔温度高、反应时间长的问题,提出了一种新的粉煤灰微波碱熔辅助水热合成沸石的方法,并将沸石产品用于吸附水溶液中的Cd(Ⅱ)。其合成工艺是将粉煤灰与氢氧化钠混合物置于微波箱式高温反应器中以450°C反应15 min,碱熔产物加水在常温下磁力搅拌4 h,再在90°C下静置12 h,过滤、洗涤、干燥得到沸石产品。采用X射线衍射分析、扫描电镜分析、红外光谱分析、比表面积分析和zeta电位分析表征吸附剂。结果表明:合成的沸石为八面沸石,含量约为93%,比表面积为75.72 m^2/g,pH_(zpc)为3.80。从水溶液中去除Cd(Ⅱ),优化的吸附剂用量为0.5 g/L,p H 6,吸附时间为90 min,初始浓度为20 mg/L。在此条件下,Cd(Ⅱ)的去除率达98.55%。Cd(Ⅱ)在沸石表面的吸附符合伪二级动力学模型,Langmuir等温吸附模型比Freundlich模型、Dubinin-Radushkevich模型和Temkin模型更适合于描述等温吸附过程,最大的Cd(Ⅱ)吸附量为86.96mg/g。热力学计算表明:Cd(Ⅱ)在合成沸石表面的吸附为自发、吸热过程。

关键词：微波粉煤灰合成沸石吸附 Cd(II)

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泡沫浮选法分离硅藻土表面偶氮二甲酰胺（英文）

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Journal of Central South University 2018年第1期25卷 29-37页

作者：张覃谢俊陈建华程伟 Mining College Guizhou University Guiyang 550025 China guizhou key Lab of comprehensive utilization of non-metallic mineral resources Guizhou UniversityGuiyang 550025 China guizhou Engineering Lab of Effective utilization of Regional mineral resources Guizhou University Guiyang 550025 China College of resources and Environment Guizhou University Guiyang 550025 China College of resources and Metallurgy Guangxi University Nanning 530004 China

硅藻土是一种具有独特微孔结构的硅质沉积岩,可用作吸附或填充材料。偶氮二甲酰胺是工业上广泛应用的一种发泡剂,将偶氮二甲酰胺填充到硅藻土孔隙中能改善硅藻土性能,使其同时具有硅藻土和偶氮二甲酰胺特性,覆盖在硅藻土表面的偶氮二甲... 详细信息

硅藻土是一种具有独特微孔结构的硅质沉积岩,可用作吸附或填充材料。偶氮二甲酰胺是工业上广泛应用的一种发泡剂,将偶氮二甲酰胺填充到硅藻土孔隙中能改善硅藻土性能,使其同时具有硅藻土和偶氮二甲酰胺特性,覆盖在硅藻土表面的偶氮二甲酰胺会影响改性材料的性能。本文通过微泡浮选对硅藻土表面分离偶氮二甲酰胺进行了研究,考察了捕收剂用量、起泡剂种类和用量、pH值对分离效果的影响,结果表明:当起泡剂MC-1用量为60 mg/L,捕收剂煤油用量为80 mg/L,p H为5时,效果最好,偶氮二甲酰胺与硅藻土的上浮率之差达到89.4%,偶氮二甲酰胺的回收率达到72.5%。通过扫描电镜和能谱对浮选产品进行表征,结果表明:与原矿相比,浮选后硅藻土表面偶氮二甲酰胺大幅度减少,硅藻土孔隙中偶氮二甲酰胺基本不变。通过红外光谱研究了药剂与矿物之间的作用机理,表明硅藻土与煤油之间不存在化学吸附,浮选体系中煤油与MC-1形成一种乳状液,吸附于硅藻土表面形成保护层,防止药剂和矿浆与硅藻土孔隙内的AC相互作用。

关键词：硅藻土偶氮二甲酰胺泡沫浮选

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Acoustic emission parameters and energy dissipation law of cyclic load and unload damage of dihydrate gypsum under different loading rate

Geohazard Mechanics

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Geohazard Mechanics 2023年第2期1卷 185-193页

作者： Yanyu Chu Gaofeng Ren Congrui Zhang Yin Zheng Dong Li School of resources and Environmental Engineering Wuhan University of TechnologyWuhanChina China Academy of Safety Science and Technology BeijingChina key laboratory of Green utilization of key non-metallic mineral resources Ministry of EducationWuhanChina key laboratory of mineral resources Processing and Environment of Hubei Province Wuhan University of TechnologyWuhanChina CNBM Research Institute for Advanced Glass Materials Group Co. LtdBengbuAnhuiChina

In order to explore the effect of loading rate on physical and mechanical properties of dihydrate gypsum,cyclic loading and unloading mechanical tests were carried out at different loading rates.Test results were analyzed from the aspects of stress-strain curve,energy distribution mode,damage law and failure mode of specimen.The main research results obtained in the thesis are as follows:with the increase of the loading rate,the peak value of specimen damage first increases rapidly,and then in-creases slowly,and there is a damage threshold.In the early stage of loading,the dissipated energy of the specimen accounts for about 70%of the total energy,most of the total energy input is converted into dissipated energy.The elastic energy density shows an increasing trend with the increase of the loading rate.The elastic energy density is the highest when the loading rate is 400 N/s,and more elastic energy can be stored.The ratio of elastic energy ue/u increases with the in-crease of loading rate and tends to be stable.The acoustic emission data show that the acoustic emission signals present a certain agglomeration phenomenon at the unloading point,and there is a“blank period”between the unloading point and the emergence of the next acoustic emission activity.In the early stage of specimen loading,friction-type acoustic emission is mainly generated.The cumulative ringing count when the load reaches the peak failure stress at low loading rate is more,indicating that low loading rate will produce more acoustic emission activities.With the increase of loading rate,the cumulative ringing number per unit time increases,indicating that the increase of loading rate accelerates the damage and failure of dihydrate gypsum near the peak value.The failure mode of gypsum specimens is shear failure,and the increase of loading rate of shear failure angle shows an increasing trend.The larger the loading rate is,the higher the strength of the specimen is.The more energy the press inputs during the loading process,the higher the energy

关键词： Gypsum Energy densities Acoustic emission Ringing counts Energy storage limitation

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Removal of hexavalent chromium in aquatic solutions by pomelo peel

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Water Science and Engineering 2020年第1期13卷 65-73页

作者： Qiong Wang Cong Zhou Yin-jie Kuang Zhao-hui Jiang Min Yang Hunan Provincial key laboratory of comprehensive utilization of Agricultural and Animal Husbandry Waste resources College of Urban and Environmental SciencesHunan University of TechnologyZhuzhou 412007China Hunan Provincial Engineering laboratory of key Technique of non-metallic Packaging Waste resources utilization Hunan University of TechnologyZhuzhou 421007China People's Government of Luohong Town Longhui CountyShaoyang 422211China School of Chemistry and Food Engineering Changsha University of Science and TechnologyChangsha 410114China

This study investigated the removal of hexavalent chromium(Cr(VI)) in aqueous solutions using pomelo peel(PP) and FeCl3-modified pomelo peel(FPP) as novel biomass adsorbents.Batch adsorption experiments were performed to evaluate the effects of pH,time,temperature,initial concentration,and adsorbent dose on Cr(VI) removal by PP and FPP.The results show that the maximum adsorption capacity of Cr(VI)was 21.55 mg/g for FPP and 0.57 mg/g for PP at a pH of 2.0 and a temperature of 40℃.The surface shape,microstructure,and chemical composition of FPP were analyzed with scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and energy dispersive spectroscopy(EDS),and compared with those of PP.The results show that the adsorption performance of FPP was much better than that of PP,indicating that FPP can be an alternative high-efficiency adsorbent for Cr(VI) removal.

关键词： Adsorption Hexavalent chromium removal Biomass adsorbent Pomelo peel FeCl3-modified pomelo peel Aquatic solution

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