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International Journal of minerals,Metallurgy and Materials 2015年第10期22卷 1005-1016页

作者： Jia-jie Li Michael Hitch Norman B.Keevil Institute of Mining Engineering University of British ColumbiaVancouver V6T 1Z4Canada

CO2sequestration by mineral carbonation can permanently store CO2and mitigate climate change. However, the cost and reaction rate of mineral carbonation must be balanced to be viable for industrial applications. In this study, it was attempted to reduce the carbonation costs by using mine waste rock as a feed stock and to enhance the reaction rate using wet mechanical activation as a pre-treatment method. Slurry rheological properties, particle size distribution, specific surface area, crystallinity, and CO2 sequestration reaction efficiency of the initial and mechanically activated mine waste rock and olivine were characterized. The results show that serpentine acts as a catalyst, increasing the slurry yield stress, assisting new surface formation, and hindering the size reduction and structure amorphization. Mechanically activated mine waste rock exhibits a higher carbonation conversion than olivine with equal specific milling energy input. The use of a high-speed stirred mill may render the mineral carbonation suitable for mining industrial practice.

关键词： mineral carbonation mine wastes mechanical activat

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

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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

A combination process of mineral carbonation with S02 disposal for simulated flue gas by magnesia-added seawater

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Frontiers of Chemical Science and Engineering 2019年第4期13卷 832-844页

作者： Yingying Zhao Mengfan Wu Zhiyong Ji Yuanyuan Wang Jiale Li Jianlu Liu Junsheng Yuan School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China Hebei Collaborative Innovation Center of Modem Marine Chemical Technology Tianjin 300130China Quanzhou Normal University Fujian 362000China Shandong Haihua Group Co. Ltd.Shandong 262737China

The desulfurization by seawater and mineral carbonation have been paid more and more attention.In this study,the feasibility of magnesia and seawater for the integrated disposal of S02 and C02 in the simulated flue gas was investigated.The process was conducted by adding MgO in seawater to reinforce the absorption of S02 and facilitate the mineralization of C02 by calcium ions.The influences of various factors,including digestion time of magnesia,reaction temperature,and salinity were also investigated.The results show that the reaction temperature can effectively improve the carbonation reaction.After combing S02 removal process with mineral carbonation,Ca^2+removal rate has a certain degree of decrease.The best carbonation condition is to use 1.5 times artificial seawater(the concentrations of reagents are 1.5 times of seawater)at 80℃and without digestion of magnesia.The desulfurization rate is close to 100%under any condition investigated,indicating that the seawater has a sufficient desulfurization capacity with adding magnesia.This work has demonstrated that a combination of the absorption of S02 with the absorption and mineralization of C02 is feasible.

关键词： mineral carbonation wet S02 disposal seawater.desulfurization

Iron and lead ion adsorption by microbial flocculants in synthetic wastewater and their related carbonate formation

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Journal of Environmental Sciences 2013年第12期25卷 2422-2428页

作者： Minjie Yao Bin Lian Hailiang Dong Jianchao Hao Congqiang Liu State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of Sciences Key Laboratory of Environmental and Applied Microbiology Chengdu Institute of BiologyChinese Academy of Sciences Jiangsu Key Laboratory for Microbes and Functional Genomics Jiangsu Engineering and Technology Research Center for MicrobiologyCollege of Life ScienceNanjing Normal University State Key Laboratory of Geobiology and Environmental Geology China University of Geosciences Department of Geology and Environmental Earth Science Miami University

Although microbial treatments of heavy metal ions in wastewater have been studied, the removal of these metals through incorporation into carbonate minerals has rarely been reported. To investigate the removal of Fe^3＋ and Pb^2＋, two representative metals in wastewater, through the precipitation of carbonate minerals by a microbial flocculant （MBF） produced by Bacillus mucilaginosus. MBF was added to synthetic wastewater containing different Fe^3＋ and Pb^2＋ concentrations, and the extent of flocculation was analyzed. CO2 was bubbled into the mixture of MBF and Fe^3＋/Pb^2＋ to initiate the reaction. The solid substrates were analyzed via X-ray diffraction, transmission electron microscopy and energy dispersive spectroscopy. The results showed that the removal efficiency decreased and the MBF adsorption capacity for metals increased with increasing heavy metal concentration. In the system containing MBF, metals （Fe^3＋ and Pb^2＋）, and CO2, the concentrated metals adsorbed onto the MBF combined with the dissolved CO2, resulting in oversaturation of metal carbonate minerals to form iron carbonate and lead carbonates. These results may be used in designing a method in which microbes can be utilized to combine CO2 with wastewater heavy metals to form carbonates, with the aim of mitigating environmental problems.

关键词： Bacillus mucilaginosus microbial flocculation wastewater treatment carbon dioxide fixation mineral carbonation

A stepwise process for carbon dioxide sequestration using magnesium silicates

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Frontiers of Chemical Science and Engineering 2010年第2期4卷 133-141页

作者： Johan FAGERLUND Experience NDUAGU Inês ROMÃO Ron ZEVENHOVEN Åbo Akademi University Thermal and Flow EngineeringBiskopsgatan 8FI-20500Åbo/TurkuFinland visiting from University of Coimbra Department of Chemical EngineeringPólo IIPinhal de Marrocos3030-290 CoimbraPortugal

This work involves the production of magnesium in the form of Mg(OH)_(2)from serpentinite rock(nickel mine tailing)material followed by conversion into MgCO_(3)using a pressurised fluidised bed(PFB)reactor operating at 400℃-600℃and pressures up to 2.85 MPa.Our approach is rooted in the thermodynamic fact that the reaction between Mg(OH)_(2)and gaseous CO_(2)forming MgCO_(3)and water releases significant amounts of heat.The main problem is,however,the chemical kinetics;the reaction is slow and has to be accelerated in order to be used in an economically viable process for large-scale(~1 Mt/a)CO_(2)sequestration.We have constructed a labscale PFB reactor test-setup for optimising the carbonation reaction.At high enough temperatures and conversion levels the reaction should provide the heat for the proceeding Mg(OH)_(2)production step,making the overall process energy neutral.So far we have been able to achieve a conversion degree of 26%at 500℃and 2.85 MPa after 30 min(particle size 125-212μm).In this paper the test facility and our latest results and progress on CO_(2)mineral carbonation are summarised.Also,the possible integration of the iron as a feedstock for iron and steel production will be briefly addressed.An interesting side-effect of this carbon dioxide capture and storage(CCS)route is that significant amounts of iron are obtained from the serpentinite rock material.This is released during the Mg(OH)_(2)production and can be of great interest to the iron-and steel producing sector,which at the same time is Finland’s largest CO_(2)producer.

关键词： mineralisation serpentinite mineral carbonation magnesium carbonate fluidised bed

Truth and False-carbon Dioxide Mitigation Technologies

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Non-Metallic Material Science 2021年第2期3卷 1-5页

作者： Muhammad Imran Rashid Department of Chemical Polymer and Composite Materials EngineeringUniversity of Engineering and TechnologyLahore(New Campus)39021Pakistan Discipline of Chemical Engineering University of NewcastleNSW 2308Australia

Research progress is required to be enhanced for those storage technologies which store CO_(2)fast and permanently.However,temporary storage technologies importance cannot be denied to immediately reduce global warming and reduce higher CO_(2)concentration in the atmosphere.Continuous CO_(2)storage facilities,semi-batch and batch pilot plants deemed necessary to build for future survival of the earth planet.Membranes can be used to separate CO_(2)from common flue gases followed by mineral carbonation to convert CO_(2)into stable carbonates.Modifications in cement industry,coal fired power plants,fertilizer industries and other chemical process industries appears essential.

关键词： Carbon dioxide storage technologies Membranes and mineral carbonation Carbon Dioxide conversion to urea Carbon dioxide conversion to chemicals and biochemicals mineral carbonation Polymeric Materials

Benefaction from carbonation of Flue Gas CO_(2) as Coal Mining Filling

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Geomaterials 2014年第2期4卷 64-72页

作者： Yildirim I.Tosun Sirnak University Engineering FacultyMining Engineering DepartmentSirnakTurkey

CO2 capturing, transport and sequestration by pressurized water dissolution and reacting by natural alkali lime and magnesia in coal fly ash or other sources become an industrial advantageous sequestration option resulting in green waste solutions or solid fines. Mg and Ca containing minerals are reacting with CO2 to form carbonates. Various types of fly ash materials may react with CO2 to form carbonate regarding ash composition and reaction parameters. mineral sequestration of CO2 will also allow using the products in cement industry or as cement material in constructions with low cost. This paper discussed progress on coal mining filling by carbonation method using coal fly ash of Soma, Yatagan, Afsin Elbistan Power Stations. Other filler materials containing coal mine waste shale, fly ashes and foam concrete, and additives were searched for pretreatment methods to enhance cement reactivity;and in analyzing the structural changes to identify reaction paths and potential barriers.

关键词： Carbon Sequestration Coal Fly Ash Utilization mineral carbonation mineralization Fly Ash