粉煤灰中莫来石及刚玉高碱溶液分解动力学（英文）
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摘要
对粉煤灰中莫来石和刚玉在高碱溶液分解动力学进行研究。考察反应温度和反应时间对莫来石和刚玉分解率及氧化铝回收效率的影响。结果表明,升高反应温度及延长反应时间有利于莫来石、刚玉分解和氧化铝回收,且莫来石的分解温度低于刚玉的分解温度。当在220°C条件下反应90 min后,1 L循环碱液可回收多于100 g氧化铝。莫来石和刚玉的分解过程符合收缩核模型,且反应速率受化学反应控制,二者的反应活化能分别为67.46和161.82 kJ/mol。
Decomposition kinetics of mullite and corundum in coal fly ash with highly alkaline solution was studied. The effects of the reaction temperature and reaction time on decomposition rates of mullite and corundum and alumina extraction efficiency were investigated. The results show that increasing reaction temperature and reaction time increases the decomposition rates of mullite and corundum and alumina extraction efficiency, with the decomposition temperature of mullite lower than that of corundum. After 90 min reaction at 220 °C, more than 100 g alumina was extracted when recycling 1 L of alkaline solution. The decomposition processes of mullite and corundum corresponded with the shrinking unreacted core model, and the reaction rate was under chemical reaction control, with the activation energies of mullite and corundum being 67.46 and 161.82 kJ/mol, respectively.
Decomposition kinetics of mullite and corundum in coal fly ash with highly alkaline solution was studied. The effects of the reaction temperature and reaction time on decomposition rates of mullite and corundum and alumina extraction efficiency were investigated. The results show that increasing reaction temperature and reaction time increases the decomposition rates of mullite and corundum and alumina extraction efficiency, with the decomposition temperature of mullite lower than that of corundum. After 90 min reaction at 220 °C, more than 100 g alumina was extracted when recycling 1 L of alkaline solution. The decomposition processes of mullite and corundum corresponded with the shrinking unreacted core model, and the reaction rate was under chemical reaction control, with the activation energies of mullite and corundum being 67.46 and 161.82 kJ/mol, respectively.
引文
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[5]HOU Li-jun,LIU Tao-yong,LU An-xian.Red mud and fly ash-based ceramic foams using starch and manganese dioxide as foaming agent[J].Transactions of Nonferrous Metals Society of China,2017,27:591-598.
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[29]MURRAY J,KIRWAN L,LOAN M,HODNETT B K.In-situ synchrotron diffraction study of the hydrothermal transformation of goethite to hematite in sodium aluminate solutions[J].Hydrometallurgy,2009,95:239-246.
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[31]GIERéR G,CARLETON L E,LUMPKIN G R.Micro-and nano-chemistry of fly ash from a coal-fired power plant[J].American Mineralogist,2003,88:1853-1865.
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[33]GERSON A R,ZHENG K L.Bayer process plant scale:Transformation of sodalite to cancrinite[J].Journal of Crystal Growth,1997,171:209-218.
[34]RADOMIROVIC T,SMITH P,SOUTHAM D,TASHI S,JONES F.Crystallization of sodalite particles under Bayer-type conditions[J].Hydrometallurgy,2013,137:84-91.
[35]MOLOY E,LIU Q Y,NAVROTSKY A.Formation and hydration enthalpies of the hydrosodalite family of materials[J].Microporous and Mesoporous Materials,2006,88:283-292.
[36]KENDRICK E,DANN S.Synthesis,properties and structure of ion exchanged hydrosodalite[J].Journal of Solid State Chemistry,2004,177:1513-1519.
[37]LEVENSPIEL O.Chemical reaction engineering[M].3rd ed.New York:Wiley,1972.
[2]CHENG Wei,BIAN Zheng-fu,DONG Ji-hong,LEI Shao-gang.Soil properties in reclaimed farmland by filling subsidence basin due to underground coal mining with mineral wastes in China[J].Transactions of Nonferrous Metals Society of China,2014,24:2627-2635.
[3]HUANG K,KATSUTOSHI I,HIROYUKI H,HIDETAKA K,KEISUKE O.Leaching behavior of heavy metals with hydrochloric acid from fly ash generated in municipal waste incineration plants[J].Transactions of Nonferrous Metals Society of China,2011,21:1422-1427.
[4]ZHANG Yi-xin,DONG Ji-xiang,GUO Fan-hui,SHAO Zhong-ye,WU Jian-jun.Zeolite synthesized from coal fly ash produced by a gasification process for Ni2+removal from water[J].Minerals,2018,8:1-14.
[5]HOU Li-jun,LIU Tao-yong,LU An-xian.Red mud and fly ash-based ceramic foams using starch and manganese dioxide as foaming agent[J].Transactions of Nonferrous Metals Society of China,2017,27:591-598.
[6]CHO J H,EOM Y J,PARK J M,LEE S B,HONG J H,LEE T G.Mercury leaching characteristics of waste treatment residues generated from various sources in Korea[J].Waste Management,2013,33:1675-1681.
[7]MARTíN J A R,NIKO N.Soil as an archive of coal-fired power plant mercury deposition[J].Journal of Hazardous Materials,2016,308:131-138.
[8]P?YKI?R,M?KEL?M,WATKINS G,NURMESNIEMI H,DAHL O.Heavy metals leaching in bottom ash and fly ash fractions from industrial-scale BFB-boiler for environmental risks assessment[J].Transactions of Nonferrous Metals Society of China,2016,26:256-264.
[9]DAI Shi-feng,ZHAO Lei,PENG Su-ping,CHOU Chen-lin,WANGXi-bo,ZHANG Yong,LI Dan,SUN Ying-ying.Abundances and distribution of minerals and elements in high-alumina coal fly ash from the Jungar Power Plant,Inner Mongolia,China[J].International Journal of Coal Geology,2010,81:320-332.
[10]YUAN Guo-jun,ZHANG Jian-bin,ZHANG Yong-feng,YAN Yi-nan,JU Xin-xin,SUN Jun-min.Characterization of high-alumina coal fly ash based silicate material and its adsorption performance on volatile organic compound elimination[J].Korean Journal of Chemical Engineering,2015,32:436-445.
[11]National Bureau of Statistics of China.China statistical year book[M].Beijing:China Statistics Press,2015.(in Chinese)
[12]BAI Guang-hui,QIAO Yun-hai,SHEN Bo,CHEN Shuang-li.Thermal decomposition of coal fly ash by concentrated sulfuric acid and alumina extraction process based on it[J].Fuel Processing Technology,2011,92:1213-1219.
[13]SANGITA S,NAYAK N,PANDA C R.Extraction of aluminium as aluminium sulphate from thermal power plant fly ashes[J].Transactions of Nonferrous Metals Society of China,2017,27:2082-2089.
[14]GUO Chun-bin,ZOU Jing-jing,JIANG Yin-shan,HUANGTian-ping,CHENG Yan,WEI Cun-di.Thermal activation of coal fly ash by sodium hydrogen sulfate for alumina extraction[J].Journal of Materials Science,2014,49:4315-4322.
[15]WU Yu-sheng,XU Ping,CHEN Jiao,LI Lai-shi,LI Ming-chun.Effect of temperature on phase and alumina extraction efficiency of the product from sintering coal fly ash with ammonium sulfate[J].Chinese Journal of Chemical Engineering,2014,22:1363-1367.
[16]XIAO Yong-feng,SUN Qi,WANG Bao-dong,LIU Xiao-tong,WANG Xiao-huan,YU Geng-zhi.A study on sintering process optimization of alumina attraction from fly ash[J].Light Metals,2014,2014:117-119.
[17]YANG Quan-cheng,MA Shu-hua,ZHENG Shi-li,ZHANG Ran.Recovery of alumina from circulating fluidized bed combustion Al-rich fly ash using mild hydrochemical process[J].Transactions of Nonferrous Metals Society of China,2014,24:1187-1195.
[18]LI Hui-quan,HUI Jun-bo,WANG Chen-ye,BAO Wei-jun,SUNZhen-hua.Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method[J].Hydrometallurgy,2014,147:183-187.
[19]WU Cheng-you,YU Hong-fa,ZHANG Hui-fang.Extraction of aluminum by pressure acid-leaching method from coal fly ash[J].Transactions of Nonferrous Metals Society of China,2012,22:2282-2288.
[20]TRIPATHY A K,SARANGIA C K,TRIPATHYA B C,SANJAYA K,BHATTACHARYAA I N,MAHAPATRAA B K,BEHERAB P K,SATPATHY B K.Aluminium recovery from NALCO fly ash by acid digestion in the presence of fluoride ion[J].International Journal of Mineral Processing,2015,138:44-48.
[21]MATJIE R H,BUNT J R,van HEERDEN J H P.Extraction of alumina from coal fly ash generated from a selected low rank bituminous South African coal[J].Minerals Engineering,2005,18:299-310.
[22]LI Lai-shi,LIAO Xin-qin,WU Yu-sheng,LIU Ying-ying.Extracting alumina from coal fly ash with ammonium sulfate sintering process[J].Light Metals,2012,2012:215-217.
[23]BI Shi-wen.Alumina production process[M].Beijing:Chemical Industry Press,2006.(in Chinese)
[24]WANG Ze-hua,MA Shu-hua,TANG Zhen-hua,WANG Xiao-hui,ZHENG Shi-li.Effects of particle size and coating on decomposition of alumina-extracted residue from high-alumina fly ash[J].Journal of Hazardous Materials,2016,308:253-263.
[25]SU Shuang-qing,YANG Jing,MA Hong-wen,JIANG Fan,LIUYu-qin,LI Ge.Preparation of ultrafine aluminum hydroxide from coal fly ash by alkali dissolution process[J].Integrated Ferroelectrics,2011,128:155-162.
[26]DING Jian,MA Shu-hua,ZHENG Shi-li,ZHANG Yi,XIE Zong-li,SHEN S,LIU Zhong-kai.Study of extracting alumina from high-alumina PC fly ash by a hydro-chemical process[J].Hydrometallurgy,2016,161:58-64.
[27]ZHU Guo-rui,TAN Wei,SUN Jun-min,GONG Yan-bing,ZHANGSheng,ZHANG Zhan-jun,LIU Li-yan.Effects and mechanism research of the desilication pretreatment for high-aluminum fly ash[J].Energy Fuels,2013,27:6948-6954.
[28]BARIN I I.Thermochemical Data of Pure Substances[M].3rd ed.New York:VCH Publishers Inc,1995.
[29]MURRAY J,KIRWAN L,LOAN M,HODNETT B K.In-situ synchrotron diffraction study of the hydrothermal transformation of goethite to hematite in sodium aluminate solutions[J].Hydrometallurgy,2009,95:239-246.
[30]CHUNG F H.Quantitative interpretation of X-ray diffraction patterns of mixtures.I:Matrix-flushing method for quantitative multicomponent analysis[J].Journal of Applied Crystallography,1974,7:519-525.
[31]GIERéR G,CARLETON L E,LUMPKIN G R.Micro-and nano-chemistry of fly ash from a coal-fired power plant[J].American Mineralogist,2003,88:1853-1865.
[32]ARMSTRONG J A,DANN S E.Investigation of zeolite scales formed in the Bayer process[J].Microporous and Mesoporous Materials,2000,41:89-97.
[33]GERSON A R,ZHENG K L.Bayer process plant scale:Transformation of sodalite to cancrinite[J].Journal of Crystal Growth,1997,171:209-218.
[34]RADOMIROVIC T,SMITH P,SOUTHAM D,TASHI S,JONES F.Crystallization of sodalite particles under Bayer-type conditions[J].Hydrometallurgy,2013,137:84-91.
[35]MOLOY E,LIU Q Y,NAVROTSKY A.Formation and hydration enthalpies of the hydrosodalite family of materials[J].Microporous and Mesoporous Materials,2006,88:283-292.
[36]KENDRICK E,DANN S.Synthesis,properties and structure of ion exchanged hydrosodalite[J].Journal of Solid State Chemistry,2004,177:1513-1519.
[37]LEVENSPIEL O.Chemical reaction engineering[M].3rd ed.New York:Wiley,1972.