硫铝酸钙的氧化铝溶出性能
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摘要
使用分析纯CaCO_3、Al_2O_3与CaSO_4·2H_2O配料,在1375℃、保温2 h的条件下合成了纯物相硫铝酸钙3CaO·3Al_2O_3·CaSO_4(C_4A_3S),对其物相组成和微观形貌进行了表征。并探究了碳碱浓度、苛碱浓度、溶出温度、溶出时间、粒度等因素对C_4A_3S氧化铝溶出性能的影响。结果表明:C_4A_3S的氧化铝溶出性能随着碳碱与苛碱浓度的增加先提高,之后趋于稳定。粒度越小,溶出率越高。与七铝酸十二钙12CaO·7Al_2O_3(C_(12)A_7)相比,C_4A_3S的孔洞状结构使其氧化铝更易溶出,在10 min时氧化铝溶出率即达到98%以上,且溶出所需的碳碱浓度与溶出温度均低于C_(12)A_7。在最佳条件:碳碱80 g·L~(-1)、苛碱10 g·L~(-1)、溶出温度80℃、溶出时间10 min下,C_4A_3S的氧化铝溶出率为98.76%。
Analytically pure carbonate calcium, alumina and dihydrate calcium sulfate were used to synthesize calcium sulphoaluminate(3CaO·3Al_2O_3·CaSO_4, C_4A_3S) at 1375℃ for 2 h. The phase compositions and microstructure were characterized. The effects of carbon alkali concentration, alkali concentration, leaching temperature, leaching time and particle sizes on the alumina leaching properties of C_4A_3S were explored. The results show that the alumina leaching ratio of C_4A_3S increases with the increase of concentration of sodium carbonate and alkali, then trends to stable. The leaching ratio becomes higher when the particle size of clinker decreases. Compared with 12 CaO·7Al_2O_3(C_(12)A_7), the alumina of C_4A_3S is easier to be dissolved because of its porous structure, and the alumina leaching ratio is up to 98% under 10 min leaching. The concentration of sodium carbonate and the dissolution temperature of C_4A_3S is lower than that of C_(12)A_7. The alumina leaching ratio of C_4A_3S could reach 98.76% under the optimum conditions: sodium carbonate 80 g·L~(-1), alkali 10 g·L~(-1), dissolution temperature 80℃ and dissolution time 10 min.
Analytically pure carbonate calcium, alumina and dihydrate calcium sulfate were used to synthesize calcium sulphoaluminate(3CaO·3Al_2O_3·CaSO_4, C_4A_3S) at 1375℃ for 2 h. The phase compositions and microstructure were characterized. The effects of carbon alkali concentration, alkali concentration, leaching temperature, leaching time and particle sizes on the alumina leaching properties of C_4A_3S were explored. The results show that the alumina leaching ratio of C_4A_3S increases with the increase of concentration of sodium carbonate and alkali, then trends to stable. The leaching ratio becomes higher when the particle size of clinker decreases. Compared with 12 CaO·7Al_2O_3(C_(12)A_7), the alumina of C_4A_3S is easier to be dissolved because of its porous structure, and the alumina leaching ratio is up to 98% under 10 min leaching. The concentration of sodium carbonate and the dissolution temperature of C_4A_3S is lower than that of C_(12)A_7. The alumina leaching ratio of C_4A_3S could reach 98.76% under the optimum conditions: sodium carbonate 80 g·L~(-1), alkali 10 g·L~(-1), dissolution temperature 80℃ and dissolution time 10 min.
引文
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[2]朱妍,霍云波,郭秋影.氧化铝市场分析与展望[J].中国金属通报,2013,(4):27-29.ZHU Y,HUO Y B,GUO Q Y.Analysis and prospect of alumina market[J].China Metal Bulletin,2013,(4):27-29.
[3]顾松青.我国的铝土矿资源和高效低耗的氧化铝生产技术[J].中国有色金属学报,2004,14(S1):91-97.GU S Q.Alumina production technology with high efficiency and low consumption from Chinese bauxite resource[J].The Chinese Journal of Nonferrous Metals,2004,14(S1):91-97.
[4]杨静,蒋周青,马鸿文,等.中国铝资源与高铝粉煤灰提取氧化铝研究进展[J].地学前缘,2014,21(5):313-324.YANG J,JIANG Z Q,MA H W,et al.The bauxite resource in China and advances in the techniques of extracting alumina from high-alumina coal fly ash[J].Earth Science Frontiers,2014,21(5):313-324.
[5]王祝堂.浅析中国氧化铝工业技术发展方向[J].中国有色建设,2013,(3):40-41.WANG Z T.Analysis on the development trend of Chinese alumina industry[J].China Nonferrous Construction,2013,(3):40-41.
[6]李来时,翟玉春,秦晋国,等.以粉煤灰为原料制备高纯氧化铝[J].化工学报,2006,57(9):2189-2193.LI L S,ZHAI Y C,QIN J G,et al.Extracting high-purity alumina from fly ash[J].Journal of Chemical Industry and Engineering(China),2006,57(9):2189-2193.
[7]MOLDOVEANU G A,PAPANGELAKIS V G.Recovery of rare earth elements adsorbed on clay minerals(Ⅱ):Leaching with ammonium sulfate[J].Hydrometallurgy,2013,131/132:158-166.
[8]YAO Z T,XIA M S,SARKER P K,et al.A review of the alumina recovery from coal fly ash,with a focus in China[J].Fuel,2014,120:74-85.
[9]鲁桂林,迟松江,毕诗文.赤泥中氧化铝和氧化铁的浸出[J].材料与冶金学报,2010,9(1):31-34.LU G L,CHI S J,BI S W.Leachiing of alumina and iron oxide from red mud[J].Journal of Materals and Metallurgy,2010,9(1):31-34.
[10]王佳东,翟玉春,申晓毅.碱石灰烧结法从脱硅粉煤灰中提取氧化铝[J].轻金属,2009,(6):14-16.WANG J D,ZHAI Y C,SHEN X Y.Extracting Al2O3 from desiliconized fly ash with alkali lime sintering process[J].Light Metal,2009,(6):14-16.
[11]张佰永,周凤禄.粉煤灰石灰石烧结法生产氧化铝的机理探讨[J].轻金属,2007,(6):17-18,27.ZHANG B Y,ZHOU F L.The limestone sintering process to produce alumina with fly ash[J].Light Metal,2007,(6):17-18,27.
[12]李殷泰,毕诗文,段振瀛,等.关于广西贵港三水铝石型铝土矿综合利用工艺方案的探讨[J].轻金属,1992,(9):6-14.LI Y T,BI S W,DUAN Z Y,et al.Discussion on the comprehensive process of gibbsite bauxite in Guangxi[J].Light Metal,1992,(9):6-14.
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[14]王波,宗书凤,孙会兰,等.钙铝比对11.3Ca O·7Al2O3微观结构及其溶出性能的影响[J].化工学报,2014,65(10):4183-4190.WANG B,ZONG S F,SUN H L,et al.Influence of calcium/aluminum ratio on microstructure and leaching of11.3Ca O·7Al2O3[J].CIESC Journal,2014,65(10):4183-4190.
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[21]孙会兰,于海燕,王波,等.12Ca O·7Al2O3溶出动力学[J].中国有色金属学报,2008,18(10):1920-1925.SUN H L,YU H Y,WANG B,et al.Leaching dynamics of12Ca O·7Al2O3[J].The Chinese Journal of Nonferrous Metals,2008,18(10):1920-1925.