硫酸铵焙烧粉煤灰的熟料溶出动力学研究
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摘要
对硫酸铵焙烧粉煤灰的熟料溶出过程进行了动力学研究,根据不同温度、不同搅拌强度、不同液固比中Al2O3的溶出率和反应时间的关系,计算该反应的表观活化能为19.93 kJ/mol,熟料的溶出过程受通过固体产物层的内扩散控制,动力学方程为:1+2(1-x)-3(1-x)2/3=4.52exp{-19929/RT}·t。在液固比8:1,溶出温度为90℃,搅拌强度为300 r/min,溶出时间70 min的条件下,Al2O3的溶出率可达84%。
The dissolving kinetics of the clinker obtained from roasting process of fly ash and ammonium sulfate is studied. According to the changes of Al2 O3 dissolving ratio with the changes of time at different dissolving temperature, stirring speed and water-to-ore, the apparent activation energy for the dissolving reaction is 19.93 kJ/mol. The clinker dissolving process is controlled by the internal diffusion on the solid product layer and the kinetics equation of the dissolving process was obtained as: 1+2(1-x)-3(1-x)2/3=4.52 exp{-19929/RT}·t. The dissolving ratio of Al2 O3 reaches 84% under the optimum conditions including mass ratio of water-to-ore of 8:1, temperature of 90℃, stirring speed of 300 r/min and stirring time of 70 min.
The dissolving kinetics of the clinker obtained from roasting process of fly ash and ammonium sulfate is studied. According to the changes of Al2 O3 dissolving ratio with the changes of time at different dissolving temperature, stirring speed and water-to-ore, the apparent activation energy for the dissolving reaction is 19.93 kJ/mol. The clinker dissolving process is controlled by the internal diffusion on the solid product layer and the kinetics equation of the dissolving process was obtained as: 1+2(1-x)-3(1-x)2/3=4.52 exp{-19929/RT}·t. The dissolving ratio of Al2 O3 reaches 84% under the optimum conditions including mass ratio of water-to-ore of 8:1, temperature of 90℃, stirring speed of 300 r/min and stirring time of 70 min.
引文
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[2]Sen SK,Das M M,Bandyopadhyay P,eta1.Green process using hot spring bacterium to concentrate alumina in coal fly ash[J].Ecological Engineering,2016,88:10-19.
[3]周金华.粉煤灰制备氧化铝的研究进展[J].辽宁化工,2009,38(2):116-118.
[4]李来时,翟玉春,吴艳,等.硫酸浸取法提取粉煤灰中氧化铝[J].轻金属,2006(12):9-12.
[5]唐云,陈福林.碱石灰烧结法提取粉煤灰中的氧化铝[J].矿冶工程,2008,28(6):73-75.
[6]Yao ZT,Xia MS,Sarker PK,eta1.A review of the alumina recovery from coal fly ash with a focus in China[J].Fuel,2014,120(3):74-85.
[7]杨敬杰,林艳,孙红娟,等.粉煤灰提取氧化铝技术的研究进展.硅酸盐通报,2017,36(2):485-490.
[8]杨权成,马淑花,谢华,等.高铝粉煤灰提取氧化铝的研究进展[J].矿产综合利用,2012(3):3-6.
[9]蒋训雄.高铝粉煤灰提取氧化铝技术现状与发展趋势[J].有色金属工程,2017,7(2):30-35.
[10]Li H,Hui J,Wang C,et al.Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method[J].Hydrometal lurgy,2014,(147-148):183-187.
[11]郭强.粉煤灰酸法提取氧化铝的工艺研究进展[J].洁净煤技术,2015,21(5)::115-1l8,122.
[12]Yang QC,Ma SH,Zheng SL,eta1.Recovery of alumina from circulating fluidized bed combustion A1 rich fly ash using mild hydmchemical process[J].Transactions of Nonferrous Metals Society of China,2014,24(4):1187-1195.
[13]万亚萌,王宝庆,王丹,任保增.粉煤灰回收氧化铝工艺研究进展[J].无机盐工业,2016,48(11):7-11.
[14]Liu X,Wang BD,Yu GZ,eta1.Kinetics study of predesilication reaction for alumina are recovery from alumina rich fly ash[J].Materials Research Innovations,2014,18(82):541-546.
[15]Xu DH,Li HQ,BaoWJ,eta1.A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4+H2SO4mixed solution[J].Hydrometallurgy,2015,165:336-344.
[16]孙培梅,童军武,薛冰,等.从粉煤灰中提取氧化铝熟料的溶出过程动力学[J].中南大学学报:自然科学版,2013,44(9):3599-3603.
[17]王若超,翟玉春.硫酸氢铵焙烧粉煤灰提取氧化铝熟料溶出动力学[J].有色金属:冶炼部分,2013(9):22-25+30.
[18]隋丽丽,翟玉春.硫酸氢铵焙烧高钛渣的溶出动力学研究[J].材料导报,2013,27(18):137-140.
[19]曹明,郭兴忠,杨辉.麦饭石中微量元素的溶出及其动力学特征[J].广东微量元素科学,2004(06):45-49.
[20]隋丽丽,翟玉春,孙莹莹.粉煤灰硫酸氢铵焙烧法提取氧化铝的研究[J].有色金属:冶炼部分,2017(4):20-24.
[21]华一新.冶金过程动力学导论[M].北京:冶金工业出版社;2004:180-225.
[22]李洪桂.湿法冶金学[M].长沙:中南大学出版社,2002:68-110.