废旧稀土荧光粉与氢氧化钠焙烧反应动力学
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摘要
研究了废旧稀土荧光粉与氢氧化钠焙烧过程动力学,考察焙烧温度和氢氧化钠用量对反应速率的影响,并建立了反应动力学模型。结果表明,焙烧反应的动力学过程符合收缩核反应模型,表观活化能为77.512kJ/mol,化学反应速率对整个反应过程的影响最显著,焙烧反应的动力学方程为:1-(1-x)~(1/3)=0.4181×exp[-77512/(RT)]t。
Roasting reaction kinetics of waste rare earth fluorescent powders with sodium hydroxide was studied.The effects of roasting temperature and ratio of sodium hydroxide to waste rare earth fluorescent powders on roasting reaction rate were investigated.Model of reaction kinetics was obtained.The results show that roasting process meets shrinking core model with apparent activation energy of 77.512kJ/mol.Chemical reaction rate has significant influence on reaction process.The kinetic equation is 1-(1-x)~(1/3)=0.4181×exp[-77512/(RT)]t.
Roasting reaction kinetics of waste rare earth fluorescent powders with sodium hydroxide was studied.The effects of roasting temperature and ratio of sodium hydroxide to waste rare earth fluorescent powders on roasting reaction rate were investigated.Model of reaction kinetics was obtained.The results show that roasting process meets shrinking core model with apparent activation energy of 77.512kJ/mol.Chemical reaction rate has significant influence on reaction process.The kinetic equation is 1-(1-x)~(1/3)=0.4181×exp[-77512/(RT)]t.
引文
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[2]苑文仪,孟雯,王晓岩,等.机械活化强化废弃荧光粉中稀土金属的回收[J].上海第二工业大学学报,2015,32(1):1-6.
[3]李洪枚.从废稀土荧光粉中酸浸回收稀土的研究[J].稀有金属,2010,34(6):898-904.
[4]杨幼明,邓声华,谢芳浩,等.从荧光粉废料中提取稀土工艺研究[J].有色金属(冶炼部分),2012(10):23-26.
[5]RABAH M A.Recyclables recovery of europium and yttrium metals and some salts from spent fluorescent lamps[J].Waste Management,2008,28(2):318-325.
[6]YANG F,KUBOTA F,BABA Y,et al.Selective extraction and recovery of rare earth metals from phosphor powders in waste fluorescent lamps using an ionic liquid system[J].Journal of Hazardous Materials,2013,254-255:79-88.
[7]OTSUKI A,MEI Guangjun,JIANG Yuren,et al.Solidsolid separation of fluorescent powders by liquid-liquid extraction using aqueous and organic phases[J].Resources Procsessing,2006,53(3):121-133.
[8]SHIMIZU R,SAWADA K,ENOKIDA Y,et al.Supercritical fluid extraction of rare earth elements from luminescent material in waste fluorescent lamps[J].Journal of Supercritical Fluids,2005,33(3):235-241.
[9]吴玉锋,贾平平,王维,等.从废弃CRT荧光粉中熔浸稀土元素的研究[J].中国稀土学报,2013,31(6):723-728.
[10]李瑞卿,吴玉锋,章启军,等.高温碱熔法提取稀土三基色荧光粉废料中稀土[C]//2012国际冶金及材料分析测试学术报告会(CCATM2012)论文集.北京,2012:795-799.
[11]唐永波,朱宪忠,王海波,等.BaMgAl10O17∶Eu蓝色荧光粉的研究进展[J].材料导报,2006,20(增刊1):335-338.
[12]华一新.冶金过程动力学导论[M].北京:冶金工业出版社,2004:188-193.
[13]隋丽丽.绿色综合利用钛渣的理论与工艺研究[D].沈阳:东北大学,2014.