摘要
将3个不同电厂的粉煤灰球磨后得到超细粉煤灰,选择HCl、H2SO4、NaOH、Ca(OH)2和Na2CO3等对超细粉煤灰进行化学改性。结果表明,采用Ca(OH)2改性效果最好,经过Ca(OH)2改性的3种超细粉煤灰对Cr6+的去除率提高2.01～2.44倍。Ca(OH)2改性超细粉煤灰对Cr6+的吸附热力学研究表明,3种改性超细粉煤灰在25℃、35℃和45℃对Cr6+的吸附符合Langmuir吸附等温式,吸附过程为自发、放热过程。同时,分析了Ca(OH)2改性超细粉煤灰的机理,研究了吸附饱和改性超细粉煤灰的脱附再生方法。
Three kinds of coal fly ash were collected from three thermal power plants. Raw coal fly ash was ball milled and ultra-fine coal fly ash was obtained. The ultra-fine coal fly ash was modified by HCl, H2SO4, NaOH, Ca（OH）2 and Na2CO3, respectively. The results showed that Ca（OH）2 was the best modifier and the removal rates of Cr^6＋ increased by 2.01-2.44 times after modification. The isotherms of Cr^6＋ adsorption onto three kinds of modified ultra-fine coal fly ash all could be descibed by the Langmuir isotherms at 25 ℃, 35 ℃ and 45 ℃, and the adsorption process was spontaneous and exothermic. The modification mechanism of Ca（OH）2 and methods of regeneration by desorption were also discussed.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2008年第4期569-572,576,共5页
Chemical Industry and Engineering Progress
基金
中国博士后科学基金项目(20070411124)
陕西省科技厅工业攻关项目(2006k07-G19)
陕西省教育厅产业化培育项目(06JC11)
西安市科技局工业攻关项目(GG06074)资助
关键词
超细粉煤灰
改性
吸附
CR^6+
ultrafine coal fly ash
modification
adsorption
Cr^6＋
