摘要
以去除锌冶炼废水中的钙镁离子、回收利用废水为目的,采用斜发沸石选择性吸附钙镁离子的方法,研究了不同改性剂对斜发沸石的改性效果,以及吸附时间、吸附温度、沸石粒径、搅拌强度等因素对吸附效果的影响。结果表明:用质量分数为15%的氢氧化钠改性沸石效果最佳,其对钙镁离子的吸附量与未活化的天然沸石相比可提高63%。活化改性沸石对钙镁离子的吸附量随吸附时间的延长开始增加得很快然后变慢,90 min基本达到饱和。升高吸附温度,活化改性沸石对钙镁离子的吸附量增加不明显;减小沸石粒径、增大搅拌强度,其吸附量显著增加,说明离子交换反应速率较快,内外扩散过程对吸附效果的影响较明显。静态等温吸附过程符合Langmiur吸附等温方程式。废水中其他离子的存在使吸附量降低26%。
To the end of the removal of calcium-magnesium ions in zinc metallurgy wastewater and making use of the wastewater,method of clinoptilolite selectively absorbing calcium-magnesium ions was adopted. Modification effect of different modifiers on clinoptilolite was discussed;Besides, influences of several factors including absorption time, temperature, granularity of clinoptilolite,and stirring intensity etc. on absorption effect were also considered. Results showed that 15% （ mass fraction） NaOH was the best modifier and adsorption capacity of modified clinoptilolite to calcium-magnesium ions increased by 63% comparing with unmodified natural clinoptilolite,at the same time the absorption capacity of modified clinoptilolite began to increase rapidly and then slow down as time went on and the absorption was basically saturated in 90 min. Furthermore, the capacity increased indistinctly with constantly elevating temperature, however,it increased markedly with reducing the granularity and augmenting the stirring intensity ,which explained that ion exchange reaction speed was fast and the inside and outside diffusion process could obviously affect absorption effect. Static isothermal adsorption process was in accord with Langmiur adsorption isothermal equation. By the way,other ions existing in wastewater can lower adsorptive capacity of 26%.
出处
《无机盐工业》
CAS
北大核心
2010年第3期45-47,共3页
Inorganic Chemicals Industry
基金
化学工程联合国家重点实验室开放课题资助项目(SKL-ChE-08A05)
青海省重点科技攻关项目(2008-G-109)
关键词
斜发沸石
锌冶炼废水
钙镁离子
吸附
clinoptilolite
zinc metallurgy wastewater
calcium-magnesium ions
absorption
