摘要
分析铜渣组成结构和形貌特性的基础上,研究了铜渣与含砷污酸反应行为及脱砷规律,阐明了反应动力学过程,揭示了铜渣除砷机理.结果表明:在铜渣用量为0.2g/mL,反应温度为23℃,反应时间为24h的最优条件下,铜渣的最大去除容量达到25.89mg/g,除砷率达到99.56%,并且除砷后铜渣的砷浸出浓度低于5mg/L的危险废弃物界定限值,属于一般固体废弃物.铜渣除砷过程符合拟二级动力学模型,该过程受铁离子释放速度限制,离子交换吸附和化学沉淀方式同步进行实现了砷的脱除,两种方式的结合有利于砷的稳定化.铜渣与污酸反应释放大量的铁离子,通过离子交换吸附与砷酸根离子发生沉淀反应,形成较为稳定的砷酸盐及其衍生化合物,进而达到除砷目的.铜渣表现出优越的除砷性能,为重有色冶炼污酸处置提供了一种高效和低成本的方法.
On the basis of composition and phase characteristics of copper slag,the reaction behavior of copper slag with arsenic-containing waste acid and the rule of arsenic removal were investigated,and the reaction kinetics of arsenic removal was also elucidated.Under optimal conditions,including a copper slag dosage of 0.2g/mL,a reaction temperature at 23 C,and a reaction time of 24hours,a maximum adsorption capacity of copper slag of 25.89mg/g was achieved,following by an arsenic removal efficiency of 99.56%.The leaching toxicity of arsenic-fixed copper slag was lower than 5mg/L that is the standard threshold value of hazardous waste.The arsenic-fixed copper slag could be classified as a general solid waste.The kinetic studies revealed that the arsenic adsorption on the copper slag was described by a pseudo-second-order kinetic equation.The process of arsenic removal was limited by the release rate of iron ion.Arsenic was removed via the ion exchange adsorption and the chemical precipitation,which were also beneficial to the arsenic stabilization.A large number of iron ions were released during the solid-liquid reaction between copper slag and waste acid,which could precipitate arsenic via the ion exchange adsorption and the chemical precipitation,forming relative stable arsenates and their derivatives for the arsenic removal.The copper slag exhibits a superior performance for the arsenic removal from waste acid and provides a high-efficient and low-cost method for the disposal of waste acid from heavy non-ferrous smelting industry.
作者
李永奎
祝星
祁先进
王华
张鑫
惠兴欢
郝峰焱
蔡贵远
LI Yong-kui;ZHU Xing;*;QI Xian-jin;WANG Hua;ZHANG Xin;HUI Xing-huan;HAO Feng-yan;CAI Gui-yuan(State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Chuxiong Dianzhong Non-ferrous Metal Co.Ltd,Chuxiong 675000,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2019年第10期4228-4238,共11页
China Environmental Science
基金
国家自然科学基金资助项目(51764036)
昆明理工大学校企基金项目(KKZ4201552002)
关键词
铜渣
含砷污酸
除砷
动力学
copper slag
arsenic-containing waste acid
arsenic removal
kinetics
作者简介
责任作者:祝星,副教授,zhuxing2010@hotmail.com;李永奎(1993-),男,云南红河人,昆明理工大学冶金与能源工程学院硕士研究生,主要从事固体废物资源化利用研究.
