基于Box-Behnken设计优化白银炉电收尘脱砷工艺  

Optimization of Arsenic Removal for Electrostatic Precipitator Dust from Baiyin Furnace Based on Box-Behnken Design

作　　者：魏晓玲 王晓阳 方红生 李慧颖 王文祥 WEI Xiao-ling;WANG Xiao-yang;FANG Hong-sheng;LI Hui-ying;WANG Wen-xiang(Department of Mining and Metallurgical Engineering,Baiyin Polytechnic of Mining and Metallurgy,Baiyin 730900,Gansu,China;Department of Environmental Engineering,Guangdong Polytechnic of Environmental Protection and Engineering,Foshan 528216,Guangdong,China;Guangdong Provincial Engineering and Technical Research Center for Solid Waste Recycling and Heavy Metal Pollution Control,Foshan 528216,Guangdong,China)

机构地区：[1]白银矿冶职业技术学院矿冶工程系,甘肃白银730900 [2]广东环境保护工程职业学院环境工程系,广东佛山528216 [3]广东省固体废弃物资源化与重金属污染控制工程技术研究中心,广东佛山528216

出　　处：《矿冶工程》2020年第2期86-89,93,共5页Mining and Metallurgical Engineering

基　　金：甘肃省高等学校科研项目(2018A291);广东省基础与应用基础研究基金⁃面上项目(2020A1515011007);广西重点研发计划资助项目(2019AB18001);广东普通高校创新团队项目(2017GKCXTD004)。

摘　　要：采用低温碱性焙烧-热水浸出工艺脱除白银炉电收尘(EPD)中的砷,主要考察了焙烧过程中碱料比、焙烧温度、焙烧时间对砷浸出率的影响,并利用响应曲面法的Box-Behnken设计优化工艺参数。结果表明,3个因素对EPD中砷的浸出率均有影响,其中焙烧温度对砷浸出率影响最大。结合单因素实验结果及Box-Behnken设计优化后焙烧条件为:碱料比1.2,焙烧温度600℃,焙烧时间2 h。优化条件下,EPD中砷浸出率为90.76%,铅、锌、铜、铋均不浸出。低温碱性焙烧-热水浸出工艺能实现EPD中砷的选择性脱除,有价金属富集在浸出渣中得以综合回收。A process consisting of low-temperature alkaline roasting and hot water leaching was used to remove arsenic in electrostatic precipitator dust(EPD)from Baiyin furnace.Effects of alkali-to-material ratio,roasting temperature and roasting time on the arsenic leaching rate were investigated,and the process parameters were optimized based on the Box-Behnken design with response surface method.The results show that three factors all can bring effects on the leaching rate of arsenic in EPD,and the roasting temperature has the greatest effect on the arsenic leaching rate.Based on the single-factor experimental results and the Box-Behnken design,the roasting conditions are optimized as follows:alkali-to-material ratio of 1.2,roasting temperature at 600℃and roasting time of 2 h.Under the optimal conditions,the leaching rate of arsenic from EPD is 90.76%,and lead,zinc,copper and bismuth are almost not leached.It is shown that the low-temperature alkaline roasting-hot water leaching process can realize the selective removal of arsenic from EPD,and the valuable metals concentrated in the leaching slag can be comprehensive recovered.

关 键 词：白银炉电收尘 脱砷 响应曲面法 低温碱性焙烧 烟尘 

分 类 号：TF81[冶金工程—有色金属冶金] X758[环境科学与工程—环境工程]