垃圾焚烧飞灰水洗脱氯及重金属Zn的浸出特性研究
Study on the performance of water washing dechlorination from domestic waste incineration fly ash and the leaching characteristics of heavy metal Zn
邓天天 1李晗晟 1李爽 2丁苏 1暴彦婷 1李振宇1
作者信息
- 1. 河南工程学院环境与生物工程学院,河南 郑州 451191
- 2. 河南省岩石矿物测试中心,河南 郑州 450003
- 折叠
摘要
以生活垃圾焚烧飞灰为原材料,通过单因素实验和响应面优化实验研究了飞灰脱氯的最佳水洗条件以及飞灰中Zn的最佳浸出条件.结果表明,在最佳水洗条件(水洗温度35 ℃、水洗时间10 min、水洗液固比10 mL/g)下,飞灰氯离子洗脱率为73.4％,二次水洗后,氯离子洗脱率可达96.8％.酸浸实验中,不同种类酸对飞灰中Zn的浸出效果为盐酸＞硝酸＞单宁酸(TA)＞二乙烯三胺五乙酸(DTPA)＞乙二胺四乙酸二钠(EDTA).采用响应面优化法确定飞灰中Zn的最佳盐酸浸出条件为:浸出液固比10 mL/g,盐酸摩尔浓度2.0 mol/L,浸出时间8 h,此时Zn浸出率可达到70.48％.
Abstract
The single factor experiments and response surface optimization experiments were conducted to explore the optimal water washing conditions for dechlorination and the optimal leaching conditions for Zn in domestic waste incineration fly ash.The results showed that under optimized conditions(washing temperature 35 ℃,washing time 10 minutes,washing liquid-solid ratio 10 mL/g),the dechlorination of fly ash could reach 73.4％.After secondary washing,the removal rate of chloride ions reached 96.8％.The leaching characteristics of Zn in fly ash were compared using different types of acids.The results showed that the leaching rates of different leaching agents were as follows:hydrochloric acid＞nitric acid＞tannic acid(TA)＞diethylenetriamine pentaacetic acid(DTPA)＞disodium ethylene diaminetetra acetic acid(EDTA).The optimal hydrochloric acid leaching conditions for Zn were determined by response surface optimization method:liquid-solid ratio of 10 mL/g,hydrochloric acid concentration of 2.0 mol/L and leaching time of 8 hours.At this point,the leaching rate of Zn could reach 70.48％.
关键词
垃圾焚烧飞灰/水洗脱氯/Zn/浸出Key words
domestic waste incineration fly ash/water eluting chloride/Zn/leaching引用本文复制引用
基金项目
国家自然科学基金面上项目(42377490)
河南省科技攻关项目(222102320055)
河南省自然科学基金项目(2023KJ005)
河南省高等学校青年骨干教师培养计划项目(2020GGJS238)
2022年度河南工程学院教育教学改革研究项目(2022JYZD08)
出版年
2024
NETL
NSTL
万方数据