摘要
为实现垃圾焚烧飞灰中氯离子的高效稳定脱除,提出了水洗脱氯的技术思路。以湖南省某垃圾焚烧厂飞灰为研究对象,通过X射线荧光分析明确其高氯含量(22.58%)的特性,系统研究了水洗时间、振荡速度、洗脱温度、液固比及水洗液循环利用对氯离子脱除率的影响。结果表明,水洗时间不宜过长,增大振荡速度、洗脱温度、液固比有助于提高氯脱除率,水洗液循环利用时仍能达到较好的脱氯效果。最佳水洗脱氯工艺条件为:液固比15 mL/g、水洗时间20 min、震荡速度200 r·min^(-1)、洗脱温度35℃,氯脱除率>93.67%以上。建议采用多级逆流水洗的方式,充分利用水洗废液对氯的洗脱作用,最大限度实现废液循环利用,同时确保最终的水洗脱氯效果。
To achieve efficient and stable removal of chloride ions from municipal solid waste incineration fly ash,a water washing dechlorination technology approach has been proposed.Taking the fly ash from a waste incineration plant in Hunan Province as the research object,its high chlorine content(22.58%)was confirmed through XRF analysis.The study systematically explored the effects of water washing time,oscillation speed,washing temperature,solid-liquid ratio,and the recycling of washing water on the chloride ion removal rate.The results indicated that the water washing time should not be too long,and increasing the oscillation speed,washing temperature,and solid-liquid ratio can enhance the chloride removal rate.Additionally,recycling the washing water still achieved a good dechlorination effect.The optimal conditions for water washing dechlorination are:a solid-liquid ratio of 15 mL/g,a washing time of 20 min,an oscillation speed of 200 r·min^(-1),and a washing temperature of 35℃,achieving a chloride removal rate of over 93.67%.It is recommended to adopt a multi-stage counter-current water washing method to fully utilize the dechlorination effect of the washing waste liquid in order to maximize recycling of the waste liquid while ensuring the final dechlorination effectiveness.
作者
曹喆
姜科
彭艳春
幸晓琳
黄佳威
CAO Zhe;JIANG Ke;PENG Yanchun;XIN Xiaolin;HUANG Jiawei(School of Environmental Engineering,Changsha Environmental Protection College,Changsha 410004,China)
出处
《山东化工》
2025年第14期202-205,共4页
Shandong Chemical Industry
基金
2023年度湖南省教育厅科学研究项目(23C1063)。
关键词
垃圾焚烧飞灰
水洗脱氯
工艺条件
资源化
municipal solid waste incineration fly ash
water washing dechlorination
process conditions
resource utilization
