生活垃圾焚烧飞灰加速碳酸化深度除氯与水洗除氯对比研究

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Abstract MSWI fly ash samples from two incineration plants in China were sampled and used (TX fly ash and JX fly ash). The physical and chemical properties of the ash samples were analyzed, and three Cl removal methods (water flushing, water flushing with CO₂-ventilation, and water flushing with CO₂-ventilation + carbonate salts addition) were adopted to remove Cl from MSWI fly ash. The results revealed that the two fly ash samples contain a high content of Cl (16.95% for TX fly ash and 20.52% for JX fly ash). When treated with pure water, the maximum Cl removal ratios were 87.54% and 90.12%. Elevated temperature posed no significant influence on Cl removal using water flushing. CO₂-ventilation during water flushing improved Cl removal, reaching maximum removal ratios of 93.69% and 99.19%. In spite of the higher removal ratios of Cl with CO₂-ventilation, the high content of Ca²⁺ in the flushing solution remains a problem. Addition of carbonate salt after CO₂-ventilation effectively reduced the concentration of Ca²⁺ in the solution. XRD analysis of the treated fly ash revealed an enhanced decomposition of the hardly soluble Cl-containing salts by CO₂-ventilation, and calcite and gypsum became the major minerals after accelerated carbonation. The content of Cl in the CO₂-treated fly ash was below 1%, which satisfies the utilization standard in Technical Specification for Pollution Control of Fly Ash from Municipal Solid Waste Incineration (HJ1134-2020).

Key words： MSWI fly ash chloride removal carbonation reuse

Received: 26 January 2021

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X705

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	Articles by authors
	WEI Yun-mei
	YAO Rui-xuan
	CHEN Shuang
	ZHOU Hong-li
	LIU Si-jie

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WEI Yun-mei,YAO Rui-xuan,CHEN Shuang等. Removal of chloride from MSWI fly ash: a comparison of accelerated carbonation and water flushing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4184-4192.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4184

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