稻壳灰中温热处理稳固化垃圾飞灰重金属

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Abstract The rice husk ash and the fly ash produced by a waste-to-energy plant were adopted as the raw materials for the stabilization of heavy metals in municipal solid waste incineration (MSWI) using intermediate-temperature thermal treatment. The effect of combustion temperature, heat treatment time and added ratio of rice husk ash on the stabilization of heavy metals in MSWI fly ash was investigated. In a certain temperature range, the main products of the reaction were CSSF (i.e.Ca₁₀(SiO₄)₃ (SO₄)₃F₂), Ca₃SiO₅ and other silicate crystalline,which steadied heavy metals in the silicate lattice. At the same time, after heat treatment, the unstable acid soluble state of heavy metals changed into stable oxidation state and residual state, which realized the stabilization of heavy metals in MSWI fly ash. The increase of heat treatment time and the added ratio of rice husk ash resulted in the increase of silicate species and crystallinity in heat treated samples, and hence the gradual decrease of heavy metal leaching concentration. When the added ratio of rice husk ash was in the range of 2%~4%, the concentration of heavy metal leaching by medium temperature heat treatment samples was low. When the added ratio was too high (more than 6%), the leaching concentration of heavy metals gradually increased.

Key words： municipal solid waste incineration fly ash rice husk ash intermediate-temperature thermal treatment heavy metals

Received: 24 December 2019

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X705

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	TAN Jin-tao
	WU Xin
	LI Jun-hui
	LIU Bin
	LIANG Cai

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TAN Jin-tao,WU Xin,LI Jun-hui等. Stabilization of heavy metals in MSWI fly ash by thermal treatment at intermediate temperatures with rice husk ash[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 3054-3060.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/3054

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