Study on the Characteristics of Heavy Metal Lead in Desulfurization Sludge Solidified by Coal-Fired Fly Ash in Power Plant

doi:10.12096/j.2096-4528.pgt.23043

Abstract

Abstract:

Objectives The enrichment of heavy metals in desulphurization sludge of coal-fired power plant is significant, so it is necessary to reduce the content of heavy metals in desulfurization sludge. Methods This paper put forward the idea of solidifying heavy metals in desulfurization sludge with fly ash from power plants and compared with common curing agents. Results Among cement, fly ash, chelating agent DTC (dithiocarbamate) and chelating agent TMT-15 (trisodium thiocyanate), fly ash has the best solidification effect on lead in desulfurization sludge. The solidification efficiency of different fly ash and desulfurization sludge is between 40% and 100%. The mechanism analysis shows that, similar to cement, the chemical composition of fly ash mainly contains SiO₂, Al₂O₃, CaO and Fe₂O₃, etc., which can react with desulfurization sludge to generate hydration products such as hydrated calcium silicate C-S-H and ettringite, etc. It is beneficial to the solidification of heavy metals. The products can adsorb heavy metals such as lead. Conclusions It can be seen that adding a certain proportion of fly ash into the desulfurization sludge of coal-fired power plants can realize the solidification and stability of lead, which provides a method for reducing the desulfurization sludge from dangerous solid waste to general solid waste.

Key words: coal-fired power plants, desulfurized sludge, fly ash, stable solidification

CLC Number:

TK 09

Hongwei ZHANG, Yongsheng ZHANG, Tao WANG, Jiawei WANG. Study on the Characteristics of Heavy Metal Lead in Desulfurization Sludge Solidified by Coal-Fired Fly Ash in Power Plant[J]. Power Generation Technology, 2024, 45(3): 527-534.

Figures/Tables 10

References 28

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序号	仪器	生产厂家	规格型号
1	电感耦合等离子体发射光谱仪	美国Leeman公司	Prodigy型
2	X射线荧光光谱(XRF)	美国赛默飞世尔科技	ARLAdvant’X Intellipower 3600
3	X射线多晶衍射(XRD)	德国布鲁克	Empyrean
4	场发射扫描电镜(SEM)	美国赛默飞世尔科技	Quattro C

序号	仪器	生产厂家	规格型号
1	电感耦合等离子体发射光谱仪	美国Leeman公司	Prodigy型
2	X射线荧光光谱(XRF)	美国赛默飞世尔科技	ARLAdvant’X Intellipower 3600
3	X射线多晶衍射(XRD)	德国布鲁克	Empyrean
4	场发射扫描电镜(SEM)	美国赛默飞世尔科技	Quattro C

各成分含量	京玉飞灰	三河飞灰	京隆飞灰	徐州飞灰
w(Al ₂ O ₃)	36.53	19.57	37.62	14.78
w(SiO ₂)	38.57	46.60	32.89	58.71
w(CaO)	7.60	11.74	8.57	2.02
w(Fe ₂ O ₃)	6.92	7.25	6.48	5.17
w(K ₂ O)	0.60	2.62	2.44	0.53
w(MgO)	0.56	0.84	1.65	0.59
w(MnO)	0.03	0.16	0.18	0.03
w(Na ₂ O)	0.44	2.27	1.26	0.55
w(P ₂ O ₅)	0.29	0.53	1.90	0.03
w(ZrO ₂)	0.04	0.08	0.09	0.16
w(SrO)	0.06	0.72	0.30	0.06
w(TiO ₂)	1.28	0.82	1.53	1.04

各成分含量	京玉飞灰	三河飞灰	京隆飞灰	徐州飞灰
w(Al ₂ O ₃)	36.53	19.57	37.62	14.78
w(SiO ₂)	38.57	46.60	32.89	58.71
w(CaO)	7.60	11.74	8.57	2.02
w(Fe ₂ O ₃)	6.92	7.25	6.48	5.17
w(K ₂ O)	0.60	2.62	2.44	0.53
w(MgO)	0.56	0.84	1.65	0.59
w(MnO)	0.03	0.16	0.18	0.03
w(Na ₂ O)	0.44	2.27	1.26	0.55
w(P ₂ O ₅)	0.29	0.53	1.90	0.03
w(ZrO ₂)	0.04	0.08	0.09	0.16
w(SrO)	0.06	0.72	0.30	0.06
w(TiO ₂)	1.28	0.82	1.53	1.04

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