燃煤电厂干化灰渣中氯的脱除研究

doi:10.19964/j.issn.1006-4990.2020-0602

Abstract

Abstract:

Dry ash is a solid waste with zero discharge of desulphurization wastewater from coal-fired power plants,but its re-source utilization is limited because of high content of chlorine.In addition,the zero-discharge technology of desulphurization wastewater has gradually become the mainstream.It is of great practical significance to study the efficient dechlorination method for dry ash.The element composition,crystal phase and structure of dry ash were characterized by XRF,XRD and IR.The process of chlorine removal in dry ash was studied by adding dechlorination agent Al₂O₃（mass fraction of 2.5%~10.0%）and combining with calcination method（600~900 ℃）.The optimized process parameters were as follows：calcination tempera-ture of 700 ℃,calcination time of 2 h,and Al₂O₃ addition amount of 7.5%.Under the optimized process,the dechlorination rate could reach 96.9%.And the preliminary mechanism of dechlorination agent Al₂O₃ was analyzed.

Key words: dry ash, chlorides, dechlorination agent Al₂O₃, calcination

CLC Number:

TQ124.41

Qin Ganghua,Chen Biao,Feng Xiangdong,Chen Hui,Sun Qing,Zhang Jian,Sheng Jiawei. Research on dechlorination from dry ash of coal-fired power plants[J]. Inorganic Chemicals Industry, 2021, 53(10): 104-107.

Figures/Tables 6

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References 26

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w（Al₂O₃）	w（SiO₂）	w（CaO）	w（Cl）	w（Fe₂O₃）	w（MgO）
30.6	29.9	13.0	8.51	4.89	3.69
w（SO₃）	w（F）	w（TiO₂）	w（K₂O）	w（Na₂O）
3.12	1.90	1.82	0.985	0.670

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Research on dechlorination from dry ash of coal-fired power plants

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