Inorganic Chemicals Industry >
Research on dechlorination from dry ash of coal-fired power plants
Received date: 2020-11-09
Online published: 2021-10-11
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
Ganghua Qin , Biao Chen , Xiangdong Feng , Hui Chen , Qing Sun , Jian Zhang , Jiawei Sheng . Research on dechlorination from dry ash of coal-fired power plants[J]. Inorganic Chemicals Industry, 2021 , 53(10) : 104 -107 . DOI: 10.19964/j.issn.1006-4990.2020-0602
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