Inorganic Chemicals Industry >
Study on existing speciation and deep dechlorination of chlorine in waste incineration fly ash
Received date: 2020-08-13
Online published: 2021-05-12
The chlorine content of fly ash in waste incineration affects its proportion in the cement kiln co-treatment of raw materials,so fly ash needs to be dechlorinated.XRD was used to study the existing speciation of elemental chlorine,which showed that chlorine existed in fly ash in two forms of water-soluble chlorine and water-insoluble chlorine.The water-soluble chlornde in fly ash of grate furnace were CaCl2·Ca(OH)2·H2O,CaCl2·2H2O,CaClOH,KCl and NaCl,and the water-insoluble chlorine were Ca10(Si2O7)2(SiO4)Cl2(OH)2 and AlOCl,etc. The water-soluble chlorine in fly ash of fluid-bed existed in the forms of CaCl2·2H2O and KCl and the water-insoluble chlorine existed in the forms of AlOCl,Ca10(Si2O7)2(SiO4)Cl2(OH)2 and Ca4OCl6 and so on.The experimental results of water elution to remove water-soluble chlorine showed:for the fly ash of grate furnace,under the conditions of 10+4+2 of liquid-solid ratio(mL/g) and washing for three times at room temperature, the water-soluble chlorine removal rate could reach 97.01%;for the fly ash of fluid-bed,under the conditions of 6+6+4 of liquid-solid ratio and washing for three times at room temperature,the removal rate of water-soluble chlorine could reach 99.17%.Washing with acid and alkaline,high-temperature calcination could reduce the water-insoluble chlorine content of fly ash.The residual chlorine content of fly ash of grate furnace and the fly ash of fluid-bed after calcination were 0.36% and 0.45% respectively.
Yuexiang Wang , Lanyan Shao , Tiannan Xu , Caihong Cai , Junsheng Yuan , Yingwu Zhang . Study on existing speciation and deep dechlorination of chlorine in waste incineration fly ash[J]. Inorganic Chemicals Industry, 2021 , 53(5) : 78 -83 . DOI: 10.11962/1006-4990.2020-0360
[1] | 王雷, 金宜英, 刘建国, 等. 焚烧飞灰水泥窑共处置[J]. 环境工程, 2009,27(S1):527-532,496. |
[2] | 张国亮, 李忠锋, 黄岚, 等. 水泥窑协同处置垃圾焚烧飞灰技术工程应用[J]. 水泥, 2017(S1):8-12. |
[3] | 唐新宇, 黄庆. 水泥窑协同处置垃圾焚烧飞灰技术的应用进展[J]. 水泥技术, 2019(1):79-82. |
[4] | 王益峰, 祝红梅, 蒋旭光. 水泥窑协同处置危险废物的研究现状及其发展[J]. 环境污染与防治, 2018,40(8):943-949. |
[5] | Ryunosuke K. Recycling of municipal solid waste for cement produc-tion:Pilot-scale test for transforming incineration ash of solid waste into cement clinker[J]. Resources,Conservation and Recycling, 2001(31):137-147. |
[6] | 肖海平, 茹宇, 李丽, 等. 水泥窑协同处置生活垃圾焚烧飞灰过程中二噁英的迁移和降解特性[J]. 环境科学研究, 2017,30(2):291-297. |
[7] | Chan Chris C Y, Kirk Donald W. Behavior of metals under the con-dition of roasting MSW incinerator fly ash with chlorinating agen-ts[J]. Hazardous Materials, 1999,64:75-89. |
[8] | 韩春华, 谢峻林. 预分解系统结皮堵塞的研究进展[J]. 新世纪水泥导报, 2004(1):13-15. |
[9] | 周建国, 张曙光, 李萍, 等. 城市生活垃圾焚烧飞灰水洗脱氯实验研究[J]. 天津城建大学学报, 2015,21(6):417-422. |
[10] | Zhu F, Takaoka M, Oshita K, et al. Comparison of two types of mu-nicipal solid waste incinerator fly ashes with different alkaline rea-gents in washing experiments[J]. Waste Management, 2009,29(1):259-264. |
[11] | 白晶晶, 张增强, 闫大海, 等. 水洗对焚烧飞灰中氯及重金属元素的脱除研究[J]. 环境工程, 2012,30(2):104-108. |
[12] | Zhao K X, Hu Y Y, Tian Y Y, et al. Chlorine removal from MSWI fly ash by thermal treatment:Effects of iron/aluminum additiv-es[J]. Journal of Environmental Sciences, 2020,88:112-121. |
[13] | 王梦璐, 汪群慧, 王晓娜, 等. 生活垃圾渗滤液脱除垃圾焚烧飞灰中氯及重金属的实验[J]. 环境工程, 2019,37(9):144-148. |
[14] | 常威. 生活垃圾焚烧飞灰的水洗及资源化研究[D]. 杭州:浙江大学, 2016. |
[15] | 武博然, 王冬扬, 柴晓利. 生活垃圾焚烧飞灰生物脱氯机制研究[J]. 中国环境科学学, 2015,35(8):2470-2476. |
[16] | Chen W S, Chang F C, Shen Y H, et al. Removal of chloride from MSWI fly ash[J]. Journal of Hazardous Materials, 2012,237/238:116-120. |
[17] | 陈德珍, 林瑜, 汪雄平, 等. 改性石灰吸收HCl气体过程中的物理化学特性[J]. 同济大学学报:自然科学版, 2004(1):72-77. |
[18] | Suthatta D, Suched L, Dao J. Mechanisms of chloride and sulfate removal from municipal-solid-waste-incineration fly ash(MSWI FA):Effect of acid-base solutions[J]. Waste Management, 2020,101:44-53. |
[19] | 朱芬芬, 柳晓燕, 韩媚玲, 等. 烧结升温方式及气氛对水洗焚烧飞灰晶体演变的影响[J]. 中国环境科学, 2019,39(10):4212-4220. |
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