Influence of Hydrothermal Pre-Treatment of Coal Fly on the Synthesis of Belite Phase
Influence of Hydrothermal Pre-Treatment of Coal Fly on the Synthesis of Belite Phase
摘要
In this paper, the results of an extensive investigation of hydrothermal pre-treatment for synthesizing belite phase from reactive mixtures （CaO/SiO2 molar ratio of 2） consisting of one waste kinds （bottom ash-BA or fly ash-FA） from fluidised brown coal combustion in Slovakian power plant and CaO （analytical grade reagent） addition are summarized. Changes in structure and phase composition of hydrothermally synthesized belite precursors and subsequent calcinated products were compared with those of starting mixtures. Based on XRD diffraction patterns, the formation of the new profiles corresponding to CSH phases with low degree of ordering as belite precursors after hydrothermal treatment was confirmed. Calcination of hydrotermally treated products at 900℃ led to transformation of CSH phases to wollastonite, belite and gehlenite phase. Differences in phase composition of products before and after calcination depend upon waste quality and precursor＇s synthesis conditions. Bottom ash isn＇t suitable as raw material for synthesizing belite phase because of high CaO content fixed in anhydrite form （44.1%）. Coal fly ash with low CaO content in anhydrite form （4.2%） and its hydrothermal treatment in combination with subsequent heating offer opportunities for the utilization of coal fly ash as raw material for belite production.
参考文献19
-
1W. Jiang, D.M. Roy, Hydrothermal processing of new fly ash cement, American Ceramic Society Bulletin 71 (1992) 642-647.
-
2A. Guerrero, S. Goni, A. Macias, M.P. Luxan, Mechanical properties, pore size distribution, and pore solution of fly ash-belite cement mortars, Cement Concrete Research 29 (1999) 1753-1758.
-
3A. Guerrero, S. Goni, A. Macias, Durability of new fly ash-belite cement mortars in sulfated and chloride medium, Cement Concrete Research 30 (2000) 1231-1238.
-
4A. Guerrero, S. Goni, A. Macias, M.P. Luxan, Effect of thesynthesis temperature on the hydration reaction of fly ah-bellite cement mortars, Cement Concrete Research 30 (2000) 553-559.
-
5F.A. Rodrigues, Low-temperature sysnthesis of cement from rice hull ash, Cement Concrete Research 33 (2003) 1525-1529.
-
6A. Guerrero, S. Goni, I. Campillo, A. Moragues, Belite cement clinker from coal fly ash of high Ca content: Optimization of synthesis parameters, EnvironmentalScience Technology 38 (2004)3209-3213.
-
7A. Guerrero, S. Goni, A. Moragues, J.S. Dolado,Microstructure and mechanical performance of belite cements from high calcium coal fly ash, Journal of the American Ceramic Society 88 (2005) 1845-1853.
-
8A. Guerrero, S. Goni, J.S. Dolado, Belite cements:Modifications of calcium silicate hydrate (C-S-H) gel by alkaline hydrothermal treatment, ACI Materials Journal 106 (2009) 3209-3213.
-
9L. Kacimi, A. Simon-Masseron, S. Salem, A. Ghomari, Z.Derriche, Synthesis of belite cement clinker of hihghydraulic reactivity, Cement Concrete Research 39 (2009) 559-565.
-
10K. Pimraksa, S. Hanjitsuwan, P. Chindaprasirt, Synthesis of belite cement from lignite fly ash, Ceramics International 35 (2009) 2415-2425.
-
1新型催化剂[J].化工文摘,2001(4):28-28.
-
2李帅,周华.氨基磺酸亚锡的合成工艺研究[J].广东化工,2009,36(7):46-47.
-
3宁寻安,李凯,李润生.《水处理剂聚氯化铝》国家标准的修订[J].给水排水,2005,31(3):104-108.
-
4毛若卿,潘国耀,高琼英.氟硫硅酸钙（3C_2S·3CaSO_4·CaF_2）水硬活性的研究[J].武汉工业大学学报,1995,17(2):1-4.
-
5Evonik公司推出一种生物表面活性剂[J].中国洗涤用品工业,2017,0(4):97-97.
-
6周溪滢,向晓东,李灿华.钢渣生态安全性分析及无害化处理和应用进展[J].矿产综合利用,2014(3):8-11. 被引量：8
-
7周玉新,张娟,朱华娟,李哲伦,伍沅.撞击流反应-沉淀法制备纳米氧化镍[J].化学工程与装备,2009(8):13-16. 被引量：1
-
8罗婷,顾幸勇,陈超,董伟霞,郭琪煌.水热工艺在陶瓷石膏模制备中的应用研究[J].陶瓷学报,2016,37(6):691-694.
-
9孙高年.化学法制氧研究[J].低温与特气,1997,15(3):54-58. 被引量：22
-
10新闻动态[J].生命科学仪器,2007,5(1):53-53.
