Abstract: Aiming at achieving the synergistic effect of CO2 mineralization for emission reduction and industrial solid waste utilization for building mate-rials, we studied the carbon dioxide fixing and compression strength enhancement characteristics of the mineralization of fly ash-calcium carbide slag slurry. Specifically, we investigated the effects of calcium carbide slag ratio, curing temperature and mineralization reaction time on the compression strength of the gelled block samples. According to the results, the gelled block with superior 3 d strength could be obtained under the calcium carbide slag proportion of 30% and the curing temperature of 60 ℃. When the proportion of the carbide slag lay in 20%—50%, mineralization reaction time for achieving best strength of the sample showed a trend of first prolonging then shortening as the increasing proportion of carbide slag. The peak value of 3 d strength achieved under the carbide slag proportion of 40% and the mineralization reaction time of 50 min, which was 82.1% higher than that of the sample without mineralization reaction. XRD analysis indicated that the calcium hydroxide diffraction peak of the sample completely disappeared after 30 min carbonation reaction, accompanied by the appearance of notable CaCO3 diffraction peaks. TGA test results demonstrated that there was an obvious mass loss peak for CaCO3 decomposition of the samples. Corresponding to the carbide slag proportion of 20%, 30% and 40%, the samples with best 3 d strength showed Ca(OH)2 retention rates of 75.6%, 68.4% and 64.8%, carbonization degrees of 7.9%, 5.7% and 10.2%, the capability for mineralized immobilization of CO2 were 7 kg,13 kg and 31 kg per ton of the samples.
1 Ma Zhao, Wang Chuanqin, Li Guangxue, et al. Modernization, 2015, 35(3), 34 (in Chinese). 马钊,王传琴,李广学,等.现代化工,2015,35(3),34. 2 Yao Xingliang. Study on physical and chemical properties of steel slag ultrafine powder and its basic research on desulfurization and carbon fixation. Master's Thesis, Shanxi University, China, 2017 (in Chinese). 姚星亮.钢渣超微粉理化特性及其脱硫固碳基础研究. 硕士学位论文,山西大学, 2017. 3 Jew A D, Rupp E C, Geatche D L, et al. Energy & Fuels, 2015, 29(9),564. 4 Xiong Chuansheng, Wang Wei, Zhu Qi, et al. Jiangsu Building Mate-rials, 2009(3), 23 (in Chinese). 熊传胜,王伟,朱琦,等.江苏建材, 2009(3),23. 5 Florinn, Fennell P. Energy Procedia, 2011,4,830. 6 Zhong Pan, Luo Jinjing, Xue S S, et al. Environmental Sanitation Engineering, 2008, 16(1), 19 (in Chinese). 潘钟,罗津晶,薛姗姗,等.环境卫生工程,2008,16(1),19. 7 Pan Kai.Study on the application of steel slag carbonation fixed carbon dioxide and preparation of building materials. Master's Thesis, Guangxi University, China, 2014 (in Chinese). 潘凯.钢渣碳酸化固定二氧化碳及制备建材产品应用研究. 硕士学位论文,广西大学, 2014. 8 He Z R.Study on the effect of water vapor on CO2 characteristics of cal-cium carbide slag recycling calcination/carbonation capture. Master's Thesis, Shandong University, China, 2016 (in Chinese). 何梓睿.水蒸气对电石渣循环煅烧/碳酸化捕集CO2特性影响研究. 硕士学位论文,山东大学, 2016. 9 Ren Guohong, Liao Hongqiang, Wu Haibin, et al. Journal of Environmental Engineering, 2018, 12(8), 2295 (in Chinese). 任国宏,廖洪强,吴海滨,等. 环境工程学报,2018,12(8),2295. 10 Dong Wenchen, Kang Dejun, Wang Lijiu. Building Materials World, 2004, 25(3), 28(in Chinese). 董文辰, 康德君, 王立久.建材世界, 2004, 25(3),28.
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2019, Vol. 33 
