粉煤灰-电石渣制浆矿化的固碳增强特性

doi:10.11896/cldb.18120062

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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.

Key words： CO₂ mineralization calcium carbide slag fly ash carbon immobilization strength enhancement

Published: 12 September 2019

CLC number:

X752

Fund:This work was financially supported by Shanxi Province Key Research and Development (MC2016-02).

About author:: Guohong Ren, from September 2016 to July 2019, studied at Shanxi University to study the recycling of solid waste.
Hongqiang Liao, postdoctoral fellow at Tsinghua University, professor-level senior engineer. A well-known expert in the field of energy conservation and environmental protection and solid waste recycling in China; later entered Peking University and Shanxi University to engage in the development and application of new technologies for energy conservation, environmental protection and solid waste utilization, and more than 10 years; the subject, the national “Eleventh Five-Year” science and technology support project, the national “ Twelfth Five-Year” technology support project.

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	REN Guohong
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	CHENG Fangqin

Cite this article:

REN Guohong,LIAO Hongqiang,GAO Hongyu, et al. Carbon Dioxide-fixing and Compression Strength Enhancing Characteristics ofMineralized Immobilization of Fly Ash-Calcium Carbide Slag Slurry[J]. Materials Reports, 2019, 33(21): 3556-3560.

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http://www.mater-rep.com/EN/10.11896/cldb.18120062 OR http://www.mater-rep.com/EN/Y2019/V33/I21/3556

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