Carbon emission free preparation of calcium hydroxide with calcium carbide slag (CCS) through micro-bubble impurities removal

Ma, Weiping; Zhu, Ganyu; Li, Huiquan; Meng, Ziheng; Zhang, Kaixuan; Yan, Kun; Yang, Yue; Li, Zhanbing; Zhang, Jianbo; Wang, Chenye

doi:10.1016/j.jclepro.2023.138669

Cited by 5 publications

(2 citation statements)

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“…Herein, CS after pre-treatment (P-CS) was used, and the method and mechanism of impurity removal has been reflected in another published study . The compositions, particle sizes, and thermogravimetric (TG) properties of CS and P-CS are shown in Section 3.1.…”

Section: Methodsmentioning

confidence: 99%

“…Herein, CS after pre-treatment (P-CS) was used, and the method and mechanism of impurity removal has been reflected in another published study. 30 The compositions, particle sizes, and thermogravimetric (TG) properties of CS and P-CS are shown in Section 3.1. A high-temperature tube furnace (Tianjin Zhonghuan) was used to prepare P-CS calcination products in different reaction atmospheres.…”

Section: Experimental Apparatus and Processmentioning

confidence: 99%

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An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

Ma,

Zhu,

Guan

et al. 2024

ACS Sustainable Resour. Manage.

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Calcium carbide slag (CS) is an industrial solid waste produced via the coal-based poly(vinyl chloride) process, and its main component is calcium hydroxide (Ca(OH) 2 ) (85−95 wt %). CS can be used instead of calcium carbonate (CaCO 3 ) to produce calcium oxide (CaO), reducing carbon dioxide (CO 2 ) emissions. Our group has reported that CaO can be prepared at lower temperatures using CS compared with existing processing temperature, where the calcination temperature decreases from 1000 to 700 °C when CaCO 3 is replaced with CS during CaO production. A comparison of the carbon emissions of CS and CaCO 3 -based CaO preparation processes show that using CS to produce CaO reduces CO 2 emissions by 977.62 kg/t. Herein, the CS-based CaO is explained by controlling the CS calcination temperature and mineral transformation. CS completely decomposes into CaO at 492 °C. The calcination temperature of CS is between 400 and 600 °C, where CaCO 3 is formed via the reaction of carbon and Ca(OH) 2 and water in CS. Furthermore, when the carbon content in CS is >4%, CaCO 3 is formed. When the calcination temperature is 700 °C, CaCO 3 decomposes into CaO. As the temperature increases, the metallurgical activity of CS increases, and its strength decreases. When the temperature is 700 °C, the compressive strength of CaO is 21.94 MPa, its metallurgical activity is 379.85 mL, and the CaO content is 95.14%. This study provides a new method for preparing CaO to simultaneously reduce carbon emissions and in-situ recycle CS.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Apparatus and Processmentioning

confidence: 99%