CO2 mineralization of carbide slag for the production of light calcium carbonates

Zhang, Tongyang; Chu, Guanrun; Lyu, Junlin; Cao, Yongda; Xu, Wentao; Ma, Kui; Song, Lei; Yue, Hairong; Liang, Bin

doi:10.1016/j.cjche.2022.02.011

Cited by 19 publications

(16 citation statements)

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“…It takes about 25 kg of water, 1620 kW∙h of energy, and 1.87 kg of CO 2 to produce 1 kg NCC. The profit is about 4250 CNY/kg NCC, which is better than the existing research 7 . The escaped CO 2 can be reinjected into the reactor to ensure a CO 2 uptake rate of 20%.…”

Section: Resultsmentioning

confidence: 94%

“…This signifies a notably advantageous rate for pure CO 2 flow, and the recycled gas can be cyclically passed through the solution to significantly enhance carbon fixation rates. Taking into account all conversion requirements, it proves to be a highly efficient method for carbon absorption, irrespective of the final carbonized product 7 . When it comes to regulating subsequent calcium carbonate products, the addition of lye significantly affects carbon uptake efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…Taking into account all conversion requirements, it proves to be a highly efficient method for carbon absorption, irrespective of the final carbonized product. 7 When it comes to regulating subsequent calcium carbonate products, the addition of lye significantly affects carbon uptake efficiency. Figure 3B depicts the pH change that occurs after introducing the potassium hydroxide solution in the carbonation reaction.…”

Section: Analysis Of Co 2 Uptake Capacitymentioning

confidence: 99%

“…The profit is about 4250 CNY/kg NCC, which is better than the existing research. 7 The escaped CO 2 can be reinjected into the reactor to ensure a CO 2 uptake rate of 20%. A high CO 2 uptake rate is forgone in pursuit of substantially higher profits on NCC, so that there is wider participation to achieve CO 2 neutrality.…”

Section: Evaluation Of the Overall Optimizationmentioning

confidence: 99%

“…The indirect CCR treatment method involves leaching calcium ions from CCR and carbonating them with carbon dioxide (CO 2 ) to produce nano calcium carbonate (NCC). 5,6 Although hydrochloric acid-based leaching agents are commonly used for leaching, 7 chloride ions can lead to significant pipeline corrosion issues and increased wastewater treatment costs, thereby elevating operational expenses. 8 Several studies have explored alternative leaching agents to mitigate problems associated with chloride ions.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of calcium carbide residue utilization for producing high‐quality calcium carbonate

Yang,

Li,

Xun

et al. 2023

Greenhouse Gases

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In light of the current situation where the utilization of calcium carbide slag yields low profits but holds significant potential for reducing carbon emissions, ammonium acetate was employed to leach calcium carbide slag. It also played a crucial role in regulating the products of indirect carbon dioxide carbonation when mixed with glycine and lye. Ammonium acetate's significance underscores its dual role in both the leaching and carbonation processes. This process yielded calcium carbonate with particle sizes smaller than 100 nm, with a purity of 98% and a single vaterite phase. The calcium carbide residue demonstrated an impressive CO2 uptake rate of 23.5%. Ammonium acetate exhibited an efficiency of 79.2% as a leaching agent. The ammonium acetate method demonstrated enhanced environmental friendliness and facilitated a more efficient carbon uptake rate of 23.5% compared to conventional indirect methods. Furthermore, the addition of lye, glycine, and ammonium acetate effectively extended the nucleation time of the calcium carbonate crystals and induced the formation of more vaterite intermediates with smaller particle sizes. The influence mechanism of compound additives on the carbonation reaction was revealed through kinetic analysis and molecular dynamics. This innovative approach offers a promising avenue for simultaneously treating solid waste and reducing CO2 emission. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Co 2 Uptake Capacitymentioning

confidence: 99%

Section: Evaluation Of the Overall Optimizationmentioning

confidence: 99%