A green approach to prepare polymorph CaCO3 for clean utilization of salt gypsum residue and CO2 mineralization

Luo, Xingguo; Wei, Chang; Li, Xingbin; Deng, Zhigan; Li, Minting; Fan, Gang

doi:10.1016/j.fuel.2022.126305

Cited by 14 publications

(2 citation statements)

References 59 publications

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“…The mixer's rotation speed was set at 500 r/min. After 5 min of rotation, CO2 was passed at a rate of 1.0 L/min through the inflation port into the mixer [33]. The test time was set to 30 min.…”

Section: Experimental Stepsmentioning

confidence: 99%

Assessing the Performance of CO2-Mineralized Underground Backfilling Materials through the Variation Characteristics of Infrared Radiation Temperature Index

Cao,

Ma,

Osemudiamhen

et al. 2024

Minerals

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The utilization of CO2 mineralization fly ash (F) and coal gangue (G) technology is proposed in this research work to prepare underground backfilling materials. The test process can be divided into pre-treatment and post-treatment stages. In the pre-treatment stage, a sealed stirring vessel is used to conduct CO2 wet mineralization. The ratios of F and G were selected as follows: 20%:60% (F2G6), 30%:50% (F3G5), 40%:40% (F4G4), 50%:30% (F5G3), and 60%:20% (F6G2). The ratios were prepared into Φ50 mm × 100 mm cylindrical samples, with curing durations of 3 d, 7 d, 14 d, and 28 d. In the post-processing stage, the SANS microcomputer-controlled electronic universal testing machine and FLIR A615 infrared thermal imager were used to carry out uniaxial loading and temperature detection, respectively. The unconfined compressive strength (UCS), X-ray diffraction (XRD), average infrared radiation temperature (AIRT), variance of original infrared image temperature (VOIIT), and variance of successive minus infrared image temperature (VSMIT) of the samples were compared and analyzed. The results indicated that when curing reaches 14 d, the strength approaches its peak, with minimal changes in strength over a delayed period; furthermore, as the ratio of F to G continues to increase, the mineralization effect gradually strengthens, reaching its optimum level at a ratio of 5:3. However, when the ratio exceeds 5:3, signs of deteriorating mineralization effect start to appear. During the loading process, the AIRT of the mineralized samples showed a continuous increase, but the VOIIT and VSMIT of the mineralized sample both exhibited significant fluctuations or rapid increases during damage rupture. Moreover, the rise in the AIRT value was found to be linked to the increase in the ratio of F to G. This indicates that F has a higher thermal–mechanical conversion efficiency compared to G, so the temperature change will be greater during the loading process. The drastic changes in the VOIIT and VSMIT indicate that they can be used as sensitive response indicators for sample rupture, and can predict and warn of damage rupture in mineralized samples. Research work can provide practical guidance and reference for underground backfilling of CO2 mineralization industrial waste.

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Section: Experimental Stepsmentioning

confidence: 99%

Assessing the Performance of CO2-Mineralized Underground Backfilling Materials through the Variation Characteristics of Infrared Radiation Temperature Index

Cao,

Ma,

Osemudiamhen

et al. 2024

Minerals

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“…Although well developed, the conventional production methods have drawbacks such as high energy consumption and the depletion of natural ores [2,7,8]. To address these drawbacks, a novel method for producing calcium carbonate using calcium-containing industrial solid waste as a raw material rather than natural minerals has been developed [9,10]. Reacting CO 2 from flue gas with calcium from the industrial by-product gypsum (CaSO 4 ) produces calcium carbonate more economically than the traditional approach does by eliminating the additional stages of mining, grinding, and separation of natural minerals [11].…”

Section: Introductionmentioning

confidence: 99%

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Wang

et al. 2023

Sustainability

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To avoid the long-term pollution of land and water by industrial gypsum by-products, the exploitation of this resource has become a priority. The indirect synthesis of calcium carbonate from the industrial by-product gypsum has received substantial attention as a viable method for resource utilization. Currently, the primary problems in the indirect manufacture of calcium carbonate from the industrial by-product gypsum are additive recycling and process simplification. This paper describes the present state of development and compares various indirect mineralization systems. The factors affecting leaching and mineralization in the indirect mineralization of CO2 from by-product gypsum and the management of CaCO3 crystallinity are discussed, and the current additive regeneration cycle is summarized. The applications of other technologies in the indirect mineralization of by-product gypsum are also summarized, as are the obstacles, and required future work. This review provides guidelines for the laboratory indirect mineralization of by-product gypsum as well as practical applications.

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Resource potential of natural and synthetic gypsum waste

Prasad

2024

Environmental Materials and Waste

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A green approach to prepare polymorph CaCO3 for clean utilization of salt gypsum residue and CO2 mineralization

Cited by 14 publications

References 59 publications

Assessing the Performance of CO2-Mineralized Underground Backfilling Materials through the Variation Characteristics of Infrared Radiation Temperature Index

Assessing the Performance of CO2-Mineralized Underground Backfilling Materials through the Variation Characteristics of Infrared Radiation Temperature Index

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Resource potential of natural and synthetic gypsum waste

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