Development of sintering-resistant CaO-based sorbent derived from eggshells and bauxite tailings for cyclic CO2 capture

Shan, Shaoyun; Aihua, Ma; Hu, Yicheng; Wang, Yaming; Peng, Jinhui

doi:10.1016/j.envpol.2015.10.028

Cited by 44 publications

(16 citation statements)

References 44 publications

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“…Therefore, there was no clear advantage of using these natural sorbents rather than limestone from the reactivity point of view. Shan et al [77] have also examined eggshells mixed with bauxite tailings (BT) to see how the latter impacted the ability to capture CO 2 . They found that the addition of BT was beneficial to the process with a carbonation conversion of 55% after 40 cycles.…”

Section: Other Natural Materialsmentioning

confidence: 99%

Calcium looping sorbents for CO2 capture

2016

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Calcium looping (CaL) is a promising technology for the decarbonation of power generation and carbon-intensive (cement, lime and steel) industries. Although CaL has been extensively researched, some issues need to be addressed before the deployment of this technology at commercial scale. One of the important challenges for CaL is decay of sorbent reactivity during capture/regeneration cycles. Numerous techniques have been explored to enhance natural sorbent performance, to create new synthetic sorbents, and to reactivate and re-use deactivated material. This review provides a critical analysis of natural and synthetic sorbents developed for use in CaL. Special attention is given to the suitability of modified materials for utilisation in fluidised-bed systems. Namely, besides requirements for a practical adsorption capacity; a mechanically strong material, resistant to attrition, is required for the fluidised bed CaL operating conditions. However, the main advantage of CaL is that it employs a widely available and inexpensive sorbent. Hence, a compromise must be made between improving the sorbent performance and increasing its cost, which means a relatively practical, scalable, and inexpensive method to enhance sorbent performance, should be found. This is often neglected when developing new materials focusing only on very high adsorption capacity.

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Section: Other Natural Materialsmentioning

confidence: 99%

Calcium looping sorbents for CO2 capture

2016

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“…However, it is reported that 0.2 t of BTs is generated from every 1 t of bauxite ores processed by flotation. In China, large quantities of BTs are stored in tailing reservoirs after flotation [13]. Unfortunately, most of these BTs are deposited on land without any further treatment, which not only occupies landmass but also potentially causes leaching and heavy metal runoff, and as a result, secondary effects, such as deforestation, soil erosion, increases in water turbidity [14], and disturbances of the hydrology cycle [15] , may occur.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Properties of Foamed Mixture Lightweight Soil Mixed with Bauxite Tailings as Filler

Peng

Jiang

et al. 2019

Advances in Materials Science and Engineering

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To make better use of large amounts of discarded bauxite tailings (BTs), a foamed mixture lightweight soil mixed with BTs as filler (FMLSB) was proposed. Using the orthogonal experimental design method, the effects of various contents of cement, BTs, and foam on the fluidity, wet density, unconfined compressive strength, water absorption, and microstructure of FMLSB were studied. The experimental results indicate that the wet density and unconfined compressive strength increase as the contents of cement and BTs increase but decrease as the foam content increases. Water absorption increases with the reduction of the wet density, but the unconfined compressive strength exponentially increases as the wet density increases. With an increase in the contents of cement and BTs and a decrease in the foam content, fewer pores are present, and the pores are not connected with each other. The results of the range analysis show that the main factor affecting the wet density and unconfined compressive strength of the FMLSB is the foam content, followed by the cement content, and meanwhile, BTs can maintain the lightweight and high strength of FMLSB. Based on the intended engineering applications and standard specifications, the optimum composition of the FMLSB mixture is proposed. Overall, the results indicate that BTs have the potential to be used as filler to produce FMLSB and that applications of FMLSB will lead to great economic and environmental benefits in engineering construction.

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“…However, few studies have been found in the literature regarding the application of bauxite tailings mud in engineering. It has been reported that bauxite tailings mud and blast furnace slag roasting can be used to prepare geopolymers [ 16 ], efficient CaO-based adsorbents can be prepared by using cheap CaCO 3 and bauxite tailings mud [ 17 ], and bauxite tailings mud and eggshells can be used as raw materials to synthesize porous CaO-based adsorbents by solid-phase method [ 18 ]. In general, it is far away to consume a large amount of bauxite tailings mud by the current utilization methods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Engineering Characteristics and Microscopic Mechanism of Red Mud–Bauxite Tailings Mud Foam Light Soil

Chen

Jiang

et al. 2022

Materials

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In order to effectively utilize aluminum industrial waste—red mud and bauxite tailings mud—and reduce the adverse impact of waste on the environment and occupation of land resources, a red mud–bauxite tailings mud foam lightweight soil was developed based on the existing research results. Experiments were conducted to investigate the mechanical properties and microscopic characteristics of the developed materials with different proportions of red mud and bauxite tailings mud. Results show that with the increase in red mud content, the wet density and fluidity of the synthetic sample was increased. With 16% red mud content, the water stability coefficient of the synthetic sample reached its maximum of 0.826, as well as the unconfined compressive strength (UCS) of the sample cured for 28 d (1.056 MPa). SEM images reveal that some wastes of the sample without red mud were agglomerated, the peripheral hydration products were less wrapped, and when the amount of red mud was 16%, the hydration products tightly wrapped the waste particles and increased the structural compactness. The final concentration of alkali leaching of samples increased with the addition of red mud. The maximum concentration of alkali leaching was 384 mg/L for the group with the addition of red mud of 16%. Based on the obtained mechanical strength and alkali release analysis, the sample B24R16 was selected as the optimum among all tested groups. This study explored a way to reuse aluminum industrial waste, and the results are expected to be applied to roadbed and mining filling.

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Development of sintering-resistant CaO-based sorbent derived from eggshells and bauxite tailings for cyclic CO2 capture

Cited by 44 publications

References 44 publications

Calcium looping sorbents for CO2 capture

Calcium looping sorbents for CO2 capture

Investigating the Properties of Foamed Mixture Lightweight Soil Mixed with Bauxite Tailings as Filler

Analysis of Engineering Characteristics and Microscopic Mechanism of Red Mud–Bauxite Tailings Mud Foam Light Soil

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