Cost-effective activated carbon (AC) production from partial substitution of coal with red mud (RM) as additive for SO2 and NOx abatement at low temperature

Niu, Jian; Zhang, Huirong; Li, Linbo; Guo, Yanxia

doi:10.1016/j.fuel.2021.120448

Cited by 31 publications

(3 citation statements)

References 39 publications

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“…Red mud could be used as an additive to modify activated carbon to prepare the dry desulfurization agent. After modi cation, the desulfurization rate of activated carbon with the addition of red mud was 17.9% higher than that of activated carbon alone (Niu et al 2021). The desulfurization rate of wet desulfurization is higher than that of dry desulfurization.…”

Section: Overall Utilization Status Of Bayer Red Mudmentioning

confidence: 94%

Summary of research progress on separation and extraction of valuable metals from Bayer red mud

Wang

Zhang²,

Liu³

et al. 2022

Environ Sci Pollut Res

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Bayer red mud is a strong alkaline solid waste discharged during alumina production. Due to large emissions and strong alkalinity, red mud is now mostly dammed or buried, which not only occupies huge land but also contaminates the surrounding ecosystem, causing the risk of collapse and landslide. In addition to its overall utilization in building materials, agriculture, the environment, and the chemical industry, red mud also contains valuable metals such as sodium, aluminum, iron, titanium, and scandium and is considered to be an important secondary resource. In this paper, the physicochemical properties and hazards of red mud are rst introduced, and then the overall utilization of red mud is summarized. Then, the latest research progress on the separation and extraction of valuable metals from red mud is reviewed in detail, and a new comprehensive utilization method is proposed and analyzed. This paper also provides suggestions for the future development direction of the comprehensive utilization technology of red mud.

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Section: Overall Utilization Status Of Bayer Red Mudmentioning

confidence: 94%

Summary of research progress on separation and extraction of valuable metals from Bayer red mud

Wang

Zhang²,

Liu³

et al. 2022

Environ Sci Pollut Res

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show abstract

“…Liu et al [28] used red mud-modified limestone for desulfurization by adsorption in a tube furnace. Niu et al [29] used red mud as an additive to activated carbon to improve the desulfurization capacity of activated carbon, and the maximum sulfur capacity was increased by 17.9% compared with activated carbon alone. Red mud is highly alkaline, and the slurry made from red mud for desulfurization is a wet desulfurization process.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Effects of Ultrasonic and Ball Milling on Red Mud Desulfurization

Liu

Zhang

2022

Metals

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Red mud desulfurization is an environmentally friendly desulfurization technology. After desulfurization, the acidity of red mud slurry continues to be neutralized for processing new red mud, and no waste acid is generated. At present, there is a lack of research on desulfurization intensification in external fields, etc. To further enhance red mud desulfurization, this paper used an SO2 detector, X-ray fluorescence spectrometer (XRF), and scanning electron microscope (SEM) to compare and analyze red mud desulfurization under the action of ball mill and ultrasonic external fields. In this study, experiments were conducted using a bubbling and stirring reactor device. The results showed that the suitable red mud slurry concentration was 10 g/L. The raw red mud desulfurization (without external field condition) could reach 100% absorption in the first 25 min, and the desulfurization rate dropped to 81.3% at 80 min. The mechanism of red mud desulfurization was investigated by X-ray diffractometer (XRD), XRF, and infrared spectroscopy. Under the action of the external field of the ball mill, the red mud particles could be refined to prolong the desulfurization time. The red mud after ball milling could reach 100% absorption within 33 min. Under the thermal effect of the ultrasound, 100% absorption could only be achieved within 23 min. From the desulfurization effect and XRF results, it was found that the ball mill was more suitable for promoting red mud desulfurization in the bubbling and stirring reactor.

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“…Jian Niu (2021) used red mud as an additive to activated carbon to improve the desulfurization capacity of activated carbon, and the maximum sulfur capacity was increased by 17.9% compared with activated carbon alone. Red mud is highly alkaline, and the slurry made from red mud for desulfurization is a wet desulfurization process.…”

mentioning

confidence: 99%

Study of Red Mud Desulfurization and External Field Action

Liu

Zhang

2022

Preprint

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To further enhance red mud desulfurization, this paper analyzes red mud desulfurization under the action of ball mills and ultrasonic external fields and studies the red mud desulfurization mechanism. In this study, experiments were conducted using a bottom-blow stirred reactor device. The results show that the suitable red mud slurry concentration is 10 g/L. The raw red mud desulfurization can reach 100% absorption in the first 25 min, and the absorption capacity decreases gradually with the reaction time. The red mud desulfurization is mainly due to the dissolution of free alkali and metal oxides in the red mud. Under the action of the external field of the ball mill, the red mud particles can be refined to prolong the desulfurization time. Under the action of the external field of ultrasonic waves, the red mud slurry is dispersed more uniformly, which can accelerate the reaction rate. Under the effect of an ultrasonic external field, the red mud slurry is dispersed more uniformly, which can accelerate the reaction rate and dissolve more metal substances in the liquid phase.

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Cost-effective activated carbon (AC) production from partial substitution of coal with red mud (RM) as additive for SO2 and NOx abatement at low temperature

Cited by 31 publications

References 39 publications

Summary of research progress on separation and extraction of valuable metals from Bayer red mud

Summary of research progress on separation and extraction of valuable metals from Bayer red mud

Comparison of the Effects of Ultrasonic and Ball Milling on Red Mud Desulfurization

Study of Red Mud Desulfurization and External Field Action

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