High-Efficiency Desulfurization of High-Sulfur Bauxite Calcined in a Conveyor Bed: Kinetics, Process, and Application

Jiu, Shaowu; Zhao, Bo; Chen, Yanxin

doi:10.3390/pr10081586

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…This reaction can be characterized by the shrinking core model of the PbSO 4 desulfation ( Figure a). [ 33–35 ]…”

Section: Resultsmentioning

confidence: 99%

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Ultra‐Fast Recyclable and Value‐Added Desulfation Method for Spent Lead Paste via Dual Intensification Processes

Chai,

Li,

Wang

et al. 2023

Advanced Science

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The new low‐cost clean pre‐desulfation technology is very important in pyrometallurgy and hydrometallurgy. However, traditional reactors have low space‐time yield and desulfation rate, resulting in high energy consumption and SO2 emissions in the industrial desulfation processes. Herein, dual rotating liquid film reactors (RLFRs) and lime are proposed to construct a recyclable, ultra‐fast, and value‐added desulfation method. Parameter optimization and kinetic calculations prove that the above reactions are controlled by internal diffusion, revealing that RLFR promotes the mass transfer and reaction rate. The new process greatly shortens the desulfation time of lead paste from 40 min to 10 s with a high desulfation rate of 99.7%, and the sulfation time of lime from 30 min to 30 s with a sulfation rate of 98.6% with a net profit of 55.99 ¥/ton by cost accounting. Moreover, ten batches of continuous scale‐up experiments demonstrate the stability of processes, the desulfation and sulfation rates are kept at 99.7% and 98.2%, which greatly reduces the emissions of waste desulfate liquor. This work provides a new universal strategy for a sustainable, low‐cost, and clean desulfation method of waste resources to achieve technical and economic feasibility.

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“…This reaction can be characterized by the shrinking core model of the PbSO 4 desulfation ( Figure a). [ 33–35 ]…”

Section: Resultsmentioning

confidence: 99%

“…This reaction can be characterized by the shrinking core model of the PbSO 4 desulfation (Figure 3a). [33][34][35] If the reaction process is controlled by a chemical reaction, the reaction kinetic equation can be written as [36] [1…”

Section: The Determination Of Kinetic Analyses For the Intensificatio...mentioning

confidence: 99%

Ultra‐Fast Recyclable and Value‐Added Desulfation Method for Spent Lead Paste via Dual Intensification Processes

Chai,

Li,

Wang

et al. 2023

Advanced Science

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“…Therefore, CO 2 and H 2 O (g) can be detected and separated using the TG-IR method [21]. Previous studies have confirmed the effectiveness of the characterization of CO 2 and H 2 O (g) released by the calcination of CSK [21,26]. The release flow of CO 2 is directly related to the combustion reaction of carbon, and the infrared absorption intensity can be used for the quantitative analysis of gas products.…”

Section: Introductionmentioning

confidence: 91%

Preparation of Calcined Kaolin by Efficient Decarburization of Coal-Series Kaolinite in a Suspended Bed Reactor

Cheng

Jiu

2022

Processes

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The reaction process, mechanism, and kinetics of the decarbonation of coal-series kaolinite (CSK) were investigated using the thermal analysis (TG)–infrared spectrum analysis (IR) coupling method. A pilot test was performed using a suspended calcination system. Further, the carbon content, phase composition, whiteness, oil-absorbed value, and micromorphology of calcined kaolin were characterized. Results showed that the decarburization reaction of CSK was a two-step reaction that mainly occurred in the ranges of 593 °C–836 °C. The mechanism of the decarburization reaction was a phase-boundary reaction (unreacted-core shrinking model) with an activation energy of 214.56 kJ/mol. Calcination at 900 °C or 950 °C for ~3.3 s in a suspension reactor resulted in the decarburization rate of CSK becoming >99.9%. The whiteness of calcined kaolin was mainly positively associated with the decarburization rate, and increasing the calcination temperature aided in increasing the whiteness. The oil-absorbed value of calcined kaolin was positively correlated with the specific surface area. Insufficient or over-calcination decreased the oil-absorbed value of calcined kaolin products. The calcined kaolin product with a whiteness of 89.3% and an oil-absorbed value of 76.1 g/100 g was obtained via suspension calcination process, which meets the requirements of calcined kaolin for paper-making.

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A Case Study of Producing Alumina from High-Sulfur Diasporic Bauxite: Sulfur-Containing Desilication Products and Pyrite in Red Mud

Wang,

Liu,

Wang

et al. 2023

JOM

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High-Efficiency Desulfurization of High-Sulfur Bauxite Calcined in a Conveyor Bed: Kinetics, Process, and Application

Cited by 6 publications

References 23 publications

Ultra‐Fast Recyclable and Value‐Added Desulfation Method for Spent Lead Paste via Dual Intensification Processes

Ultra‐Fast Recyclable and Value‐Added Desulfation Method for Spent Lead Paste via Dual Intensification Processes

Preparation of Calcined Kaolin by Efficient Decarburization of Coal-Series Kaolinite in a Suspended Bed Reactor

A Case Study of Producing Alumina from High-Sulfur Diasporic Bauxite: Sulfur-Containing Desilication Products and Pyrite in Red Mud

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