Carbothermic Reduction of Silica (Studies on the production of Crude Aluminium Alloy by the Direct Reduction of Aluminous Ores)

Kikuchi, Takeaki; Kurosawa, Toshio; Yagihashi, Tetsuo

doi:10.2320/jinstmet1952.32.9_866

Cited by 7 publications

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“…2 The schematic gures of the crucible design, shape and material difference between the original setup, the primary (setup A), the improved one (B1) and the actual used (setup B2). of solid silica and carbon 11,12) . In our system, the partial pressure ratio of SiO and CO gasses was between 0.01 to 0.1 with a total pressure P T = P SiO + P CO from 0.032 to 0.056 atm, the temperature across the ratio and the total pressure is shown as a dashed line in Fig.…”

Section: Process and Methodsmentioning

confidence: 99%

Development of Real-Time Weight Monitoring System for the Carbothermic Reduction Process of Silica

et al. 2016

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For many years the production of solar-grade silicon remained a costly process resulting in a large amount of carbon gas being emitted, and so the process still requires improvement to suppress carbon emission. The starting point of the processes is to produce raw silicon materials from a natural resource via mostly carbothermic reduction. However, this process is very complicated and SiO and SiC form as by-products. Further improvement of the carbothermic reduction process requires an understanding in real time of the reactions occurring and the weight change during heating. In particular, the behavior of the SiO by-product plays a major role in the production of silicon because the loss of Si is caused by the escape of SiO gas. In this study, we developed an in-situ weight measuring system for our induction heating furnace, and successfully suppressed much of the error in weight by improving the crucible con guration. The real-time monitoring of the crucible weight loss during the reaction may assist in understanding of the carbothermic reduction process in a more detailed fashion.

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Section: Process and Methodsmentioning

confidence: 99%

Development of Real-Time Weight Monitoring System for the Carbothermic Reduction Process of Silica

et al. 2016

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“…Several mechanisms have been defined for the production of silicon carbide (SiC) using the reaction of silica (SiO 2 ) and carbon (C) at high temperatures. 1–9 Among these mechanisms, some cases have been widely accepted in the temperature range of 1500 to 2000 K. 7–9 Nevertheless, attending to the complexity of this reaction, there is no complete investigation for obtaining this mechanism, based on the thermodynamic and kinematic of this reaction.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of reaction of silica and carbon for producing silicon carbide

Abolpour

Shamsoddini

2019

Progress in Reaction Kinetics and Mechanism

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The reaction kinetics of carbon reduction of silica were investigated using thermodynamic concepts and by fitting to relevant models the experimental data obtained for this reduction using a thermogravimetric unit in the temperature range of 1566 to 1933 K. The results show that the only way to produce SiC in this reduction is the reaction of Si, SiO, or SiO2 at the surface or by diffusion of SiO inside the carbon particles while CO and CO2 have no direct effect on the process. The controlling step of this reduction at temperatures lower than 1750 K is the chemical gas–solid or solid–solid reaction at the surface of the carbon particles, while at higher temperatures, the rate of SiO diffusing inside the carbon particles controls the rate of this reduction.

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Chen¹,

Lin²

1997

Journal of Materials Science Letters

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Carbothermic Reduction of Silica (Studies on the production of Crude Aluminium Alloy by the Direct Reduction of Aluminous Ores)

Cited by 7 publications

References 0 publications

Development of Real-Time Weight Monitoring System for the Carbothermic Reduction Process of Silica

Development of Real-Time Weight Monitoring System for the Carbothermic Reduction Process of Silica

Mechanism of reaction of silica and carbon for producing silicon carbide

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