Influence of carbothermic reduction on submerged arc furnace energy efficiency during silicon production

Chen, Zhengjie; Ma, Wenhui; Wu, Jijun; Wei, Kuixian; Yang, Xi; Lv, Guoqiang; Xie, Ke; Yu, Jianguo

doi:10.1016/j.energy.2016.09.034

Cited by 38 publications

(13 citation statements)

References 26 publications

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“…Due to the high partial pressure of oxygen at the initial stage and the high activity of O 2 , a small amount of O 2 in N 2 will rst participate in the reaction and react with SiO(g) and internal Si to form SiO 2 , as shown in Eq. (2,3). As the partial pressure of oxygen gradually decreased, Si 2 N 2 O began to form through the Eq.…”

Section: Analysis Of Ni Accelerated Nitridation Mechanismmentioning

confidence: 99%

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Recycling of the Diamond-wire Saw Powder by Ni-catalyzed Nitridation to Prepare Si3N4

Jin

Zhou

et al. 2021

Silicon

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In this paper, the acceleration of nickel (Ni) in the direct nitridation process of the diamond-wire saw powder (DWSP) was investigated. The DWSP doped with Ni additives were nitrided at different temperatures. To study the mechanism of accelerated nitridation, the thermodynamics of Si-O-N-Ni was analyzed by FactSage 7.2 and single-crystal silicon blocks were also nitrided instead of the DWSP. The results revealed that Ni decreased the nitridation temperature at which the DWSP began to gain signi cant weight and exhibited an excellent accelerating effect on the nitridation of the DWSP. At 1300℃, the DWSP containing 2.0 wt.% Ni additives had been completely nitrided within 2 h, whereas the DWSP without Ni additives had not been nitrided yet. Based on the equivalent substitution experiment, it could be conducted that the presence of Ni additives accelerated the nitridation and promoted the formation of the α-Si 3 N 4 nanorods through facilitating the generation of the SiO(g) and destructing the silica lm on the surface of silicon at lower temperature. Meanwhile, Ni additives also played an important part in the growth of α-Si 3 N 4 nanorods by forming liquid Ni-Si alloy in the product.

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Section: Analysis Of Ni Accelerated Nitridation Mechanismmentioning

confidence: 99%

“…Recently, the global energy crisis and environmental problems are becoming increasingly serious, due to the rapid growth of fossil energy consumption (Chen et al, 2016). So, it is imperative to nd a new type of renewable energy, in which solar energy is emerging and promising (Liu et al, 2019b;Wu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Recycling of the Diamond-wire Saw Powder by Ni-catalyzed Nitridation to Prepare Si3N4

Jin

Zhou

et al. 2021

Silicon

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“…Over 90 % of today`s photovoltaic cells still use silicon as conversion material. The reason is its abundance (Si constitutes 27 mass % of earth's crust), non−toxicity, acceptable band gap and reasonable energy conversion efficiency (around 20 %) [1][2][3]. One of the current hurdles against solar energy becoming a major contributor to the energy basket is still its high cost.…”

Section: Introductionmentioning

confidence: 99%

Structural correlations and chemistry of the Na3AlF6 − SiO2 melt as an electrolyte for the solar grade silicon (SOG − Si) electrowinning

Šimko

Rakhmatullin

Korenko

et al. 2021

Journal of Molecular Liquids

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Molten system Na 3 AlF 6 −SiO 2 was examined by high temperature NMR. Further characterizations of the samples prepared by Rapid Solidification Processing (RSP) technique and by spontaneous solidification were performed by X-ray diffraction and solid state NMR. The high solubility of SiO 2 in molten cryolite and the immiscibility phenomenon were observed. Using thermogravimetric analysis, weight losses were detected, which could be attributed to the formation of the volatile products. The results of the present study are the evidence that SiO 2 reacts with molten Na 3 AlF 6 under the formation of the volatile SiF 4 , non−volatile NaF, and alumino−silicate AlSi 3 O 8 species. NMR spectroscopy coupled with diffraction−based methods was proved as a promising approach to obtain information about the structure and chemistry of this rather complex system.

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“…In previous studies, we determined the correlation coefficients between the different raw material consumption and exergetic efficiency via linear regression on industrial silicon production in the furnace [25,26]. We used several artificial neural network (ANN) models to simulate and evaluate the approximate composition fluctuations of carbon materials and the final power strain and combustion efficiency under different petroleum coke, soft coal, silica and electrode [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbonaceous Reducers on Carbon Emission during Silicon Production in SAF of 8.5 MVA and 12.5 MVA

Jiang

Chen

et al. 2021

Silicon

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The silicon manufacturing process produces a large amount of carbon emissions, which is of deep concern to the Chinese government. Previous research has calculated the amount of carbon emissions incurred in silicon production, while research on the factors that affect carbon emissions during the silicon production process has been scarce. The effect of the carbonaceous reducers' consumption on the carbon emission during silicon production was investigated using statistical analysis of the actual production data in order to lower the carbon emissions of silicon production. The effect of different type furnaces (8.5MVA and 12.5MVA) on the carbon emission were also investigated in the study. Based on the results, the soft coal has the greatest impact on carbon emissions when using the 8.5MVA submerged arc furnace. When using the 12.5MVA furnace, petroleum coke has the greatest impact on carbon emission. The use of the 12.5MVA furnace reduces the carbon dioxide emissions of the production of one ton of silicon by approximately 74 kg compared to the 8.5MVA furnace. To obtained reduced carbon emissions in silicon production, we suggest that the silicon manufacturers should (1) use the 12.5MVA submerged arc furnace as much as possible; (2) and optimize the ratio of carbonaceous reducing agents in raw materials for the different furnace types.

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Influence of carbothermic reduction on submerged arc furnace energy efficiency during silicon production

Cited by 38 publications

References 26 publications

Recycling of the Diamond-wire Saw Powder by Ni-catalyzed Nitridation to Prepare Si3N4

Recycling of the Diamond-wire Saw Powder by Ni-catalyzed Nitridation to Prepare Si3N4

Structural correlations and chemistry of the Na3AlF6 − SiO2 melt as an electrolyte for the solar grade silicon (SOG − Si) electrowinning

Effect of Carbonaceous Reducers on Carbon Emission during Silicon Production in SAF of 8.5 MVA and 12.5 MVA

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Influence of carbothermic reduction on submerged arc furnace energy efficiency during silicon production

Cited by 38 publications

References 26 publications

Recycling of the Diamond-wire Saw Powder by Ni-catalyzed Nitridation to Prepare Si3N4

Recycling of the Diamond-wire Saw Powder by Ni-catalyzed Nitridation to Prepare Si3N4

Structural correlations and chemistry of the Na3AlF6 − SiO2 melt as an electrolyte for the solar grade silicon (SOG − Si) electrowinning

Effect of Carbonaceous Reducers on Carbon Emission during Silicon Production in SAF of 8.5 MVA and 12.5 MVA

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Structural correlations and chemistry of the Na3AlF6 − SiO2 melt as an electrolyte for the solar grade silicon (SOG − Si) electrowinning