Thermodynamic analysis and experimental verification for silicon recovery from the diamond wire saw silicon powder by vacuum carbothermal reduction

Yang, Shicong; Ma, Wenhui; Wei, Kuixian; Xie, Ke; Wang, Zhi

doi:10.1016/j.seppur.2019.115754

Cited by 66 publications

(14 citation statements)

References 40 publications

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“…According to the TEM observations presented in Figure a,b, it is evident that the amorphous SiO 2 shell region covered the surfaces of irregular silicon particles, which is in good accordance with the authors’ previous observations. , To further confirm that the retained impurities were detained in the SiO 2 shell, TEM-EDS spectroscopy analysis was conducted, and the results are presented in Figure c. The results demonstrate that a high content of Al impurities was detected on the amorphous SiO 2 shell layer, which means that a small amount of impurities was enriched in the amorphous SiO 2 shell.…”

Section: Resultsmentioning

confidence: 99%

“…It is evident that this topic has become a research hotspot and has garnered significant interest from researchers . The authors’ previous studies have investigated the kinetic mechanism of Al removal via HCl leaching, the dissolution and mineralization behavior of metal elements, and the Si core–SiO 2 shell structure . Moreover, the kinetic mechanism of iron removal with H 2 SO 4 leaching, multicomponent acid purification, the combined process of slag treatment and acid leaching, and acid leaching followed by induction furnace melting have also been investigated by other research groups.…”

Section: Introductionmentioning

confidence: 99%

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Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Yang

Wan

Wei

et al. 2020

ACS Sustainable Chem. Eng.

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The facilitation of metallic impurities removal via acid leaching pretreatment plays a key role in silicon recovery from diamond wire saw silicon powder (DWSSP) waste. Disappointingly, the occurrence state and dissolution mechanism of the metallic impurities present in DWSSP have not yet been revealed. For this reason, in this study, three different kinds of raw DWSSP were used for acid leaching tests and leaching behavior verification to investigate the dissolution mechanism. After two-stage acid leaching with 4 M HCl and 2 M HCl + 2.5 M HF, the results indicate that the removal efficiency was superior to that of other previously reported leaching processes. Furthermore, two occurrence states of metallic impurities present in DWSSP were defined based on their different dissolution behaviors, and the intrinsic relationship between dissolution behavior and the thinning process of the amorphous SiO2 shell was derived. The findings indicate that the first type of impurity was more easily dissolved in HCl solution; however, the second type of retained metallic impurity was restricted by the SiO2 shell barrier and was removed by the added HF solution. For this reason, the disintegration dissolution of the amorphous SiO2 shell was found to have a significant impact on the facilitation of the removal of impurities retained in DWSSP. The findings of this study are significant for the recovery of silicon from DWSSP with an effective acid leaching flow design.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Yang

Wan

Wei

et al. 2020

ACS Sustainable Chem. Eng.

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“…To solve the problems above mentioned, a lot of efforts on the recycle of high-purity silicon had been carried out (De Sousa et al, 2016;Kong et al, 2019;Lu et al, 2019;Tomono et al, 2013;Yang et al, 2019b). Although these studies had yielded remarkable results, there is still a long way to go for using as solar-grade feedstocks.…”

Section: Introductionmentioning

confidence: 99%

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

Jin

Zhou

et al. 2021

Preprint

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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 significant 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-Si3N4 nanorods through facilitating the generation of the SiO(g) and destructing the silica film on the surface of silicon at lower temperature. Meanwhile, Ni additives also played an important part in the growth of α-Si3N4 nanorods by forming liquid Ni-Si alloy in the product.

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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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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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Thermodynamic analysis and experimental verification for silicon recovery from the diamond wire saw silicon powder by vacuum carbothermal reduction

Cited by 66 publications

References 40 publications

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

Occurrence State and Dissolution Mechanism of Metallic Impurities in Diamond Wire Saw Silicon Powder

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

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