Journal
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
Volume 19, Issue 1, Pages 299-311Publisher
WILEY
DOI: 10.1111/ijac.13898
Keywords
carbothermic reduction; Fe additive; SiC synthesis; silicon cutting waste
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Funding
- National Key Research and Development Program of China [2018YFC1901804, 2018YFC1901805]
- National Natural Science Foundation of China [21978045, U1902219]
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Fe-containing additives, especially Fe(NO3)(3), have been found to have a significant impact on recycling silicon cutting waste (SCW) to synthesize high-purity SiC. Fe(NO3)(3) can effectively reduce the activation energy for reactions and promote material transport, dissolution, and precipitation due to the formation of FeSi melt at low temperatures. Optimal processing conditions include 1-3 wt.% Fe(NO3)(3) addition and a smelting temperature of 1200-1300 degrees Celsius.
With the rapid development of the photovoltaic industry, a great amount of silicon cutting waste (SCW) are being generated, which lead to a heavy environmental burden as well as a high cost of the photovoltaic industry. In this paper, the effects of Fe-containing additives and their function mechanism on recycling SCW to synthesize high-purity SiC were studied. The results show that Fe-containing additives, including Fe, Fe2O3, and Fe(NO3)(3), have obvious effect on recycling SCW to synthesize SiC. And Fe(NO3)(3) additive achieves the best effect. Fe(NO3)(3) can effectively destroy the SiO2 film wrapped on the Si particles, so that expose the inner Si to C at lower temperatures than that of the reaction between C and SiO2. Besides, Fe(NO3)(3) additive can effectively reduce the activation energy both for Si and C reactions and SiO2 and C reactions, and contribute to the transport of the raw materials as well as the dissolution and precipitation of Si and C due to the formation of the FeSi melt at low temperatures. The optimal processing conditions are determined as Fe(NO3)(3) addition of 1-3 wt.% and smelting temperature of 1200-1300celcius.
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