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Indexed by:Journal Papers

Date of Publication:2020-09-15

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE

Volume:835

ISSN No.:0925-8388

Key Words:Silicon; SiC; Separation; Electromagnetic induction melting; Al addition

Abstract:The recycling of Si scraps has become a serious concern in the industry because of the increasing amount of Si waste generated during ingot production. In this work, an operative method is proposed to process Si scraps and separate SiC from Si by coupling electromagnetic field melting with Al/SiC wetting and interaction. This method yields an inclusion-free SiC particle-enriched region that tends to migrate to the top of ingots with increasing melting time. A micron-grade SiC-rich layer is formed at the ingot edge. A petal-shaped SiC particle group is formed by Al addition and precipitates at the bottom of the ingot. A separation efficiency of 88.1% is obtained after melting for 45 min. The results show that the proposed process is an effective way to eliminate SiC from recycled Si scrap. (C) 2020 Elsevier B.V. All rights reserved.