Efficient recycling of silicon cutting waste by Al-Si alloying with the assistance of cryolite

被引：11

作者：

Wei, Donghui ^{[1
]}

Kong, Jian ^{[1
]}

Lyu, Jingyi ^{[1
]}

Zhuang, Yanxin ^{[2
]}

Xing, Pengfei ^{[1
]}

机构：

[1] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China

[2] Northeastern Univ, Minist Educ, Key Lab Electromagnet Proc Mat, Shenyang 110819, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2022年 / 816卷

基金：

中国国家自然科学基金;

关键词：

Silicon cutting waste; Diamond wire sawing; Recycle; Al-Si alloy; Cryolite; DIAMOND-WIRE SAW; KERF-LOSS; NANOPARTICLES; RECOVERY;

D O I：

10.1016/j.scitotenv.2021.151580

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Silicon cutting waste (SCW) generated during Si wafers producing process can be recycled by Al-Si alloying process. However, the presence of O in SCW has a detrimental impact on recycling process. In this study, cryolite was introduced to eliminate the hindrance of O. The influences of smelting temperature and the amount of cryolite additive on the yield of the blocky Al-Si alloys and the Si recovery ratio of the SCW have been investigated and the alloying conditions were optimized to a smelting temperature of 1000 degrees C and a cryolite/SCW mass ratio of 0.8, achieving a Al-Si alloys yield of 95.99% and a Si recovery ratio of 84.77%, which were far greater than those without cryolite additive. The results showed that the addition of cryolite additive can effectively improve the smelting effect and reduce the alloying temperature. Furthermore, the action mechanism of cryolite in Al-SCW system was analyzed, and the results revealed that the molten cryolite can dissolve the generated Al2O3 existing on the surface of Al\\Si alloy droplets and finally contributes to the aggregation of these droplets. This method has advantages including high Si recovery ratio of SCW, low alloying temperature and simple technological process. (C) 2021 Elsevier B.V. All rights reserved.

引用

页数：9

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