Efficient recycling of silicon cutting waste for producing high-quality Si-Fe alloys.
Environ Sci Pollut Res Int
; 30(22): 62355-62366, 2023 May.
Article
in En
| MEDLINE
| ID: mdl-36940036
ABSTRACT
A tremendous amount of silicon cutting waste (SCW) is being produced during slicing Si ingots, which leads to a great waste of resources and serious environmental pollution. In this study, a novel method that recycling SCW to produce Si-Fe alloys was proposed, which not only provides a process with low energy consumption, low cost, and short flow for producing high-quality Si-Fe alloys but also achieves a more effective recycling of SCW. The optimal experimental condition is investigated to be a smelting temperature of 1800 °C and a holding time of 10 min. Under this condition, the yield of Si-Fe alloys and the Si recovery ratio of SCW were 88.63% and 87.81%, respectively. Compared with the present industrial recycling method that uses SCW to prepare metallurgy-grade Si ingot by an induction smelting process, this Si-Fe alloying method can achieve a higher Si recovery ratio of SCW at a shorter smelting time. The promoting mechanism of Si recovery by Si-Fe alloying is mainly expressed as follows (1) facilitating the separation of Si from SiO2-based slag; (2) reducing the oxidization and carbonization loss of Si by accelerating the heating of raw materials and reducing the exposed area of Si.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Silicon
/
Alloys
Language:
En
Journal:
Environ Sci Pollut Res Int
Journal subject:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Year:
2023
Document type:
Article