Effects of La2O3 Addition into CaO-SiO2 Slag: Structural Evolution and Impurity Separation from Si-Sn Alloy
نویسندگان
چکیده
Abstract Boron (B) and phosphorus (P) are the most problematic impurities to be removed in production of solar-grade silicon by metallurgical process. In this work, distribution B P between CaO-(La 2 O 3 )-SiO slags Si-10 mass pct Sn melt was experimentally studied. coefficient increased from 2.93 binary CaO-SiO slag 3.33 3.65 with 10 La additions, respectively. followed acid-leaching experiments, slag-treated Si-Sn alloys exhibited higher removal than that initial alloy without treatment. Molecular dynamics simulations were performed study effect addition on structural transport properties. A novel oxygen classification method proposed distinguish different roles Ca CaO-La -SiO system. It found 3+ prefers stay depolymerized region, mostly connects 6-7 non-bridging oxygen, requires a weak charge compensation 2+ . Possible silicothermic reduction evaluated discuss chemistry transfer metal phase. thermodynamic model derived theoretically alloying impurity refining where positive interaction high concentration beneficial improve removal.
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ژورنال
عنوان ژورنال: Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
سال: 2021
ISSN: ['1543-1916', '1073-5615']
DOI: https://doi.org/10.1007/s11663-021-02232-4