为提高硼的去除率，研究了电磁感应精炼过程中硼杂质在 CaO?SiO2?BaO?CaF2四元渣和熔硅之间的分配系数 LB，讨论了四元渣系中 CaO/SiO2质量比、BaO 和 CaF2含量、熔炼时间对 LB 的影响规律。结果表明：随着 CaO?SiO2渣中 BaO 和 CaF2含量的增大，LB 值增大。当 CaO/SiO2质量比为1.1：1、BaO 和 CaF2含量分别为15%和20%时，CaO?SiO2?BaO?CaF2四元渣去除熔硅中硼杂质效果最好，LB 达到最大值6.94，并且 LB 随着熔炼时间的延长而增大。经过两次造渣后，熔硅中硼含量由3.5×10?5降到3.7×10?6，硼的去除率达到89.4%。
The distribution coefficient (LB) of boron between CaO?SiO2?BaO?CaF2 slag and silicon was investigated using electromagnetic induction melting for the purpose of improving the boron removal fraction. The dependence of the boron distribution coefficient between slag and silicon on the fundamental parameters of CaO to SiO2 mass ratio and refining time and the additions of BaO and CaF2 to the slag was discussed. The results show that LB can be increased by adding BaO and CaF2 to CaO?SiO2 slag. The maximum value of LB (6.94) is obtained when the CaO to SiO2 mass ratio is 1.1:1 and the contents of BaO and CaF2 are fixed at 15% and 20%, respectively. Increasing the refining time increases the LB. After the slag treatment is performed twice, the boron content of the silicon is successfully reduced from 3.5×10?5 to 3.7×10?6, and the removal fraction of boron reaches 89.4%.
参考文献
| [1] | Naomichi Nakamura;Hiroyuki Baba;Yasuhiko Sakaguchi.Boron Removal in Molten Silicon by a Steam-Added Plasma Melting Method[J].Materials transactions,20043(3):858-864. |
| [2] | MA Martorano;J.B. Ferreira Neto;T.S. Oliveira.Refining of metallurgical silicon by directional solidification[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,20113(3):217-226. |
| [3] | Song-Sheng Zheng;Thorvald Abel Engh;Merete Tangstad.Separation of Phosphorus from silicon by induction vacuum refining[J].Separation and Purification Technology,2011:128-137. |
| [4] | K. Morita;T. Miki.Thermodynamics of solar-grade-silicon refining[J].Intermetallics,200311/12(11/12):1111-1117. |
| [5] | 蔡靖;李锦堂;陈文辉;陈朝;罗学涛.采用CaO-SiO2-CaF2渣系去除硅中杂质硼[J].中国有色金属学报（英文版）,2011(6):1402-1406. |
| [6] | 伍继君;李彦龙;马文会;魏奎先;杨斌;戴永年.CaO-SiO2熔渣精炼去除冶金级硅中杂质硼[J].中国有色金属学报（英文版）,2014(4):1231-1236. |
| [7] | Leandro Augusto Viana TEIXEIRA;Yomei TOKUDA;Toshinobu YOKO;Kazuki MORITA.Behavior and state of boron in CaO-SiO_2 slags during refining of solar grade silicon[J].ISIJ International,20096(6):777-782. |
| [8] | Leandro Augusto Viana TEIXEIRA;Kazuki MORITA.Removal of Boron from Molten Silicon Using CaO-SiO_2 Based Slags[J].ISIJ International,20096(6):783-787. |
| [9] | Johnston, M.D.;Barati, M..Effect of slag basicity and oxygen potential on the distribution of boron and phosphorus between slag and silicon[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,20113(3):970-975. |
| [10] | Johnston, M.D.;Barati, M..Distribution of impurity elements in slagsilicon equilibria for oxidative refining of metallurgical silicon for solar cell applications[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,201012(12):2085-2090. |
| [11] | 罗大伟;刘宁;卢一平;张国良;李廷举.应用电磁感应造渣法去除冶金级硅中杂质硼[J].中国有色金属学报（英文版）,2011(5):1178-1184. |
| [12] | LI Gui-rong.Effect of Strong Basic Oxide (Li2O, Na2O, K2O and BaO) on Property of CaO-Based Flux[J].钢铁研究学报(英文版),2003(03):6-9. |
| [13] | Osamu TAKEDA;Taku OKAWARA;Yuzuru SATO.Development of a New Viscometer Based on Rotating Crucible Method and Viscosity Measurement of SiO_2-CaO-CaF_2 System[J].ISIJ International,20129(9):1544-1549. |
| [14] | Zhang, L.;Tan, Y.;Li, J.;Liu, Y.;Wang, D..Study of boron removal from molten silicon by slag refining under atmosphere[J].Materials science in semiconductor processing,20136(6):1645-1649. |
| [15] | Heo, Jung Ho;Chung, Yongsug;Park, Joo Hyun.Effect of CaF2 Addition on the Silicothermic Reduction of MnO in Ferromanganese Slag[J].Metallurgical and Materials Transactions, B. Process metallurgy and materials processing science,20153(3):1154-1161. |
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