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| Innovative separation model for boron removal from silicon during slag refining based on ion and molecule coexistence theory | |
| Li, Shijian1,2; Qian, Guoyu1,3; Sun, Yiwei1,3; Pang, Sheng1,3; Wang, Dong1,2,3; Wang, Zhi1,2,3 | |
| 2022-06-01 | |
| Source Publication | METALLURGICAL RESEARCH & TECHNOLOGY
 |
| ISSN | 2271-3646 |
| Volume | 119Issue:3Pages:12 |
| Abstract | How to reduce boron concentration to an extremely low level has become a major obstacle during silicon waste recycling. As a simple and efficient method of removing impurities, slag refining plays an increasingly important role for industrial silicon waste recovery. The deboration ability of slag is usually evaluated by boron distribution ratio L-B. However, the development of a separation prediction model is challenged by the limitations on the recognition of impurity structure in slag and complexity of slag-silicon reactions. Herein, a novel thermodynamic model for predicting boron distribution ratio between CaO-SiO2 based slags and molten silicon has been developed based on ion and molecule coexistence theory (IMCT), i.e., IMCT-L-B model. The reaction abilities of structural units are represented by the calculated mass action concentration. The predictive boron distribution ratio between CaO-SiO2, CaO-Al2O3-SiO2, CaF2-CaO-SiO2 slags and silicon correspond well with experimental data, reflecting the reasonability of IMCT-L-B model. According to IMCT, deboration reactions between slags and silicon can be represented by ion couples (Ca2+ + O2-), simple molecule Al2O3 with SiO2 to form eight deboration products as B2O3, 3CaO center dot B2O3, 2CaO center dot B2O3, CaO center dot B2O3, CaO center dot 2B(2)O(3), 2Al(2)O(3 )center dot B2O3, 9Al(2)O(3 )center dot B2O3, CaO center dot 2SiO(2 )center dot B2O3. With the developed IMCT-L-B model, the respective boron distribution ratio L-B,(i) of the eight deboration products can be determined quantitatively. Furthermore, the effect of temperature, mass ratio of CaO to SiO2 (%CaO/%SiO2), Al2O3 and CaF2 content of CaO-SiO2 based slags on L-B are fully discussed. |
| Keyword | silicon waste recycling slag refining thermodynamic distribution model ion and molecule coexistence theory boron distribution ratio |
| DOI | 10.1051/metal/2022024 |
| Language | 英语 |
| WOS Keyword | METALLURGICAL SILICON ; THERMODYNAMIC MODEL ; GRADE-SILICON ; PHOSPHORUS ; CAO-SIO2 ; BEHAVIOR |
| Funding Project | National Natural Science Foundation of China[51934006] ; National Natural Science Foundation of China[U1902219] |
| WOS Research Area | Metallurgy & Metallurgical Engineering |
| WOS Subject | Metallurgy & Metallurgical Engineering |
| Funding Organization | National Natural Science Foundation of China |
| WOS ID | WOS:000804251700001 |
| Publisher | EDP SCIENCES S A |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/53679 |
| Collection | 中国科学院过程工程研究所 |
| Corresponding Author | Qian, Guoyu; Wang, Dong; Wang, Zhi |
| Affiliation | 1.Chinese Acad Sci, Natl Engn Res Ctr Green Recycling Strateg Met Res, Inst Proc Engn, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341119, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Li, Shijian,Qian, Guoyu,Sun, Yiwei,et al. Innovative separation model for boron removal from silicon during slag refining based on ion and molecule coexistence theory[J]. METALLURGICAL RESEARCH & TECHNOLOGY,2022,119(3):12. |
| APA | Li, Shijian,Qian, Guoyu,Sun, Yiwei,Pang, Sheng,Wang, Dong,&Wang, Zhi.(2022).Innovative separation model for boron removal from silicon during slag refining based on ion and molecule coexistence theory.METALLURGICAL RESEARCH & TECHNOLOGY,119(3),12. |
| MLA | Li, Shijian,et al."Innovative separation model for boron removal from silicon during slag refining based on ion and molecule coexistence theory".METALLURGICAL RESEARCH & TECHNOLOGY 119.3(2022):12. |
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