Purification of Metallurgical-Grade Silicon by Acid Leaching

Silicon ◽  
2018 ◽  
Vol 11 (4) ◽  
pp. 1979-1987 ◽  
Author(s):  
Farzad Ebrahimfar ◽  
Mahdi Ahmadian
Keyword(s):  
Acid Leaching ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon

Comparison between slag refining processes for B removal with metallurgical grade silicon and Si–Sn alloy

2018 ◽  
Vol 115 (3) ◽  
pp. 312 ◽  
Author(s):  
Rowaid Al-khazraji ◽  
Yaqiong Li ◽  
Lifeng Zhang
Keyword(s):  
Removal Efficiency ◽  
Acid Leaching ◽  
Experimental Results ◽  
Mass Ratio ◽  
Metallurgical Grade Silicon ◽  
Clear Effect ◽  
Slag Refining ◽  
Before And After ◽  
Grade Silicon ◽  
Refining Processes

Boron (B) removal by slag refining using CaO–SiO2–CaCl2 was investigated in metallurgical-grade silicon (MG-Si) and 75 wt% Si–Sn alloy. Experiments were conducted at 1500 °C for 15 min. The microstructure was characterized before and after refining. The effects of acid leaching, basicity, and slag/Si mass ratio on B removal were investigated. Experimental results showed that acid leaching had no effect on B removal from MG-Si but had a clear effect on the refined Si–Sn alloy after slag refining. The final B concentration was highly affected by the CaO/SiO2 mass ratio with minimum value, where the content of B was reduced from 18.36 ppmw to 5.5 ppmw at the CaO/SiO2 = 1.2 for MG-Si slag refining and from 18.36 ppmw to 3.7 ppmw at CaO/SiO2 = 1.5 for 75 wt% Si–Sn alloy. Increasing the slag mass ratio by 2:1 mass ratio also increased B removal efficiency by approximately 15–20% more than an increase by 1:1.

Purification of metallurgical-grade silicon via acid leaching, calcination and quenching before boron complexation

2013 ◽  
Vol 139 ◽  
pp. 64-72 ◽  
Author(s):  
Yan-Hui Sun ◽  
Qi-Hui Ye ◽  
Chang-Juan Guo ◽  
Hong-Yu Chen ◽  
Xu Lang ◽  
...  
Keyword(s):  
Acid Leaching ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon

Reductive Removal of Phosphorus in Silicon Using CaO-CaF2 Slag

2013 ◽  
Vol 750 ◽  
pp. 284-287 ◽  
Author(s):  
Hiroaki Kawamura ◽  
Yutaka Yanaba ◽  
Takeshi Yoshikawa ◽  
Kazuki Morita
Keyword(s):  
Acid Leaching ◽  
Calcium Content ◽  
Molten Silicon ◽  
Metallurgical Grade Silicon ◽  
Slag Treatment ◽  
High Fraction ◽  
Wet Chemical ◽  
Grade Silicon ◽  
Removal Fraction ◽  
P Removal

In order to verify an alternative metallurgical process of phosphorus removal for solar grade silicon (SOG-Si), slag treatment of metallurgical grade silicon (MG-Si) was conducted followed by acid leaching in the present study. MG-Si containing certain amount of phosphorus and calcium was equilibrated at 1723 and 1773 K with several compositions of the CaO-CaF2 slags and phosphorus in molten silicon was confirmed to be removed into slag phase also by reducing reaction as a form of phosphide ion, P3-, in addition to the phosphate ion, PO43-. These contents were separately determined by a wet chemical analysis method developed by ourselves. Although the distribution ratio of phosphorus could not exceed the highest reported values of 3, subsequent leaching brought about considerably high fraction of P removal. The removal fraction of 95.6% was attained when 5 g of silicon was treated with 10 g of the slag at 1773 K followed by the acid leaching, which would be much higher than that expected by the ordinary oxidizing slag treatment. Although the possibility of reducing dephosphorization by slag treatment was clarified, more effective condition should be pursued by changing slag composition, calcium content of silicon, temperature, etc.

Purification of metallurgical grade silicon by acid leaching

1990 ◽  
Vol 23 (2-3) ◽  
pp. 237-246 ◽  
Author(s):  
I.C Santos ◽  
A.P Gonçalves ◽  
C.Silva Santos ◽  
M Almeida ◽  
M.H Afonso ◽  
...  
Keyword(s):  
Acid Leaching ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon

Ca-Si Alloy Addition Followed by Acid Leaching as a Route to Solar-Grade Silicon

2014 ◽  
Vol 881-883 ◽  
pp. 1562-1567
Author(s):  
Peng Zou ◽  
Kui Xian Wei ◽  
Wen Hui Ma ◽  
Ke Qiang Xie ◽  
Ji Jun Wu ◽  
...  
Keyword(s):  
Phosphorus Content ◽  
Low Cost ◽  
Acid Leaching ◽  
Impurity Phase ◽  
Solar Grade Silicon ◽  
Metallurgical Grade Silicon ◽  
Before And After ◽  
Alloy Addition ◽  
Grade Silicon ◽  
Leaching Condition

In present, refining of metallurgical grade silicon is one of the promising routes to low-cost solar grade silicon for solar cells. Alloying with Ca has shown a great potential as efficient refining method of MG-Si in combination with acid leaching. Compared with Ca metal, Ca-Si alloy is cheaper and more secure. Great removal of impurity depends on microstructure of MG-Si after alloyed with Ca-Si alloy. In the work, the change of impurity phase which was performed by the change of the microstructure of MG-Si before and after alloyed with Ca-Si alloy has been analyzed. It was determined that CaSi2phase contained significant phosphorus content after alloying with Ca-Si alloy, It also investigated the optimal acid leaching condition after leaching, which confirmed that metallurgical grade silicon with Ca-Si alloy addition followed by acid leaching could be a potential route to remove phosphorus from MG-Si.

Microstructure of metallurgical grade silicon and its acid leaching behaviour by alloying with calcium

2013 ◽  
Vol 122 (4) ◽  
pp. 229-237 ◽  
Author(s):  
Yulia V. Meteleva-Fischer ◽  
Yongxiang Yang ◽  
Rob Boom ◽  
Bert Kraaijveld ◽  
Henk Kuntzel
Keyword(s):  
Acid Leaching ◽  
Metallurgical Grade Silicon ◽  
Leaching Behaviour ◽  
Grade Silicon

scholarly journals Pengaruh Waktu Pelindian pada Proses Pemurnian Silikon Tingkat Metalurgi Menggunakan Larutan HCl[Effect of Leaching Time on Purification Process of Metallurgical Grade Silicon by Using Acid Solution]

Metalurgi ◽  
2016 ◽  
Vol 27 (1) ◽  
pp. 1
Author(s):  
Bintang Adjiantoro ◽  
Efendi Mabruri
Keyword(s):  
Acid Solution ◽  
Extraction Efficiency ◽  
Acid Leaching ◽  
Purification Process ◽  
Metallurgical Grade Silicon ◽  
Mechanical Stirring ◽  
Metal Impurities ◽  
Grade Silicon ◽  
Impurity Elements ◽  
Leaching Efficiency

IntisariPENGARUH WAKTU PELINDIAN PADA PROSES PEMURNIAN SILIKON TINGKAT METALURGI MENGGUNAKAN LARUTAN HCl. Proses pemurnian silikon tingkat metalurgi (MG-Si)dengan menggunakan metoda pelindian asam pada konsentrasi 2,45mol/L HCl telah dilakukan dengan memvariasikan waktu pelindian pada temperatur didih (±100 °C) dan gerakan pengadukan mekanik. Hasil penelitian menunjukkan bahwa proses pelindian MG-Si dengan HCl dapat digunakan untuk menghilangkan unsur pengotor logam. Persentase hasil efisiensi ekstraksi dari unsur pengotor yang terkandung di dalam MG-Si dengan pelarutan HCl masing-masing mencapai 99,996 % untuk Al, 98,247 % untuk Ti dan 98,491 % untuk Fe pada waktu pelindian 120 jam. Sedangkan efisiensi larutan HCl terhadap unsur pengotor dengan gerakan pengadukan mekanik mencapai 99,04 %.Kata kunci : Silikon tingkat metalurgi, Pemurnian dengan proses kimia, Pelindian asam, PengotorAbstractEFFECT OF LEACHING TIME ON PURIFICATION PROCESS OF METALLURGICAL GRADE SILICON BY USING ACID SOLUTION. The purification process of metallurgical grade silicon (MG-Si) using acid leaching method at a concentration of 2.45 mol/L HCl was performed by varying the leaching time atboiling temperature ( ±100 °C) and with mechanical stirring. The results showed that the leaching process of MG-Si with HCl can be used to eliminate the element of metal impurities. The extraction efficiency of impurity elements contained in the MG-Si by HCl dissolution is 99.996 % for Al, 98.247 % for Ti and 98.491 % for Fe at leaching time of 120 hours. Whereas the leaching efficiency of HCl solution on the impurities using mechanical stirring is 99.04 %.Keywords : Metallurgical grade silicon, Chemical purification, Acid leaching, Impurities

scholarly journals Phosphorus removal from metallurgical grade silicon by acid leaching for solar application

2019 ◽  
Author(s):  
Cátia Fredericci ◽  
João Guilherme Rocha Poço ◽  
João Batista Ferreira Neto ◽  
John Bernardo Vilca Neira
Keyword(s):  
Phosphorus Removal ◽  
Acid Leaching ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon ◽  
Solar Application

Enhancement of boron removal from metallurgical-grade silicon by titanium addition during slag refining

2021 ◽  
Vol 118 (6) ◽  
pp. 612
Author(s):  
Yaqiong Li ◽  
Lifeng Zhang ◽  
Ligang Liu
Keyword(s):  
Acid Leaching ◽  
Boron Removal ◽  
Titanium Addition ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon ◽  
Ti Addition

The effects of titanium addition (0 wt.%, 0.2 wt.%, and 0.5 wt.%) on the boron removal from metallurgical-grade silicon during slag refining have been studied. According to the findings, the addition of Ti improved the removal of 92.5 wt.% B with 0.5 wt.% Ti addition compared to 79.4 wt.% B removal without Ti addition. Furthermore, acid leaching reduced excess Ti to 27 ppmw.

The Effect of Secondary Refining on the Removal of Phosphorus from Metallurgical-Grade Silicon by Acid Leaching

2017 ◽  
Vol 48 (5) ◽  
pp. 2768-2780 ◽  
Author(s):  
Haifei Lu ◽  
Kuixian Wei ◽  
Wenhui Ma ◽  
Keqiang Xie ◽  
Jijun Wu ◽  
...  
Keyword(s):  
Acid Leaching ◽  
Metallurgical Grade Silicon ◽  
Secondary Refining ◽  
Grade Silicon
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