Metal Impurities Removal from Metallurgical Grade Silicon by Hydrochloric Acid Leaching

2013 ◽  
Vol 813 ◽  
pp. 7-10 ◽  
Author(s):  
Xiao Ming Li ◽  
Yan Mei Dang ◽  
Wen Feng Li ◽  
Jun Xue Zhao ◽  
Ya Ru Cui
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Mass Fraction ◽  
Acid Leaching ◽  
Silicon Powder ◽  
Metallurgical Grade Silicon ◽  
Mechanical Stirring ◽  
Grade Silicon ◽  
Impurities Removal ◽  
Hydrometallurgical Method

As a pre-treatment process for producing solar-grade silicon, hydrometallurgical method could remove the most of metallic impurities of metallurgical-grade silicon, which is a hopeful technology to provide solar energy material independence of the Siemens skill. Factors such as the hydrochloric mass fraction, temperature, reaction time, and particle size of silicon powders were investigated in the impurities removal experiments under the condition of mechanical stirring. The leached samples were analyzed by ICP and SEM. The optimum parameters, hydrochloric mass fraction 5%, temperature 80°C, reaction time 9h, particle size 75μm, were determined by single factor experiments and orthogonal experiments. The 86.1% of Fe, 68.1% of Al, 85.9% of Ca and 25.9% of B impurity was removed from metallurgical-grade silicon powder.

Removal of Iron from Metallurgical Grade Silicon with Pressure Leaching

2011 ◽  
Vol 675-677 ◽  
pp. 873-876 ◽  
Author(s):  
Ke Qiang Xie ◽  
Zhan Liang Yu ◽  
Wen Hui Ma ◽  
Yang Zhou ◽  
Yong Nian Dai
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Removal Efficiency ◽  
Acid Concentration ◽  
Operating Conditions ◽  
Raw Material ◽  
Optimum Operating ◽  
Pressure Leaching ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon

In this paper, removal of iron from metallurgical grade silicon with pressure leaching is carried out. We investigated the factors such as the concentration of hydrochloric, particle size of raw material ground, temperature, pressure and reaction time, which influenced on the removal of iron. The results show that the optimum operating conditions for pressure leaching in hydrochloride are: acid concentration 4 mol/L, diameter for raw material less than 50 μm, leaching temperature 160 0C，leaching pressure 2.0 MPa, leaching time 2.0 h. The content of iron residual in MG-Si powder was reduced to about 200 ppmw. The removal efficiency of iron is up to 90.90 %.

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

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 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

Impurities Removal From Metallurgical Grade Silicon Using Gas Blowing Refining Techniques

Silicon ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Jijun Wu ◽  
Yanlong Li ◽  
Wenhui Ma ◽  
Kai Liu ◽  
Kuixian Wei ◽  
...  
Keyword(s):  
Metallurgical Grade Silicon ◽  
Grade Silicon ◽  
Impurities Removal ◽  
Gas Blowing

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

Electrolysis Process for Preparation of Solar Grade Silicon

2011 ◽  
Vol 391-392 ◽  
pp. 697-702 ◽  
Author(s):  
Xiang Yu Zou ◽  
Hong Wei Xie ◽  
Yu Chun Zhai ◽  
Xiao Chuan Lang ◽  
Jun Zhang
Keyword(s):  
Electrochemical Method ◽  
Silicon Powder ◽  
Argon Atmosphere ◽  
Impurity Level ◽  
Solar Grade Silicon ◽  
Metallurgical Grade Silicon ◽  
Pure Silicon ◽  
Cell Components ◽  
Nickel Crucible ◽  
Grade Silicon

Studied on electrorefining metallurgical grade silicon to prepare solar grade silicon(SOG-Si) with electrochemical method in molten KCl and NaF mixture salt. Molten KCl and NaF mixture salt as electrolyte, the metallurgical grade silicon as anode and little metal nickel crucible for collecting silicon powder as cathode, electrorefining experiments were performed at 800 and 2.0V for 14h under dry argon atmosphere. The results showed that the metallurgical grade silicon could be dissolved and deposited on the cathode through molten potassium chloride (KCl) and sodium fluoride (NaF) mixture salt electrolyte. The nickel crucible was full of deposit, which was pure silicon by XRD and EDS. Purity of refined silicon was close to 99.99%, most of impurities like B and P were reduced significantly. Impurity level of silicon was reduced to the desired range for SOG-Si by advancement of the materials for the cell components.

Distribution of Representative Impurities in Metallurgical-Grade Silicon Using CaO-SiO2-CaF2 and CaO-SiO2-CaCl2 Slags

2013 ◽  
Vol 813 ◽  
pp. 11-15
Author(s):  
Liu Qing Huang ◽  
Hui Xian Lai ◽  
Cheng Hao Lu ◽  
Ming Fang ◽  
Juan Chen ◽  
...  
Keyword(s):  
Detailed Analysis ◽  
Intermetallic Compounds ◽  
Removal Efficiency ◽  
Precipitate Phase ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon ◽  
Impurities Removal ◽  
Metallic Impurities

This paper presents a detailed analysis of impurities distribution in metallurgical-grade silicon after CaO-SiO2-CaF2 and CaO-SiO2-CaCl2 slags refining. It demonstrates that the impurities removal efficiency generally increase in metallurgical-grade silicon after CaO-SiO2-CaCl2 slag refining compared to that after CaO-SiO2-CaF2 slag refining. It is also determined that metallic impurities like Fe, Al and Ca tend to co-deposit with Si to form Si-Ca based intermetallic compounds in the precipitate phase after slag refining.

Sign in / Sign up

Export Citation Format

Share Document