Evaporation Behavior of Phosphorus from Metallurgical Grade Silicon via Calcium-Based Slag Treatment and Hydrochloric Acid Leaching

2015 ◽  
Vol 45 (1) ◽  
pp. 541-552 ◽  
Author(s):  
Liuqing Huang ◽  
Huixian Lai ◽  
Chenghao Lu ◽  
Ming Fang ◽  
Wenhui Ma ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Metallurgical Grade Silicon ◽  
Slag Treatment ◽  
Hydrochloric Acid Leaching ◽  
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.

Hydrochloric acid leaching behaviour of mechanically activated Panxi ilmenite (FeTiO3)

2010 ◽  
Vol 73 (2) ◽  
pp. 173-178 ◽  
Author(s):  
Li Zhang ◽  
Huiping Hu ◽  
Liangping Wei ◽  
Qiyuan Chen ◽  
Jun Tan
Keyword(s):  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Hydrochloric Acid Leaching ◽  
Leaching Behaviour

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.

Aqueous stability of rare earth and thorium elements during hydrochloric acid leaching of roasted bastnaesite

2017 ◽  
Vol 35 (12) ◽  
pp. 1255-1260 ◽  
Author(s):  
Genghong Shuai ◽  
Longsheng Zhao ◽  
Liangshi Wang ◽  
Zhiqi Long ◽  
Dali Cui
Keyword(s):  
Rare Earth ◽  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Hydrochloric Acid Leaching

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

scholarly journals Slag Treatment Followed by Acid Leaching as a Route to Solar-Grade Silicon

JOM ◽  
2012 ◽  
Vol 64 (8) ◽  
pp. 957-967 ◽  
Author(s):  
Yulia V. Meteleva-Fischer ◽  
Yongxiang Yang ◽  
Rob Boom ◽  
Bert Kraaijveld ◽  
Henk Kuntzel
Keyword(s):  
Acid Leaching ◽  
Solar Grade Silicon ◽  
Slag Treatment ◽  
Grade Silicon
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