Refining of Metallurgical Grade Silicon by Acid Leaching

2010 ◽  
Vol 156-157 ◽  
pp. 566-569 ◽  
Author(s):  
Dong Liang Lu ◽  
Yu Yan Hu ◽  
Tao Lin ◽  
Yu Liu ◽  
Bo Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
Emission Spectroscopy ◽  
Acid Leaching ◽  
Atomic Emission ◽  
Solar Grade Silicon ◽  
Plasma Atomic Emission ◽  
Metallurgical Grade Silicon ◽  
Photovoltaic Applications ◽  
Orthogonal Methods ◽  
Grade Silicon

Solar grade silicon (SoG-Si) is the key material for photovoltaic applications. In this study, the silicon grain size, concentration of HF, leaching time and leaching temperature were investigated by orthogonal methods. The results showed that the silicon grain size is the most important factor for the purification of silicon. Furthermore, the obvious removal efficiency of iron and aluminum was observed when the mannitol used as the chelated reagent in HF leaching process. Inductive coupled plasma atomic emission spectroscopy (ICP-AES) results indicated that the purity of the samples improved to a large extent with the chelated reagent.

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.

Research on Removal of Boron from Metallurgical Grade Silicon by Si-Al Alloying

2010 ◽  
Vol 156-157 ◽  
pp. 1037-1040
Author(s):  
Yu Liu ◽  
Dong Liang Lu ◽  
Yu Yan Hu ◽  
Tao Lin ◽  
Yan Hui Sun ◽  
...  
Keyword(s):  
Removal Rate ◽  
Low Cost ◽  
Atomic Emission ◽  
Metallographic Analysis ◽  
Separation Procedure ◽  
Plasma Atomic Emission ◽  
Spectroscopy Analysis ◽  
Metallurgical Grade Silicon ◽  
X Ray ◽  
Grade Silicon

A low-cost process for removing boron from metallurgical grade silicon was developed by Si-Al alloying, and the separation procedure of silicon grains from Si-Al melt by solidification was investigated in this paper. The microstructure and purity of silicon were characterized and detected by metallographic analysis, energy dispersive X-ray spectrometers analysis and inductive coupled plasma atomic emission spectroscopy analysis. The results showed that the content of boron in the purified silicon decreased from 128.00 ppmw to 27.62 ppmw. In addition, the process of purification with Si-Al alloying combined with the treatment of hydrofluoric acid could remove boron to a low content of 13.81 ppmw, the removal rate of which is 89.21 %. The results indicated that the removal of boron from metallurgical grade silicon by Si-Al alloying is an efficient and prospective method.

Analysis of Oxalic Acid Leachates of Geologic Materials by Inductively Coupled Plasma-Atomic Emission Spectroscopy

1982 ◽  
Vol 36 (5) ◽  
pp. 524-533 ◽  
Author(s):  
J. M. Motooka ◽  
S. J. Sutley
Keyword(s):  
Trace Metals ◽  
Oxalic Acid ◽  
Inductively Coupled Plasma ◽  
Emission Spectroscopy ◽  
Acid Leaching ◽  
Large Degree ◽  
Atomic Emission ◽  
Atomic Emission Spectroscopy ◽  
Quality Data ◽  
Plasma Atomic Emission

The introduction of induction coupled plasma-atomic emission spectroscopy (ICP-AES) has satisfied, to a large degree, the requirement for a higher quality data-generating technique. The methods used in exploration geochemistry include many partial or selective digestion techniques that can readily be adapted to ICP-AES analysis. Extensive and highly significant new information cannot only be added to a mineral's evaluation by providing associated trace metals previously overlooked or unobtainable because of detection limits, but also suggests a degree of differentiation of mineral fractions and their ability to scavenge trace metals from other sources. Oxalic acid leaching of soils and stream sediments has long been recognized as a method for dissolving secondary Fe and Mn oxides. Modifications in the digestive procedure to produce solutions compatible with ICP-AES instrumentation have not only significantly reduced analytical time and increased precision over previously used instrumental methods, but have also provided a technique that allows for greater geochemical interpretation.

scholarly journals Arsenoplatin-Ferritin Nanocage: Structure and Cytotoxicity

2021 ◽  
Vol 22 (4) ◽  
pp. 1874
Author(s):  
Giarita Ferraro ◽  
Alessandro Pratesi ◽  
Damiano Cirri ◽  
Paola Imbimbo ◽  
Daria Maria Monti ◽  
...  
Keyword(s):  
Biological Activity ◽  
Diffraction Data ◽  
Inductively Coupled Plasma ◽  
Emission Spectroscopy ◽  
Atomic Emission ◽  
Side Chain ◽  
Plasma Atomic Emission ◽  
Average Amount ◽  
X Ray ◽  
Inductively Coupled

Arsenoplatin-1 (AP-1), the prototype of a novel class of metallodrugs containing a PtAs(OH)2 core, was encapsulated within the apoferritin (AFt) nanocage. UV-Vis absorption spectroscopy and inductively coupled plasma-atomic emission spectroscopy measurements confirmed metallodrug encapsulation and allowed us to determine the average amount of AP-1 trapped inside the cage. The X-ray structure of AP-1-encapsulated AFt was solved at 1.50 Å. Diffraction data revealed that an AP-1 fragment coordinates the side chain of a His residue. The biological activity of AP-1-loaded AFt was comparatively tested on a few representative cancer and non-cancer cell lines. Even though the presence of the cage reduces the overall cytotoxicity of AP-1, it improves its selectivity towards cancer cells.

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