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[email protected]Slagsilicon mass ratio2.4 x 10-6 mass transport in slag the kinetics of boron removal from liquid silicon during slag refining have been investigated in this research by means of several small-scale experimental studies at temperatures of 14500c to 16500c.Slag and silicon, in batch weights of 7 g, were heated together in an.
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The present invention relates to a method for the preparation of solar grade silicon comprising crystallization of large high purity silicon crystals in a hyper eutectic binary or ternary alloy containing silicon, or a refined silicon melt, wherein small silicon crystals are added to the melt and the resulting large silicon crystals are separated from the melt.
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This study investigates the efficiency of b and p removal from ferrosilicon alloy via slag refining.Silicon was alloyed with iron and the alloy was subjected to different compositions of cao-sio-alo ternary slag at 1600 c.Distributions of b and p between alloy and slag phases were investigated by icp-oes analysis.Results indicate that oxygen potential and basicity of slag can.
Nitrogen and aluminum and fluxing agents ai2o3, sio2, cao and mgo are added to molten silicon to create an oxy-nitride slag that acts as a sink for dissolved boron and phosphorus.The nitrogen can be added by bubbling nitrogen gas through the molten silicon the aluminum can be added as aluminum metal or as ai2o3.Normally, the silicon must initially be deoxidized to allow the boron and.
Figure 26 shows that al, ca and mg elements could be removed by slag refining meanwhile their removal rates were 85.Figure 27 shows the analysis of metal impurity in silicon and slag by epma after refining for 2 h at 1823 k under sio 2 caoal 2 o 3 systems.It could be clearly seen that the distribution of.
Thermodynamics on sog-si refining processes institute of industrial science,.Thermodynamics and processing on solar grade silicon sog-si production materials production and recycling engineering lab.Formerly ferrous metallurgy lab.2 slag sio 2 crucible molten si-mg alloy molten mgsio 3, sio 2 satd.
Slag composition gold.How to choose gold smelting flux - superb electromachinery.Copper slag or fayalite slag is a by-product obtained during the matte smelting converting and refining of copper fig 7 11 54 59 it has been estimated that for every tonne of copper produced about 2 2 tonnes of slag is generated 60 as a consequence of the relatively low grades of copper concentrates now.
Removal methods of impurity from metallurgical-grade silicon si are intensively studied to produce solar-grade silicon sog-si with a smaller economical load and lower cost.Removal of phosphorus p has been an important issue because of difficulties in application of conventional metallurgical methods such as solidification refining.Because p evaporates preferentially from molten si due.
Refining antimony information.Kaken research projects vacuum refining of molten.Refining antimony information - 3d antimony refinery machine in thailand - dom-na-kluc oct 18 2013 many oil refinery and petrochemical projects worth billions of u s dollars have antimony refining process machinery in myanmar.
As a new promising route for solar grade silicon sog-si production, metallurgical refining processes was developed in the early eighties of the last century, followed by the establishment of nedo-jfe process in the beginning of the 2000s, where p was removed by electron beam eb in vacuum conditions and b by ar-h2o plasma.
The mechanism by which b is removed from si to a molten caosio 2 cacl 2 slag, and its subsequent evaporation to a gas phase at 1723 k, has been evaluated with a view to optimize the production of solar-grade si.By assuming a diffusion model for the transfer of b from si to molten slag, and its evaporation to a gas phase, the diffusion coefficient of b in slag was investigated.
The year of 2008 the production of global solar grade poly-silicon has reached 43500 tons, accounting for 65 of the global poly-silicon eg and sog 2.Szlufcilk et al 3 have made the solar cells with the efficiency of 12.38 out of the solar grade poly-silicon which was purified by metallurgical method it is a.
While production of solar-grade silicon sog-si has been dominated recently by the modified siemens process and a fluidized bed reactor process, obtaining a stable supply of sog-si at lower cost.
Electron beam technology is an effective means for purifying solar-grade silicon,refining refractory metals and its alloy,preparing high purity special steel and super clean steel,because it has the advantages of high energy density and vacuum degree and it can be.
Production costs of sog-si, effective removal of the aforementioned impurity elements is essential for producing silicon through metallurgical means 5.Electromagnetic levitation eml refining is an ideal technique for containerless processing of liquid metals.
The world production of sog-si was estimated to be approximately 0.15 million metric ton in 2011.Seg-si is also produced chiefly by siemens process, and its world production was estimated to be about 0.03 million metric ton in 2011.Until now, silicon has not been practically produced by molten salt electrolysis.
The slag treatment on mg-si for sog-si production is based on the principle of liquid-liquid extraction in steel industry.The slag used for the extraction of impurities must dissolve individual impurities better than molten silicon does, the solubility of silicon in the slag must be low, and the slag must be nonreactive with molten silicon and.
Articleosti786367, title production of solar grade sog silicon by refining liquid metallurgical grade mg silicon final report, 19 april 2001, author khattak, c p and joyce, d b and schmid, f, abstractnote this report summarizes the results of the developed technology for producing sog silicon by upgrading mg silicon with a cost goal of 20kg in large-scale production.
For slag refining, when the boron content of the molten silicon was higher than 2.0 mass ppm, the chemical reactions were the rate determining steps, which could mainly be attributed to the attenuation of the oxidant content or the basicity near the slag-silicon.
A direct metallurgical route for production of solar grade silicon can be five times more energy efficient than the conventional siemens process that uses more than 200kwhkg si.A metallurgical route would reduce the payback time the time during which the solar cell produces the same amount of energy that was used to create it significantly.
1 distribution of impurity elements in slag-silicon equilibria for oxidative refining of metallurgical silicon for solar cell applications m.Johnstona aand m.Barati adepartment of materials science and engineering, the university of toronto, 184 college street, toronto, on, canada, m5s3e4.
Solar silicon i 0830 0855 a.Souto, javier bullon, ramon ords, jm miguez, ferroatlantica, industrial scale vacuum application in the ferrosolar project 0855 0920 ye wang, wenhui ma, and kazuki morita, university of tokyo, removal of boron from molten silicon by cao sio 2 cacl 2 slag treatment.
Kazuki morita took bachelor degree in 1983, master degree in 1985, and doctor of engineering in 1988 from the university of tokyo at the department of metallurgy.He has his expertise in physical chemistry on high temperature materials processing mostly related to iron- and steelmaking, silicon refining, and materials recycling as a professor at the department of materials engineering in the.
While production of solar grade silicon sog-si has been dominated recently by the modified siemens process and a.Comprising of slag and solidification refining, acid leaching, vacuum melting and directional solidification steps, for producing sog-si from.
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Silicon, accounting for one third of the finished module cost.In recent years a lot of research has been conducted on refining metallurgical grade silicon mgof -si, purity96 to solar grade silicon sog-si, with the ultimate goal of reducing the production cost.Metallurgical refining route has.