By Tao Jiang, Jiann-Yang Hwang, Patrick Masset, Onuralp Yucel, Rafael Padilla, Guifeng Zhou
Proceedings of a symposium subsidized through the Pyrometallurgy Committee and the strength Committee of the Extraction and Processing department of TMS (The Minerals, Metals & fabrics Society)
Held throughout the TMS 2012 Annual assembly & Exhibition Orlando, Florida, USA
March 11-15, 2012
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Additional resources for 3rd International Symposium on High-Temperature Metallurgical Processing
The off gas temperature and composition was continuously monitored and analyzed during the experiment. In order to expand the knowledge on NOx-formation in silicon metal production, such information is vital, Introduction Because of the negative environmental impact, the attention towards all kinds of NOx emissions increases in Norway. The authorities' demand towards better surveillance and control of emissions increases as well. Earlier and new industrial measurements in FeSi- and Si-metal furnaces reveal quite high NOx-emission.
These mixtures were held for 25 minutes in the furnace at temperature range of 1600-1650 °C. It was observed that charged mixtures began to melt around 10th minute (1350-1400 °C) and reached the maximum temperature about 15 minute. Metallic and slag phases were obtained after smelting. Slags were discarded and grinded. Magneticmetallic and non-magnetic parts of the slags were separated by using magnetic separation process. Magnetic parts were added to the metallic phase to re-melt. General flowchart of the process is shown in Figure 2.
It was tapped 13 times, giving a total of 87 kg's of silicon. The main purpose with the experiment was off gas analysis connected to NOx-formation, so the furnace parameters were focused to optimise the NOx-production, and not the Siproduction. Critical electrical parameters were continuous logged during the experiment. The effect/timeplot is showed in figure 4. Figure 4: Variation in power with experimental time. 37 Measurements A schematic overview of the furnace, off gas system and test points is shown in Figure 5.