By Tao Jiang, Jiann-Yang Hwang, Patrick Masset, Onuralp Yucel, Rafael Padilla, Guifeng Zhou
Proceedings of a symposium backed via 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 info for 3rd International Symposium on High-Temperature Metallurgical Processing
Particularly interesting are the results showing that the NOx level rise with a decreasing amount of air let into the furnace. This shows the ability to form NOx even at a low supply of N2 and 0 2 . One explanation might be that at a low inflow of air the overall velocity field through the hood is reduced, forming "hot spots" of air heated by the SiO combustion and still containing enough N2 and 0 2 to form NOx. In that respect the velocity fields inside the hood will have a substantial effect on the NOx formation III.
In recent years, low grade ferronickel or nickel pig iron (NPI) is used in stainless steel production to reduce expenditure of nickel price. In this study, Turkey East Anatolian region lateritic nickel ores were directly introduced carbothermal reduction to produce NPI. 3% Cr was mixed with metallurgical grade coal at different stiochometric ratios. The samples were smelted at 1600-1650 °C temperature range in an induction furnace for 25 min. In the second experimental set, different processes times were carried out from 15 to 35 min.
To prevent freezing of copper in the tapping channel during this time the lower plate is equipped with nitrogen purging (Figure 5). For this reason this moving plate has a small drilling and is connected to a nitrogen pipe. When the slide gate is closed the outlet of the drilling lies exactly in the tapping channel So a constantflowof nitrogen keeps the channel open. Figure 5. Upper Plate and Lower Plate with Nitrogen Piping. Due to the low distance between slide gate and casting launder an adequate heat protection is installed.