By Tao Jiang, Jiann-Yang Hwang, Patrick Masset, Onuralp Yucel, Rafael Padilla, Guifeng Zhou
Proceedings of a symposium backed by means of the Pyrometallurgy Committee and the power Committee of the Extraction and Processing department of TMS (The Minerals, Metals & fabrics Society)
Held through the TMS 2012 Annual assembly & Exhibition Orlando, Florida, USA
March 11-15, 2012
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Extra info for 3rd International Symposium on High-Temperature Metallurgical Processing
The tap hole itself - shown in Figure 2 - consists of a well block, an upper nozzle, the two plates (where the lower one is sliding) and a collector nozzle. The well block usually has the same life time than the rest of the lining and stays in the furnace whereas the plates and nozzles have to be exchanged on a regular basis. The base steel plate has a screwed special opening to give the possibility also for a well block change if necessary. The upper nozzle and the plates are made of a high fired alumina/chromium-oxide refractory, which was developed especially for the requirements in the copper industry.
The acid leaching efficiency of 81% is achieved after the sample ores are reduced with sulfur for only 2min. The leaching efficiency of Mn increased obviously as the roasting time increases from 2min to 10min. This can be explained thermodynamically that AG? values of 29 the reactions of MnÜ2 reduced by sulfur are much less than zero, presented in Figure 4. The suitable reduction time of 10min should be chosen at 550 °C. Figure 6. Effects of S/Mn Mole Ratio on the Leaching Efficiency of Mn Figure 7.
The measurements also show that the NOx formation (mainly as thermal N0 X ) is distinct connected to the formation of dust (SiG->SiO 2) in the combustion chamber above the furnace surface, when the temperature is high and the access to N2/O2 is good. This means that stoking, charging and temperature straight above the furnace surface is important factors for the NO x formation. Silicon is produced in submerged arc furnaces, where quartz reacts via several sub reactions, with wood, charcoal, and coal.
3rd International Symposium on High-Temperature Metallurgical Processing by Tao Jiang, Jiann-Yang Hwang, Patrick Masset, Onuralp Yucel, Rafael Padilla, Guifeng Zhou