Phosphorus removal from manganese ore by plasma treatment

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Publication Type thesis
School or College College of Mines & Earth Sciences
Department Metallurgical Engineering
Author Hwang, Su Hyun
Title Phosphorus removal from manganese ore by plasma treatment
Date 2011-08
Description The contents of impurities, especially that of phosphorus, in manganese metal or in ferromanganese used in steelmaking are an important factor that affects product quality. More than 80% of phosphorus in the manganese products is introduced from manganese ore, the rest coming from coke and lime. Once it is absorbed into a molten manganese ore ferromanganese phase, it cannot be easily removed by smelting, and thus, ferromanganese must generally be low in phosphorus to begin with. As good quality ores of low phosphorus are depleted, the phosphorus content in manganese ores increases, and thus, the development of a new dephosphorization technology is needed. For this purpose, the removal of phosphorus compounds by vaporization directly from manganese ores using a plasma system was investigated in this study. For the removal of phosphorus, the effects of argon gas flow rate, hydrogen gas content in the plasma gas, and plasma torch power were analyzed. In addition, based on the thermal decomposition of hematite in the ores into magnetite at a high temperature, a magnetic separation was conducted after plasma treatment aiming to upgrade manganese ores. For the removal of phosphorus, a low argon gas flow rate and a high torch power were found to be effective, and the use of hydrogen gas as a reducing agent was more favorable than without. Magnetic separation after plasma treatment improved the ore grade with a decrease of iron content in the ore.
Type Text
Publisher University of Utah
Subject Ferro-manganese; Manganese ore; Phosphorus; Plasma
Dissertation Institution University of Utah
Dissertation Name Master of Science
Language eng
Rights Management Copyright © Su Hyun Hwang 2011
Format Medium application/pdf
Format Extent 1,766,128 bytes
Identifier us-etd3,39047
Source Original housed in Marriott Library Special Collections, TN7.5 2011 .H83
ARK ark:/87278/s6z32dcw
Setname ir_etd
Date Created 2012-04-24
Date Modified 2017-09-11
ID 194434
Reference URL https://collections.lib.utah.edu/ark:/87278/s6z32dcw