4th International Symposium on High-Temperature by Tao Jiang, Jiann-Yang Hwang, Phillip J. Mackey, Onuralp

By Tao Jiang, Jiann-Yang Hwang, Phillip J. Mackey, Onuralp Yucel, Guifeng Zhou

Within the final decade, worldwide metallurgical industries have skilled quick and filthy rich progress. hot temperature metallurgical expertise is the spine to help the technical, environmental, and low in cost wishes for the growth.

This symposium presents a degree to introduce the developments and advancements of recent hot temperature metallurgical applied sciences and their functions to the parts of processing of minerals, extraction of metals, education of refractory and ceramic fabrics, sintering and synthesis of good debris, therapy and recycling of slag and wastes, and saving of power and safety of environment.Content:

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Owe to the temperature has hysteretic nature; therefore, the heating process was put into two steps. The first step was the temperature from 0°C to 180°C, the heating rate was 30°C/min, which could not affect the result. And then, the second step is the temperature from 180°C to 360°C, the heating rate were 10°C/min, 12°C/min, 14°C/min, 16°C/min, and 18°C/min, respectively. The effect of heating rate on the result was showed in Table II. Table II The Effect of Decomposition on Heating Rate 10°C/min 12°C/min 14°C/min 16°C/min 18°C/min Eutectic N N N N Y Black N N Y Y Y *N—inexistence, Y—existence From the Table II, it can be found that it can only produce the black impurity in the product, if the heating rate exceeded 14°C/min.

Introduction The ITmk3 process upon which this paper focuses was developed by Kobe Steel in its research facilities [1]. After pilot testing at Kobe Steel's Kakogava Works in 1999-2004 the pilot demonstration plant was built and operations were successfully carried out by Mesabi Nugget joint venture in 2002-2004. Steel Dynamics put into operation the commercial plant at the Mesabi Nugget site in Hoyt Lakes (Minnesota) in 2010. Results were consistent with nugget characteristics confirming ITmk3's flexibility with respect to raw material inputs.

It can be over 95% under the conditions of reduction temperature 1150°C, reduction time 3h, and aluminum excess 20%. The reduction residue mainly contains CaO-AI2O3, 12CaO-7Al 2 0 3 and unreacted L1AIO2. (2) The reduction residue was leached with a mixture of sodium carbonate and sodium hydroxide. The alumina transformed soluble sodium aluminate entering into the leaching solution. The alumina leaching rate is over 80%. 1 can be obtained after carbonation precipitation of the sodium aluminate solution.

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