Element Distribution in Silicon Refining: Thermodynamic Model and Industrial MeasurementsReport as inadecuate




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JOM

, Volume 66, Issue 11, pp 2343–2354

First Online: 08 November 2013Received: 08 April 2013Accepted: 11 October 2013

Abstract

To establish an overview of impurity elemental distribution among silicon, slag, and gas-fume in the refining process of metallurgical grade silicon MG-Si, an industrial measurement campaign was performed at the Elkem Salten MG-Si plant in Norway. Samples of in- and outgoing mass streams, i.e., tapped Si, flux and cooling materials, refined Si, slag, and fume, were analyzed by high-resolution inductively coupled plasma mass spectrometry HR-ICP-MS, with respect to 62 elements. The elemental distributions were calculated and the experimental data compared with equilibrium estimations based on commercial and proprietary, published databases and carried out using the ChemSheet software. The results are discussed in terms of boiling temperatures, vapor pressures, redox potentials, and activities of the elements. These model calculations indicate a need for expanded databases with more and reliable thermodynamic data for trace elements in general and fume constituents in particular.

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Author: Mari K. Næss - Ida Kero - Gabriella Tranell - Kai Tang - Halvard Tveit

Source: https://link.springer.com/







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