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Metals 2017, 7(3), 74; doi:10.3390/met7030074

The Effect of Varying Mixing Temperatures and Baking Level on the Quality of Pilot Scale Anodes—A Factorial Design Analysis

1
Materials Science and Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
2
SINTEF Materials and Chemistry, NO-7465 Trondheim, Norway
3
Materials Science and Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
4
Hydro Aluminium PMT, Box 303, NO-6882 Årdal, Norway
Current address: SINTEF Materials and Chemistry, NO-7465 Trondheim, Norway.
Current address: Norwegian Institute for Air Research, NO-2027 Kjeller, Norway
*
Author to whom correspondence should be addressed.
Academic Editor: Houshang Alamdari
Received: 20 December 2016 / Revised: 7 February 2017 / Accepted: 13 February 2017 / Published: 25 February 2017
View Full-Text   |   Download PDF [2731 KB, uploaded 25 February 2017]   |  

Abstract

Identifying optimum anode baking level and mixing temperature are important when producing high quality anodes. The effect of varying mixing temperature and baking level were investigated in terms of the resulting apparent anode density, specific electrical resistivity (SER), air permeability, coefficient of thermal expansion (CTE), air reactivity, and CO2 reactivity. Six pilot-scale anodes were prepared at Hydro Aluminium using a single source petroleum coke and <2 mm coke fractions. A coal tar pitch was used with Mettler softening point of 119.1 °C. The aggregate was mixed at 150 °C or 210 °C and baked to a low, medium, or high baking level. A 22 full-factorial design analysis was performed to determine the response of the analyzed properties to the applied mixing and baking temperature. Apparent density, SER, and air permeability were found to be highly dependent on mixing temperature. Apparent density and SER were also slightly affected by baking level. CTE was found to be independent of both baking level and mixing temperature. Air reactivity was found to be mainly dependent on baking level, while CO2 reactivity was dependent on both mixing temperature and baking level. View Full-Text
Keywords: carbon anodes; effect of mixing temperature; effect of baking level; anode performance; factorial design carbon anodes; effect of mixing temperature; effect of baking level; anode performance; factorial design
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MDPI and ACS Style

Sommerseth, C.; Thorne, R.J.; Ratvik, A.P.; Sandnes, E.; Linga, H.; Lossius, L.P.; Svensson, A.M. The Effect of Varying Mixing Temperatures and Baking Level on the Quality of Pilot Scale Anodes—A Factorial Design Analysis. Metals 2017, 7, 74.

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