Forsterite Bursting in Magnesia Chromite Bricks : Two Case Studies from Lead and Copper Smelting Furnaces

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Gregurek, Dean ; Majcenovic, Christian ; Spanring, Alfred ; Kirschen, Marcus:
Forsterite Bursting in Magnesia Chromite Bricks : Two Case Studies from Lead and Copper Smelting Furnaces.
In: RHI Bulletin. (2011) Heft 1 . - S. 49-53.

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Abstract

During most nonferrous metallurgical processes a common wear mechanism of magnesia chromite bricks results from the chemothermal load caused by iron silicate (fayalithic) slag [1,2]. However, an atypical, exceptionally high SiO2 supply caused by changes in the processing and/or the uncontrolled addition of silica sand results in the considerable formation of forsterite (Mg2SiO4) following contact with periclase, which due to the associated volume expansion causes forsterite bursting and deterioration of the brick structure. Two postmortem studies of magnesia chromite bricks taken from a copper and lead furnace are presented providing detailed chemical and mineralogical examples of this wear phenomenon, which whilst seldom experienced in nonferrous applications is quite typical for regenerator chambers in the glass industry in the case of extreme SiO2 carryover.