| In this work, olivine has been selected as one of the possible new alternatives. Chemical compatibility of olivine with fayalite slag, as well as its very attractive price were the main factors considered in selection. Olivine as a solid solution of forsterite and fayalite should offer, a priori, good resistance to fayalite slag. Calcium ferrite slags, which are also in use in copper industry, will also be tested.; Current tendency in refractory applications is to use castables over bricks. Advantages like fast installation and possibility of local repairing lead to significant money saving. Castables unlike the bricks have no joins---the easiest path for possible penetration causing significant damage of refractory lining. Therefore part of this work is focusing upon castables, their design and characterization.; The essential part of this work has been to study the olivine-MgO refractory, their interaction with fayalite and calcium ferrite slags and to, determine their corrosion resistance against those slags.; Four olivine-MgO castables (C-2, 3, 4 and 5) with graded olivine/MgO mutual proportion have been prepared and undergone corrosion testing at 1400°C for 8 hours. A magnesia-chrome brick (REF) as a reference and a commercial olivine-based castable (C-1) as an additional reference were involved in the corrosion testing.; As for dissolution-erosion is concerned, the magnesia-chrome brick (REF), as expected, has shown the best performance in both slags.; As far as penetration is concerned, the tested olivine-MgO castables (C-2, 3, 4 and 5) have been penetrated only up to 1 mm in both slags. A self-protecting mechanism as a result of the castable-slags interactions keeps the penetration at a very low level. (Abstract shortened by UMI.)... |
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