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Commercial r e f r a c t o r i e s were t e s t e d f o r up t o 500 h i n b o t h b a s i c and a c i d i c s l a g s. The s l a g compositions t y p i f y t h o s e expected i n s l a g g i n g c o a l g a s i f i e r s. The s l a g temperatures ranged up t o 1600°C. Compositions t e s t e d have i n c l u d e d s i l i c o n c a r b i d e s , chrome-alumina-magnesia s p i n e l s , and alumina and magnesia-based r e f r a c t o r i e s w i t h v a r i o u s amounts of chromia and s i l i c a. I n some tests, t h e c o l d f a c e s were water cooled.
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