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The corrosion of magnesia–chrome (MgO–Cr 2 O 3 ) brick in molten MgO–Al 2 O 3 –SiO 2 –CaO–Fe t O slag has been characterized using a dynamic rotary slag corrosion testing for various test cycles at 1650°C. The open porosity decreases from 15.3 to 4.0% for three cycles, then it gradually increases from 4.0 to 4.8% when the test is extended to nine cycles,...