Analysis of magnesia chrome refractories weared in a rotary cement kiln

摘要

Magnesia chrome bricks are basic refractories which are essentially composed of magnesia and interstitial phases: Mg2SiO4 and Mg(Al1.5Cr0.5)O-4. These refractories, used in the clinkering zones lining of moroccan cement kilns, have presented a premature wear. X-ray diffraction, scanning electron microscopy, and thermal expansion were used to characterize the damaged refractories. The colorimetric method shows the presence of toxic hexavalent chromium in the hot face of the refractory. [References: 9]