Chrome-alumina refractories

Invéstigations were carried out with different types of bauxites and chromites to prepare chrome-alumina refractories. Raw materials mixed in suitable proportions to give 10–12 percent Cr2O3 in the product were calcined at 1600° and then graded. Bricks formed under pressure and fired to 1600° indicate promising results but high porosity. Lime addition (2–3%) in the mixes appreciably reduces porosity but slightly affects the refractoriness. Chrome ores containing about 5 percent silica is suitable for the purpose. Chrome-alumina refractories thus made possess desirable properties and their use in steel pouring ladles and regenerators of open hearth furnaces may be considered. © 1964 Taylor & Francis Group, LLC