Abstract
AbstractA comparison was made between a commercial alumina cement and a calcium aluminate cement prepared in an experimental electric furnace on the basis of chemical and physical tests. The experimental product, a relatively pure tricalcium penta‐aluminate (3CaO.5Al2O3), showed refractory properties superior to the commercial product; for example, in a sagging test, a refractory mixture made with the experimental cement and grog showed greater resistance to deformation at 1400° and 1450°C. than a mixture made with the commercial cement and a resistance comparable to that representative of a cone 30 firebrick. The experimental product shows promise as an electrical insulating cement for Chromel‐wound furnaces. An alumina‐type cement was also found to give satisfactory service when used with fire‐clay grog to form a monolithic roof over an electric‐phosphate reduction furnace.
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