Vapor-pressure of calcium corresponding to the reduction of calcia by aluminum

Srikanth, S. ; Jacob, K. T. (1991) Vapor-pressure of calcium corresponding to the reduction of calcia by aluminum Transactions of the Indian Institute of Metals, 44 (5). pp. 369-373. ISSN 0019-493X

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Abstract

The equilibrium pressure of calcium corresponding to the reduction reaction 6CaO (s)+2Al(l) half-arrow-right-over-half-arrow-left 3CaO.Al2O3 (s) + 3Ca (g) has been measured by Knudsen effusion - mass loss analysis in the temperature range 1190 - 1500 K. The measured vapour pressure can be expressed as a function of temperature by the relation: log p(Ca) (Pa) = -10,670/T + 9.267 The calcium generated is partially absorbed by aluminium to form an alloy. The equilibrium composition of the alloy at 1373 K was found to be 22 mol% Ca-78 mol% Al. The measured vapour pressure is in good agreement with that computed from thermodynamic data.

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