日本金属学会誌

J. Japan Inst. Metals, Vol. 29, No. 5 (1965),
pp. 501-508

Study on the Reaction between Aluminum and Sodium Fluoride

Kenji Ono1, Tomoo Matsushima1 and Tsutomu Ito1

1Research Institute of Mineral Dressing and Metallurgy, Tohoku University, Sendai

Abstract:

The reaction between aluminum and sodium fluoride was studied by means of differential thermal analysis and X-ray analysis.
It was noticed that the reaction proceeded in considerable degree through the formation of sodium vapor and cryolite by the reaction of molten aluminum and solid sodium fluoride at a reduced pressure above 1020° to 1150°K.
The reaction proceeded as follows:

2NaF(s)+1/3Al(l)=Na(g)+1/3Na3AlF6(s,β).

The reaction pressure of sodium versus temperature was determined by the following equation in the temperature range of 1063° to 1153°K.
log PNa(mmHg)=-9,995/T(°K)+10.752.

Thermodynamic consideration was also given to the above reaction.


(Received 1964/12/10)

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