In continuation of the study on reactivity of carbon in the formation of CaC
2, the effect of the addition of small amounts of some inorganic substances, such as Fe
2O
3, Al
2O
3, SiO
2 and KOH, upon the reaction between carbon and CaO in solid phase was studied at 1, 800°C by means of a vacuum electric furnace.
Generally, no acceleration could be observed throughout the reaction in the rates of the formation of CaC
2. In the earlier stage of the reaction, it was rather likely that the presence of inorganic substances decreases the rates of the formation of CaC
2.
It is likely that these experimental results attributed to the following reasons that the inorganic substances disturb the mutual diffusion between carbon and CaO, and more-over, that they react respectively with carbon and CaO forming metal-carbides and CaO-metal oxides compounds, such as calcium-silicate, aluminate and ferrite.
Accordingly, it was suggested that the inorganic substances have negative effect in the formation of CaC
2.
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