In order to study the basic reactions in the coal gasification by molten iron, the influence of sulphur or phosphorus on the rate of dissolution of graphite from rotating graphite cylinders into liquid iron alloys was investigated. The experiments were conducted in a temperature range of 1573-1773 K with rotational speed varying from 1.67 s-1 to 65 s-1. Two kinds of electrode-grade graphite (non-graphitic and graphitic carbon) were used. The results are summarized as follows:(1) Phosphorus decreased the overall mass transfer coefficient k, the reduction of which was presumed to be due to the effect of phosphorus adsorption on the graphite/iron interface.(2) Sulphur decreased k more than phosphorus, suggesting a more intensive surface activeness of sulphur. Particularly in the case of non-graphitic carbon, k extremely diminished.
Synopsis The Wicke-Kallenbach method had not been applied to the high temperature measurement due to the difficulty in preventing gas leakage from the portion between the diffusion cell and a sample. However, this problem has been overcome by the development of an Na20-Si02 cement containing liquid phase at elevated temperatures. This technique made it possible to evaluate the effective dif fusivities of Ar-He through coke and graphite over a wide temperature range of 20 to 1300°C. The effective difusivities for CO-C02 up to 300°C and permeation fluxes for argon and helium up to 1000°C were also measured. From the measurements, molecular, Knudsen and surface diffusion through pores could be evaluate independently. The technique proposed in the present work has also been applied to the in situ measurement of the effective diffusivity of Ar-He through coke in the course of oxidation with carbon dioxide.
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