Coulometric investigation of the drying conditions of high-grade iron ores for chemical analysis.
Drying conditions for several iron ores have been investigated by the coulometric microdetermination of water. Samples, which were heated in an atmosphere of dry argon at 110 degrees for 3-4 hr and cooled, usually evolved less than 0.015% of water during a further 1 hr of heating. Therefore the difference in water content of the sample thus treated did not significantly influence the analytical results for total iron. Some magnetites and sintered pellet could be dried readily by heating for 2 hr in dry argon. Heating of samples of high water content for too long is not advisable as they may evolve some combined water.
Yoshimori
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Faculty of Engineering, Science University of Tokyo, Kagurazaka, Shinjuku-ku, Tokyo 162 Japan.
Asano
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Harada
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