Abstract
Fe2O3 and Cr2O3 were prepared by calcining iron and chromium salts respectively, and the calcining conditions such as temperature, time, and heating velocity on the size of particles of the products were investigated.The results indicated that: (1) In gereral, the size of unit particles of the products increases as the temperature and time of calcination are increased. (2) Much larger particles of oxides may be obtained if the salts are decomposed very slowly and kept at fairly low temperature for a long time than decomposed rapidly and heated at high temperatures. (3) Minute particles may be obtained if the time of calcination is reduced to a few seconds even when the temperature of calcination is very high.
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