1978 Volume 64 Issue 1 Pages 121-127
The effect of reduction condition of hematite ore (32-60mesh) under high pressure (0-100kg/cm2) H2 flow was studied using dynamic gas flow type high pressure DTA equipment. Besides usual nonisothermal DTA method, new attempt on isothermal DTA method was made by the equipment.
The results obtained are as follows:
(1) The rate of reduction was high when reduction temperature was raised from 500°C to 850°C. The lowering of reduction rate around 700°C, which was pointed out in some papers, was not observed.
(2) The effect of an increase of H2 pressure on reduction rate became very small at a pressure upper than 15kg/cm2. The effect of H2 pressure was relatively large under a reduction condition of low temperature and low gas pressure.
(3) The rate of reduction increased with increasing H2 (STP) gas flow rate. It was found that the effect of gas flow rate on the rate of reduction was remarkably larger than the effect of gas pressure under the experimental conditions in this study.
