<報文>鉄鉱石類の還元強度試験法に関する研究(第1報) : 焼結鉱の還元強度試験

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An experimental apparatus, a modification of the Linder's apparatus, was designed and constructed for measuring the reduction strength of iron ores at room and elevated temperatures. The reduction strength could be measured by this apparatus under the controlled oxygen potential of the gas. Also the reduction of the sample and rotation of the reaction tube could be conducted separately without intermission. Isothermal test, heating-up test and heating-up test with rotation of reaction tube were carried out for measuring the reduction strength of sinter. On the basis of the experimental results testing methods and testing conditions were exmained. The major conclusions are summaized as below. For the isothermal test of reduction strength : 1) Remarkable decrease in reduction strength was found in the reduction stage from hematite to magnetite at low temperature (500-550℃). 2) Reduction strength of the sinter reduced at low temperature was risen again by holding it at high temperature (750℃). 3) Reduction strength decreased as the reduction proceeded. 4) Use of H_2-H_2O gas as reductant gave similar decrease in reduction strength of the sinter as that for CO-CO_2 gas. For the heating-up test of reduction strength : 5) For constant rate of heating-up, heating-up to higher temperature showed lower reduction strength. 6) For heating-up to a specified temperature, lower rate of heating-up gave lower reduction strength. For the heating-up test with rotation of reaction tube : 7) Reduction strength obtained by this test agreed well with that obtained by the isothermal test at low temperature. It was concluded from the results stated above that the isothermal test at low temperature was found to be a most appropriate test for the strength control of iron ore sinter in a sintering process or for the comparison of the strength among different brands of the iron ores, because of better reproducibility, better detectability and better operational efficiency. On the other hand, the heating-up test was found better for elucidating the behaviour of the sinter in a blast furnace. In addition, the testing apparatus developed by us was found to have an excellent performance for determining the reduction strength of sinter.
東北大学の論文
1973-11-24

<報文>鉄鉱石類の還元強度試験法に関する研究(第1報) : 焼結鉱の還元強度試験

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