<報文>鉄鉱石のペレタイジングに関する研究(第1報) : 微粉鉄鉱石のペレタイジング特性に関する基礎的研究

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The present paper deals with the general rule for pelletizng of the different types of fine iron ores, namely Indian hematite, Kamaishi magnetic concentrates and Kutchian limonite. The results obtained are summarized as follows : (1) The grinding characteristics of ores can be represented by the size modulus, k and by the size distribution function, m through Gaudin-Schuhmann equation. The value of m is determined by the type of ores and that of k decreases with the increase in the grinding time.(2) The compressive strength of green pellets increases linearly with the increase in the specific surface area of the raw materials as measured by the air permeability method and it is independent of the type of the raw materials studied. The compressive strength of both the green and dry pellets increases with the decrease in the values of the size distribution parameters, k and m and such effects are more remarkable in the case of dry pellets.(3) There are optimum values of moisture content for green balling for the specific ores and the range of the optimum moisture content becomes narrow for the green pellets of higher compressive strength, resulting in the difficulty in balling operation.(4) The compressive strength of the burnt pellets produced from the same ore is mainly determined by the porosity of the pellets. The effect of the reduction in particle size of ores is compatible to that of the rise in the firing temperature.
1968-03-20