Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Measurement of Apparent Viscosity of Variousi Blast Furnace Burdens at Softening Temperature
Masakazu NAKAMURAYoshiaki SEKIShinichi KONDO
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1970 Volume 56 Issue 12 Pages 1456-1466


The apparent viscosity of sintered ores and pellets was measured by creep test at elevated temperature.
After samples were reduced to the intended degree, atmosphere around the saple was changed from reducing gas to inert one in order to keep the degree of reduction constant during the following creep test. Apparent viscosity was calculated from the rate of deformation under various load and discussed in relation to packing state of sample particles.
The effects of sample composition, reduction degree, testing temperature and packing state on viscocity were examined with the following results.
1) In general, oxidized samples showed higher viscosity than reduced ones.
2) Samples which contained only acidic components tended to have lower viscosity and activation energy of viscosity than those which contained basic components such as CaO and MgO.
3) In oxidized sample, the increase of basicity of slag components caused the decrease of viscosity. While in reduced samples, viscosity had its minimum value in the basicity of about 1.5.
4) Added silica caused increase of viscosity, but once it reacted with FeO to form fayalite (2 FeO. Si02) viscosity decreased.
5) The effect of magnesia (MgO) on viscosity was affected by coexistence of alumina (Al203)

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