Fig. 1. Schematic drawing of testing system. 71 ( 1 )

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1850 UDC 669.162.283 : 669.162.263.24/. 25 Testing Method of High Temperature Properties of Blast Furnace Burdens Yojiro YAMAOKA, Hirohisa HOTTA, and Shuji KAJIKAWA Synopsis : Regarding the reduction under load test for measuring high temperature properties of blast furnace burdens, the test conditions, i.e. the load, gas flow rate, particle size and bed height were examined through tests and calculations based on a reduction model for fixed bed. Examinations covered also evaluation criteria of test results for high temperature properties. The results obtained are summarized as follows : (1) Test results are influenced by each of the load, gas flow rate, particle size and bed height conditions. (2) It is desirable to minimize the longitudinal difference of degree of reduction and the dependence on load of test results. The optimal test conditions (Fig. 2) were decided from such a point of view. (3) The following evaluation criteria of test results for high temperature properties were proposed : i) the temperatures at the beginning of softening and melt-down are high, with a small temperature difference; ii) the integral and average values of index of permeability resistance between softening and meltdown are small; and iii) the degree of reduction achieved at 1 000 to 1 200 Ž is high. Kokan K. K., 1 Kokan-cho Fukuyama 721)

Fig. 1. Schematic drawing of testing system. 71 ( 1 )

1852 Table 1. Chemical compositions of samples. Table 2. List of preliminary test conditions. Fig. 2. Conditions of reduction under load test. 72

Fig. 3. Effect of load on degree of contraction and index of permeability resistance. 73

1854 Fig. 4. Effect of gas flow rate on degree of reduction and index of permeability resistance. 74

Fig. 7. Effect of gas flow rate on longitudinal distribution of calculated degree of reduction. (Particle diameter : 12 mm). Fig. 5. Effect of particle diameter on degree of reduction and index of permeability resistance. Fig. 6. Comparison of observed reduction curves with calculated ones by three-interface model at various gas flow rate. (Bed height : 64 mm (calculation), 65 + 5 mm (experiment), Particle diameter : 12 mm (calculation), 11.1 `12.7 mm (experiment) ). 75

1856 Table 3. Longitudinal distribution of degree of reduction. Fig. 8. Effect of gas flow rate, particle diameter and bed height on mean calculated degree of reduction rk) and the difference in calculated degree of reduction between top and bottom of bed (JR). 76

Table 4. Softening and melting characteristics of samples. Fig. 9. Relation between softening and melting characteristics and mean degree of reduction achieved at 1 000 and 1 200 Ž for sinter and pellets. 77

Appendix (A-1 ) i : M (Fe2O3 Te3O4), MF (Fe3O4 Fe) W (Fe3O4 FeO), F (FeO Fe) (A-2 ) (A-4 ) (A-5 )

7 ) O. BURGHARDT and K. GREBE: Stahl u. Eisen, 89 (1969), p. 561 8) P. BARNABA, M. CECCARINI, and R. FONTANA: Boll. Tech. Finsider, Feb. (1976), p. 69 9) P. BARNABA and M. PALCHETTI: Boll. Tech. Finsider, Dec. (1976), p. 744 (1979), p. 349 15) K. POLTHIER: Stahl u. Eisen, 87 (1967), p. 960 (1977), p. 1099 18) R. H. SPITZER, F. S. MANNING and W. O. PHILBROOK: Trans. Met. Soc. AIME, 242 (1968), p. 618 79

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