Investigation of the effect of blast furnace raceway temperatures on coke properties
Details of the design and operation of the induction furnace constructed in the first stage of the project are reported. The results of a series of trials carried out in order to investigate the effects of blast furnace raceway temperatures on coke properties and the mechanisms involved are presented and discussed. The results showed that thermal effects alone had little effect on coke size and that thermal disintegration of coke particles was not a factor. All of the cokes suffered a reduction in strength, in terms of abrasion resistance, which increased with increasing temperature. This was related to catalytic graphitisation by iron present in the coke ash, the level of alkalis in the coke and the loss of the ash components by reaction and volatilisation at high temperatures. The ash contents of the cokes were drastically reduced by heating to raceway temperatures. The loss of ash was reflected by the loss of sulphur and the volatile alkali and alkaline earth elements below 2000 C, and silicon and aluminium at higher temperatures. In general, the thermophysical changes in the induction furnace were less than those observed in the blast furnace while the thermochemical changes were more marked. These effects were considered to be the result of the lower heating rates, more uniform heating conditions and longer soaking times experienced by the induction furnace cokes.
Bibliographic Reference: EUR 13563 EN (1991) 100 pp., MF, ECU 8, blow-up copy ECU 12.50
Record Number: 199111040 / Last updated on: 1994-12-02
Original language: en
Available languages: en