On the Making of Self-Fluxing Sinter

Abstract

In line with the starting of experiments on the use of self-fluxing sinter in blast furnaces, the experimental production of lime sinter using 5-10% of lime stone was conducted at Kukioka D. L. Sintering Plant since May, 1958, and from the operation data the following, items were inferred: -
1) Although in lime sinter the mean grain size was getting smaller, the amount of the fine fraction (minus five millimeter fraction) became rather decreased than in normal sinter, from which it was inferred that lime sinter was more improved in point of grain distribution.
2) Lime sinter had almost the same degree of strength as normal sinter.
3) By adding 5-10% of lime stone, the output of sinter was increased by 4-6.5%. When calculated in terms of iron, the output, however, was almost constant.
4) In case of using the burden of 100% lime sinter, operation was carried out with special attention paid to the control of basicity, and for that purpose such measures as the use of foreign fine ores divided into the three classes according to SiO₂ content, etc. were enforced, and, as the result, the sinter that could almost satisfy the requirements of blast furnaces was able to be produced.
5) Cost of sinter production was decreased by 2% and 5.5% by the addition of 5% and 10% of lime stone, respectively, but the cost in terms of iron was almost unchanged.
For these reasons it was concluded that lime sinterwas superior to normal sinter.