Coking of coal mixts. contg. low-grade types - after briquetting and regrinding at least part of the mixt.

摘要

Coke prodn. is carried out by coking a mixt. of coals, including non-coking or poorly coking types with a swelling index (SI) of =5. At least a portion of the coal feed is briquetted with a pitch or bitumen having a Kraimer-Sarnow point (KS) of 70-85 degrees C, the rest being in the form of fines such that 80% of the particles are smaller than 2 mm. The improvement comprises regrinding at least part of the briquettes to a size such that 50% of the particles are smaller tan 3-5 mm. Regrinding the briquettes increase the mechanical strength of the coke or allows a greater proportion of non-coking coal to be used.