METHOD FOR PELLETIZING COKE BREEZE AND ANTHRACITE AND MANUFACTURE OF SINTERED ORE

摘要

PURPOSE:To improve the combustion efficiency of cake breeze and anthracite, to reduce the amt. of NOx in an exhaust gas and to improve the quality of sintered ore by regulating the moisture content in pulverized coke or anthracite, executing pelletizing, mixing it into a blending raw material for sintered ore and executing sintering. CONSTITUTION:Pulverized cake or anthracite occupied with =70wt.% grains having =l.0mm grain size is blended with a raw material for sintered ore contg. 1 to 30 wt.% quicklime or having =10 wt.% FeO content so that its amt. will be regulated to 10 to 50wt.% to the whole. Hot air of 150 to 400 deg.C is blown thereon to regulate its moisture content to 10 to 28wt.%. Then, it is rotated in a pelletizer using centrifugal force for 100 to 700 times at 50rpm (number of rotations per minute) and is pelletized at a size distribution in which grains of 0.25 to 3.0mm occupy by =80 wt.% to the whole. This granulated product is mixed into the blending raw material for sintered ore in such a manner that its amt. will be regulated to 0.1 to 5 wt.% to the whole, and this mixture is fed to a sintering machine and is sintered. The combustion efficiency of cake breeze or anthracite in the sintering raw material is improved, the content of N deg.x in a sintering exhaust gas is remarkably reduced, the quality of the sintered ore such as a reduction degrading rate and a reducing rate is also improved and the stable operation of a blast furnace is permitted.