Experimental study on strength and powder ratio of cold solid pellet
ZHOU Chao-gang1,2, HU Jin-zhen1, WANG Shao-jun3, WANG Shu-huan1,2, AI Li-qun1,2, CHEN Hu3
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Tangshan Special Metallurgy and Material Preparation Laboratory,Tangshan 063210, Hebei, China; 3. Steelmaking Department, Shougang Jingtang United Iron and Steel Co. , Ltd. , Tangshan 063200, Hebei, China
Abstract：Based on the problems of serious material stacking in the digestion bin, high fineness rate and low compressive strength in the production line of cold-bound pellets with the production capacity of 150 000 t in an iron and steel company, the technological tests were carried out from the aspects of the modification of the square cone digestion bin, the influence of the amount of water and digestion time in the digestion process on the pulverization rate of cold-bound pellets of powder, as well as the bonding agent for the intensity of cold-bound pellets. Through the transformation of the square cone digester, the semi-clinker stored in the digester was increased from 60 t to about 100 t. When the amount of water in the digestion process was about 6%, the powder rate of the cold solid pellets reached 31.12% at the lowest. The modified starch glue was replaced by 5% sodium silicate in the binder, and the wet bulb strength increased by 3.6% and the dry bulb strength increased by 6.94%. When the carbonization time was 0-4 h, the strength of cold-fixed pellets increased significantly with the increase of carbonization time, up to a maximum of 1 200 N.
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2020, Vol. 30 
