Abstract
A research on the influence of water distribution between mixing and pelletizing operations on gasdynamic properties of sinter charge, agglomeration process indicators and quality of iron ore sinter for the compositions of the sinter blends used at the sinter plants of PJSC “MMK” was carried out at the laboratory of the metallurgy and chemical technologies department of Nosov Magnitogorsk State Technical University. A rational proportion between water consumption rates in the mixing and pelletizing drums during mixing and pelletizing operations was established equaling to 80:20 at the charge moisture of 9.5 %. This proportion provided higher green pellets strength indicators. The yield of +5 mm pellets after 10 drops of the green pellets of 5-12 mm size from a height of 300 mm was 47.5 % that is 15.5 % (rel.) higher than the average value of the yield of suitable sinter which was obtained in the experiments at the ratio between water consumption rates in mixing and pelletizing operations of 90:10; 60:40; 40:60; 20:80, and 0:100. The rational proportion between water consumption rates in the mixing and pelletizing operations of 80:20 provided the highest specific productivity (by the +5 mm particle size class) equaling to 1.442 tm-2h-1 while sintering pelletized sinter charge. This value is 3.7 % higher than the average specific productivity value obtained in the experi-ments which were carried out at the following ratios between water consumption rates in the mixing and pelletizing operations: 90:10; 60:40; 40:60; 20:80, and 0:100 %.
Keywords:
Sintering, sinter, grain size of pelletized charge, pelletizing, moisture content of sinter charge, shrinkage, specific productivity