OPTIMIZATION OF PELLETIZING THE SINTERING MIX BY CONTROLLING THE TECHNOLOGICAL PARAMETERS

摘要

The gas permeability of the sintering mix (SM) and, consequently, the output of the sintering machine in many respects depend on the porosity of the pelletized SM bed in the drum pelletizer (DP). The effect of various technological parameters of the SM at the entry to the DP on the quality of pelletizing was studied experimentally and taken into account by a complex dynamic model [1, 2]*. To test this model under production conditions, the moisture content, particle-size distribution, equivalent diameter, porosity, bulk and apparent density of the SM at the entry and exit of the DP were investigated at the sintering plant of the Il'ich Mariupol Integrated Metallurgical Plant. In accordance with the results of the investigations, the initial SM was divided into 10 groups most characteristic for the entire range of variation of the technological parameters of the SM at the DP entry. The quantitative particle-size distribution of the mix was determined by method [2]. Considerable variations of the investigated parameters of the SM at the DP entry and exit owing to poor blending of the raw materials, poor quality of proportioning the components, and other factors were established. At the DP entry fraction 0-0.0016 m had the maximum spread and the fraction > 0.005 m had the minimum. The maximum deviation of the equivalent diameter (D_e) from the mean value was 0.0009 m and of the moisture content (W) 0.5 percent. The ratio of the number of rolling centers and pelletized particles (N_rc/N_pp) had a large spread, from 0.8 to 2.28percent. At the DP exit fraction 0.003 - 0.005 m had the maximum spread, the deviation of which from the mean value was from 1.5 to 10 percnet.