BASIC CHARACTERISTICS AND BALLING PERFORMANCE OF ZINC-BEARING DUST IN STEEL PLANT

In the present work，the basic characteristics of zinc-bearing dust，including sintering，blast furnace and electric arc furnace dust，were investigated through the chemical analysis，laser particle size，X-ray diffraction，scanning electron microscopy and infrared spectrum． Furthermore，the pelletizing experiment of mixed dust was carried out，and the optimal pelletizing parameters were investigated based on the balling dynamics and the green pellet strength． The results showed that the mass fraction of total Fe in three zinc-bearing dusts were all high with the different mineral forms． In addition，the mass fraction of C in the blast furnace dust was up to 21. 44%，and that of Zn in the electric furnace dust was up to 6. 63%． On the other hand，in order to improve the pellet yield and quality simultaneously，the optimal pelletizing parameters of mixed dust should be controlled as follows: Moisture content 11. 25% ～ 11. 75%，bentonite content 2%，pelletizing time 20 min，disk rotational speed 27 ～ 31 r /min，feeding amount 5 kg．