EFFECTIVE USE OF PISOLITE ORES BASED ON STRUCTURE DESIGN OF THE QUASI-PARTICLES IN SINTERING PROCESS

To use pisolite ores as raw materials in iron ore sintering process, s ome effective utilization methods were investigated. Main results obta ined are summarized as follows: (1) With increase in the pisolite ores in the raw materials, productivity and yields of the sinter products become worse; on the other hand reducibility and reduction degradation index of the products are improved. (2) For the purpose of improving the properties of the sinter products, it is most favorable to make qu asi-particles having duplex structures;inner core is granulated by the raw mixture containing the pisolite ores and outer shell is coated wi th fine coke and high grade iron ore fines. (3) In addition to the mak ing of quasi-particles with the duplex structure, segregation charge o f the coke breeze in the sintering bed further improves the productivi ty and shatter strength of the products. (4) Improved properties of th e products, such as reducibility and reduction degradation are attribu ted mainly to the sinter structures and mineral phases constituting th e microstructures.