| Hybrid pelletized sintering process is a new agglomerating method developed from conventional sintering and pelletizing, fine ore can be used in large quantity as raw materials for this process. In order to solve the problem of unproper segregation feeding methods in old design of acid hybrid palletized sinter process in Jiuquan Iron and Steel Corporation (JISCO), much site investigation and laboratory investigation work were carried out.The original sinter-bed permeability of acid pelletized sintering and the permeability in sinter processing were measured. Particle-size and carbon distribution in sinter-bed in old design were investigated. In order to founding the proper carbon profile and particle-size profile in sinter-bed, some pot tests were also carried out in φ 300mm sintering pot. In accordance with the conclusion of pot tests, the distribution process of site was improved. At last, some modification was carried out which is about the distributor of acid hybrid pelletized sinter and conventional sinter. Following conclusions are obtained:1.Based in the studying of sinter-bed permeability of acid pelletized sintering and the permeability in sintering processing, particle-size and carbon distribution, it is found that unreasonable collocation process is a main influence factor to technical-economic index.2. Based on pot tests with different carbon profile in sinter-bed, it is found that suitable degree of carbon segregation in three-layer is 0.4%.3. The wide range of particle size of mixture in acid pelletized sintering(the contentof 5~10 mm gets up to 80%) and carbon content induced to unproper carbon segregation, traditional distribution process is not suited for acid pelletized sintering in JISCO.4. Different segregation feeding methods result in different carbon profile in three-layer. Wheel segregation feeding method is suitable for acid pelletized sintering.
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