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| Optimization of pretreatment process of pelletizing raw materials in belt roasters |
| LIU Shanping1, MA Lei2,3, SONG Yunfeng1, GUO Gang1, LEI Jie2, LONG Hongming2,3 |
1. Manufacturing Department, Maanshan Iron and Steel Group, Maanshan 243032, Anhui, China;
2. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, Anhui, China;
3. Key Laboratory of Metallurgical Engineering and Resource Utilization in Anhui Province, Anhui University of Technology, Maanshan 243032, Anhui, China |
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Abstract Belt roasting machine is one of the production processes of single-large-scale pellet. The reasonable collocation of raw material pretreatment processes such as high pressure grinding rolls and strong mixing is an effective means to expand the adaptability of raw materials, reduce bentonite consumption and improve the quality of pellets. In response to the problems of excessive roller mill pressure and low raw material handling coefficient in the raw material pretreatment process of belt roasting machine in an iron and steel enterprise, the industrial tests of high-pressure roller mill coupling with powerful mixing were carried out to reveal the influence law of process parameters such as roller pressure strength and feeding volume on the sphericity and strength of pellets to provide theoretical guidance for improving quality and reducing consumption in pelletizing. The results showed that the feeding quantity and pressure of the roller mill had an effect on the particle size and specific surface area of raw materials. With the reduction of the feeding quantity or the increase of the roller pressure, the particle size of raw materials was finer and the specific surface area were lager. When the loading volume was 500 t/h and the roll pressure was 90 MPa, the proportion of the mixture with a particle size less than 44 μm increased from 72.20% before roller grinding to 83.94%, and the proportion of particle size less than 74 μm increased from 89.96% before roller grinding to 95.82%. After strong mixing, the proportion of 0.044 mm和0.074 mm particle size was basically unchanged, but the particle size distribution was more balanced. After the combination of bentonite and water, the lager molecular force provided by the capillary water and molecular water were substantially increased, resulted that the surface of large particles adhere to more fine particles. The specific surface area increased from 922.88 cm2/g before roller grinding to 1 411.15 cm2/g, and the sphere-forming performance was improved. When the pretreated raw material was applied to production, the green pellet falling strength was 5.0-7.0 times/(0.5 m). Meanwhile, the bentonite consumption was reduced by 2-3 kg/t and the iron grade was increased by 0.05%-0.16%, which significantly improved the quality and production efficiency of pellet in belt roasting machine.
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Received: 06 December 2022
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2023, Vol. 58 
