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| Preparation and production process optimization of carbon-bearing pellets for rotary bottom furnace |
| YANG Tao1,2, LEI Jie1, REN Xiao-jian3, WAN Qi-lin3, ZHOU Rong-bao3, LONG Hong-ming1,2 |
1. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, Anhui, China;
2. Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling, Anhui University of Technology, Ma’anshan 243002, Anhui, China;
3. Resource Utilization Research Office, Jiangsu Yonggang Group Co., Ltd., Zhangjiagang 215628, Jiangsu, China |
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Abstract The rotary hearth furnace direct reduction is recognized as a typical process for the treatment of iron- and zinc-containing dust sludge,due to the full utilization of iron,carbon and zinc. The metallized pellets produced by the rotary hearth furnace are available for iron and steel production and high value added resources such as zinc oxide powder are recovered. The preparation process parameters and reduction roasting system of carbon-bearing pellets were analyzed and optimized based on the actual production conditions,contributing to the promotion and improvement of the process of treating iron-bearing dust sludge in the rotary hearth furnace. The effects of pelletizing process parameters such as moisture,roll speed and pressure on the sphericity and strength of carbon-bearing pellets were revealed. The optimal results were derived at 14% mix balling moisture,6.0 r/min roller speed and 2.5×104 N/cm roller pressure. The effects of roasting temperature,roasting time and placement on the strength properties,metallization rate and dezincification rate of metallized pellets were investigated. Raising the roasting temperature and prolonging the roasting time appropriately resulted in an increase of metallic iron crystallization and a decrease of porosity. In addition,the metallic iron phase,faujasite and slag linkage were enhanced,leading to an improvement in the strength of the metallized pellets. The roasting temperature significantly affected the pellet microstructure and compressive strength. The optimal roasting temperature was 1 275 ℃ and roasting time was 25 min. The effect of placement on the properties of metallized pellets such as average compressive strength,metallization rate and dezincification rate was slight. However,the three-layer placement caused an increased difference in properties among the pellets compared to the two-layer placement.
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Received: 13 October 2022
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2023, Vol. 58 
