Effect of lime hydrate on pellet properties of fine-grained iron ore concentrates
CONG Jun-qiang1, WEN Bao-liang1, LI Jia-xin1, ZHANG Xiao-ping1,2, YANG Jia-long1
1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, Anhui, China; 2. Maanshan Iron and Steel Co., Ltd., Maanshan 243003, Anhui, China
Abstract：The pelletization of fine-grained iron ore concentrates helps to increase the development and industrial application of low-grade deposits and stabilize and expand the domestic iron ore supply sources. The use of lime hydrate as a binder and flux for pellets is of great significance to the pellet production in terms of quality improvement and consumption reduction,energy saving and emission reduction.The effect of lime hydrate ratio on the quality and drying characteristics of fine iron ore concentrate green pellets and the strength of preheated roasted pellets is introduced for the first time. The test results show that the increase of lime hydrate ratio will improve the falling and compressive strength of fine iron ore concentrate green pellets. The results of fitting Weibull and Dincer model are basically consistent with the experimental results,and the model is more effective. The fitting results show that the drying rate of green pellets is jointly controlled by internal and external moisture diffusion,and the increase of drying temperature and drying air speed will lead to the drying temperature distribution of green pellets tends to be uneven,and the activation energy value of green pellets is 9 977.30 J/(mol·K),the strength of preheated pellets of fine-grained iron ore concentrate always increases with the increase of lime hydrate ratio,and the compressive strength of roasted pellets increases first and then decreases, reaching the maximum value of 3 800 N at the ratio of 4%. The pellets of pellets prepared from lime hydrate and fine-grained iron ore concentrate with 4%-6% lime hydrate are suitable to obtain pellets with the strength of green pellets and preheated roasted pellets that meet the industrial requirements,the study on the drying characteristics of raw pellets prepared from lime hydrate and fine-grained iron ore concentrate can provide theoretical support to reduce the drying breakage of raw pellets through the selection of drying equipment and optimization of drying conditions.
从俊强, 温宝良, 李家新, 张晓萍, 杨佳龙. 消石灰对细粒级铁精矿球团性能的影响[J]. 钢铁, 2023, 58(5): 20-30.
CONG Jun-qiang, WEN Bao-liang, LI Jia-xin, ZHANG Xiao-ping, YANG Jia-long. Effect of lime hydrate on pellet properties of fine-grained iron ore concentrates[J]. Iron and Steel, 2023, 58(5): 20-30.
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