Characterization of consolidation degree for cold-bonded briquette prepared from return sinter fines with ultrasonic testing
LI Ying1,2,3, CAO Yi1,2,3, NIE Hao1,2,3, WEI Shi-yu1,2,3, YAN Li-xiang4, YU Yao-wei1,2,3
1. State Key Laboratory of Advanced Special Steel, Shanghai 200444, China; 2. Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai 200444, China; 3. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 4. Chongqing Zhenyan Energy Saving and Environmental Protection Technology Co., Ltd., Chongqing 400084, China
Abstract：Utilizing the return sinter fines by briquetting process can save a lot of fossil energy, and the property of cold-bonded briquette prepared from return sinter fines (here in after referred to as cold-bonded briquette) are deeply dependent on the consolidation process. The consolidation index of cold-bonded briquette was defined based on ultrasonic method and it was used to characterize the consolidation degree of cold-bonded briquette during the curing process. Consolidation index was calculated by testing the ultrasonic velocity and travel time in wet and dry cold-bonded briquette. At the same time, the compressive strength and drop times of cold-bonded briquettes were tested to verify the validity of defined consolidation index. Experimental results indicate that when the raw material, mixing parameters and briquette parameters are relatively stable, the higher the consolidation index is, the better the consolidation is and the greater the compressive strength and drop times of cold-bonded briquette are. This method can characterize the consolidation of cold-bonded briquette quickly and accurately, which provides an analysis method for studying cold-bonded briquette and offers a new index to evaluate the quality of cold-bonded briquette.
李映, 曹懿, 聂浩, 韦世玉, 严礼祥, 于要伟. 超声波法表征烧结返矿冷压块的固结程度[J]. 中国冶金, 2022, 32(1): 21-26.
LI Ying, CAO Yi, NIE Hao, WEI Shi-yu, YAN Li-xiang, YU Yao-wei. Characterization of consolidation degree for cold-bonded briquette prepared from return sinter fines with ultrasonic testing[J]. China Metallurgy, 2022, 32(1): 21-26.
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2022, Vol. 32 
