超声波法表征烧结返矿冷压块的固结程度  

Characterization of consolidation degree for cold-bonded briquette prepared from return sinter fines with ultrasonic testing

作　　者：李映 曹懿 聂浩 韦世玉 严礼祥 于要伟 LI Ying;CAO Yi;NIE Hao;WEI Shi-yu;YAN Li-xiang;YU Yao-wei(State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Chongqing Zhenyan Energy Saving and Environmental Protection Technology Co.,Ltd.,Chongqing 400084,China)

机构地区：[1]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海市钢铁冶金新技术开发应用重点实验室,上海200444 [3]上海大学材料科学与工程学院,上海200444 [4]重庆臻焱节能环保科技有限公司,重庆400084

出　　处：《中国冶金》2022年第1期21-26,共6页China Metallurgy

基　　金：国家自然科学基金资助项目(51974182)。

摘　　要：烧结返矿通过冷压造块利用可以减少能源消耗,干燥固结会对烧结返矿冷压块性能产生显著影响。基于超声波法,定义了烧结返矿冷压块的干燥固结指数,并以其表征烧结返矿冷压块的干燥固结程度。通过测量超声波在湿态与干态烧结返矿冷压块中的传播速度和传播时间,计算烧结返矿冷压块干燥固结指数。同时,对相应的成品烧结返矿冷压块的抗压强度和落下强度进行检测,验证所定义固结指数的有效性。试验结果表明,在原料条件、混料参数和压块参数相对稳定情况下,固结指数越高,烧结返矿冷压块固结越完全,其抗压强度和落下强度越大。该方法能够快速准确表征烧结返矿冷压块干燥固结程度,为研究冷压块提供新的分析方法和质量评估指标。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.

关 键 词：超声波法 烧结返矿 冷压块 固结指数 强度 

分 类 号：TF046.4[冶金工程—冶金物理化学]