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为减少酒钢0~15 mm镜铁矿粉矿中细粒级粉矿含量,改善回转窑磁化焙烧效果,研发了一种多辊分级装置,并用其进行了设备及工艺参数优化试验。试验表明,该多辊分级装置可高效分离出物料中细粒级部分,在同一等级处理量内,随着装置倾角以及物料水分含量的增加,分级效率降低;随着随辊缝尺寸以及分级物料粒度的增加,分级效率提高。在辊面倾角为30°、预分级物料含水量控制在5.40%以内时,可对物料进行有效分离,在一定年处理量条件下可保证分级效率达80%以上;欲对同一物料进行多段分级,则各级装置的辊数应呈一定比例。
In order to reduce the content of fine-grained powder ore in 0-15 mm specular iron ore ores and improve the magnetization roasting effect of rotary kiln, a multi-roll grading equipment was developed and used to optimize equipment and process parameters. The test shows that the multi-roll classification device can effectively separate the fine fraction in the material, and the classification efficiency decreases with the inclination of the apparatus and the moisture content of the material within the same level of throughput. With the roll gap size and graded material Increase the granularity, classification efficiency. When the roll angle is 30 ° and the water content of pre-classification material is controlled within 5.40%, the material can be effectively separated, and the classification efficiency can be guaranteed over 80% under a certain annual throughput; , Then the number of devices at all levels should be a certain percentage.