Coal processing is the most effective method for removing unwanted minerals and pollutants from coal, and there are several techniques for it including physical, chemical and physicochemical separation.
Among various physical separation methods, the selective crushing separation is a promising method for reducing specific energy consumption during the early stages of classification and for treating low-grade ores and tailings disposal.
Currently, toothed roll crushers are commonly used in various stages of mineral processing. The toothed roll crushers can be designed to be with either a single toothed roll or a double toothed roll.
The selective crushing device with hanging rings and a toothed roll is a kind of a single toothed roll crusher in which many hanging rings are supported by the supporting structure including a beam and a supporting rod. The supporting structure for hanging rings not only stands the weight of the rings and the dynamic loads during crushing processes but also constricts the freedom degree of the rings. The supporting structure may have a great influence on the crushing performance of this selective crushing device.
Jon Chol Min, a researcher at the Faculty of Mining Engineering, has proposed a new type of toothed roll based selective crushing device, and investigated the effect of the supporting structure to improve the crushing performance of the device.
The analytical result of the interaction of hanging rings and feed particles shows that the placement of the supporting rod has the greatest influence on the interaction force, and that the placement angle of the supporting rod for hanging rings is a critical design parameter for the improvement of crushing performance of the selective crushing device.