Evaluation of destruction processes and methods of agglomerate stabilization

Abstract

An urgent problem in today's conditions is the improvement of technology and the improvement of quality characteristics of iron ore agglomerate. The article examines the features of mechanical processing of agglomerate in various devices and analyzes the effectiveness of agglomerate stabilization in terms of strength and size in a drum-type stabilizer. It is noted that a significant drawback of this device is the lack of sufficient reasoning for the selection of structural and technological parameters of the stabilizer drum. A mathematical model was developed to study the impact of structural and technological parameters of the drum-type device on the destruction of agglomerate. The proposed model allows you to determine the characteristics of the drum, the amount and types of energy loads that act on the material at various technological and structural parameters of the device. It was determined that the load energy acting on the agglomerate depends on the following factors: the radius of the drum, the frequency of rotation, the number and width of the shelves, the degree of loading of the device with the agglomerate. It has been proven that in order to stabilize the agglomerate in terms of size and strength in a drum-type device, it is necessary to distinguish three characteristic zones with different destruction mechanisms, by reducing the size and number of shelves in them: crushing - with the maximum required amount of general and shock loads; stabilization of characteristics by size due to reduction of shock loads; abrasion, which should ensure the minimization of shock loads, with the main action of forces that will allow the removal of sharp protrusions to give the agglomerate a spherical shape. The optimal design and technological parameters of the stabilizer drum are proposed, which will allow providing the required level of initial loads on the agglomerate in the range of 60-100 J/kg with a further reduction of the energy forces to 30-40 J/kg of the agglomerate.