Method to predict strength characteristics of briquettes obtained from dry fine-grained materials

As part of the development of the direction of the development of analytical methods for predicting the strength characteristics of briquettes obtained in the process of pressing finefraction materials, the mechanisms of interphase interactions in bulk media were analyzed, which was the basis for the formation of theoretical ideas about the formation of strength bonds in briquettes due to adhesive bonding and the creation of local model of adhesion processes for one of the basic schemes of interparticle interaction - “particle + particle”. For this model, the varieties of adhesion processes are established, and the factors that determine the occurrence and intensity of adhesive adhesion are substantiated. In laboratory conditions, experimental studies were carried out, which made it possible to assess the nature and degree of influence of the selected factors on the change in the strength characteristics of compacts. Based on the analysis of the results of experimental studies for the “particle + particle” interparticle interaction scheme, the analytical expressions for the dependence of the strength characteristics of compacts on the integral indicators of the formation of adhesive bonds, taking into account the applied pressing pressures, are established and described. The obtained dependences formed the basis of the proposed method for predicting the strength characteristics of briquettes obtained from fine-fraction materials with zero moisture content in the technological range of briquetting pressures from 50 to 220 MPa. The proposed method was used in the process of developing a technology for the production of briquettes from iron-containing waste, when performing work for a metallurgical enterprise in Ukraine, dedicated to the processing of dry dust from gas-cleaning plants in a mixture with other iron-containing waste. In particular, the method for predicting the strength of compacts was used in the analytical determination of rational force modes of pressing, ensuring the production of briquettes with the required strength.