DETERMINATION OF THE ROUGHNESS IMPRINT COEFFICIENT IN COLD ROLLING WITH CONSIDERATION OF THE RELATIVE WORK ROLL SERVICE LIFE AND THE INFLUENCE OF DIFFERENT ROLLING EMULSIONS
DOI:
https://doi.org/10.32782/3041-2080/2026-7-17Keywords:
metallurgical production, iron ore raw materials, pellets, bentonite clays, binder additive, physicochemical properties, optimization, binding energyAbstract
A comprehensive analysis of the structural-mechanical and rheological properties of clay suspensions used as binding additives in the production of iron ore pellets has been conducted. The inadequacy of traditional clay evaluation based on swelling and colloidal parameters is demonstrated, and instead, an in-depth study of dynamic shear deformations, viscosity, and plasticity in the “clay–water” system is proposed. The study is based on methods of physicochemical mechanics of dispersed structures using a Weiler-Rebinder apparatus to construct time-dependent deformation curves. During the experiments, clays from the Cherkasy and Dash-Salakhlinsky deposits were classified into six structural-mechanical types based on the ratio of fast elastic, slow elastic, and plastic deformations. It was established that suspensions of bentonite from the Dash-Salakhlinsky deposit and the fourth layer of the Cherkasy deposit are characterized by high Shvedov viscosity, significant molecular interaction energy, and belong to the fourth type with a predominance of fast elastic deformations, which indicates the stability of their coagulation structure. In contrast, the montmorillonite of the second layer forms fifth-type systems with high fluidity and a low equilibrium shear modulus. It has been demonstrated that adding fourth-layer clay to montmorillonite significantly increases particle bonding energy, whereas the introduction of kaolinite acts as a plasticizer, reducing the viscosity and structural strength. The results obtained allow for the optimization of the composition of binding additives to ensure the necessary strength of green and dry pellets in metallurgical production, taking into account the rheological behavior of specific mineral mixtures
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