Tsyupa N. Development of evaluation criteria and ways to increase alkaline capacity of blast furnace slags in order to maximize the output of alkaline compounds from the blast furnace

In the dissertation is solved the actual problem of developing evaluating criteria for alkaline capacity, and methods of forming the directional properties of the alkaline-containing slags of blast furnace smelting, in order to maximize removal of alkaline compounds from the furnace, improve management efficiency of slag regime during blast furnace smelting and the technical and economic parameters of the smelting process. For the first time there was implemented a new approach to the selection of model parameters in predicting the properties of blast furnace slags, particularly, for explaining the mechanism of influence of potassium and sodium oxides on the structure and properties of blast furnace slags was scientifically substantiated selection of indicator of disequilibrium of the cation sublattice. The analytical expressions for the predicting viscosity and good flow temperature of final blast furnace slags, which contain alkaline, are based on identified patterns of influence of alkaline compounds on the technological properties of oxide systems Have obtained the development of predictive models for temperatures start (end) of the softening and melting point of the agglomerates and pellets, their performance is confirmed on the current data on the number of blast furnaces in Ukraine. Was revealed element by element influence of components of slag melt on the absorption of alkaline compounds by slag in accordance with their atomic interaction that allows to provide the selection of the optimum composition of the slag with a high ability to absorb alkaline. It was developed a parameter for the assessment of the actual concentration of alkaline oxides (K2O and Na2O) in the melted slag - "alkaline capacity", which allows you to perform an operative predictive assessment of the content of potassium and sodium oxides in the slag melt in real operating conditions of blast furnaces. The proposed method is recommended to use in industrial conditions with no control of the content of alkaline oxides in the final slag, as well as in solving problems of selection of rational composition of the charge, which provides the directional formation of products during blast furnace smelting. Has been proposed a method for the rapid assessment of the optimal alkaline capacity blast furnace slag, based on the interrelation of alkaline capacity blast furnace slag and an alkaline load. Their ratio is recommended as a criterion that makes it possible to control the accumulation of alkaline compounds in the space of a blast furnace and reasonably implement selection of control actions for timely adjustment of the composition and the weight ratio of components of the charge in order to obtain pig iron and slag optimal composition in a specific charge and technological conditions. It is applied in industry. Metallurgical industry.