THE EFFECT OF THE POROSITY OF HOT-BRIQUETTED IRON ON THE RELEASE OF HYDROGEN DURING SECONDARY OXIDATION WITH WATER OF DIFFERENT TEMPERATURES

Abstract

During storage and transportation of the metallized product, moisture may enter it, resulting its oxidation occurring with the release of hydrogen. When delivering the product by sea, this can lead to fire and explosive situation. It is noted that the physicochemical properties of the metallized product, such as density, porosity, chemical composition, temperature, etc., have a great influence on the release of hydrogen. The purpose of this work is to determine the dependence of hydrogen release during iron oxidation in the metallized briquettes on their porosity and the temperature of the humidifying water. The results of study of the effect of porosity on the density of HBI are presented; the limits of changes in closed and open porosity and their effect on density were determined. It is shown that the bulk density of briquettes decreases with an increase in the porosity of HBI. The experiments were performed in order to determine the dependence of hydrogen release upon contact of briquettes with distilled water on the porosity and water temperature. It was found that with an increase in the open porosity of briquettes, their moisture saturation increases and the release of hydrogen increases. A change in the temperature of water that reacts with iron affects the release of hydrogen, but it practically does not affect the release rate within the parameters studied. When transporting the metallized briquettes it is recommended to take into account the effect of their open porosity on the intensity of hydrogen release in contact with moisture.