Study of the kinetics of the process of producing pellets from red mud in a hydrogen flow

Abstract

The reduction kinetics of serial phase transitions of iron oxides during reduction to a metallized state with different modes of technical hydrogen supply has been studied and substantiated. The results of the pellets formation when 3-5 % molasses is added to the red mud as a binding reagent are presented. The dependences of the reduction rate of iron oxides on the hydrogen flow rate are obtained. Based on the results of the experiments, a kinetic model was constructed, and with the help of X-ray phase and spectral analysis, it was proved that the agglomerates formed after heat treatment received high strength due to the adhesion of reduced iron particles with red mud particles. The use of a new type of charge materials in melting units will reduce the amount of emissions and dust fractions, as well as increase the metal yield.

Green and low-cost synthesis of zeolites from kaolin: a promising technology or a delusion?

“…9 And in the case of the production of, for example, sodium silicate by fusion of silica sand and soda, it is associated only with the release of carbon dioxide as a result of the chemical reaction and combustion of fuel to maintain a high temperature in the glass furnace, the aluminium industry in addition to the release of carbon dioxide produces a large amount of red mud, the complete utilisation of which is still not provided by existing technologies. [14][15][16] 1.2. Kaolin as an alternative raw material for zeolite synthesis Currently, many investigations in the field of zeolite synthesis are focused on eliminating these disadvantages by using alternative natural or waste materials as raw materials.…”

“…9 And in the case of the production of, for example, sodium silicate by fusion of silica sand and soda, it is associated only with the release of carbon dioxide as a result of the chemical reaction and combustion of fuel to maintain a high temperature in the glass furnace, the aluminium industry in addition to the release of carbon dioxide produces a large amount of red mud, the complete utilisation of which is still not provided by existing technologies. 14–16…”

Influence of Background Voltage Distortion on Operation of Passive Harmonic Compensation Devices

“…Issues of improving power quality are addressed in many scientific articles by researchers from almost all countries of the world [1][2][3]. One of the main tasks within this area is to reduce the influence of harmonics on the operation of electrical equipment during the generation, transmission, distribution and consumption of electrical energy [4][5][6]. The relevance of this problem is emphasized by the significant increase in cases being considered in arbitration disputes between suppliers and consumers of electrical energy [7,8].…”

Modeling of Particle Size Distribution in the Presence of Flocculant

“…The radial thickener is a symmetrical cylindrical conical vat with a diameter of 15 m, a settling area of 177 m 2 , and an angle of inclination of the cone part of 8 • , from which it is clear that the object is characterized by a high level of inertia and lag in most control channels. The washer as a control object is also characterized by a high correlation between the input and output parameters, which makes it difficult to control under constantly acting perturbations, such as: the sludge flow rate in the thickener feed, its particle size distribution, the chemical composition, and the diameter and shape of the flocculated particles [5,6].…”