Analysis of technical and economic indicators of the pyrometallurgical scheme co-processing of red mud and scale

Elaboration and implementation of effective technologies of utilization of alumina production wastes (red mud) is a rather actual task. Various variants of red mud and oiled rolling scale agglomeration considered aimed at their utilization at sinter and blast furnace plants to obtain conditional marketable cast iron. As the object of the study, red mud of OJSC RUSAL and oiled rolling scale of Sinarsky pipe manufacturing plant were used. It was shown, that their joint processing enables to obtain an agglomerated product having iron content more than 50%, which meets the modern requirements to the burden materials for blast furnaces. To determine the optimal scheme of the processing in the blast furnaces, various variants of studied materials agglomeration were calculated – an oxidizing roasting to obtain pellets and briquetting with application of burnt lime as a binder. The components interrelation in the mixture was selected to have iron content in the agglomerated product high enough at maximal possible volume of red mud utilization. The calculation analysis showed that interrelation 50% of red mud and 50% of oiled rolling scale meet the requirement. Calculated blast furnace heat indicators presented while applying briquettes and pellets from red mud and oiled rolling scale in the burden.

Experimental research of gantry multirotor vibratory homogenizing mixer continuous vertically-directed action

The purpose of the work is to determine the laws that reveal the constructive, kinematic and dynamic parameters of the working vibratory homogenizing mixer on the main parameters of the mixing process.To achieve the goal, there were conducted laboratory studies based on planning and implementing a full factor experiment. Results of these studies were analyzed using the math statistics device.As a result, there were received the regression dependences of the gantry multirotor vibratory homogenizing mixer technological parameters in form of polynomials, taking into account the mutual influence of varying structural, kinematic and dynamic parameters. This allowed determining shafts rotation optimal frequency, loading intensity, the inclination angle of the working mixer's body blades. Also, it became possible to establish an optimum dynamic mode, in terms of ensuring the high quality of the mixture with sufficient performance, and the efficient value of vibration acceleration.This is the first time when for a gantry multi-rotor homogenizing mixer of continuous vertically-directed action with blade rotors that parallelly and evenly rotate towards each other, there were received math equations that take into account its constructive, kinematic, and dynamic parameters interactions, and characterize the influence degree of each of the factors on the mixture's quality and mixer's productivity.This allowed to improve the mixture of oiled rolling scale and activated peat preparation technology, before the process of sintering in ArcelorMittal Kryviy Rih agglomeration plant conditions. It also allowed to develop an engineering method for calculating and selecting the main structural and dynamic parameters of the gantry multiportal homogenizing mixer of a continuous, vertically-directed action.