Patent UA-97754-C2 (UA)
Title: repair method for the converter lining and skull tuyere for realization thereof
Inventor: CHERNIATEVYCH ANATOLII HRYHOROVYCH
IPC: C21C5/44
Filed: 2011-01-17
Abstract: A group of inventions relates to the field of ferrous metallurgy, in particular to a method for repair of lining and structure of the skull tuyere for realization thereof. The method for repair of converter lining involves leaving in the converter of the lining in converter of the remaining slag of the preliminary melting, application on the lining of the slag skull by the means of the rotating skull tuyere with nozzles at varying height of the tuyere and change of the direction of jets rotation into the opposite after each turn of the tuyere at 180 ° around the vertical axis by blowing the slag bath with air jets that carry powderlike raw dolomite in the circular shell of nitrogen in the range of 10-90 % of the slag blowing time, at that blowing of the slag bath with air jets is carried out through a single nozzle with their intensity of 0.14-0.18 m/min. per tonne of the liquid steel, which carry powdered raw dolomite with the intensity of its supply through a single nozzle of 0.3- / min. per tonne of the liquid steel in circular shells of oxygen and nitrogen from the intensities of their supply through one nozzle of 0.21-0.43 and 0.86-0.93 and m/min. per tonne of liquid steel, respectively, at that oxygen is supplied in the range of 45-100 % of the time of slag blowing.The skull tuyere for the converter lining repair includes a mobile driving platform with the vertical guide, its carriage and the rotation mechanism, which provides a change of the direction of rotation opposite to each turn of tuyeres 180 ° around the vertical axis, a shaft of the skull tuyere made of two collectors and two concentrically located inner and outer pipes, which form the paths for nitrogen and gun-mass supply in the air stream, the end head nozzle tuyere, which is made from the top distributor and the bottom plate that are hermetically connected to the inner and outer pipes of the shaft of the skull tuyere, respectively, the bodies of the cylindrical nozzles and Laval nozzles are mounted to the top distributor and bottom plate, respectively, and are disposed concentrically with the circular gap between the overhand of a Laval nozzle more than the plate end, centered between the outer surface of the top distributor and the inner surface of the lower plate the cylinder fixator with different diameters in height, which end with a smaller diameter is fixed on the upper distributor, at that the shaft of the skull tuyere additionally contains a collector and an intermediate pipe, with the formation of oxygen supply path to the end head nozzle, and this end nozzle is made with additional intermediate plate, in bodies of additional cylindrical nozzles for oxygen supply are fixed, in which concentrically with annular gap with combining of the original sections cylindrical nozzles of the gun-mass in the air flow supply are inserted, at that they are combined in the end of the cylindrical nozzles inserted concentrically with the annular gap into the Laval nozzle for nitrogen supplying and they are placed at their critical section level and the end of the cylindrical fixator with a smaller diameter is set in the orifice of the bottom plate with the overhand more than its edge and with the possibility to move freely. The invention decreases costs of the gunning body of refractories, increases the degree of assimilation by the slag of this mass of refractories, adjusts the chemical composition of the final slag and skull application at the converter lining.