METHOD OF AUTOMATIC SLAG LAYER THICKNESS MEASUREMENT IN LADLE DURING SECONDARY PROCESSING OF STEEL Russian patent published in 2010 - IPC C21C7/72 G01F23/14 

FIELD: metallurgy.

SUBSTANCE: method involves signal measurement and dithering in time, continuous measurement of tuyere shifting aggregate carriage position in time H_K (t), determination of tuyere shifting aggregate carriage position at a time moment by H_K(t) relation and the time moment. Constant tuyere lowering rate is maintained, voltage drop in active load resistance, caused by current source connected to electric circuit between steel teeming ladle and immersion tuyere is used as base signal. Zero time moment is defined by first voltage drop at the moment of tuyere touching upper border or slag melt. From that moment on, start position H_s and end position H_e of tuyere shifting aggregate carriage position are defined at a fixed time interval A_t, and tuyere lowering rate V_t is calculated. Time signal of voltage drop in connected active load resistance is differentiated. Extremum value corresponding to time moment t_n of tuyere nozzle touching steel melt mirror which is the bottom border of slag melt is defined with the relation obtained, and slag layer thickness in ladle is calculated by multiplication of t_n and V_t.

EFFECT: enhanced processability, reduced power consumption of measurement.

2 dwg