Regular character of pig iron desulphurization by granulated magnesium injection through two-nozzle lances into the ladles of medium sizes - A. F. Shevchenko; I. A. Manachin; B. V. Dvoskin; A. V. Ostapenko; V. G. Kisljakov; A. M. Bashmakov; S. A. Shevchenko; V. P. Petrusha (Fundamental and applied problems of ferrous metallurgy, 2017)