Patent ID: 8142543
Filing Date: 2012-03-27
Classification: C21C,C22C

Abstract:
1. A method of refining a ferroalloy, comprising blowing a gas selected from molecular oxygen and a gas mixture including molecular oxygen into a melt of the ferroalloy and exothermically reacting the molecular oxygen with carbon in the melt; introducing a metallurgically acceptable particulate material, capable of providing a cooling effect, from above into the melt in a first supersonic gas jet which travels to the melt shrouded by a second supersonic gas jet, wherein the second supersonic gas jet is formed of burning gases; and forming velocities of the first and the second supersonic gas jets for controlling migration of said particulate material between said first and second supersonic gas jets, the velocity of the second supersonic gas jet being from 10% less to 10% greater than the velocity of the first supersonic gas jet.