Patent ID: 7328658

Claim:
A method for firing a frangible slug from an industrial ballistic tool towards the inside of a kiln to remove accumulate therefrom, the method comprising: providing a frangible slug produced by compacting and sintering a composition that consists essentially of: up to 35 percent ferrotungsten in particulate form, up to 3 percent lubricant, and the balance iron in particulate form and inevitable impurities, said frangible slug having a mass that is effective to impart kinetic energy to remove accumulate material from the inside of kilns or furnaces; and firing the frangible slug from an industrial ballistic tool towards accumulate material on the inside of a kiln, where the frangible slug is fired at a muzzle velocity of 640-700 meters per second (2100-2400 fps) at a distance of 3 to 20 meters from the accumulate material on the inside of the kiln, at which the slug will break apart into a number of pieces upon impact and reduce the propensity for damage to the kiln.