Patent ID: 7641713
Filing Date: 2010-01-05
Classification: C21B,C21C,C22B,Y02P,Y02W

Abstract:
1. A method for reducing the chromium content in a metallurgical slag, in which the slag is charged in a liquid state onto an iron bath in a converter, comprising the steps of: a) charging a Cr-containing slag in a liquid state having a Cr content of 2 to 20% by weight onto an iron bath having a C content of below 1% by weight, b) raising the C content of the iron bath to about 2 to 4% by weight by adding carbon carriers and supplying energy, c) tapping the liquid slag, having a Cr content of about 0.1% by weight after reduction of the Cr, d) adding a cooling agent to the iron bath and lowering the C content of the iron bath to below 1% by weight, and e) tapping a portion of the Cr-containing slag in the liquid state, leaving a remaining portion of the Cr-containing slag in the liquid state in the converter for treatment of a subsequent melt.