Process and plant for producing steel

Abstract

A process for producing steel and for obtaining slag having a high content of additional elements such as vanadium in a two-step process. Liquid pig iron is initially blown onto a high-grade slag at a lower temperature, the slag being further processed separately after tapping, while the pig iron is supplied to at least one additional converter in which it is blown at a higher temperature to form steel. A high-grade slag is generated while shortening the steel production process using the process in that the intermediate metal product that is tapped from the first converter is subjected to a heating and/or holding phase before being supplied to the second converter.

1 .- 5 . (canceled) 
     
     
         6 . A process for producing steel and obtaining slag having a high content of additional elements comprising:
 blowing liquid pig iron onto a high-grade slag at a first temperature in a first converter;   tapping an intermediate metal product from the first converter;   subjecting the intermediate metal product to at least one of a heating and a holding phase;   tapping the slag from the first converter   processing the slag after tapping; and   supplying the pig iron intermediate metal product to at least one additional converter in which it is blown at a second temperature to form steel, the second temperature being greater than the first temperature   
     
     
         7 . The process according to  claim 6 , wherein the intermediate metal product is heated during the holding phase by injecting oxygen. 
     
     
         8 . An apparatus for producing steel and obtaining slag having a high content of additional elements comprising:
 a transfer vessel configured to transfer an intermediate metal;   a first converter for blowing liquid pig iron;   at least one second converter for producing crude steel configured to receiving the intermediate metal product tapped from the first converter; and   a heating stand configured to station the transfer vessel transferring the intermediate metal product from the first converter to the at least one second converter.   
     
     
         9 . The apparatus according to  claim 8 , wherein the heating stand is configured to receive a plurality of transfer vessels. 
     
     
         10 . The apparatus according to  claim 8 , further comprising a device for injecting oxygen into the transfer vessel when the transfer vessel is stationed at the heating stand. 
     
     
         11 . The apparatus according to  claim 8 , wherein the vessel comprises a cover. 
     
     
         12 . The apparatus according to  claim 10 , wherein the device for injecting oxygen into the transfer vessel is a lance. 
     
     
         13 . The process according to  claim 6 , wherein the additional elements comprise vanadium. 
     
     
         14 . The process according to  claim 6 , wherein the first temperature is about 1400 degrees Celsius. 
     
     
         15 . The process according to  claim 6 , wherein the second temperature is about 1680 degrees Celsius. 
     
     
         16 . The process according to  claim 7 , wherein the injected oxygen is metered. 
     
     
         17 . The apparatus according to  claim 8 , wherein the heating stand is located between the first converter and the at least one second converter.