ELECTRIC FURNACE STEELMAKING PROCESS USING OXIDE OF BORON ADDITIVE

• US 3,809,547 A
• Filed: 12/22/1970
• Issued: 05/07/1974
• Est. Priority Date: 12/22/1970
• Status: Expired due to Term

• Current Assignee: Flintkote Co.
• Original Assignee: Bruski R, Lewis C
• Inventors: LEWIS C, BRUSKI R
• Application Number:
  US05/100,820
• Time in Patent Office: 1,232 Days
• US Class Current: 75/10.16
• CPC Class Codes: C21C 5/52 Manufacture of steel in electric furnaces C21C5/005 takes precedence; electric heating per se H05B
• CPC Class Codes: Y02P 10/20 Recycling

Abstract

THE RATE OF DISSOLUTION OF LIME IN THE SLAG OF A BASIC ELECTRIC STEELMAKING FURNACE IS ACCELERATED BY CHARGING TO THE SLAG A BORON-CONTAINING COMPOUND, PARTICULARLY ONE THAT PROVIDES AN OXIDE OF BORON, ESPECIALLY B2O3, UNDER THE OPERATING CONDITIONS PREVAILING IN THE ELECTRIC FURNACE. ILLUSTRATIVE OF SUCH ADDITIVE COMPOUNDS ARE BORON TRIOXIDE, BORIC ACID, ANHYDROUS SODIUM TETRABORATE (BORAX), CALCIUM METABORATE, CALCINED AND UNCALCINED COLEMANITE AND RASORITE. THE ADDITIVE PREFERABLY IS DELIVERED TO THE SLAG EITHER IN INTIMATE MIXTURE WITH THE LIME OR SEPARATELY BUT SUBSTANTIALLY SIMULTANEOUSLY WITH THE ADDITION OF THE LIME.

Claims