US 12,215,395 B2
Method for recycling chromium oxide and forming chromium-alloy steel
Mansour Nasser Alharbi, Jubail (SA); Sami Muteib Almutairi, Jubail (SA); and Malleswara Rao Tadiboyina, Geleen (NL)
Assigned to SAUDI IRON AND STEEL COMPANY (HADEED), Jubail Industrial (SA)
Appl. No. 17/432,370
Filed by SABIC Global Technologies B.V., Bergen op Zoom (NL)
PCT Filed Mar. 17, 2020, PCT No. PCT/IB2020/052429
§ 371(c)(1), (2) Date Aug. 19, 2021,
PCT Pub. No. WO2020/201869, PCT Pub. Date Oct. 8, 2020.
Claims priority of provisional application 62/827,543, filed on Apr. 1, 2019.
Prior Publication US 2022/0170124 A1, Jun. 2, 2022
Int. Cl. C21C 7/00 (2006.01); C21C 5/52 (2006.01); C21C 5/54 (2006.01); C22C 33/06 (2006.01); C22C 38/18 (2006.01)
CPC C21C 7/0006 (2013.01) [C21C 5/5264 (2013.01); C21C 5/54 (2013.01); C21C 7/0075 (2013.01); C22C 33/06 (2013.01); C22C 38/18 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A process for recycling chromium oxide and forming chromium-alloy steel, the process comprising:
adding a first composition comprising chromium oxide to a second composition comprising molten steel; and
reducing the chromium oxide at a temperature of 1200 to 2000° C. to form metallic chromium, wherein the metallic chromium gets mixed with the molten steel to form chromium-alloy steel;
wherein the first composition comprises 10 to 25 wt. % Cr2O3 and 70 to 85 wt. % alumina.