Title:
METHOD FOR PRODUCING STEEL BY USING WASTE LOW-GRADE ORE INSTEAD OF RICH IRON ORE AS RAW MATERIAL
Document Type and Number:
WIPO Patent Application WO/2023/184811
Kind Code:
A1
Abstract:
A method for producing steel by using a waste low-grade ore instead of a rich iron ore as a raw material, comprising the following steps: using a waste low-grade ore instead of a conventional rich iron ore as a raw material, wherein the waste low-grade ore comprises the following components in percentage by weight: TFe: 30-49.5%; Cr: 0.7-2.2%; Ni: 0.5-1.5%; Al2O3: 4.5-9%; SiO2: 4-37%; CaO: 0.18-1.4%; MgO: 0.8-23%; MnO: 0.5-2.3%; S: 0.01-0.3%; P: 0.008-0.05%; and water: 8-40%; sintering the raw material to obtain a sintered ore; adding coke for blast furnace smelting on the sintered ore to obtain chromium and nickel containing molten iron and by-product slag; and carrying out smelting in an electric arc furnace or a converter, and carrying out decarburization, dephosphorization, deoxidization, and desulfurization to directly obtain a chromium and nickel containing billet. The step of adding, during a steelmaking process using molten conventional rich iron ore, a silicon-manganese alloy and a nickel-chromium alloy in order to meet requirements of finished steel is omitted.
Inventors:
DONG CHENGZHEN (CN)
Application Number:
PCT/CN2022/109556
Publication Date:
October 05, 2023
Filing Date:
August 01, 2022
Export Citation:
Assignee:
GONGYI DONGSHI FORMWORK CO LTD (CN)
International Classes:
C22B1/16; C21B5/00; C22C33/04; C22C38/02; C22C38/04; C22C38/40
Foreign References:
| CN114717411A | 2022-07-08 | |||
| CN102321849A | 2012-01-18 | |||
| CN102220484A | 2011-10-19 | |||
| CN101469391A | 2009-07-01 | |||
| CN101092656A | 2007-12-26 | |||
| CN1847440A | 2006-10-18 | |||
| CN101445845A | 2009-06-03 |
Attorney, Agent or Firm:
BEIJING YUNJIA PAIFU INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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