US 12,134,736 B2
Method of producing coal blend and method of producing coke
Daisuke Igawa, Tokyo (JP); Takashi Matsui, Tokyo (JP); and Yusuke Dohi, Tokyo (JP)
Assigned to JFE Steel Corporation, Tokyo (JP)
Appl. No. 17/789,705
Filed by JFE Steel Corporation, Tokyo (JP)
PCT Filed Dec. 25, 2020, PCT No. PCT/JP2020/048673
§ 371(c)(1), (2) Date Jun. 28, 2022,
PCT Pub. No. WO2021/140947, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 2020-000716 (JP), filed on Jan. 7, 2020.
Prior Publication US 2023/0051325 A1, Feb. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C10B 57/04 (2006.01); C10L 5/04 (2006.01)
CPC C10B 57/04 (2013.01) [C10L 5/04 (2013.01); C10L 2290/60 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of producing a coal blend by blending plural brands of coal to produce a coal blend, the method comprising:
where γ100 is a surface tension of coal having 100% inert material, and where γ0 is a surface tension of coal having 100% reactive material,
determining a range of γ0 for each of the plural brands of coal;
among brands of coal 1, 2, . . . i, . . . , and n to be blended in a coal blend, identifying each coal i in which γ100 is outside-of the range of γ0;
measuring TI of coal i, wherein TI is a total inert material specified in JIS M 8816 and indicates the proportion (vol %) of inert material contained in coal i;
determining a blending ratio of coal i such that w calculated by formula (1) is 20.4 mass % or less,
w=Σ(xi×TIi)  (1)
wherein xi is the blending ratio (mass %) of coal i, TIi is a fraction (vol %) of the inert material contained in coal i, and w is the mass fraction (mass %) of the inert material of the coal different than γ0 in the coal blend;
forming the coal blend by blending the plural coals based on the determined blending ratio; and
producing coke by carbonizing the coal blend, wherein the produced coke has higher strength compared with coke not blended by the determined blending ratio.