Jfe Steel Corporation

Mikiya Nagayama

Takashi Matsui

Yusuke Dohi

Kiyoshi Fukada

Narumi Nanri

Kazutoshi Hanada

Michio Honma

Masahiro Shinohara

A method of producing a coal mixture includes blending a plurality of coals, wherein formula (1) and formula (2) are satisfied: α≤1.2×10(mol/g-coal)  (2)wherein αis a hydrogen ion release capacity per unit mass (mol/g-coal) of the coal mixture, αis the hydrogen ion release capacity per unit mass (mol/g-coal) of a coal i, xis a blending ratio of the coal i blended in the coal mixture, and N is a total number of brands of coal contained in the coal mixture.

Method of producing coal mixture and method of producing coke

A method for accurately measuring the thermoplasticity of a coal whose thermoplasticity has been difficult to evaluate and determining whether the coal that is to be measured does not significantly reduce the coke strength when used for a coal blend is disclosed. Also disclosed is a method for evaluating a coal used as a raw material for coke and includes using a physical property value relating to a thermoplasticity of a coal as an index for evaluating the coal, wherein a primary or secondary amine including an aromatic ring have been added to the coal, thereby enhancing the thermoplasticity of the coal.

Evaluating method for coal and producing method for coke

A coal mixture is provided that maintains a high level of coke strength after carbonization, even where coal having an excessively large permeation distance is used in a large amount. The coal mixture includes large-permeation-distance coal and permeation-distance-decreasing coal. The permeation-distance-decreasing coal has a mean maximum vitrinite reflectance Ro of 1.25% or more and a total inert amount TI of 30 vol. % or less. The blending ratio of the permeation-distance-decreasing coal in the coal mixture is in a range derived by multiplying the blending ratio of the large-permeation-distance coal by 0.25 or more and 3.0 or less.

Coal mixture, method for manufacturing coal mixture, and method for manufacturing coke

A coke manufacturing method includes preparing blended coal by blending coal of at least two types, stirring and mixing the blended coal so as to disintegrate at least a part of pseudo-particles in the blended coal that have been formed by agglomeration of coal particles, and charging the blended coal after stirring and mixing into a coke oven and carbonizing the blended coal so as to manufacture coke.

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Fukuyama, Japan

Mikiya Nagayama