Patent ID: 9708558
Date: 2017-07-18
CPC Classifications: C10B,C10L,G01N

Claim:
1. A method for preparing coal for coke making, in which an individual brand of coal or caking additive is prepared at a time prior to arrival at a coke plant, the individual brand of coal or caking additive being used alone or in mixture with another coal as a raw material for coke making, wherein, when the individual brand of coal or caking additive has a permeation distance of 15 mm or more, a size of particles of the individual brand of coal or caking additive is controlled at the time prior to arrival at the coke plant so that a content of particles having a diameter of 6 mm or more in the individual brand of coal or caking additive reaches 30% by mass or less, the permeation distance being measured by a method including the following steps (A) to (D): (A) crushing the individual brand of coal or caking additive until a content of particles having a diameter of 2 mm or less reaches 100% by mass and then packing a vessel with the individual brand of coal or caking additive that has been crushed at a bulk density of 0.8 g/cm (B) arranging glass beads having a diameter of 2 mm on the sample at a thickness of the permeation distance or more; (C) while applying a load of 50 kPa to an upper portion of the glass beads, performing heating in an inert gas atmosphere from room temperature to 550° C. at a heating rate of 3° C./min; and (D) measuring a permeation distance of the softened sample that has permeated a layer composed of the glass beads.