Method for producing modified coal, and modified coal

Patent metadata

Field	Value
Publication number	US-9994783-B2
Application number	US-201414917499-A
Country	US
Kind code	B2
Filing date	Sep 9, 2014
Priority date	Oct 1, 2013
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

A method for producing modified coal using coal of a low grade comprising:
adding water for preventing any dust generation to the dewatered coal; an addition amount of the water is adjusted for a water content rate of the water-added coal to be 6% by mass or more to 16% by mass or less; agglomerating the water-added coal; slowly oxidizing the agglomerated coal; and crushing the oxidized coal.

First claim

The invention claimed is:

1. A method for producing modified coal, comprising:
dewatering low grade coal to produce dewatered coal;
adding water to the dewatered coal to produce water-added coal;
agglomerating the water-added coal to produce agglomerated coal;
slowly oxidizing the agglomerated coal to produce oxidized coal; and
crushing the oxidized coal to produce crushed coal,
wherein:

in adding the water to the dewatered coal, an addition amount of the water is adjusted such that a water content of the water-added coal is 6% to 16% by mass, and
said method further comprises secondarily adding water to the crushed coal.

2. The method according to claim 1 , wherein
in adding the water, the addition amount of the water is adjusted such that the water content of the water-added coal is 6% to 16% by mass and a water content of the crushed coal is 10% to 16% by mass.

3. The method according to claim 1 , wherein
in adding the water, the addition amount of the water is adjusted such that the water content of the water-added coal is 6% to 12% by mass, and wherein
in secondarily adding the water, the addition amount of the water is adjusted such that a water content of the crushed coal is 10% to 16% by mass.

4. The method according to claim 1 , wherein
in adding the water, a portion or all of the water is added to the dewatered coal by adding low grade coal to the dewatered coal.

5. The method according to claim 1 , wherein
in adding the water, the addition amount of the water is adjusted such that the water content of the water-added coal is 8% to 15% by mass and a water content of the crushed coal is 11% to 15% by mass.

6. The method according to claim 1 , wherein an upper limit of the oxygen consumption rate of the oxidized coal is 2 mg/g/day.

7. The method according to claim 1 , wherein an upper limit of the oxygen consumption rate of the oxidized coal is 1.5 mg/g/day.

8. The method according to claim 1 , wherein
in adding the water, the addition amount of the water is adjusted such that the water content of the water-added coal is 6% to 10% by mass, and wherein
in secondarily adding the water, the addition amount of the water is adjusted such that a water content of the crushed coal is 10% to 16% by mass.

9. The method according to claim 1 , wherein an upper limit of the oxygen consumption rate of the oxidized coal is 1.5 mg/g/day.

10. The method according to claim 1 , wherein an upper limit of the oxygen consumption rate of the oxidized coal is 1 mg/g/day.

11. The method according to claim 1 , wherein an upper limit of the oxygen consumption rate of the crushed coal is 2 mg/g/day.

12. The method according to claim 1 , wherein an upper limit of the oxygen consumption rate of the crushed coal is 1.5 mg/g/day.

Assignees

• Kobe Steel Ltd

Inventors

• Yamamoto Seiichi
• Shigehisa Takuo
• Watanabe Naoto

Classifications

• C10L9/06 Primary

  by oxidation · CPC title

• C10L2290/28

  Cutting, disintegrating, shredding or grinding · CPC title

• C10L2290/146

  of water · CPC title

• C10L5/366

  Powders · CPC title

• C10L5/24 Primary

  Combating dust during {shaping or} briquetting; Safety devices against explosion · CPC title