Method for producing metallurgical coke from non-coking coal

Patent metadata

Field	Value
Publication number	US-11242490-B2
Application number	US-201916966954-A
Country	US
Kind code	B2
Filing date	Feb 6, 2019
Priority date	Feb 6, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

The present disclosure relates to a method for producing metallurgical coke from non-coking coal. The method comprising, densifying, the non-coking coal to form pellets. The densified pellets will be placed in a microwave oven within plurality of bricks and are subjected for pyrolysis. For carrying our pyrolysis, the pellets are carried out by heating, the pellets in the microwave oven at a predetermined temperature under an inert atmosphere at atmospheric pressure, and then the pellets are cooled in the microwave oven under the inert atmosphere. This process coverts non-coking coal to the metallurgical coke in a quicker time, and without use of any susceptors.

First claim

The invention claimed is:

1. A method for producing metallurgical coke from only non-coking coal, the method comprising:
densifying the non-coking coal to form pellets ( 11 );
placing the pellets ( 11 ) in a microwave oven ( 1 ) within a plurality of bricks ( 4 );
heating the pellets ( 11 ) in the microwave oven ( 1 ) at a predetermined temperature under an inert atmosphere at atmospheric pressure, wherein the pellets ( 11 ) undergo pyrolysis during the heating; and
cooling the pellets ( 11 ) in the microwave oven ( 1 ) under the inert atmosphere, to convert the pellets ( 11 ) of the non-coking coal to the metallurgical coke;
wherein heating of the pellets ( 11 ) in the microwave oven ( 1 ) is carried out without susceptors.

2. The method as claimed in claim 1 , wherein densifying the non-coking coal, includes:
crushing the non-coking coal to form crushed non-coking coal; and
compacting the crushed non-coking coal to form the pellets ( 11 ).

3. The method as claimed in claim 2 , wherein the crushing of the non-coking coal is carried out in a hammer mill, or a pulveriser mill, wherein the crushed non-coking coal has 80% to 90% fineness.

4. The method as claimed in claim 2 , wherein compacting of the crushed non-coking coal is carried out in a press, wherein the compacted density of the pellets ( 11 ) is in the range of 1100 kg/m 3 to 1150 kg/m 3 .

5. The method as claimed in claim 3 , wherein a binder is used in compacting of the crushed non-coking coal to form the pellets ( 11 ).

6. The method as claimed in claim 1 , wherein the inert atmosphere is created by purging inert gas into the microwave oven ( 1 ).

7. The method as claimed in claim 6 , wherein the inert gas is purged into the microwave oven ( 1 ) before heating of the pellets ( 11 ) and during heating of the pellets ( 11 ), at a flow rate ranging from 60 litres/minute to 90 litres/minute for a time period ranging from 3 minutes to 8 minutes.

8. The method as claimed in claim 1 , wherein the pellets ( 11 ) are subjected to cooling in the microwave oven ( 1 ) under the inert atmosphere at a rate of 51/min to 201/min.

9. The method as claimed in claim 1 , wherein the heating is carried out at a microwave power intensity in the range of 2 kW to 8 kW for a time period ranging from 10 minutes to 40 minutes.

10. The method as claimed in claim 1 , wherein the predetermined temperature ranges from 900° C. to 1100° C., increasing at a rate of 40° C. to 60° C. per minute.

11. The method as claimed in claim 1 , wherein density of the metallurgical coke produced by the method is in the range of 380 kg/m 3 to 440 kg/m 3 .

12. A metallurgical coke formed from the method as claimed in claim 1 .

Assignees

• Tata Steel Ltd
• Univ Nottingham

Inventors

• Das Bidyut
• Chandra Sanjay
• Pal Atanu Ranjan
• Dash Pratik Swarup
• Sudan Munish
• Binner Eleanor
• Dodds Christopher
• Lester Edward Henry
• Williams Orla
• Kingman Samuel

Classifications

• C10B19/00 Primary

  Heating of coke ovens by electrical means · CPC title

• C10B53/08 Primary

  in the form of briquettes, lumps and the like · CPC title