Carbon material production method and carbon material
A method for producing a carbon material including an oxidation step of oxidizing an ashless coal, a forming step of mixing an oxidized ashless coal obtained in the oxidation step and an unoxidized ashless coal and forming a mixture thereof, and a carbonization step of carbonizing a formed body obtained in the formation step. Percentage of increase in oxygen of the oxidized ashless coal obtained in the oxidation step is from 2.0 to 10.0%. A mixing ratio of the oxidized ashless coal in the forming step is from 60 to 95 parts by mass per 100 parts by mass of a total of the oxidized ashless coal and the unoxidized ashless coal.
1. A method for producing a carbon material, the method comprising
oxidizing an ashless coal to obtain an oxidized ashless coal;
mixing the oxidized ashless coal and an unoxidized ashless coal and forming a mixture thereof, to obtain a formed body; and
carbonizing the formed body to obtain a carbon material,
wherein:
a percentage of increase in oxygen of the oxidized ashless coal obtained in the oxidizing step is from 2.0 to 10.0%; and
the oxidized ashless coal is mixed with the unoxidized ashless coal in an amount of from 60 to 95 parts by mass per 100 parts by mass of a total of the oxidized ashless coal and the unoxidized ashless coal.
2. The method according to claim 1 , wherein the oxidation is an air oxidation.
3. The method according to claim 2 , wherein the oxidation is performed at a temperature of 150° C. or more and less than an ignition point of the ashless coal.
4. The method according to claim 1 , wherein the oxidation is performed at a temperature of 150° C. or more and less than an ignition point of the ashless coal.
5. The method according to claim 1 , wherein the oxidized ashless coal is mixed with the unoxidized ashless coal in an amount of from 80 to 90 parts by mass per 100 parts by mass of a total of the oxidized ashless coal and the unoxidized ashless coal.
6. The method according to claim 1 , wherein the percentage of increase in oxygen of the oxidized ashless coal obtained in the oxidizing step is from 4.0 to 9.0%.
7. The method according to claim 1 , percentage of increase in oxygen of the oxidized ashless coal obtained in the oxidizing step is from 6.0 to 8.5%.
8. The method according to claim 1 , wherein the oxidizing is conducted at a temperature of from 150° C. to 350° C.