Methods for producing polygranular graphite bodies
A method for the production of polygranular graphite bodies including the step of provisioning a mixture including a high-temperature treated anthracite having a high vitrinite content and a petroleum-based needle coke and/or a pitch-based needle coke, and provisioning at least one binder coke precursor. The method also includes the steps of forming a green body from the mixture from the provisioning step, and carbonizing and graphitizing the green body.
1. A method for the production of polygranular graphite bodies, comprising the steps of:
a) provisioning a mixture including a high-temperature treated anthracite having a high vitrinite content and at least one of a petroleum-based needle coke and a pitch-based needle coke, and provisioning at least one binder coke precursor;
b) forming a green body from said mixture provided in step a); and
c) carbonizing and graphitizing said green body from step b), wherein a share of the high-temperature treated anthracite is 2 to 30 weight-%, a share of at least one of the petroleum-based needle coke and the pitch-based needle coke is 40 to 95 weight-%, and a share of said at least one binder coke precursor is 5 to 30 weight-%.
2. The method according to claim 1 , wherein said method step c) includes a step of impregnating said green body with a pitch after carbonization and prior to graphitization.
3. The method according to claim 2 , wherein up to two steps of impregnating said green body with said pitch occur.
4. The method according to claim 1 , wherein said at least one binder coke precursor is selected from a group consisting of at least one of a pitch, a tar, a bitumen, a phenol resin, and a furan resin.
5. A method for the production of polygranular graphite bodies, comprising the steps of:
a) adding a high-temperature treated anthracite, which has a high vitrinite content, to petroleum residues or coal tar pitch in a delayed coker;
b) coking said mixture from step a) to a needle coke;
c) provisioning a mixture including the needle coke from step b) and at least one binder coke precursor;
d) forming a green body from said mixture in step c); and
e) carbonizing and graphitizing said green body in step d), wherein a share of the high-temperature treated anthracite is 2 to 30 weight-%, a share of at least one of the petroleum-based needle coke and the pitch-based needle coke is 40 to 95 weight-%, and a share of said at least one binder coke precursor is 5 to 30 weight-%.
6. The method according to claim 5 , wherein said step e) includes a step of impregnating said green body with a pitch after carbonization and prior to graphitization.
7. The method according to claim 6 , wherein up to two steps of impregnating said green body with said pitch occur.
8. The method according to claim 5 , wherein said at least one binder coke precursor is selected from a group consisting of at least one of a pitch, a tar, a bitumen, a phenol resin, and a furan resin.