Back to results
US 2018/0023004 A1Published application
Method of producing needle coke for low cte graphite electrodes
AssigneeGrafTech International Holdings Inc.
InventorsDouglas J. Miller, Irwin C. Lewis, Ching-Feng Chang, Richard Thomas Lewis
Life of this patent
Estimating the term…
Abstract
A method of producing low CTE graphite electrodes from needle coke formed from a coal tar distillate material having a relatively high initial boiling point.
Claims16
A method of creating a low coefficient of thermal expansion graphite electrode, comprising:
- (a) heating a needle coke precursor comprising at least 80% coal tar distillate having a boiling point of greater than 280° C. under pressure, thereby converting 60-90% of the coal tar distillate into raw coke;
- (b) calcining the raw coke to create low coefficient of thermal expansion needle coke;
- (c) milling the needle coke;
- (d) mixing the milled needle coke with coal tar binder pitch to create a mix;
- (e) extruding the mix to form a green electrode;
- (f) baking the green electrode to create a baked electrode;
- and
- (g) graphitizing the baked electrode to create a low coefficient of thermal expansion graphite electrode.
5 more elements
Dependencies are inferred from the claim text.