Globally, graphitized coke is primarily used in energy-intensive applications and battery technology. Increasing adoptions of electric vehicles (EVs), and renewable energies initiatives, further drive market expansion. High performing carbon materials enhance energy-storage capacity, cycling stabilities, and overall performance. In lithium ion batteries, graphitized oil coke particles can be used as cathode or anode material.
The invention discloses a method for producing graphitizable coal which, when calcined & graphitized, has a longitudinal coefficient of thermal expansion that is not substantially higher than about 0.55X10. The process involves exposing a petroleum-derived chargestock containing a highly fragrant thermal tar, and between 15% and 25% by weight, of a vacuum-reduced crude to coking temperatures and pressures. The coke made from this feedstock consists of a number planar sheets stacked with carbon that have been folded and convoluted.
This coke, after calcination has a high true density. It is also easy to graphitize. The coke has a relatively low coeflicient for thermal expansion and resistivity. It also contains a small amount of impurities including hydrocarbons, nitrogen oxides, and other impurities.
To create a finished product that can be used in nuclear reactors calcined coke undergoes a process of densifying, which involves impregnating the shaped graphite block with a density enhancer. The impregnated block is then heated to temperatures between 2500 C and 30000 C. It produces a finished graphite product with a density about 1.35-1.50 times higher than the original petroleum koke.
The improved coeflicients in terms of thermal expansion, and resistance of the graphitized carbon is advantageous for the production of electrodes used in electric arc kilns (EAF). This improved property will also be beneficial for graphite steel, electrical alloys, and other applications requiring the properties of final materials. However, the graphitized coal particles used in such applications must meet stringent performance and industry standards. This is primarily because they are subjected to harsh operating conditions in the EAF such as high temperatures and varying load levels. To ensure efficient use of EAF processes, graphitized coal particles must have a consistent distribution of particle sizes and low sulfur contents. This requires manufacturers to continue their R&D efforts in order to optimize the process of graphitization and improve the product quality. The market for graphite is highly competitive. Top players focus on improving their production techniques to maximize energy savings, reduce production cost, and meet demanding specifications from customers. This has helped to boost profitability and growth in the industry. Moreover, the growing environmental concerns have prompted companies to adopt sustainable manufacturing practices and cleaner production technologies to mitigate carbon footprints. This has led to regulatory challenges for the sector. The graphitized petroleum-coke particles market is expected to remain highly competitive in the future.
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