In a steel manufacturing process petroleum coke, or petcoke, plays an essential role. It is a byproduct of oil refining and the result of heating large chunks of crude oil in an oxygen-free chamber where hydrocarbon molecules break down into smaller ones that can be separated from each other through distillation. The product is dense, black and brittle with a high fixed carbon content. It also contains volatile matter in proportions of less than 10% and metals such as aluminium, vanadium, iron, and chromium, depending on the refining process used to produce it.
On a dry basis, petroleum coke is composed of 85% to 90% fixed carbon, sulfur (.05% to 6%), nitrogen (2% to 4%), and a variety of other metals such as vanadium, iron, and chromium. It is a solid with a hard, brittle texture that can be broken into smaller fragments by physical methods such as grinding or crushing. It can be produced in two distinct forms: uncalcined and calcined. Uncalcined petroleum coke has a higher volatile matter concentration and is soft with a greasy feel to the touch, while calcined petcoke is harder with a matte, slate-like texture.
Uncalcined petcoke is used in a variety of industrial applications including fuel, carbon anode material for electrolytic cells, and in the production of graphite electrodes, which are essential components for manufacturing lithium-ion batteries for electric vehicles. It also acts as a carbon raiser in the production of molten steel in electric arc furnaces and basic oxygen furnaces, increasing the level of carbon in the iron to make it stronger and more durable.
Petroleum coke also acts as an energy resource in direct reduction ironmaking, replacing coal and minimizing the formation of slag in the production of liquid iron. Coke has a lower ash concentration than coal, eliminating the need to use calcium to bind the slag and thus cutting the total amount of waste generated. Calcined petroleum coke is used in aluminum smelting to provide a carbon source for the electrolytic cell, and it can be graded to very precise purity levels such as sulfur
In addition to its specialized industrial uses, petroleum coke has a variety of environmental benefits. It is low in sulphur and nitrogen, reducing emissions from ironmaking operations. Its brittle nature makes it an excellent absorbent for toxic and hazardous chemical spills and other environmental pollutants. It can also be reused to heat ironmaking reverberatory furnaces, further lowering emissions and operational costs. In addition, it can be integrated into a polygeneration operation that can maximize utilization of off-gases from the steelmaking process for district heat and electricity generation. These off-gases are typically recycled through a natural gas pipeline system and can also be used to generate renewable energy through cogeneration technologies. As a result, the steelmaking industry can significantly reduce its environmental footprint while sustaining profitability.
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