Coke is used as a fuel and a reducing agent in the molten iron ore. It is produced by roasting coal until it becomes carbon by burning impurities without burning the coal itself. When coke is consumed, it produces high temperatures but little smoke, making it an ideal choice for smelting iron and steel. Before the 1880s, steel was produced from charcoal. By 1920, nearly 90% of US steel was produced using coke.

Coke processing

Cola is made by by-product or non-recycling methods.

Coke processing and Coal quality

In by-product coke, impurities are baked between 1800-3600 degrees Fahrenheit to leave almost pure carbon. The oven used must not contain oxygen to avoid reacting with other elements that may leave impurities. When coal is “coking”, it softens into a liquid, but solidifies into a porous material upon cooling. The gases produced in the coke process are piped to the by-product plant where they can be collected for other uses.stainless steel sheet suppliers

In non-recycling (or heat recovery), the ovens are stacked in a honeycomb and heated from the top while air is combusted through the bottom. Hot exhaust gases are sent to the boiler to generate steam (heat recovery) or not used at all (not recycled).

Coal quality

In coke or non-coke, the quality of the coal affects the quality of the steel. Metallurgical coke is made from bituminous coal by a distillation process. The ash deposited from the coal must be kept to a minimum, preferably less than 10% of the original mass. Ash can reduce furnace temperature and leave incombustible materials. Coal is also selected to obtain a higher amount of volatile sulfur or alkali content to help it burn more completely. However, in practice, the coal used usually depends on availability and price.

Blast furnace injection

In the 1960s, when steel was melted in a blast furnace, pulverized coal was injected. This provides extra energy to burn the gas and prevent iron oxide (rust) and reduce coke consumption. By the 1990s, coal use became the norm.

Typically, the preparation of coal involves drying and grinding the coal into fine particles of less than 1 mm for injection. The coal particles are separated from the released gas in a cyclone. Exhaust gas, sometimes natural gas, can be used to dry additional coal, which typically maintains a moisture content of less than 6%. Inert gases are used to minimize the risk of coal particles igniting or igniting.

Although the pressure on the coal industry has been high for many years, coal is vital to steel production, and our civilization is heavily dependent on steel. Without it we would not have our vehicles, high-rise buildings, electrical appliances or many tools and utensils that we take for granted every day.

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