Foundry Coke
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Foundry coke is a type of coke mainly used for melting iron in cupola furnaces, also known as cupola coke. The following is a detailed product description:
Definition and Usage
Definition: Foundry coke is a porous solid fuel mainly composed of carbon, obtained by the high - temperature dry distillation of coal.
Usage: In the iron - casting process, its main function is to melt the charge and superheat the molten iron. At the same time, it supports the charge column to maintain good air permeability, ensuring the smooth progress of the smelting process. It is widely used in foundries for casting parts of machinery, automotive components, and sculptures.
Physical and Chemical Characteristics
Physical Characteristics
Large and Uniform Lump Size: Usually, the lump size of foundry coke is required to be 30 - 300 mm, such as 30 - 80 mm, 60 - 90 mm, etc. A large and uniform lump size is beneficial for ensuring good air permeability and wind - penetration ability in the furnace.
High Impact Crushing Strength: It has high strength and can resist the impact of the charge during the loading process and the friction and static pressure in the furnace, maintaining the stability of the coke lump size in the furnace and the stability of the bottom coke.
Chemical Characteristics
High Fixed Carbon Content: The fixed carbon content of high - quality foundry coke can reach more than 88% or even higher. The higher the fixed carbon content, the higher the calorific value, which is conducive to increasing the furnace temperature and reducing heat loss.
Low Ash Content: The ash content is usually required to be less than 12%, and for super - grade foundry coke, it is less than 8%. Low ash content helps to improve the temperature of the molten iron and reduce the impurity content in the iron water.
Low Sulfur Content: The sulfur content is generally required to be less than 0.6%, and for high - quality foundry coke, it is less than 0.5%. Sulfur is a harmful element that can affect the quality of castings, so low sulfur content is very important.
Low Volatile Matter Content: The volatile matter content is usually required to be less than 1.5%. Appropriate and stable volatile matter content can ensure the strength and fixed carbon content of foundry coke during use.
Production Process
The ideal raw material for foundry coke is coking coal with low ash, low sulfur, medium volatile matter, and medium - strong caking property. If this kind of coking coal is insufficient, it can be achieved by mixing different types of coal. In the production process, a wide - carbonization - chamber coke oven is usually used, and the coking time is extended by adjusting the furnace temperature to obtain larger - sized and more stable coke.
