Coal powder is a crucial material in the cast iron industry. With the continuous development of science and technology, various new materials have emerged. In the foundry industry, cast iron is a relatively large casting alloy. During the production of various cast iron parts, green sand casting is a widely used casting process. The key to green sand casting lies in coal powder.

Adding a small amount of coal powder to the clay sand used in iron casting can effectively enhance the quality of castings, including brightening the surface, defining contours, reducing sand particle adhesion, and inhibiting the movement of walls during the graphitization process. This reduces casting shrinkage defects and offers many other benefits. However, these advantages are contingent upon selecting the correct type of coal powder; if chosen improperly (such as the fineness of the coal powder, moisture content, and other parameters), it can even have significant negative impacts, even when trying to avoid them.