Coal Dust For Foundry

Product Description

Coal dust is a finely powdered form of coal that is commonly used in foundry applications as a carbonaceous additive. It serves several purposes in foundry operations and is typically added to molding sand or core sand mixtures to achieve specific properties and improve casting quality. Here's a description of coal dust for foundry use:

Composition:

• Carbon Content: Coal dust primarily consists of carbonaceous material derived from coal. The exact carbon content may vary depending on the type and quality of coal used.
• Particle Size: Coal dust is finely ground to achieve a desired particle size distribution suitable for mixing with molding sand or core sand. The particle size may vary depending on the specific foundry application and requirements.

Functions and Applications:

1. Carbonaceous Additive: Coal dust serves as a carbonaceous additive in foundry sand mixtures to improve mold and core properties. The carbon content of coal dust helps enhance the refractoriness and heat resistance of the sand, thereby improving casting quality.
2. Reducing Agent: In foundry processes involving metals susceptible to oxidation, such as cast iron, coal dust can act as a reducing agent. It reacts with oxygen present in the molten metal, helping to minimize oxidation and prevent defects such as surface porosity.
3. Binder Enhancement: Coal dust can be used in conjunction with binders such as clay or resin to enhance their properties. It improves the green strength and permeability of sand molds and cores, facilitating mold filling and metal solidification during casting.
4. Surface Finish: The inclusion of coal dust in molding sand mixtures can help achieve desired surface finishes on castings. It can impart a smooth texture to the mold cavity surface, reducing surface roughness and improving the appearance of the final casting.
5. Dimensional Stability: Coal dust contributes to the dimensional stability of molds and cores by reducing the risk of sand expansion or contraction during metal pouring and solidification. This helps maintain accurate casting dimensions and tolerances.
6. Cost-Effective Additive: Coal dust is a cost-effective additive compared to other carbonaceous materials used in foundry applications. Its availability and relatively low cost make it a preferred choice for foundries seeking economical solutions for improving casting quality.

Advantages:

• Improved Refractoriness: The carbon content of coal dust enhances the refractoriness and thermal stability of foundry sand mixtures, enabling them to withstand high temperatures during metal casting.
• Enhanced Metal Flow: Coal dust improves the flowability and permeability of molding sand, allowing for smoother metal flow into the mold cavity and reducing the risk of defects such as incomplete filling.
• Reduced Defects: By acting as a reducing agent and improving mold properties, coal dust helps reduce casting defects such as gas porosity, shrinkage, and surface roughness.
• Versatility: Coal dust can be used in various foundry processes and applications, offering versatility and flexibility in mold and core production.
• Cost-Effective: Coal dust provides a cost-effective solution for improving mold and core properties, contributing to overall foundry efficiency and profitability.