Rotary foundry sand dryer-efficient drying for sand

ZHENGZHOU, China - Nov. 25, 2025 - PRLog -- What is foundry sand?

Foundry sand is mainly used in the foundry industry, it is made by mixing various materials such as base sand, clay, coal powder, water, and silica sand in a specific ratio. To ensure the sand molds and cores have sufficient strength and do not deform or break during transportation, molding, and pouring of molten metal, a sand binder is typically added during the casting process to bind the loose sand grains together.

Why does foundry sand need to be dried?

If the moisture in foundry sand is too high, it will cause problems such as porosity and sand flushing, and reduce the permeability and strength of the molding sand. Therefore, it must be dried.

The moisture content requirement for foundry sand is generally between 0.5% and 1.5%. If it the moisture contect is too high, it will reduce the strength of the mold and the quality of the casting, so drying is necessary.

Advantages of using rotary dryer for foundry sand

At present, rotary dryer is the most common equipment used for drying foundry sand, and it has the following advantages:

1. Foundry sand itself has certain wear and corrosion properties. The lining and lifting plate of the rotary dryer can be made of high wear resistant steel, which has a wear resistance 3-4 times higher than ordinary carbon steel, and the equipment service life more than 10 years.

2. Foundry sand has strict requirements for moisture content. Rotary dryers can sense the moisture content of the sand and intelligently adjust the drying temperature and airflow to stably reduce the moisture content of the foundry sand to 0.5-1%, meeting the moisture requirements of the foundry industry.

3. The rotary foundry sand dryer adopts a multi-stage structure and optimized layout of lifting plates, with a thermal efficiency of up to 80% and low total power, saving 40% energy.

4. Fuels available include coal, diesel, natural gas, and biomass. Rotary foundry sand dryer can stably dry foundry sand, quartz sand, resin sand, and powdered recycled sand below 40mm, with wider adaptability.

5. Adopting three-drum structure, the footprint of the dryer is reduced by 40% compared to a single drum dryer, and the civil engineering investment is reduced by 50%.

Product website: https://www.zzjtmachinery.com/product/dryer/49.html