Specifications for Ceramic Foundry Sand
Regarding foundry sand, people all wish to choose those with high refractoriness, small thermal expansion, and perfect round shape. Artificial sand,
rather than natural sand, could better meet these requirements.
Main Chemical Composition
Sphere, Angle Factor ≤ 1.1
Thermal Expansion Rate
0.13% (10 minutes under 1000℃)
Mineral Phase: Mullite Phase≥85%, Corundum phase + Glass phase ≤15%
Bulk Specific Weight
Production Process of Ceramic Sand
Regarding product quality as the life of the enterprise, paying close attention to product quality, we do the best we can for the customers. All meshes of products produced by the company can fully meet the needs and requirements of customers for products.
≥1825℃, same level with magnesite and chromite sand, and higher than silica sand, with less sand burning.
Low breakage rate
Moh's hardness of ceramic foundry sand being 7.8, and the spherical shape, make it hard to break ceramic sand
Good spherical shape
The shape of ceramic foundry sand is spherical and the angle factor is less than or equal to 1.1. With smooth surface and perfect shape, Ceramic foundry sand has smallest superficial area, making the volume added to adhesive and curing agent much less (average 40% - 50% less). So application of Ceramic foundry sand could lower the production cost, reduce exhaust emission, and improve casting environment. The spherical shape is also beneficial to the gas emission of pouring process and also reduce the porosity in castings. With the reduction of adhesive could also help to lower the strength of the casting model and the recycle of the sand.
Low expansion rate
Better than magnesite, chromite sand and silica sand, could meet higher accuracy requirement.
pH: 7.6 – 7.8
As a neutral material, Ceramic Sand is suitable for different kinds of alkalinity or acidity adhesive. For example: water glass, clay, resin curing agent.
As a kind of special artificial sand, the bulk specific weight of ceramic foundry sand is smaller than magnesite and chromite sand. The reduction of the casting model and increased ratio of the iron sand will help to lower the production cost.
Compared to the radioactivity of zircon sand and the pollution of chromite sand (some countries have forbidden the use of chromite sand), ceramic foundry sand is a more environmental friendly material, with higher re-use ratio and lower discharge.
Application in production of steel castings
The scab phenomenon is quite common and serious in large scale steel castings, which affects the surface quality of the castings and bring lots of trouble in cleaning.
Recycle and Re-use of Ceramic Foundry Sand
The recycled use of ceramic foundry sand is as follows
Recycle of used sand.
Magnetic Separation and Roasting for Used Sand
Screening and Matching for Used Sand