Ceramic Foundry Sand

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Ceramic Foundry Sand

Ceramic foundry sand is made from high-quality calcined bauxite, processed through electric fusion, granulation, and screening processes to produce spherical refractory particles.

Applications

Mainly used in casting processes such as shell molding, precision casting, lost foam casting, heavy steel casting, resin coated sand casting, vacuum casting, and investment casting.
Steel ladle drainage agent (replacing chromite foundry sand) - high pouring rate, low specific gravity, low thermal expansion rate.
Alloy surface treatment (replacing glass beads) - Moderate hardness, good wear resistance, stable chemical composition.
Refractory coatings (replacing zirconium powder or alumina powder) - High refractoriness, low thermal expansion coefficient, good permeability, low cost.

Features

Spherical grain shape with excellent flow ability and easy compaction. Smooth surface, dense structure, low surface area, requiring less binder and curing agent. It has high compactness, preventing metal liquid infiltration and mechanical sand penetration.
High refractoriness and good chemical stability at high temperatures. It is a neutral material, resistant to corrosion by metal compounds, preventing chemical sand sticking.
Low thermal expansion rate effectively prevents the gradual formation of expansion defects.
Good resistance to breakage, minimal dust generation, environmentally friendly, and recyclable, reducing costs and conserving resources.

Typical Chemical Analysis

Chemical Composition	Al2O3	SiO2	Fe2O3	TiO2	CaO	MgO	K2O	Na2O
Content	70-75%	8-20%	≤ 3%	≤ 3.5%	≤ 0.45%	≤ 0.35%	≤ 0.33%	≤ 0.08%

Typical Physical Properties

Shape	Spherical	Refractoriness	≥ 1800℃
Color	Dark Brown	Thermal Expansion	0.13%
Bulk Density	1.95 -2.05g /cm	Thermal Conductivity	0.698W/M.K
True Density	3.4g /cm	Angularity	≤1.1

Particle Size Distribution

Mesh	μm	1700	850	600	425	300	212	150	106	75	53
Mesh	spec	10	20	30	40	50	70	100	140	200	270
20-40		≤2	15-40	30-55	15-35	≤3
30-50			≤10	25-45	35-55	5-15	≤5	≤2
40-70				≤10	25-45	20-40	5-25	≤7	≤5
40-100				≤3	10-25	25-40	25-45	10-25	≤10	≤5
50-100					≤10	10-30	30-50	15-35	≤15	≤5	≤2
50-140					≤8	10-25	20-45	20-45	5-20	≤7	≤2
70-140						≤10	10-25	25-45	15-35	≤15	≤5
100-200							≤3	10-35	35-55	15-35	≤10
100-270							≤2	5-20	30-50	25-45	5-20
140-270								≤5	5-25	40-60	25-40
200-270								≤5	35-55	25-45	25

(other sizes are customizable)

Production Flow

Ceramic Foundry Sand Processing
Bauxite smelting
Electric fusion sand making

Screening
Sampling
Testing
Packaging

FAQs

The refractoriness of ceramic foundry sand refers to its ability to maintain its physical and chemical properties under high temperatures. As a refractory material, ceramic foundry sand needs to withstand various thermal stresses, chemical erosion, and mechanical stresses under high temperature conditions to ensure its service life and stability.

a. Refractoriness test method:
The refractoriness test is conducted by placing the ceramic foundry sand sample under high temperature conditions and gradually heating it until significant sticking, cracking, or loss of physical and chemical properties occurs in the sample.

b. Refractoriness test standards:
Common international refractoriness test standards for ceramic foundry sand include ISO, ASTM, etc. Domestic standards include GB, JC, etc.