What are the uses for chromite sand?
Chromite sand has a wide range of uses in industrial production, especially in casting, alloy manufacturing, ceramics, glass, chemicals and refractory materials. The details are as follows:
I. Foundry industry:
1. Casting mold filling material: Chromite sand has high melting point and high temperature resistance, which can resist the corrosion and erosion of metal liquid, make the surface of castings smoother, and improve precision and quality.
2. Prevent sand sticking: As the surface sand of large steel castings, its hardness and wear resistance can effectively prevent sand sticking on the surface of castings.
3. Chilling material: The thermal conductivity is several times greater than that of silica sand, which can replace part of the cold iron, accelerate the cooling of castings, and prevent pore defects caused by uneven solidification.
4. Refractory aggregate: after grinding, it is used for the preparation of casting coatings to improve the refractory and wear resistance of coatings.
5. Drainage sand raw material: Due to its good air permeability and refractory properties, it is an ideal choice for guiding the smooth injection of molten metal into the mold.
Ⅱ. Alloy manufacturing industry: stainless steel and alloy raw materials: the chromium element in chromite sand can improve the hardness, strength and corrosion resistance of the alloy, making stainless steel have excellent high temperature resistance, corrosion resistance and wear resistance.
Ⅲ. Ceramic industry: glaze, pigment and porcelain additives: chromium ore sand can give ceramic products rich colors (such as green, blue), and improve their strength and durability.
Ⅳ. Glass industry: glass colorant: chromium ore sand can make glass appear green or blue-green, and improve the transparency, toughness and seismic resistance of glass.
Ⅴ. Refractory materials: manufacturing refractory materials: due to its high melting point and high temperature resistance, it can maintain physical and chemical properties under high temperature environment, it can maintain physical and chemical properties under high temperature environment, so it is widely used in refractory bricks, refractory castables and refractory coatings.
Chromite sand, also known as chrome ore sand, is a special sand for casting with natural chromite ore from South Africa as the main raw material, which is processed into a specified particle size through crushing, screening and other processes. Its main component content Cr2O2 is more than 46%, with high thermal conductivity, resistance to alkaline slag and solid phase sintering characteristics, which can prevent sand from sticking to castings. It is widely used in large steel castings, coating aggregates and chilling material replacement.
Available size:
Sand: AFS30-35 AFS35-40 AFS40-45 AFS45-50 AFS40-50 AFS45-55 AFS50-55 AFS55-60 AFS60-65
Powder: 200MESH, 325MESH, 400MESH, 500MESH, 600MESH, 800MESH, 1000MESH, 1200MESH, 1500MESH, 2000MESH, 2500MESH
Chemcial index for chromite sand:
| Cr2O3 | SiO2 | FeO | CaO | MgO | Al2O3 | P | S | Cr/Fe |
| ≥46.0% | ≤1.0% | ≤26.5% | ≤0.30% | ≤10.0% | ≤15.5% | ≤0.003% | ≤0.003% | 1.55:1 |
Physical index for chromite sand:
| Bulk density | Volume density | colour | PH | sintering temperature | melting point |
| 2.5-3g/cm³ | 4.0～4.8g/cm3 | black | 7-9 | > 1800°C | 2180°C |