REFRACTORY CHROMITE SAND

Brief Introduction of Refractory Chromite Sand

Refractory chromite sand is a naturally occurring spinel consisting primarily of chrome and iron oxides, processed by crushing and sieving. The main chemical composition of chromite sand is Cr2O3, which heat volume stability, high heat conductivity. When chromite sand contact with the molten metal doesn’t react with iron oxide and other chemical reactions, chromite sand has solid-phase sintering characteristics. It can well prevent infiltration of molten metal.

Physical and Chemical Index of Refractory Chromite Sand

Cr2O3 % : Min 44
Fe2O3(Feo)% : Max 28
SiO2 % : Max 3
CaO % : Max 0.5
Al2O3, MgO: Re t
Bulk Density: 2.5-3 gr/
Color: Black
PH: 7-9
The amount of the acid: Max 2 ML
Percent soil: Max 0.1
Percent Moisture: Max 0.1
The sintered: 1600 °c
Percentage of free acid present in the sand : 0%
Grading: AFS 45-55

Characteristics of Refractory Chromite Sand

• Anti-melting
• Reduces wear and tear
• Improve the high-temperature friction coefficient
• Improve the heat recession
• High-temperature strength
• Good thermal conductivity
• Impact resistance
• Corrosion and erosion resistance
• Good thermal shock resistance

Application of Refractory Chromite Sand:
Chromite sand is mainly used for large-scale steel casting surface sand to prevent casting surface sticky sand; it can also be used to cast a coating refractory aggregate; It applies to casting coating and ceramics and glass, metallurgical melting, and other fields.

1. Chromite sand (rich one/concentrate ) is used for casting ferrochrome.
2. In the refractory material industry, chromite sand is used for making magnesite-chrome brick, chrome brick, chrome alumina brick, etc.
3. In the chemical industry, chromite sand is often used for making dichromate.
4. Cast stone grade chromite sand requirement: producing diabase cast stone, Cr2O3:10%-20%, SiO2.