Spinel

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Raw material
Fused magnesia spinel is made from high purity caustic calcined magnesia powder and alumina powder.

Processing
Smelted by a large high-temperature electric arc furnace, classify into different grain sizes.
Spinel manufacture

Applications
1)Our fused spinel series including magnesia-rich spinel, common spinel and alumina-rich spinel, used for corundum spinel castable in steel ladle, porous plug, nozzle, furnace lid and other parts
2)The top of steel-making electric furnace, converter , ladle, large cement rotary kiln firing zone, transition area and glass regenerator which requires slag resistance, wear resistance and high refractoriness.
3)The alumina-rich spinel, with good alkaline resistance and good penetration resistance, is mainly used for high-performance alumina spinel castable, and the demanding parts that RH spinel brick instead of magnesia-chrome brick.

Model	Al₂O₃	MgO	CaO	SiO₂	Fe₂O₃	Na₂O	Bulk density （g/cm3）

AM-65	64~66	33~35	≤0.8	≤0.5	≤0.6	≤0.4	≥3.3
AM-70	74~76	23~25	≤0.65	≤0.4	≤0.4	≤0.35	≥3.2
AM-90	87~90	9~12	≤0.4	≤0.25	≤0.4	≤0.30	≥3.3
Particle size	0~1~3~5~8mm, 0-180 mesh, 0-200 mesh, 0-325 mesh, 2μm, 5μm
Test standard	GB5069-2001
Melting point	2135℃
Chemical formula	MgAl2O4
Package	25Kg/Bag, 1Ton/Bag or as customers’ requirements

Advantages
Al₂O₃ and MgO is connected by ionic bond, constructure fastness
High melting point（2135℃）
High strength
Low thermal expansion rate
Good corrosion resistance and alkali slag resistance
High heat resistance-High mechanical stress
High resistance to change
The content of secondary oxide phase is low, which makes it have high refractoriness
High purity of material, it can be used to produce impurity - free refractories.