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Sintered Spinels

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Sintered spinels are alumina and magnesia composites in different ratios. The high quality of the products is ensured by using alumina from own production, magnesia from verified sources and with detailed control of the production process.
During sintering, alpha-alumina crystals are combined with magnesia crystals to shape greater crystals, which give spinels a unified crystal structure, low porosity and high density. The use of spinels in magnesite and alumina refractory products increases their thermal shock and corrosion resistance. Silkem offers a broad range of sintered spinels, which are produced with crushing, grinding, mechanic and magnetic separation and the mixing of fractions.
  • Spinels, which differ in terms of content of individual components, are predominantly intended for the manufacturing of refractory materials that are used in the cement and steel industries.

Chemical Composition (%)Spinel SP67Spinel SP78Spinel SP90
 (Typical)(Typical)(Typical)
Al2O3 67.0 78.0 90.0
MgO 32.0 21.4 9.4
Na2O 0.17 0.12 0.12
SiO2 0.13 0.10 0.10
Fe2O3  (Total) 0.25 0.15 0.15
CaO

0.45

0.20 0.20

 

Physical Characteristics1MinMax
Bulk Specific Gravity (g/cm3) 3.2  
Apparent Porosity (%) 1.2 2.6
Water Absorption (%) / 1.0

1 For all three types of spinels

Standard grain size2

(mm)(mesh)(mm)(mesh)
3–6         3–6 0–0.5/0.6 –28
1–3         6–14 0–0.090 –170
0–1 –14 0–0.045 –325
0,5/0,6–1       14–28 0–0.020 –635

  2 Other grain sizes are also possible

sintrani-spineli
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