3. Classification of refractories according to their main components
The so-called main components are the first phase and the second phase components, the content of about 90% of the total chemical composition.
Modern refractory technology development more and more material ingredients, so the emergence of the second phase, the third phase composition, adjust the second phase, the third phase composition can produce a new technology, in the chemical composition beyond the first phase of the classification limitations, is the most common application of a classification method.
(1) silicon-aluminum series products: to silicon-aluminum series of materials, the main component is SiO2, Al2O3, it includes clay bricks, high alumina bricks, silica nepheline, bluestone, rhodochrosite, mullite bricks and other products.
(2) magnesium-chromium series products: magnesium-chromium series in the main components are MgO, Cr2O3, magnesite for the first phase, magnesium-chromium spinel for the second phase, belonging to this series of products are magnesium-chromium bricks and chromium-magnesium bricks.
(3) magnesium aluminum series products: the main components are MgO, Al2O3, as they generate MgO.Al2O3, magnesium-chromium series products contain magnesium materials.
(4) magnesium calcium series products: the main component is to MgO, CaO. they have very high melting point, is an important magnesium material.
(5) magnesium-silicon series products: magnesium sand system's main component is SiO2, when C/S<5, SiO2 and MgO to generate MgO.Al2O3 (magnesium olivine), from the perspective of the micro-mineral composition, the main products of the pure aluminum series of magnesium-aluminum bricks, square magnesia spinel bricks, corundum spinel bricks, the aluminum in the indeterminate material - spinel castables also belong to magnesium-aluminum series products.
