Description of Magnesite-chrome bricks
Magnesite-chrome bricks are refractory products containing
magnesium oxide (MgO) and chromium oxide (Cr2O3) as the main
components, and periclase and spinel are the main mineral
components. This type of brick has high refractoriness, high
temperature strength, strong resistance to alkaline slag, excellent
thermal stability, and certain adaptability to acidic slag.
Instructions for use of Magnesite-chrome bricks
Magnesite-chrome bricks are mainly used in metallurgical
industries, such as the construction of open hearth furnace roofs,
electric furnace tops, furnace refining furnaces, and various
non-ferrous metal smelting furnaces. The high temperature part of
the ultra high power electric furnace wall is made of fused cast
Magnesite-chrome bricks. The high erosive area of the refining furnace outside the furnace is made of
Magnesite-chrome bricks made of synthetic material.
Features of Magnesite-chrome bricks
The refractoriness is greater than 2000 °C, the softening
temperature under load is generally above 1550 °C, the high
temperature volume stability is good, and the rapid cooling and
heating resistance is good.
Application field of Magnesite-chrome bricks
Mainly used for cement rotary kiln, glass kiln regenerator,
steelmaking furnace lining, refining ladle permanent layer,
non-ferrous metallurgical furnace, lime kiln, mixing furnace and
refractory high temperature furnace lining, etc.; also used for
open hearth furnace top, electric furnace Furnace top, refining
furnace outside the furnace and various non-ferrous metal smelting
furnaces.
Classification of Magnesite-chrome bricks
(1) Ordinary Magnesite-chrome bricks
(ie silicate combined Magnesite-chrome bricks), this kind of brick
is made of chrome ore and magnesia with more impurities (SiO2 and
CaO). The firing temperature is not high, around 1550°C.
(2) Directly bonded Magnesite-chrome bricks
are made of chromium concentrate with low impurity content and
relatively pure magnesia. The firing temperature is above 1700°C.
The structural feature of this kind of refractory brick is that the
refractory crystal grains are mostly in direct contact.
(3) Recombined Magnesite-chrome bricks
are combined with Magnesite-chrome bricks. Magnesite-chrome bricks
made from artificial synthetic raw materials co-sintered magnesia
chromium materials or fused magnesia chromium materials (or partly
fused magnesia) are called recombined Magnesite-chrome bricks.
(4) Semi-recombined Magnesite-chrome bricks
which are made of artificial synthetic raw materials as granules,
and chromium concentrate and magnesia as fine powder, should be
called semi-recombined magnesia-chrome bricks.
(5) Casting Magnesite-chrome bricks
are made of magnesia and chrome ore with a certain amount of
additives, mixed, compacted and bisque-fired, broken into pieces,
melted in the electric arc furnace, injected into the mold, and
annealed to produce master bricks
