Application Of Refractories In Glass Industry

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Refractories performance affects glass manufacture in the production cost and
the quality of the glass. Refractories in different areas of a glass furnace
suffer different operating environment. So different types of refractory are
used in the different parts of the glass furnaces.

Crown Refractories

Crown of glass furnaces are subjected to long-term thermal attack and chemical
corrosion due to alkali vapor. It also need to be heavily insulated to reduce
the energy loss. So it requires volume stability, low permeability, low
conductivity, and high refractoriness of refractories in this area.



Superstructure Refractories

The superstructure of the furnace will suffer from high temperature and chemical
attacks by volatile products and dust which settle on the walls and attack
refractory products characterized by a progressive wear of refractory in contact
with the glass. Refractories in this part are required to have a high thermal
shock resistance and corrosion and erosion resistance.Fused cast AZS block,
Zirconia-Mullite brick and Mullite brick with high density, low porosity, good
hot strength and good sag resistance are used in this area.

Bottom and Lower Side wall Refractories

In contact with melt glass, refractories in those areas suffer high Temperature,
and glass corrosion. Chemical reactions also take place between refractories and
molten glass, fluxing agents, and/or volatile components. Erosion can follow;
washing away refractory grains after the original bond has dissolved. With a
high refractoriness, high thermal resistance, a low reaction with melt glass, a
very strong glass corrosion and vapour resistance, Zirconia-Mullite bricks and
Fused Cast AZS are installed on the bottom or in direct contact with sidewalls.

Regenerator Refractories

These areas of the furnaces are subject to special intense aggression in the
long campaigns because of the chemical reactions between refractory material and
hot gas. A higher performance of the refractory and insulating material is
required in these cases in order to attain better heat efficiency. A regenerator
consists of a regenerator chamber in which a checker work (or just checkers) of
refractory bricks has been stacked. Due to high stability, high thermal shock
resistance, low thermal expansion, high refractoriness and the high resistance
to basic slags, Magnesia bricks are normally used in the regenerator including
area above checker work and crown. With a high alkali resistance and creep
resistance, fireclay bricks are particularly suitable for the lower parts of
regenerator.

Besides refractories mentioned above, insulating refractories with low
conductivity and good mechanical strength are used to reduce heat loss in areas
where abrasion and wear by aggressive slag and molten metal are not severe. The
insulating materials can lead to savings in fuel cost and a more rapid heat-up.
After the furnaces are installed, unshaped refractories such as special ramming
&patching masses are used to repair some parts of the furnaces to extend the
furnace?s life until the end of the campaign.

Sunrise is a refractory material supplier from China. The main products of
Sunrise include fused cast AZS block, fused cast alumina block, mullite brick,
zircon brick, alumina bubble brick, sillimanite brick, corundum brick, low
porosity fireclay brick, high alumina brick, all kinds of glass furnace ramming
masses, etc..

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