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Refractory Selection for the Container Glass Furnace

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Old September 15th 15, 10:44 AM posted to rec.crafts.glass
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Default Refractory Selection for the Container Glass Furnace

Container glass is a type of glass for the production of glass containers,
such as bottles, jars, drinkware, and bowls. With the increasing of the demand
for the container glass, the quality requirement for the container glass is
higher too. Refractory is one of the most important factors that affect the
quality of the container glass.

Container glass is made by melting silica sand, soda ash and limestone.
Various secondary ingredients are added to control color, provide ultra-violet
protection and enhance the working properties of the molten glass. Container
glass has a lower MgO and Na2O content than flat glass, and a higher SiO2,
CaO, and Al2O3 content. Its melting temperature is up to 1580~1600℃.

The raw materials is continuously fed to a furnace where it is melted to
molten glass. Molten glass is continuously withdrawn through a submerged
throat where it proceeds to the refiner area of the furnace and cooled. Then
the molten glass is delivered to the individual bottle-making machines via the
forehearths and fed into the molds of the bottle-making machine.

Generally, container glass furnaces employ silica brick in the crown, due to
its good mechanical properties at high temperature and good creep resistance.
Sometimes, fused cast AZS 33# is also used in the superstructure. The drawback
is the exudation of the glass phase, which will cause glass defects such as
stones and stripes. Reducing the glass phase can effectively reduce the
exudation of the glass phase. Fused cast AZS with a lower glass phase is
developed for the use of superstructure. Fused cast alumina block is also used
in the crown of the glass furnace, especially the oxygen-fuel furnace, due to
its good resistance to glass liquid corrosion and alkali vapor and low
blistering and stoning potential.

In the glass contact areas, fused cast AZS is used. The higher the content of
ZrO2, the better the corrosion resistance. Fused cast AZS 41# is widely used
in the demanding areas such as sidewalls, doghouses, throat, bottom budding,
dam blocks, and electric block corners.

Fused cast AZS , alpha-beta fused cast alumina block and sintered brick are
used in the channel of the container glass. Fused cast AZS has good corrosion
at high temperature, but the drawback is the potential of glass defects. when
the requirement of the glass is higher, alpha-beta fused cast alumina block is
used. However, under 1350℃, it is recommended to use fused cast AZS.

In the regenerator, the chamber work mainly uses sintered tubular block and
fused cast cross block. Basic sintered tubular block is used more widely due
to stable mechanical structure and low possibility of clogging. Low porosity
fireclay brick is used in the lower parts, direct-bonded magnesia brick in the
middle part, 95 magnesia brick in the upper part and 97 magnesia brick or
sintered AZS brick in the top part.

Zhengzhou Sunrise is a refractory material supplier from China, offering high
quality refractory materials for glass furnaces, including fused cast AZS
block, fused cast alumina block, fused cast high zirconia block, mullite
brick, zircon brick, alumina bubble brick, magnesia brick, sillimanite brick,
corundum brick, low porosity fireclay brick, high alumina brick, all kinds of
glass furnace ramming masses, etc..

Article Source: http://www.sunriserefr.com/



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