Silica ramming mass is made
of SiO2. SiO2 is known as Silicon dioxide. Silica ramming mass is acidic in
nature. It is used in powder form for lining or ramming in induction furnace.
Quartzite stone is used to produce the Silica. Purity of quartzite stone is
very high. Quartize is broken in small pieces or crushed. If there will be
impurities in the stone, then it will create problem in later stage. Impurities
will produce more amount of the liquid at heavy temperature. It will lower down
the chemical and mechanical resistance of the lining. High purity silica gives
longer life to the lining in furnace. Material produces from high quality silica
lining furnace is uniform in quality and physical properties.
Silica lining are compact in comparison
to other linings. Compactness of the lining depends on the proportion of the size
of the granules in powder. Preportion of the size of granules is known and granulometrics.
Granulometric composition should be in
such way that there should be minimum vacant or open space among the particles.
An ideal granulometric
composition of commercial acidic silica ramming mass is given below.
SIZE PERCENTAGE
4mm to 1mm 33%
1mm to 0.20mm 30%
0.20mm to0.06mm 17%
0.06mm & below 20%
Proportion of the finest
material is very important. As it takes in part in the sintering reaction. If the
fine particles are more then it may lead to adverse effect of on performance of
ramming layer.
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