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The
raw mix composite is wet milled to micro fine particle size
around 2.5 microns and the milled composite slurry is spray
dried to form homogeneous free flowing spherical granules.
Such granules are pressed in tungsten carbide moulding tools
in automatic uni-axial compacting presses under high compaction
pressure around 2 tons/cm2 to a green density about 2.40 gm/cc.
The pressed bricks are sintered at high temperature around
1650° C in micro processor controlled gas fired tunnel/shuttle
kilns in natural oxidising atmosphere, to form an impervious
tough material. The fired density of Duralox lining
bricks is 3.7 gm/cc.
Micro fine body particle size, high compaction pressure, high
sintering temperature and typical manufacturing process makes
Duralox ceramic structure extremely compact, tough and of
higher hardness to withstand high impact erosion and high
abrasion in most critical mill operating conditions.
Duralox lining bricks are free from voids, air pockets
and hair line cracks as generally observed in ceramic lining
bricks which are produced by wet pressing or extrusion process.
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Battery
of Spray Driers
Battery
of high temperature gas-fired shuttle kilns
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Manufacturing Process