1.The corundum brick Production Process
Crushing→Mixing→Shaping→Drying→Firing→Inspection→Packaging and
Shipment
Properties of corundum bricks
Corundum bricks are widely used in blast furnaces and hot air
stoves in metallurgical industry, second-stage furnaces, gasifier,
gasifier, cracking furnace, ceramic, building materials, military
industry, scientific research and other industries.The corundum
bricks on various kilns are subject to high temperature, high
pressure, slag and strong reducing gas erosion and damage in
addition to being restricted by various technological
conditions.This kind of chemical erosion and structural damage to
corundum bricks reduces the service life of corundum bricks.
Chemical reaction of the high temperature of alumina, alumina
melting point is 2050 ℃, alumina and other oxide reaction at high
temperature after the formation of the melting curve, there is a
downturn in the melting temperature only chrome oxide and alumina
can form a continuous solid solution, the solid melting zone
between the two kinds of oxide melting point.
The main impurities in corundum bricks are silicon dioxide and iron
oxide.In Al2O3 - SiO2 - FeO ternary system phase diagram, the
lowest melting point is 1205 ℃, which formed in more than 1200 t
can glass phase. Titanium oxide and niobium oxide can reduce the
melting point of alumina products and also be the sintering AIDS.In
the sintering process, alumina is mixed with titanium oxide and
niobium oxide to form aluminum titanate or aluminum niobate. 1% of
titanium oxide or niobium oxide is added into alumina.
Vanadium pentoxide is a low melting oxide.At low temperature, the
boundary dissolution of aluminated aluminum crystals occurs and the
grains are dissected.And vanadium pentoxide and CaO under oxidizing
atmosphere, generate calcium vanadate of low melting point (618 ℃),
under the weak reducing atmosphere generated volatile calcium
vanadate. The destructive effect of vanadium pentoxide on corundum
brick is to produce vanadium pentoxide precipitate between corundum
grain in corundum brick, which causes cracking, and then produces
structural crack and large scale flaking.
With sodium sulfide erosion of corundum brick is in the process of
gas coagulation of sodium oxide in 1000 ℃ can erode corundum
brick.The post-al2o3 in corundum was transformed into p-al2o3,
which caused the volume of the brick to expand greatly (about 26%)
and caused the corundum brick to crack and peel off the epidermis.
Na2O and SO3 under 1000 ℃ can react with sillimanite and mullite,
to generate the gray stones and beta Al2O3, volume increases by
about 86%, peeling, split brick.
2.The corundum brick Quality Assurance
HongTai Refractory is committed to high quality standards for all
its products and services. With its thirst on State of the art
technology at every level and a wide range of products, HongTai
Refractory can provide ideal solutions for the stringent
requirement of the customer. Backed by decade of experience in
different industries, and close association with customers,HongTai
Refractory will always bring new products which will give better
life and value to the user.
The quality assurance system consists of the following steps:
1. Inspection and Control of incoming raw materials:According to
the chemical content,raw materials are classified into different
levels to ensure quality of brick first.
2. Inspection and process control:During the production, each brick
weight twice to reduce weight error.
3. Inspection of product Standardization of quality of each product
by process control and experimentation.
4. Taking corrective measures whenever deviations are noted.
