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Brief analysis of the composition of different types of silicon-aluminum refractory bricks

Date:2019-10-15 10:35 | From:Zhengzhou Sunrise Refractory | Author:admin
According to the different composition of refractory bricks, they can be divided into five categories, namely: silicon-aluminum refractory bricks, alkaline series refractory bricks, carbon-containing refractory bricks, zirconium-containing refractory bricks, and heat-insulating refractory bricks. Any furnace is not built with only one type of refractory brick, and a different refractory brick is required for use. The composition of these five categories of refractory bricks will be described in detail below.
(1)Silica brick refers to refractory brick containing SiO293% or more, which is the main type of acid refractory brick. It is mainly used for masonry coke ovens, but also for the vaults and other load-bearing parts of various glazing furnaces of glass, ceramics, carbon calciner and refractory bricks. It is also used in the high-temperature load-bearing parts of hot blast stoves, but it is not suitable. Used in thermal equipment below 600 °C with large temperature fluctuations.
(2)Clay bricks and clay bricks are mainly composed of mullite (25% to 50%), glass phase (25% to 60%), and cristobalite and quartz (up to 30%). Usually, the hard clay is used as a raw material, and the mature material is pre-calcined, and then soft clay is used to form a clay brick product by a semi-dry method or a plastic molding method at a temperature of 1300 to 1400 C. It is also possible to add a small amount of a binder such as water glass or cement to make a non-fired product and an amorphous material. It is a commonly used refractory brick in blast furnaces, hot blast stoves, heating furnaces, power boilers, lime kiln, rotary kiln, ceramic and refractory brick firing kiln.
(3)High-alumina refractory bricks, the mineral composition of high-aluminum refractory bricks is corundum, mullite and glass phase, the content of which depends on the ratio of AL2O3/SiO2 and the type and quantity of impurities, and the grade of refractory bricks can be classified according to the content of AL2O3. The raw materials are high alumina bauxite and sillimanite natural ore, as well as fused corundum, sintered alumina, synthetic mullite, and clinker calcined in different proportions with alumina and clay. It is mostly produced by sintering. But the products also have cast bricks, fused bricks, unfired bricks and unshaped refractory bricks. High alumina refractory bricks are widely used in the steel industry, non-ferrous metals industry and other industries.
(4) Corundum refractory bricks, corundum bricks refer to refractory bricks with an AL2O3 content of not less than 90% and corundum as the main phase, which can be divided into sintered corundum bricks and fused corundum bricks.

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