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The difference between high strength alkali resistant brick and fire clay brick

February 1, 2024


The firing temperature of the brick process between the high strength alkali brick and fire clay brick is the same, but the the raw material process is not the same, the sintering temperature of the sintering time is not the same. High-strength alkali-resistant brick has strong alkali resistance, while clay brick is a slightly acidic product with strong resistance to acid erosion. Two kinds of refractory bricks are completely used in different atmospheres, alkali-resistant bricks are mostly used in cement rotary kilns, and fire clay brick have a wide range of use.


High-strength alkali-resistant brick need to add a certain proportion of high-voltage electric porcelain, silica, bauxite particles and powder after stirring, mechanical pressing, and then sintered at a certain temperature. The alkali resistance and strength of alkali-resistant brick can be improved by adding proper proportion of electric porcelain. With the addition of 20% of high-voltage electric porcelain and 10% of waste silica brick powder or silica powder, the high-strength alkali-resistant brick will have high strength, low porosity, thermal shock resistance, alkali resistance and fatigue resistance, which can better meet the needs of use.


The fire clay brick is made by bauxite particle grading, clay powder preparation, forming by the high pressure molding machine and then through high temperature sintering, The fire clay brick are mainly made of mullite, cristobalite and glass phase, their content determines the properties of fire clay brick. The composition and impurity content of clays is vary greatly from different producing areas. The phase composition of fire clay brick has a wide range of changes, and the current production of fire clay brick on the market has a part of recycling bricks, and the fluctuation range is relatively stable.


The high-strength alkali-resistant bricks are used in cement rotary preheater, calciner and tertiary air pipe, etc. These parts require high-strength alkali-resistant bricks with high strength, low porosity, good thermal shock resistance and excellent alkali resistance. The fire clay brick are suitable for a variety of industrial furnace linings, which are wider use than alkali-resistant bricks, and the using quantity proportion is also large.