Fireclay bricksis suitable for supporting hot blast stoves of large, medium and small blast furnaces
Physical and chemical indicators of low creep rate clay bricks
Fire clay bricks use super-grade coke gemstone, mullite and andalusite as the main raw materials, and use grade 3 ingredients and mixed fine grinding to produce high-quality hot blast stove bricks. It has been similar to Japanese products and has reached the product indicators of similar foreign products.
Clay bricks are suitable for supporting hot blast stoves of large, medium and small blast furnaces, and are mainly used in heat storage middle and lower walls, lower lattice bricks, supporting strings and other parts.
term |
Specified value |
||||
DRN-125 |
DRN-120 |
DRN-115 |
DRN-110 |
||
Al2O3%≥ |
45 |
42 |
40 |
36 |
|
Bulk density/(g/cm3) |
2.15~2.35 |
2.00~2.20 |
2.00~2.20 |
2.00~2.20 |
|
Compressive creep rate(0.2Mpa ×50h) |
1250℃ 0.8 |
1200℃ 0.8 |
1150℃ 0.8 |
1100℃ 0.8 |
|
Heating permanent line rate of change/% |
(1400℃×2h) |
-0.3~+0.1 |
- |
- |
- |
(1350℃×2h) |
- |
-0.3~0.1 |
- |
- |
|
(1300℃×2h) |
|
|
-0.4~0.1 |
-0.4~0.1 |
|
Apparent porosity/%≤ |
22(24) |
22(24) |
22(24) |
22(24) |
|
Normal temperature compressive strength/MPa≥ |
40 |
35 |
30 |
25 |
|
1:The data in parentheses are the indicators of the regenerator checkered bricks 2: The volume density index is the reference index of the design brick quantity, not for reference
|
Fireclay bricks are classified as weak acid refractories. Due to the large fluctuation range of chemical composition, different production methods, and differences in firing temperature, the properties of clay bricks change greatly.We can produce all kinds of Fireclay bricks according to customers' requirements
low porosity clay bricks are mainly used in the regenerators of glass kilns. They can also be used in blast furnaces and hot blast furnaces in the steel industry; cement kilns in the building materials industry; chemical kilns in the chemical industry as kiln linings
The Al2O3 content of clay heat Clay insulating refractory bricks is generally more than 40%, and the Fe2O3 content is less than 2.0-2.5%. The clinker in the ingredients is 65-85%, and the combined clay is 35-15%. The crushed bonded clay and the finely ground clinker are mixed and milled, and then mixed with the granular clinker to make semi-dry mud, high pressure molding, and sintering at about 1400 ℃, with good performance.
The refractoriness of clay bricks is comparable to that of silica bricks, up to 1690~1730℃, but the softening temperature under load is more than 200℃ lower than that of silica bricks. Because in addition to the high refractory mullite crystal, the clay brick also contains nearly half of the low melting point amorphous glass phase.
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