High alumina brick is one of the indispensable basic refractory materials in the upper and middle parts of blast furnace body in iron and steel industry
Min order:
2000high alumina refractory bricks for blast furnaces
The upper and middle parts of the furnace body are the places where the blast furnace material and lumps fall. The temperature on the upper part of the furnace body is low, and the main reason for its damage is that the cloth and the charge will be brought under the belt. Mechanical scour and chemical attack by alkali metals that accumulate there with the updraft. In the middle of the furnace body, the temperature is higher and the temperature fluctuates greatly. At the same time, some materials are heated and decomposed here. Therefore, the main reason for the damage to the refractory material is the thermal shock damage caused by the temperature change in the furnace, by the material drop and furnace gas. rising machinery
scour effect. On the whole, the requirements for the refractory materials for the upper and middle parts of the blast furnace should be: the masonry lining material should have low porosity, high mechanical strength, can resist the wear of the charge and the updraft, and should also have good performance. high resistance to alkali metal attack, and requires low iron oxide content in the material to avoid redox reactions with rising CO. The refractory materials used are clay bricks and high alumina bricks, sillimanite bricks, dense clay bricks, etc.
Among them, the indicators of high alumina bricks are:
term |
GL-65 |
GL-55 |
GL-48 |
|
Al2O3≥ |
65 |
55 |
48 |
|
Fe2O3≤ |
2.0 |
|||
Refractoriness℃> |
1790 |
1790 |
1790 |
|
Apparent porosity≤ |
20(23) |
19(23) |
19(23) |
|
0.2MpaLoad softening start temperature ℃≥ |
1500 |
1480 |
1450 |
|
Linear change |
1500℃,2h |
0-0.2 |
- |
|
1450℃,2h |
- |
|
||
Normal temperature compressive strength/MPa≥ |
58.8 |
49 |
Physical and chemical characteristics of high alumina bricks:
1. Wear resistance: the higher the index, the better the wear resistance
2. Thermal conductivity: Under the condition of unit temperature gradient, the heat flow rate through the unit area of the material is related to the porosity
3. Impact resistance: good impact resistance and long service life
4. Slag resistance: the ability to resist slag erosion at high temperature without being damaged
Common low-creep high-alumina bricks can be used in blast furnace hot blast stoves, as well as other industrial kilns, and can also be made into low-creep high-alumina bricks of different sizes according to specific construction requirements, such as lattice bricks, special-shaped bricks, anchor bricks, etc. , mainly used in industrial kilns in long-term high temperature environments
high alumina refractory bricks is mainly used around the furnace cover, electrode holes and exhaust holes of electric furnaces, and its service life is 1 to 2 times longer than that of silica bricks.
Insulating high alumina refractory bricks mainly refer to refractory products with an aluminum content of more than 48%. They are also called lightweight high-alumina bricks or heat-insulating high-alumina bricks due to their advantages of low bulk density, light weight, and good heat insulation effect. . It is a kind of thermal insulation refractory brick commonly used in high temperature industrial kilns and thermal equipment.
Magnesia alumina bricks use periclase as the main crystal phase and magnesia-alumina spinel as the matrix. They are better in thermal shock resistance than magnesia bricks. In order to improve the thermal shock resistance of magnesia bricks, alumina or alumina is introduced into the ingredients. Bauxite clinker fine powder to form a magnesia-alumina sharp stone matrix, thereby making magnesia-alumina bricks
Magnesia chrome bricks are refractory products with magnesia (MgO) and chromium trioxide (Cr2O3) as the main components, and periclase and spinel as the main mineral components. The main raw materials for the manufacture of magnesia-chrome bricks are sintered magnesia and chromite.
Anti stripping high alumina bricks are referred to as anti-stripping bricks or anti-stripping refractory bricks. Anti-stripping high-alumina bricks are widely used in my country's new dry process kiln, Libore kiln and wet process kiln, including kiln door cover, rising flue, cooling zone, decomposition zone, safety belt, transition zone, coolant rear Walls and side walls and beams with curved ceilings.
Yuying Refractory produces a complete set of refractories for electrolyzers, and the new impermeable bricks are used in conjunction with impermeable castables
The high-alumina bricks are mainly used in the regenerator of the hot blast stove. The lattice bricks with a certain structure are arranged in an orderly manner, and the upper and lower through holes of the lattice bricks can allow the gas to pass through.