High alumina bricks generally refer to refractory bricks with Al2O3 content >48% or more, mainly based on natural high-grade bauxite, which contains bauxite, boehmite, kaolinite, etc. in high-alumina clinker. Soft or semi-soft clay is added as a binder to start mixing, mixing, molding, drying, and finally firing. The high alumina brick has a refractoriness of about 1770 ° C and a load softening temperature of 1420 ° C to 1550 ° C. Common high alumina bricks are LZ-65, LZ-55, LZ-48 and so on.

High aluminum brick characteristics

1, the load softening temperature is high

2. Good thermal shock resistance.

3. It is resistant to acid, alkali and slag.

High alumina brick use

Metallurgical kiln such as blast furnace, hot blast stove, ladle, rotary kiln lining, high alumina brick can also be used as grid brick in the hot blast stove to build a regenerator.

High aluminum brick classification

1. According to the content of Al2O3, it is divided into: first grade high alumina brick (Al2O3>75%); second grade high alumina brick (Al2O3 in 60%-75%); third grade high alumina brick (Al2O3 in 48%-60%).
       2. according to the firing process is divided into: burning high aluminum bricks and not burning into high aluminum bricks. The firing temperature of the first and second high alumina bricks is between 1500 °C and 1600 °C, and the firing temperature of the third grade high alumina bricks is between 1450 °C and 1500 °C.
       3. according to the mineral composition is divided into: low mullite, mullite, mullite - corundum, corundum mullite and corundum five.
       4. according to the shape is divided into: standard high aluminum brick, shaped high aluminum brick and special high aluminum brick.
       5. according to the characteristics are divided into: ordinary high aluminum bricks and special high aluminum bricks (anti-thermal shock, low creep, anti-flaking high aluminum brick).

High aluminum brick shape and size

      1. Straight bricks are divided into: standard bricks, 3/4 long bricks, double half bricks, double long bricks, double half width bricks, half thick bricks, flat bricks, and long bricks.

      2. Wedge brick: thick wedge brick, side thick wedge brick, vertical wedge brick, double half width thick wedge brick, double wide vertical wedge brick, vertical wide wedge brick.

          High aluminum brick size: general brick size: 230mm × 114mm × 65mm, 300mm × 150mm × 75mm and so on. Straight brick dimensions are: 172 mm x 114 mm x 75 mm, 230 mm x 150 mm x 65 mm. For more high-aluminum brick shape and size, please refer to GB "Refractory Brick Shape Size Table".

How to choose high aluminum brick?

      1. First check whether the test report produced by the manufacturer of the refractory brick meets your needs.

      2. Check whether the size and weight of the high alumina bricks are consistent. (As the case may be)

      3. Check the color of high alumina bricks, the surface of bricks, the corners of bricks, etc.