Customers' Requirement Refractory Brick with and 0% CrO Content in Vietnam

 Brief introduction of white corundum mullite brick
Corundum and mullite bricks refer to high-alumina refractory products composed of main crystal phases of corundum and mullite. Corundum-mullite bricks refer to refractory products made of high-purity or relatively pure raw materials. The presence of low melting point oxide impurities will reduce its high temperature performance. Use industrial alumina powder and pure clay, bauxite or silica as raw materials to synthesize pure mullite raw materials, especially the content of alkali metal oxides should be as low as possible.

Composition of white corundum mullite brick

Corundum and mullite bricks are made of corundum and mullite as the main raw materials, and are fired at high temperature in an oxidizing atmosphere by adding appropriate amounts of alumina, silica ultrafine powder and additives. The content of AL2O3 is 72%~90%.

Advantages and characteristics of white corundum mullite brick

(1) High temperature resistance, high refractory temperature and high load softening temperature.

(2) Chemical resistance, strong resistance to acidic solutions or molten slag.

(3) Antioxidant. It is not easy to react with O2, H2, CO and other gases.

(4) Good thermal stability, stable volume at high temperature, not easy to expand or shrink.

(5) Good thermal shock resistance, resistance to rapid cold and heat and not easy to peel off.

(6) High compressive strength at room temperature, and it is not easy to wear when handling or unloading.

 Use of white corundum mullite brick

white corundum mullite brick can be directly exposed to flame, peel off, and high temperature resistance. They can be used as heat insulation linings for high-temperature industrial furnaces and working layers for other industrial high-temperature furnaces. They are mainly used in petrochemical industry and large and medium-sized synthetic ammonia gasification. Furnace and magnetic materials, gas furnace materials, high-temperature industrial furnace supporting facilities materials.

Production process of white corundum mullite brick

The corundum mullite brick body is formed by a 300t friction press, and the body density is 2.7g/cm3. The body is dried in a tunnel dryer. The inlet temperature is 40~50℃, the highest drying temperature is 130℃, the drying time is 48h, and the body moisture is not more than 1.5%. The products are fired in a tunnel kiln, the firing temperature is 1550℃, and the holding time is 10h.

Method for forming white corundum mullite brick

(1) Refractory products with complex shapes and larger sizes are rammed or vibrated by air hammer.

(2) Common products or standard sizes can be formed by semi-dry high pressure forming.

(3) Special-shaped pure or special products need to design molds and adopt isostatic pressing.

1.Production Process

1)Raw material to factory→checkout→burdening→stirring→mixing→taking out the raw material,
2)Crushing→Mixing→Shaping→Drying→Firing→Inspection→Packaging and Shipment.

2.Quality Assurance Process

1)Going out the furnace→checkout→packing→qualified product→putting in storage→sale,
2)The process from raw to product are strictly tested by equipment.
    1.Inspection and Control of incoming raw materials: according to the chemical content,raw materials are classified into different levels to ensure quality of brick first.
    2.Inspection and control of the process: during the production,every brick will be weighed twice strictly to reduce the error of weight .
    3.Quality audit by quality management:  inspection of product standardization of quality of each product by process control and experimentation, taking corrective measures timely whenever deviations are noted.
    4.Before delivery, the inspectors will inspect the size,appearance, physical and chemical properties of brick again in factory.

 Packaging of white corundum mullite brick

 Shipping of white corundum mullite brick

1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quanlity and quantity guaranteed, and also in accordance with the contract and customer's requirment completely.

Contact us:

Josie Xiao
Mobile Phone:+8618037198058
WeChat / Whatsapp / Skype: +8618037198058
E-mail: sales03(at)firebricks-supplies.com