What is the production process of alumina refractory bricks?

High alumina refractory bricks are mainly used for blast furnace linings., hot blast furnaces, electric furnace roofs, blast furnaces, reverberatory kilns and rotary kilns. The demand for alumina refractory bricks is very high. Below is the specific production process of high alumina refractory bricks.

Процесс производства огнеупорного кирпича из глинозема

Ниже рассказывается о процессе производства огнеупорных материалов: preparation of raw materials → mixing of materials → molding → drying → sintering → cooling and quality control → packaging and storage.

Preparation of raw materials

Choose high purity aluminum oxide powder as the main raw material (Al2O3). Depending on the need, some auxiliary materials can be added, such as clay, quartz sand, silicon oxide, etc.. The choice and ratio of raw materials will affect the characteristics of the final product.

Mix of materials

Mix high purity aluminum oxide powder and auxiliary materials in a certain proportion, to ensure even distribution of the various components. The mixing process can be carried out dry or wet.

Formative

Mixed raw materials are molded using a molding machine. Распространенные методы формования включают экструзионное формование, компрессионное формование и литье под давлением. By molding, blanks of the desired size and shape can be obtained.

Dry

Shaped bricks need to be dried, to remove moisture from them. They are usually dried naturally or heated in the oven..

Sintering

The dried bricks are placed in a high temperature sintering oven. Sintering temperature usually exceeds 1500°C, and at high temperatures, adobe undergoes particle gluing, grain growth and compaction. This allows the alumina powder in the adobe to react chemically to form a high temperature resistant mineral phase.

Cooling and QA

After sintering, the adobe must undergo a cooling process. Then a quality check is carried out, including visual inspection, checking dimensions, analysis of chemical composition, etc.. Purpose of quality control – make sure, that the product meets established standards and requirements.

Packaging and storage

High alumina bricks are protected by packaging, and common packing methods include wooden crates, pallets, etc.. Care should be taken during storage and transportation, to protect high alumina bricks from moisture, vibration and other mechanical damage.

What factors are associated with the refractory temperature of high alumina bricks?

The fire resistance of bricks with high alumina content varies widely, обычно при температуре 1770-2000°C, в основном зависит от содержания Also, и увеличивается с увеличением содержания AlO в продукте. At the same time, refractoriness is also affected by the content and type of impurities and is related to the structure of the mineral phase of the product.