- Time:Aug 28, 2023
magnesia chrome brick is a commonly used refractory material, which is made of magnesium oxide (MgO) and chromium oxide (Cr2O3) as the main components. The following is the basic production process of magnesia chrome bricks:
1. Raw material preparation: According to the formula requirements, mix the appropriate amount of magnesium oxide and chromium oxide powder in proportion to ensure uniform mixing.
2. Slurry preparation: Mix the mixed magnesium oxide and chromium oxide powder with appropriate amount of water or other additives to form a uniform slurry. At the same time, some auxiliary substances such as binders and plasticizers can be added to improve the plasticity and formability of the slurry.
3. Forming: shape the prepared slurry. Common molding methods include extrusion, pressing, injection molding, etc. Through these forming processes, the slurry is pressed into the shape of the brick.
4. Pre-drying: The formed bricks need to be pre-dried to remove part of the moisture and avoid bursting during sintering.
5. Sintering: Put the pre-dried bricks in a high-temperature furnace for sintering. The sintering temperature is generally between 1500°C and 1750°C. At high temperature, the magnesium oxide and chromium oxide in the magnesia-chrome brick react chemically to form a stable magnesia-chrome spinel phase. This spinel structure endows magnesia-chrome bricks with good refractory properties.
6. Cooling and packaging: The sintered magnesia-chrome bricks need to be cooled and inspected for quality. Accepted bricks will be cleaned, sorted and packaged for shipment or storage.
The entire production process of magnesia-chrome bricks involves steps such as raw material preparation, slurry preparation, molding, pre-drying, sintering and final treatment. Each step requires strict control of process parameters and quality requirements to ensure that the final product has a stable chemical composition, good physical properties and fire resistance.
