1. Mixing of Magnesia spinel brick

It is carried out in a wheel rolling machine or a sand mixer, and the order of feeding is: granular material → pulp waste liquid → fine powder, and the total mixing time is not less than 10 min. Since the amount of CaO in the raw material is limited and the sintering degree of magnesia is increased, the trapping process is generally eliminated.

2. Forming of Magnesia spinel brick

Therefore, high-pressure molding can be used to make the green body density above 2.95 g/cm3. This helps to improve the performance of refractory bricks.

3. Drying of Magnesia spinel brick

During the drying process of the green body, the physical and chemical changes that occur include the evaporation of water and the hydration of magnesia.  

4. Firing of Magnesia spinel brick

Therefore, the magnesia spinel brick stack should not be too high, generally around 0.8 m. Since the physical and chemical changes that occur during the calcination of materials have been basically completed during the calcination of raw materials, the main mineral composition of refractory bricks can be considered to be basically the same as that of sintered magnesite, except that the degree of reaction close to equilibrium and the uniformity of mineral composition distribution is Improved.