What is the chemical treatment process in the manufacturing process of insulating refractory bricks

In the manufacturing process of insulating refractory bricks, the role of chemical treatment cannot be underestimated, which is mainly reflected in the two key stages of mud preparation and firing. The mud preparation stage is the basis for optimizing product performance. Manufacturers accurately select raw materials and perform fine crushing and mixing according to the technical requirements of the final product. In this process, the core of chemical treatment lies in the ratio of raw materials and the reasonable selection of additives. In order to improve the foaming performance of mud, manufacturers usually add an appropriate amount of foaming agent, such as rosin soap. These foaming agents can produce a large number of tiny bubbles in the mud, and then form a porous structure during the firing process, thereby significantly improving the thermal insulation performance of the product.

In addition to foaming agents, the use of other chemical additives is also crucial. For example, if you want to enhance the adhesion and plasticity of the mud, an appropriate amount of binders such as sodium silicate or phosphate will be introduced. These binders react chemically with the oxides in the raw materials to form stable chemical bonds, thereby effectively improving the strength and stability of the mud.

After the mud is prepared, the molding and drying process follows. These two links have a significant impact on the shape and dimensional stability of the product, and chemical treatment at this stage is mainly reflected in the regulation of the properties of the clay. Through precise molding and drying processes, it can be ensured that the product maintains a stable structure and performance during the subsequent firing process.

Entering the firing stage, the importance of chemical treatment becomes more prominent. At this stage, the organic and inorganic substances in the clay will undergo a series of complex chemical reactions, including oxidation, reduction, decomposition and combination. These reactions not only affect the microstructure and performance of the product, but also directly determine the quality of the final product.

During the firing process, the foaming agent is decomposed by heat and releases a large amount of gas, which forms tiny bubbles in the clay. As the firing temperature increases and the insulation time increases, these bubbles gradually stabilize and solidify to form a porous structure. This porous structure not only significantly improves the thermal insulation performance of the product, but also effectively reduces the density and thermal conductivity of the product.

In addition, chemical reactions will also occur between the oxides in the raw materials during the firing process. For example, alumina and silica react at high temperatures to form compounds such as mullite, which can significantly enhance the fire resistance and thermal shock resistance of the product. At the same time, impurities in the raw materials are removed or converted into harmless substances during the firing process, thereby improving the purity and stability of the product.