2. Pores making process of lightweight refractory materials
The formation of pores is a vital process in the production of lightweight refractories. The size, shape, amount and distribution of the pores directly affect the quality of the product. There are many methods to form pores. In the industrial production of refractory materials in my country, chemical methods, foam methods and combustible materials are mainly used.
(1) Chemical method
Chemical method refers to the addition of some substances that can generate bubbles through chemical reactions in the green brick. Due to the rapid reaction of this method, the formation of bubbles is not easy to control, so an appropriate amount of inhibitor must be added according to the process requirements.
(2) Foam method
The foam method is to add a foaming agent to the mud. Similar to the chemical method, the stability of the bubbles produced by the foam method is not good, and a fixing agent must be added to control it.
The so-called foaming method to produce lightweight bricks is to add a substance with low surface tension to the mud to make it foam, then pour the mud into the mould, and then dry it together with the mould, then fire it at a certain temperature, and then process and reshape the product. Most of the clay and high-aluminum lightweight products can be produced in this way.
Next issue we will continue to introduce pores making process of lightweight refractory materials.
