- Time:Jun 13, 2023
Alkaline refractory is a special refractory, mainly composed of high melting point oxides such as magnesium oxide (MgO), aluminum oxide (Al2O3) and auxiliary additives. Alkaline refractories have excellent alkali corrosion resistance and can be used in the production of refractory components in various strong alkali environments. Here is a detailed introduction to the production process of alkaline refractories.
1. Raw material preparation
First, raw materials such as magnesia and alumina are mixed evenly in a certain proportion, and then processed into granules (such as pressing balls or extruding) to make them have certain plasticity and formability. Commonly used auxiliary additives include polysilicate (such as talc), calcium carbonate, red mud, etc.
2. Molding treatment
The pretreated raw materials are formed into refractory blanks of different shapes and specifications by pressing, extruding, casting, etc. Among them, the extrusion method is a common molding method, that is, the pretreated material is filled into the injection machine, and the material is extruded by high pressure to form a rod-shaped green body with a diameter of about 25mm to 75mm.
3. Drying treatment
The molded green body is dried by natural air or hot air to remove part of the water and improve the strength. In this step, it is necessary to pay attention to controlling the drying temperature and time to avoid problems such as cracks or deformation.
4. Sintering treatment
The dried green body is put into a resistance furnace and sintered at a high temperature (usually 1600°C to 1800°C) to make its internal structure form crystals and enhance its fire resistance and mechanical strength. In addition, the alkali corrosion resistance of the material can be further improved by adding a small amount of additives such as calcium fluoride and magnesium fluoride during the sintering process.
5. Subsequent processing
Cutting, grinding, polishing and other subsequent processing are carried out on the sintered material to meet different use environments and requirements. Among them, it is also necessary to carry out quality inspection and quality control on the materials to ensure that the products meet the refractory industry standards and customer requirements.
It should be noted that the above production process is only a general reference, and the actual production process needs to be adjusted and improved according to specific needs and requirements to improve product quality and efficiency. At the same time, the composition and ratio of basic refractory materials will also affect their performance and application range, and should be selected according to the specific use environment and requirements.
