Why Do Refractory Brick Composition Analysis

The analysis of the chemical composition of refractory bricks is a method of applying chemical and physical principles to determine the composition of the chemical composition. Divided into qualitative analysis (identifying components) and quantitative analysis (determining the content of the component). Its chemical composition analysis includes chemical wet analysis and instrumental analysis.

Refractory brick is a mineral composition, and the nature of the brick is a comprehensive reflection of its constituent minerals and microstructure. On this point, refer to the chemical mineral composition of refractory materials in detail. Therefore, when analyzing the influence of composition on its properties, it is not comprehensive enough to analyze and investigate the problem from the chemical composition alone, and the chemical mineral composition should be further observed.

Chemical wet analysis (analysis based on chemical reaction) includes weight analysis and volume analysis; instrument analysis includes optical analysis and electrochemical analysis. The instrumental analysis used for refractory bricks mainly includes fluorescence X-ray spectroscopy, atomic absorption spectroscopy, flame photometric analysis, and colorimetric analysis. The result of chemical composition analysis is to judge whether the chemical composition meets the requirements specified in the standard, and it is also the main basis for the quality standard in the production process. There are 60 national and industry standards for chemical composition analysis in China.

Under the condition of fixed chemical composition of refractory bricks, due to the uniformity of composition distribution and the difference in processing technology, the types, quantities, grain sizes, and bonding states of the minerals in the brick composition are different. This difference in microstructure causes The performance difference of bricks. For example, for siliceous bricks with the same SiO2 content, because SiO2 can form two minerals with different structures and properties under different process conditions-tridymite and cristobalite, some properties of the brick will be different. Even if the mineral composition of the refractory brick is constant, the different crystal grain size, shape and distribution of the mineral phase will also have a significant impact on the properties of the brick.

There are various types of refractory bricks, and their mineral composition is generally divided into two categories: main crystal phase and matrix phase. The main crystalline phase refers to the component that constitutes the main body of the structure and has a higher melting point. The main components in the brick vary according to the components of the balance system and their relative content. The crystal phase, quantity and bonding state of the main components directly determine the properties of the brick.