Characteristics and Selection Guide of Acidic Refractory Materials

Acidic refractory materials, with silicon dioxide as the main component, have core characteristics concentrated on their resistance to acid erosion and adaptability to specific temperatures. They are key consumables in industries such as glass and non-ferrous metals.
I. Core Features
It has outstanding acid resistance and can resist the erosion of acidic slag and flue gas for a long time. Under acidic working conditions, its service life far exceeds that of other types of refractory materials.
High-temperature resistance is greatly influenced by composition. The refractoriness of common siliceous materials is approximately 1670-1730℃, while that of high-siliceous materials can be increased to over 1750℃.
It has relatively weak thermal shock resistance and is prone to cracking when the temperature changes suddenly. It needs to be used in combination with a slow cooling process.
Ii. Key Points for Selection

1. Consider the acidity of the working condition: If the main medium in the furnace is acidic, such as molten glass from a glass kiln or acidic slag from non-ferrous metal smelting, acidic refractory materials should be preferred.
2. Set the temperature range: Select based on the highest temperature inside the furnace. Ordinary silica bricks are suitable for scenarios below 1600℃, while high-silica bricks can be used in high-temperature areas ranging from 1600 to 1700℃.
3. Check structural compatibility: For the parts of the furnace body that are prone to impact, modified acidic refractory materials with added reinforcing fibers can be selected to enhance the impact resistance.