{"id":159,"date":"2020-11-26T06:56:57","date_gmt":"2020-11-26T06:56:57","guid":{"rendered":"https:\/\/kilnrefractory.com\/blog\/?p=159"},"modified":"2020-11-26T06:56:57","modified_gmt":"2020-11-26T06:56:57","slug":"service-life-of-silica-bricks-in-glass-melting-furnaces","status":"publish","type":"post","link":"https:\/\/kilnrefractory.com\/blog\/2020\/11\/26\/service-life-of-silica-bricks-in-glass-melting-furnaces\/","title":{"rendered":"Methods of Increasing the Service Life of Silica Bricks in Glass Melting Furnaces"},"content":{"rendered":"

Traditional and new refractory materials are used for glass kiln construction and repair. Traditional refractory materials for industrial use<\/a> include clay bricks, dense clay bricks, mullite silica bricks, mullite bricks, mullite corundum bricks, and corundum bricks. High-temperature insulation materials and high-purity magnesium spinel refractory materials. Unshaped refractories include plasticized aluminum silicate cement, high-alumina cement, and low-cement castables.<\/p>\n

\"Silica
Silica Bricks for the Glass Kiln<\/figcaption><\/figure>\n

The use of refractory materials in glass melting furnaces. Silica bricks<\/a> are widely used in glass melting furnaces, and the main component is silicon dioxide (SiO\u2082). The silica brick used in the glass melting furnace requires a SiO\u2082 content of 94% or more, a maximum operating temperature of about 1600~1650\u2103, and a density of 1.8~1.95g\/cm\u00b3. The apparent porosity is required to be less than 22%. The larger the porosity, the worse the quality of the silica brick. The appearance of silica bricks is mostly white crystals, and the microscopic composition is tridymite crystals. Because silicon bricks undergo crystallization conversion and volume expansion at high temperatures, especially at 180~270\u2103 and 573\u2103, the crystallization conversion becomes more intense. Therefore, in the process of the baking kiln and cold repair, it is necessary to adapt to the crystal transformation of silica bricks and take appropriate measures such as elastic strips. The silicon brick masonry should be left with expansion joints.<\/p>\n

\"Rongsheng
Rongsheng Silica Bricks for Sale<\/figcaption><\/figure>\n

How to Improve the Performance of Silica Brick in a Glass Kiln<\/h2>\n

The advantages of siliceous materials are high-temperature strength, good creep resistance, low density, no pollution to glass, and low price. The working temperature of silica bricks is about 200\u2103 higher than that of clay bricks, but the corrosion resistance to molten glass and alkaline flying materials is poor. Therefore, it is used for masonry structures such as masonry, parapets, and small furnaces. When masonry, use high-silicon refractory mud or silica brick powder and other materials close to the composition of silica bricks as the cementing material.<\/p>\n

\"RS
RS High-Quality Silica Bricks<\/figcaption><\/figure>\n

Ways to Improve the Life of Silica Bricks<\/h3>\n

In the 1980s, my country introduced advanced silicon brick<\/a> manufacturing technology for glass kilns from the United States. In order to distinguish it from the original product, the product manufactured with imported technology is called high-quality silica brick. The composition (W) of high-quality silica bricks is cristobalite 45%, phosphorite 50%, glass phase 1%~2%, and a small amount of residual quartz. Melt index (2R2O+Al2O3)<0.5%.<\/p>\n

After adopting oxy-fuel combustion technology, the life of silica bricks has been drastically reduced from 5 to 10 years to 2 to 3 years. Rat holes and erosion are the main causes of damage. The rat-hole is caused by the alkali in the gas leaking from the kiln condensing in the cracks of the brick to corrode the silica brick. The methods to improve the life of silica bricks are as follows:<\/p>\n