What are the standards for refractory materials used in glass kilns?

What are the standards for refractory materials used in glass kilns?

Glass production furnaces and kiln pools are inseparable from refractory materials. The forming, annealing, and cooling of glass all need to be completed in structures with refractory materials.

Commonly used refractory materials in float glass kilns include silica bricks, clay bricks, high alumina refractory materials, alkaline refractory materials (magnesium-containing refractory materials), fused refractory materials, lightweight refractory materials and unshaped refractory materials.

When selecting refractory materials for a glass melting furnace, you need to understand the following factors: the service life of the furnace, glass quality requirements, production capacity (melting rate and melting temperature), insulation conditions, and which parts need to save fuel and adopt insulation measures. The last thing is to consider economy.

After understanding the above factors, you need to follow the following refractory material selection principles to achieve the purpose of improving the quality and output of glass products, saving fuel, extending the service life of the furnace, and reducing the cost of glass production.

The refractory material of the glass melting furnace must have sufficient mechanical strength, be able to withstand the mechanical load at high temperatures, have a fairly high refractoriness, and must also have chemical stability and resistance to the erosion of molten glass at the operating temperature. It must not be resistant to the glass liquid. The pollution produced or the pollution is minimal and cannot affect the quality of the glass liquid. It must have good thermal shock resistance and the shrinkage and thermal expansion rate during reburning must be small.

At the same time, it is also necessary to pay attention to the fact that refractory materials of different materials are put together to prevent contact reaction.

In the actual production process, many purchasing units still make mistakes based on knowing the above principles. They purchase poor refractory materials, which not only limits the operating temperature of the furnace, but also seriously damages the quality of the glass and produces stones. , defects such as streaks, bubbles and unnecessary coloring

Let’s take the stones that appear in glass production as an example to analyze. The sources of stone crystals may be the following:

Cristobalite, tridymite: unmelted batch materials, silica bricks, silica mortar accidentally entering the glass, crucible clay, clay refractory materials; Quartz: unmelted batch materials, quartz sand entering the glass, crucible Clay, clay refractory materials, etc. form stones: zirconium dioxide or zirconium silicate contained in refractory bricks can also easily form glass stones. In addition, chromium oxide, trefoil, iron and other compounds, hurlite, lead, etc. in refractory materials Excessive content of these elements such as silicon or improper use may cause stone defects.

Once the refractory materials used are inappropriate, the molten glass will be in contact with the refractory materials at high temperatures for a long time after melting, which will lead to adverse results and ultimately affect the product quality of the glass.

Therefore, when selling and purchasing refractory materials, national standards must be followed. The current standards for refractory materials in the glass industry that everyone has! Includes I Factory 4952013 zircon bricks for glass furnaces, JC/T 493-2015 cast zirconium corundum refractory products for glass furnaces, JC/T 638-2013 for glass furnaces Low porosity clay bricks, JC Factory T 494-2013 cast alumina refractory products for glass melting furnaces, C/T 604-2013 float glass annealing kiln, YB/T 147-2007 silica bricks for glass furnaces, YBЛT 4578-2016 Fused quartz bricks, JC/T 926-2003 tin bath bottom bricks for float glass kilns, JC/T 925-2003 AZS bricks for glass kilns, JC/T924-2003 magnesia bricks (MaO295%) for Bo Yao kilns, JC Factory 616-2003 High-quality silica bricks for Bo Yao kiln, IC Factory T639-2013 Test method for bubble precipitation rate of refractory materials for glass melting furnaces, JC/T806-2013 Test method for static glass liquid erosion resistance of refractory materials for glass baking kilns.