Refractory For Glass Furnace

1. Clay bricks for Glass Furnace

There are different varieties of clay bricks, such as low porosity clay bricks, ultra-low porosity clay bricks, low creep, low porosity, low iron clay bricks and so on. Therefore, clay products should be used as refractories for acid kilns.

2. Silica brick for Glass Furnace

Silicon refractory is an acid material, it has strong resistance to acid slag or solution erosion, and has good high temperature performance: for example, the refractoriness is 1690-1730 ℃, and the load softening starting temperature is 1640-1680 ℃. The volume expansion rate is relatively large, and the total volume expansion generated when the temperature is 1450 ° C is conducive to ensuring the structural strength and air tightness of the masonry. Therefore, silica bricks are the main material of glass kilns, and are widely used in large sills, parapets, roofs of regenerators, etc.

3. Fused zirconium corundum brick for Glass Furnace

AZS-33 products are particularly superior in preventing contamination of the molten glass. It has little tendency to cause stones, bubbles and the precipitation of the basic glass phase in the glass. It is suitable for the upper structure of the melting pool, the pool wall bricks and paving bricks of the working pool, the forehearth, etc.

AZS-36 is a standard oxidation method fused zirconium corundum brick, which has the characteristics of high resistance to glass erosion and low pollution, and the performance in these two aspects is balanced. It is suitable for the parts in the glass melting furnace that are in direct contact with the glass liquid, such as melting pool wall bricks, paving bricks, feeding ports, etc.

AZS-41 is the highest grade fused zirconium corundum brick by oxidation method. It has the highest corrosion resistance to molten glass and excellent low pollution to molten glass. It is suitable for parts in glass furnaces that require particularly high corrosion resistance, such as all-electric melting furnaces, liquid flow holes, kiln sills, bubbling, bricks at the corner of the feeding port, etc.

4. Fused Corundum Brick for Glass Furnace

The main crystal phase of corundum brick is corundum, which has excellent properties, such as high melting point, high hardness, and is a neutral mineral, so the product has high hardness, erosion resistance, wear resistance, and corrosion resistance. Cast α-Al2O3 bricks are mainly composed of α-type corundum and solid fine-grained structure entities. Mainly used in glass kilns. Suitable for melting borosilicate glass and opal glass. However, its high temperature corrosion resistance is poor. When it is at a high temperature of 1600 ° C, the corrosion resistance of glass liquid will decrease rapidly, so some borosilicate glass kilns tend to use fused silica bricks. The fused-cast α-Al2O3 brick products have a bulk density of 3.15-3.30g/cm3, contain a small amount of glass phase (about 2%), fill the inter-crystal voids, and have high purity. Because it does not pollute the molten glass, and has good corrosion resistance of molten glass and excellent high temperature wear resistance below 1350 ° C, it is an ideal refractory part of the clarification part, cooling part, working pool and other parts of the glass melting furnace. Material.

β-Al2O3 is a white product composed of coarse and bright crystals, containing 92%-95% of Al2O3, only less than 1% of the glass phase, and the structural strength of the product is low due to the loose lattice. The Na2O contained in β-Al2O3 reacts with SiO2, resulting in a large volume shrinkage, which may cause cracks and damage to the bricks. Therefore, it is only suitable for the superstructure containing SiO2 fly ash, for example, the superstructure of the working pool, the breast wall near the combustion port, the small furnace nozzle and the hanging wall. Because this brick does not interact with volatile alkali metal oxides, there is no fear of contaminating the glass by dripping molten material from the brick surface.

5. Magnesium refractory for Glass Furnace

Generally, high-grade magnesia bricks (w(MgO) > 97%) are used for the uppermost layer of the regenerator lattice.