Reasonable selection of fused zirconium corundum bricks, these 5 principles should be kept in mind

Reasonable selection of fused zirconium corundum bricks, these 5 principles should be kept in mind:

In recent years, with the digestion and absorption of imported technology, the advancement of kiln technology has continuously increased the quality requirements for tilt-cast fused zirconium corundum bricks, and the dosage has continued to expand. As a manufacturing plant, the production process of tilt-cast bricks has been updated and improved, which has brought the quality of the products to a relatively high level and basically reached the international advanced level of similar products. The new process highlights the characteristics of tilted cast bricks. After strictly optimizing the tilt angle, strict quality control is achieved, so that the shrinkage cavity distribution of the product is very reasonable.

The demand for fused zirconium corundum bricks cast without shrinkage holes has been increasing day by day in recent years. In addition to the 41# fused zirconium corundum bricks that are almost all cast without shrinkage holes, the demand for oxidation method 33# fused zirconium corundum bricks without shrinkage holes is also increasing. Usage has also increased considerably. The production cost of this product is high and the production process is relatively complex, so the product sells for a higher price. In recent years, glass melting furnaces using dense end-cast bricks have also appeared in China. This product is mostly used on pool walls. From the perspective of manufacturing fused bricks, the process is simpler than shrinkage-free casting, and the manufacturing cost is also lower. It is relatively lower, and the sales price is certainly different, but the performance on the pool wall is almost the same as that of non-shrinkage cast bricks.

The basic principles for the reasonable selection of fused zirconium corundum bricks with the above casting methods are:

(1) The pool wall bricks in contact with the molten glass use oxidation method 33# tilt-cast zirconium corundum bricks. This choice is relatively reasonable both technically and economically. If you take into account the need for bricks in the later stages of the furnace, it is even more foolproof to make slight changes in the brick type. Of course, compared with the traditional bottom-up multi-layer brick construction of the pool wall, this choice of pool wall bricks has more advantages than disadvantages, but there is also the problem of considering one at the expense of the other. Therefore, many furnace designers are still accustomed to traditional tank wall structures. It should be pointed out that it is a better choice to use 20mm thick 44# non-shrinkage AZS bricks for the upper pool wall, while the lower part can successively reduce the quality grade of the pool wall bricks. It is worth noting that when choosing multiple varieties of pool wall tiles, attention should be paid to the grade gap between adjacent fused bricks and tiles should not be too large. Because from the perspective of the production of various types of refractory materials, there are great differences in physical and chemical indicators, mineral composition, and performance between high- and low-grade materials. It is technically and economically unreasonable to use adjacent materials together.

(2) The upper structure of the furnace can almost always be made of ordinary cast fused zirconium corundum bricks, and their functions are fully sufficient.

(3) For melting furnaces with kiln bottom insulation, 75mm thick oxidation method 33# non-shrinkage cavity AZS bricks are suitable for the kiln bottom pavement, and are used in conjunction with zirconium corundum ramming materials during construction.

(4) The side walls, flat bricks and inclined bricks of small furnaces are generally made of 33# zirconium corundum bricks with ordinary casting reduction method, while the bottom of the furnace can also be made of 33# zirconium corundum bricks without shrinkage holes or densely cast.

(5) The walls of the clarification part should be made of ordinary cast α-β alumina bricks as much as possible, and the kiln bottom should be made of α-β alumina bricks cast without shrinkage holes. The cost of the kiln of this choice is higher, and oxidation can also be used,replace it with 33#AZS bricks