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Formation of shrinkage cavity: In the mold, the molten liquid occurs when the self - shaped wall begins to solidify. If the molten liquid reduces caused by the liquid shrinkage and solid shrinkage and don't get added, which will form concentrated shrinkage cavity in the place of final solidification of fused cast azs block.

magnesia brick is one kind of alkali refractory which is generally produced by sintered method. Below is the specific step for your reference.

1. Raw material’s mixing. Match all the raw material of magnesia brick according to reasonable scale, then mix them with wheel mill which can make the mud material with better quality, Because rotation and pressure of wheel mill on the mud have the effect of rolling compaction, pre scheduling and pre compaction.

There are thousands of refractory manufacturers who can manufacture zircon brickat present market. However, what are the standards to measure a good zircon brick manufacturer? Now Zhengzhou Sunrise Refractory Co., Ltd. as a professional refractory will give some advices from the following aspects for your reference.

The physical and chemical reactions in melting process of fused cast azs block are as below:

1. Alumina
The liquid is crystallized to corundum when cooling

2. Zirconite
it mainly contents zirconium silicate which is decomposed as below:
The melting point of zirconite is 2430 degree, but with the help of flux, the temperature do not need so high, in a word zircon is transferred to baddeleyite from low temperature crystal to high temperature crystal.

3. Soda ash and borax

magnesia brick is an alkali refractory whose main crystal phase is periclase, and the content of MgO is more than 90%. Magnesia brick is made by sintering in high temperature which is through crushing, batching, mixing, molding and sintering at high temperature of 1550 ~ 1600 degrees.

Magnesia brick is the main product of alkali refractories with the good property of slag resistance, superior refractoriness under load, good alkali resistance, strong corrosion resistance and steady volume in high temperature.

After the ordered zircon brick are finished producing, whether you think, as a manufacturer, we can pack the zircon brick and deliver them to customers, in fact it is not like that, before packing, there is another important work we need to perform, that are inspection and pre-assembly which can adjust and optimize the dimensions of each brick.

About inspection

The specific production flow of fused cast azs block is as below:

1. Proportion the raw material
Pre-treat the raw material of oxidized aluminum powder, zircon sand and zirconium and other raw materials, proportion them with computer according to different type of fused cast azs block.

2. Melting in electronic furnace

Zircon is a mineral belonging to the group of nesosilicates. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4. In recent years, zircon has attracted considerable attention as a high-technology material for industrial applications, because of its superior mechanical, thermal, electrical, chemical and optical properties. Due to these special properties, zircon is also widely used in glass industry which is called zircon brick.

All of fused cast azs block 33#,36# and 41# as refractory bricks have the common properties of dense structure, withstanding high temperature, low pollution to glass liquid, high corrosion resistance to glass liquid, and specific chemical composition. However, as the different content of zirconia, fused cast AZS block 33#, 36# and 41# can be used in different part of glass furnace.

zircon brick is manufactured through sintered method. Sintering is a process by pressure and heat without melting it to the point of liquefaction which can compact and form a solid mass of material . Sintered molding method as a general method is widely used in glass industry.

There are four main stages in producing sintered zircon brick: powdering, molding and compacting, drying, and sintering.