Process Flow For Casting Technology Of Fused Cast Bricks
2015-06-19
Casting is a technology to produce refractories, like fused cast azs brick, fused cast alumina block, fused cast high zirconia block. These bricks can be used in the liner of glass furnace, such the tank bottom, side wall, throat, fore hearth, corner, doghouse,etc.
The specific production flow of casting 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 bricks.
2. Melting in electronic furnace
According to the requirements of production plan, put the proportioned raw materials into a special electric arc furnace and melt under optimum conditions and moderate temperature, as low temperature is easy to lead to uneven fused cast bricks, forming a porous body and cracks, and increasing shrinkage accordingly.
3. Casting in the mold
Pouring the molten materials into the product mold which is specially designed. When using properly superheated melt casting, shrinkage hole of fused cast bricks are concentrated, thickness of the dense region increases and density of the whole product increases. However, if the degree of overheating is too high, although the melting density has increased, but it is easy to make fused cast bricks forming cracks and big shrinkage hole.
4. Cooling
Slowly cool down the casted fused cast bricks, make the crystal of fused cast bricks growing and forming the best structure. Generally, insulation box filled with diatomite is used to anneal the blocks with mold or resistance furnace which can adjust temperature is used to anneal. The initial temperature and heat insulation have obvious effect on annealing effect.
5. Surface machining
Examine the defects on surface, brick size, accuracy of every fused cast bricks then make high precision grinding according to customer’s requirement to ensure the accuracy of its size. Mechanical machining is the means to improve the quality of fused cast bricks and prolong its service life.
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