Fused ceramic sand used on Furan Resin Sand
If the original sand is replaced by Fused Ceramic sand in production, many problems encountered in the production of furan resin self-hardening sand process can be well solved.
Raw sand: Fused Ceramic sand is an artificial sand mainly composed of Al2O3. Generally, the content of alumina is more than 70%. The alumina is neutral at room temperature. It basically does not react with the resin and curing agent in furan resin, which can effectively reduce the acid consumption value and improve the quality of castings.
Fused Ceramic Sand Advantages
One of the advantages of Fused Ceramic sand is good air permeability. Fused Ceramic sand has strong air permeability, and it is a star particle, which is very suitable for the foundry industry. These advantages are of great help to improve the quality of castings. Fused Ceramic sand overcomes the shortcomings that quartz sand can't overcome: the sand mold specification is small, and the sand mold can't be selected according to the production demand, the expansion coefficient is large, the collapsibility is poor, the fire resistance is low, the casting is easy to expand, the fluidity is poor, and the air permeability is poor. Fused Ceramic sand has the advantages of low coefficient of thermal expansion and comparable performance with zircon sand. When it is used to prepare molding sand, castings will not have expansion defects. Fused Ceramic sand has high refractoriness and good collapsibility. It is a neutral material, suitable for acid-base binder, and is a good casting sand.
The addition of resin and curing agent decreased significantly. The strength of molding sand is still higher than that of silica sand after the addition of resin is reduced by 40%. The corresponding irritant gas has been properly improved. At the same time, the amount of resin added is reduced, the overall gas emission is reduced, and the porosity defects are significantly reduced.
Fused ceramic sand VS silica sand
Silica sand recovery and regeneration generally adopts thermal method, which consumes a lot of energy. Silica sand recovery adopts mechanical method, which will be broken during the regeneration process, the overall molding sand particle size will become finer, the corresponding resin addition will further increase, and the exhaust property of molding sand will become worse. Fused Ceramic sand can be regenerated by thermal method or mechanical friction method. No matter which kind of regeneration, the particle size of Fused Ceramic sand will basically not change, which can effectively ensure the stability of casting quality.
Silica sand is polygonal sand, and the draft angle of small and medium-sized parts in the mold design is generally designed at about 1%. Fused Ceramic sand is spherical, and the relative friction is smaller than that of silica sand. The draft angle can be reduced accordingly, saving the cost of subsequent machining. The recovery rate of silica sand is low, the general regeneration rate is 90% ~ 95%, and more solid wastes are generated. The recovery rate of Fused Ceramic sand can reach more than 98%, effectively reducing the discharge of solid waste.
Fused Ceramic sand has high refractoriness, nearly spherical particle shape and good fluidity. In the production process of nodular cast iron, there are basically no sand sticking defects. It can effectively reduce the workload of cleaning and grinding.