Additive for wet clay sand and preparation method of additive

Abstract

The invention relates to an additive for wet clay sand and a preparation method of the additive. The additive is prepared from the raw materials: sodium bentonite, pulverized fuel ash, coal series kaolinite and plant ash. The prepared additive can be moulded without the addition of pulverized coal and pottery clay, and is nontoxic, tasteless, smokeless, dust-free, and clean, the atmospheric dust pollution is reduced, the air quality is improved, the ecological environment is improved, and the health of the masses is ensured; and moulding sand prepared from the addition has a sand adherence prevention effect, and a casting has a smooth and fine surface, and has high toughness. Since no gas generated by pulverized coal exists, the air permeability mechanism of moulding sand is improved, wastes of casting shrinkage porosities and cavities and subcutaneous blowholes due to low air permeability are reduced, the finished product rate of the casting is effectively improved, and the inherent quality is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of green sand, and in particular relates to an additive for clay green sand and a preparation method thereof. Background technique [0002] At present, the castings produced by sand casting account for 80% of the total castings. Sand casting molding materials play an important role in production, which directly affects the energy consumption, environmental pollution, and casting quality, production efficiency and cost of casting production. Widely used coal powder clay green sand is generally formed by mixing raw sand, binders, coal powder additives, etc. Large, serious emissions. [0003] In order to avoid defects such as sand sticking and sand inclusions in castings, a certain amount of coal powder and clay should be added to the green sand. The volatile matter in the coal powder is pyrolyzed under high temperature conditions to form a layer of carbon film coated on the mold-metal interface. , It acts as...

AI Technical Summary

Problems solved by technology

Another important property of pulverized coal is softening and coking at 500-600°C. This spongy substance filled between the pores of the gravel can absorb the violent expansion of quartz sand at around 600°C, thereby reducing the formation of mold sand due to expansion. However, when the coal powder is poured at high temperature, it will burn, which will generate a large amount of smoke and cause air pollution, causing air pollution. The clay is prone to dust, and the PM value is not up to standard, which will also cause haze in the air.

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