Artificial nice foundry sand, preparation method and application thereof

Abstract

The invention discloses artificial nice foundry sand which comprises the following components in mass percent: 70 to 85% of Al2O3, 8 to 12% of silicon, 2% of Fe2O3, and the balance of impurities. The nice foundry sand is spherical and ranges from 10 to 180 meshes. A preparation method of the artificial nice foundry sand comprises the steps of: (1) adding bauxite to a container, and roasting into molten liquid; and (2) applying air pressure at 10m / s while the molten liquid of the bauxite flows out from the container, thus obtaining the nice foundry sand. The nice foundry sand is low in price, environment-friendly, resistant to high temperature, low in thermal expansion rate and high in recycling function, and can be widely applied to the casting industry.

Description

technical field [0001] The invention relates to the technical field of molding sand, in particular to artificial pearl sand, a preparation method and application thereof. Background technique [0002] The molding sand used in the foundry industry mainly uses natural silica sand as raw sand, and some use chromite sand, zircon sand, etc. Silica sand has the following disadvantages: 1. Poor thermal stability, phase transition occurs at about 570 ° C, accompanied by large volume expansion, which is the root cause of "expansion defects" in castings; 2. After heating, it expands and is easy to break and pollute the environment. 2 Dust is prone to silicosis, which seriously endangers the health of production workers; 3. The grain shape is not good, the spherical effect is not good, and the air permeability is poor; 4. The recycling rate is low and the regeneration performance is not good. Although chromite sand and zircon sand have better performance, they are too expensive. Con...

AI Technical Summary

Problems solved by technology

Silica sand has the following disadvantages: 1. Poor thermal stability, phase transition occurs at about 570 ° C, accompanied by large volume expansion, which is the root cause of "expansion defects" in castings; 2. After heating, it expands and is easy to break and pollute the environment. 2 Dust is prone to silicosis, which seriously endangers the health of production workers; 3. The grain shape is not good, the spherical effect is not good, and the air permeability is poor; 4. The recycling rate is low and the regeneration performance is not good

Although chromite sand and zircon sand have good performance, they are too expensive