High-aluminium bauxite cast-moulding sand and preparation method thereof

Abstract

Disclosed are high-aluminium bauxite cast-moulding sand and a preparation method thereof. The high-aluminium bauxite cast-moulding sand is characterized by being made of raw materials including, by weight, 80-90 parts of high-aluminium bauxite, 10-16 parts of dilute phosphoric acid solution, 2-3 parts of seignette salt, 3-4 parts of zinc chloride, 1-2 parts of nanometer titania, 45-50 parts of aluminium silicate, 30-40 parts of corn stalk powder, 2-3 parts of leaves powder, 1-2 parts of aluminite powder, 55-60 parts of bentonite, 4-5 parts of sodium metasilicate and a moderate amount of water. Since the high-aluminium bauxite added with the dilute phosphoric acid solution is subjected to calcination, cohesiveness and breathability of the high-aluminium bauxite are improved; by means of adding the corn stalk powder into the high-aluminium bauxite, breathability of the cast-moulding sand is improved, cost is lowered and environmental protection and energy saving are achieved; being added with the nanometer titania and the aluminite powder, the cast-moulding sand is enabled to be good in thermal conductivity. The high-aluminium bauxite cast-moulding sand is smooth, easy to mould, prone to collapsing at high temperature, fast in cooling, timesaving and environmentally friendly, a foundry piece is less prone to bonding with sand, sand buckling is remarkably reduced, brightness of the foundry piece is greatly improved, and economic benefit is increased.

Description

technical field [0001] The invention relates to the field of casting, in particular to high alumina casting sand and a preparation method thereof. Background technique [0002] Molding sand is a material used for molding in casting. Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. In the usual molding sand formula for aluminum casting, the particle size of the molding sand is too large or If it is too small, the diameter of the molding sand is too large. Although the air permeability is good, the surface of the aluminum sand parts is rough and the finish is not good. If the diameter of the molding sand is too small, the air permeability of the sand mold is not good, and the aluminum castings have pores. Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, binders, co...

AI Technical Summary

Problems solved by technology

Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. In the usual molding sand formula for aluminum casting, the particle size of the molding sand is too large or If it is too small, the diameter of the sand material is too large. Although the air permeability is good, the surface of the aluminum sand parts is rough and the finish is not good. The diameter of the sand material is too small, resulting in poor air permeability of the sand mold and air holes in the aluminum casting

Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, binders, coal powder additives, etc. and water. It has a certain anti-sticking sand effect, low material cost, and high production efficiency. However, its consumption is large, the emission is serious, and the coal powder is burned and decomposed in the casting process to produce toxic gas pollution.