Yellow-soil foundry sand and preparation method thereof

Abstract

Yellow-soil foundry sand is characterized by comprising, by weight, 300-330 parts of yellow soil, 100-120 parts of lead-zinc slag powder, 3-5 parts of nanometer titania, 80-90 parts of cornstalks, 1-2 parts of methyl methacrylate, 1-2 parts of lauryl sodium sulfate, 30-35 parts of shell powder, 10-15 parts of titanium dioxide, 2-3 parts of acrylic emulsion, 25-30 parts of vermiculite and proper parts of water. The yellow soil and the lead-zinc slag powder are calcined, smashed and then re-calcined at a high temperature, so that part of viscidity of the yellow soil is maintained, breathability and collapsibility of the yellow soil are improved, and the yellow soil does not crack during drying; the cornstalks are used in combination, breathability is improved, and cost is saved; through adding of the nanometer titania and the titanium dioxide, collapsibility and smoothness of the foundry sand are improved, and shrinking percentage is reduced; the yellow-soil foundry sand is low in cost, sand is not adhered to the produced castings, rate of finished products is increased, and economic benefit is high.

Description

Technical field [0001] The invention relates to the field of casting, in particular to a loam moulding 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 foundry, molding sand binder, and auxiliary additives in a certain proportion. Natural clay-containing silica sand can also be used. The usual molding sand formulations for aluminum casting have too large a particle size or Too small, the sand diameter is too large, although the air permeability is good, the surface of the aluminum sand part is relatively rough, the smoothness is not good, and the sand diameter is too small, resulting in poor air permeability of the sand mold and pores in the aluminum casting. The pulverized clay green sand, which is widely used at home and abroad, is generally made by mixing raw sand, binders, pulverized coal additives, etc. with water. It ha...

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.