A kind of environment-friendly foundry sand and preparation method thereof

Abstract

The invention discloses environment-friendly casting molding sand which is made of the following raw materials in parts by weight: 200-230 parts of quartz sand, 50-60 parts of sodium bentonite, 20-30 parts of red soil, 30-40 parts of talcum powder, 20-30 parts of zinc oxide, 20-24 parts of Chinese medicine residue, 40-45 parts of straw powder, 2-3 parts of carboxymethyl cellulose, 5-8 parts of brown sugar, 1-2 parts of fatty alcohol polyoxyethylene ether, 40-50 parts of brick trash powder, 2-3 parts of boric acid, 40-45 parts of perlite, 2-3 parts of polyving alcohol, 1-2 parts of tung oil, 30-35 parts of bamboo charcoal and a proper amount of water. According to the invention, the brick trash powder is adopted, the Chinese medicine residue, the straw powder and the like are sintered at high temperate, the sand is loosened, breathable and good in collapsibility and is environmental-friendly and energy-saving, and with the combination of talcum powder, the dispersity and the plasticity are improved; due to adoption of brown sugar, tung oil and carboxymethyl cellulose as binding agents, the sand is not only good in binding effect, but also not affected in collapsibility at high temperature; the pass percent of cast pieces is improved, and the casting cost is lowered.

Description

technical field [0001] The invention relates to the field of casting, in particular to an environment-friendly foundry 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, ...

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.