Novel molding sand

Abstract

The invention discloses novel molding sand. The novel molding sand is prepared from, by weight, 120-140 parts of quartz sand, 25-30 parts of bentonite, 10-15 parts of zeolite powder, 5-8 parts of gypsum powder, 2-3 parts of Chinese medicine residues, 1-2 parts of carbon powder, 3-4 parts of modified starch, 15-20 parts of aluminum oxide and 3-5 parts of vitrified microspheres. The novel molding sand is good in breathability, liquidity and high-temperature collapsibility. A sand mold is high in dry strength, high in wet bonding power, and good in anti-adhesive sand capacity, so that machined castings are smooth and glossy in surface, and high in finished product rate. Besides, the novel molding sand is capable of improving the operating environment of personnel, reusing waste and being good for the environment.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a novel molding sand. 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, and natural silica sand containing clay can also be used. Inappropriate, the diameter of the molding sand is too large. Although the air permeability is good, the surface of the casting is rough and the finish is not good. The diameter of the molding sand is too small, resulting in poor air permeability of the sand mold and pores in the 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 la...

AI Technical Summary

Problems solved by technology

[0003] my country is a big producer of Chinese herbal medicine. Chinese herbal medicine has been developed and utilized by people since ancient times. The demand for Chinese herbal medicine in modern society is also increasing. However, a large amount of Chinese medicine dregs will remain after the production and extraction of herbal medicine. Improper treatment of Chinese herbal medicine dregs will affect the environment It causes pollution. At present, people use it to add feed, fertilizer, etc., and it has produced good results. It can be used for the production of casting medium sand, but it is very rare.