Cast glass sand and preparation method thereof

Abstract

The invention provides cast glass sand. The cast glass sand comprises water as well as, by weight, 60-88 parts of casting sand, 6-30 parts of bentonite and 0.1-0.9 part of borax. The glass sand is prepared from the borax, bentonite and sand, and the borax is used as an anti-sticking additive and cosolvent. The glass sand provided by the invention is a glass body, is molten under high temperature,is used for filling a gap between mold sand, reducing the infiltration angle and preventing molten iron from infiltrating into the mold sand, and achieves the effect of good sand discharging performance. The glass sand has little solid waste emission, can be repeatedly used instead of being abandoned, and is friendly to the environment as being wholly inorganic matter. No gas is generated during casting and pouring, so that no pollution is caused to the environment. The mold sand is prevented from being degraded when cast.

Description

technical field [0001] The invention relates to the technical field of foundry industry, in particular to a casting glass sand and a preparation method thereof. Background technique [0002] In the existing foundry industry, molding sand is a material used for modeling in foundry. Molding sand is generally made by mixing molding materials such as foundry sand, molding sand binder and auxiliary additives in a certain proportion, and natural silica sand containing clay can also be used. Molding sand plays an extremely important role in foundry production, and the casting reject rate will increase due to unstable quality of molding sand. Usually, the performance index requirements for molding sand include: air permeability, strength, yield, collapse, fluidity, etc. [0003] In order to improve the surface quality of castings and reduce casting defects, additives are often added to the molding sand during the casting process. In the casting process, after the molten metal is ...

AI Technical Summary

Problems solved by technology

It has the advantages of low material cost, good anti-sticking sand effect and high production efficiency, but its consumption is large, the emission is serious, and coal powder is burned and decomposed during the casting process to produce toxic gases and carcinogens, which pollute the environment and affect the health of workers. healthy

According to statistics, the use of coal powder clay sand to produce castings requires about 0.8t to 1t of molding sand per ton of castings. A large amount of old sand is discarded every year in the country, and tens of millions of tons of new sand are consumed at the same time, especially the coal used for casting iron castings. Powder clay old sand brings serious black pollution to the environment, does not meet the needs of the scientific development of the foundry industry, does not meet the current environmental protection policy of reducing consumption and emission reduction and the requirements of the national ecological civilization construction. It has a negative impact on the health of foundry workers and the surrounding environment. adverse effects

[0004] Therefore, the current coal powder sand mainly has the following disadvantages: during the casting process, the temperature of the molten iron is about 1400, and after contacting the coal powder, it is partially burned and oxidized, and the coal powder burns and decomposes to produce nitrogen oxides, and carbon oxides pollute the environment

After repeated use of pulverized coal, the particle size distribution of the molding sand deteriorates, resulting in deterioration of casting quality

Coal powder leads to low strength of mixed molding sand

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