A kind of casting glass sand and preparation method thereof

Abstract

The invention provides a casting glass sand, which comprises water and: 60-88 parts by weight of casting sand; 6-30 parts by weight of bentonite; and 0.1-0.9 parts by weight of borax. The present invention adopts borax as an anti-adhesive additive and cosolvent, and prepares glass sand together with bentonite and sand; the glass sand provided by the present invention is a glass body, which melts at high temperature, fills the gap between molding sands, and reduces the infiltration angle. Prevent the molten iron from infiltrating the molding sand, and achieve the effect of good sand removal performance. The glass sand provided by the invention has less solid waste discharge. It can be reused many times and does not need to be discarded. Glass sand is all inorganic and friendly to the environment. During casting and pouring, no gas is produced and the environment is not polluted. In foundry sand, there is no effect of deteriorating molding sand.

Description

Technical field[0001]The present invention relates to the field of casting industrial technologies, and more particularly to a cast glass sand and a preparation method thereof.Background technique[0002]In the existing casting industry, sand is the material used in casting. Sand is typically mixed by molding materials such as sand, molded sandbase and adjuvant, and naturally clay silicone sand can also be used. Sands have an extremely important role in casting production, and the casting waste rate caused by the quality instability of the sand will increase. Usually, the performance indicators of shaped sand are: gas permeability, strength, retreat, collapse, fluidity, and the like.[0003]In order to improve the surface quality of the castings, the casting defect is reduced, and the auxiliary is often added in the molding process. During the casting process, after the molten metal fluid is cast into the mold, the organic matter in the auxiliary is incompletely combustion and coking re...

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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