A kind of preparation method of coated sand

Abstract

The invention relates to the casting material technical field, and especially relates to a coated sand preparation method. According to the coated sand preparation method, in the manufacturing process, right amount of liquid phenolic resin is added, the content of added methenamine is reduced, because the main source of flue gas produced during combustion is methenamine combustion, and the liquid phenolic resin is added in the coated sand preparation method, coated sand performance can be ensured, at the same time the amount of the added methenamine is properly reduced, so that in the core making and the casting process of the coated sand, the quantity of generated ammonia, phenol, formaldehyde and nitric oxide and other harmful gases during coated sand combustion can be greatly reduced, the coated sand preparation method is more environmentally-friendly, and the use performance of the coated sand can be promoted.

Description

technical field [0001] The invention relates to the technical field of casting materials, in particular to a method for preparing coated sand. Background technique [0002] In recent years, with the continuous and in-depth development of the green process of the foundry industry, the environmental protection characteristics of the existing foundry auxiliary materials have also been continuously challenged. The main challenge comes from the fact that the coated sand has good low-odor properties under the core-making temperature condition and the generation rate of harmful gases during high-temperature casting, which can improve the working environment of workers in the core-making workshop and casting workshop; secondly, it is required to reduce the amount of gasification of harmful volatiles on the basis of meeting the existing core-making process, so as to reduce the impact on the environment. Based on environmental conditions, a low-smoke coated sand must be developed to r...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the traditional coated sand will release a large amount of harmful gas during the core making and casting process, causing pollution to the environment

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