Preparation method and application of water glass recycled sand and recycled sand core

Abstract

The invention relates to a preparation method and application of water glass regenerated sand and a regenerated sand core. The method of the invention first breaks the old water glass sand into single particle sand, and then adds an active agent to restore the activity of the water glass old sand, so that the old water glass The sand obtains the reusable performance, adding water glass binder and curing agent to carry out sand mixing, and the obtained regenerated sand can be used in foundry production; the method of the present invention does not regenerate the old sand, simplifies the production process, and saves production costs. The present invention utilizes the reversible characteristics of the water glass binder, adding an active agent to restore the activity of the old sand, so that the same bonding effect can be achieved with a lower amount of water glass binder, and the cost of raw materials is saved. The accelerated curing of the present invention Adding glass fiber to the agent, taking advantage of its high tensile strength, can effectively improve the strength of the sand core and meet the technical requirements of foundry production.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a preparation method and application of water glass regenerated sand and a regenerated sand core. Background technique [0002] Binders are an essential molding material in the foundry industry. Organic resins are exposed to high temperatures during core making and casting to produce pungent odors and toxic fumes, which seriously affect the production environment and the health of workers. Compared with traditional organic binders, water glass binders have the advantages of being non-toxic, smoke-free and other green environmental protection, and are an ideal inorganic binder for foundry. However, water glass sand has always had an unsatisfactory regeneration effect of old sand. Reclaimed sand cores have problems such as short service time, loose sand core surface, and low strength, which cannot meet the requirements of foundry production. Therefore, it restricts its...

AI Technical Summary

Problems solved by technology

Organic resins are exposed to high temperatures during core making and casting to produce pungent odors and toxic fumes, which seriously affect the production environment and the health of workers

Compared with traditional organic binders, water glass binders have the advantages of being non-toxic, smoke-free and other green environmental protection, and are an ideal inorganic binder for casting. However, water glass sand has always had an unsatisfactory regeneration effect of old sand. Reclaimed sand cores have problems such as short service time, loose sand core surface, and low strength, which cannot meet the requirements of foundry production. Therefore, their development and application in the foundry industry is restricted.

[0003] Conventionally, the old water glass sand needs to be regenerated by wet method, thermal method, chemical method and other processes before it can be used for production and use, and the utilization rate is very low and the performance is poor, so it cannot be 100% replaced by new sand for core making

In addition, the regeneration and reuse of conventional sodium silicate old sand requires the use of various regeneration processes to remove the residual binder on the surface of the old sand, but none of them can be completely removed.

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