Sodium silicate reclaimed sand and preparation method and application of reclaimed sand

Abstract

The invention relates to sodium silicate reclaimed sand and a preparation method and application of the reclaimed sand. The method comprises the steps that firstly, old sand of sodium silicate is smashed into single-particle sand, an active agent is added, the activity of the old sand of the sodium silicate is restored, and the old sand of the sodium silicate acquires reusing performance; a sodiumsilicate binder and a curing promoter are added, sand mixing is carried out, and the obtained reclaimed sand can be used for casting production. According to the method, the old sand is regenerated,the production process is simplified, and the production cost is reduced; the reversible characteristic of the sodium silicate binder is utilized, the active agent is added to restore the activity ofthe old sand, and therefore the same binding effect can be achieved through the small adding amount of the sodium silicate binder, and the raw material cost is reduced; and glass fibers are added intothe curing promoter, the high tensile strength characteristic is utilized, the strength of a sand core can be effectively improved, and the technical requirement of casting production is met.

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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