Method for recycling sand mold casting waste sand

Abstract

The invention relates to the technical field of sand mold casting and in particular to a method for recycling sand mold casting waste sand. The method comprises the specific steps that caked waste sand on a sieve is broken into fine sand; then, the fine sand and an acid solution are mixed sufficiently through spraying; the fine sand mixed sufficiently is ground through a grinding machine; separation is carried out through a centrifugal machine, solids obtained through centrifugal processing are dried until the moisture content is equal to or lower than 0.5-1%; and the dried fine sand is subjected to air screening and magnetic screening to remove impurities in the fine sand, and a finished product is obtained. By means of the method, emission of waste water and waste gas in the production process is reduced, waste sand is recycled, and economic benefits are improved.

Description

technical field [0001] The invention relates to the technical field of sand mold casting, in particular to a method for recycling waste sand of sand mold casting. Background technique [0002] Sand casting is a widely used casting form. Sand casting needs to put the finished part model or wooden model in the sand, and then fill the sand around the pattern. After the pattern is taken out of the box, the sand forms a mold. In order to take out the model before casting metal, the mold should be made in two or more. multiple sections. During the casting process, it is necessary to leave holes and vent holes for casting metal into the mold to form a pouring system. After casting the liquid metal, the mold is kept for a suitable period of time until the metal solidifies. After the part is taken out, the mold is destroyed, so a new mold must be made for each casting. In this way, a lot of sand materials will be wasted in the whole casting process. For the lack of resources in to...

AI Technical Summary

Problems solved by technology

In this way, a lot of sand materials will be wasted in the whole casting process. For the lack of resources in today's era, the waste of sand materials will cause high processing difficulty and increase manufacturing costs for manufacturers. Therefore, it is necessary to save energy in the entire casting process. setting

[0003] At present, some recycling methods are only to sieve the waste sand, and then recycle the under-screen material. The over-screen material is not recycled and discarded, and the over-screen material is generally agglomerated waste sand, which is still valuable. Recycling of the oversize will lead to the problem of insufficient recycling of waste sand and low rate of sand recycling

Most of the waste sand on these sieves has invalid or unexpired binders attached to them, and cannot be directly used for secondary casting castings

At present, the existing waste sand regeneration device on the sieve only removes the coated binder through simple vibration and friction, the removal effect is not good, and the recovery efficiency is low

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