Treatment method for furan resin self-hardening sand

Abstract

The invention relates to a treatment method for furan resin self-hardening sand. The method includes the following steps that firstly, pretreatment is conducted; secondly, pretreated sand well treated in the first step is treated through a silica sand scrubbing machine, in the scrubbing treatment process, the feeding concentration is 35%, the sand obtained after scrubbing treatment is dried, crushed and screened through a forty-mesh sieve, a magnetic separator is used for magnetic separation treatment, and in the magnetic separation process, the magnetic field intensity is 0.75 T, and secondarily-treated sand is obtained; thirdly, the secondarily-treated sand and a mixed solution are mixed and stirred according to the weight ratio of 1:2.3, suspended solids are removed, filtration is conducted, and thirdly-treated sand is obtained; and fourthly, the thirdly-treated sand obtained in the third step is washed through water and dried, and reclaimed sand is obtained. A sand mold prepared through the obtained reclaimed sand is high in stability, generation of air holes, sand holes, cracks and the like can be effectively prevented, the mixed solution can also be reused after being treated, and the treatment cost is reduced.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a treatment method of furan resin self-setting sand. Background technique [0002] my country is a big foundry country. During casting, about 1.5 tons of old foundry sand is produced for every ton of castings cast. The annual output of used foundry sand in my country reaches more than 50 million tons. Many of them are disposed of by burial. Although some furan resins are naturally Hard sand and old sand are recycled, and the recycling rate of furan resin in it is low, resulting in poor hardening effect or prone to defects when reused. Contents of the invention [0003] The purpose of the present invention is to provide a treatment method for furan resin self-setting sand, which can improve the removal rate of furan resin in old sand and improve the effect of recycling. [0004] The present invention is realized through the following technical solutions: [0005] A processing...

AI Technical Summary

Problems solved by technology

[0002] my country is a big foundry country. During casting, about 1.5 tons of old foundry sand is produced for every ton of castings cast. The annual output of used foundry sand in my country reaches more than 50 million tons. Many of them are disposed of by burial. Although some furan resins are naturally Hard sand and old sand recycling method, and the recycling rate of furan resin in it is low, resulting in poor hardening effect or prone to defects when reused