Reclaiming treatment method for furan resin self-hardening sand

Abstract

The invention relates to a reclaiming treatment method for furan resin self-hardening sand, which comprises the following steps: (1) pretreatment; (2) treating sand pretreated in Step (1) with a silica sand scrubbing machine, drying and crushing sand subjected to scrubbing treatment, sieving the sand subjected to scrubbing treatment with a 40-mesh sieve, and performing magnetic separation treatment with a magnetic separator to obtain sand subjected to secondary treatment, wherein the feeding concentration is 35% during scrubbing treatment, and the magnetic field intensity is 0.75 T during magnetic separation; (3) mixing and stirring the sand subjected to secondary treatment with a mixed solution at the weight ratio of 1:3.3, removing suspended solids, and performing filtration to obtain sand subjected to tertiary treatment; and (4) washing the sand subjected to tertiary treatment in Step (3) with water, and drying the washed sand to obtain reclaimed sand. According to the method, the yield of the reclaimed sand obtained through treatment of the steps is remarkably increased as compared with the yield of reclaimed sand obtained through a conventional treatment method; and a sand mould prepared from the reclaimed sand has high stability and can effectively prevent air holes, sand holes, cracks and the like so as to increase the yield of castings.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a regeneration 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 regeneration treatment method for furan resin no-bake sand, which can increase the removal rate of furan resin in old sand and improve the effect of regeneration. [0004] The present invention is realized through the following technical solution...

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