Regeneration process of resin sand for casting

Abstract

The invention relates to a resin sand regeneration process for foundry, which mainly solves the problem of poor quality of regenerated sand in the prior art, and comprises the following steps: crushing the molding sand; flattening the crushed old sand in granular form on a conveying device Transport the magnetic field with a magnetic field strength of 1.0T to 1.2T on the conveyor belt; put the old sand treated in step 2 into a solution with a pH value of 4.3 to 5.2 and soak it in an ultrasonic treatment; Put the sand into a roasting furnace with a temperature of 820°C to 870°C for 3 to 4 hours; gradually lower the temperature of the roasting furnace to 230°C to 250°C, take out the old sand and soak it in the cooling liquid for rapid cooling, and then put it Put it into the potassium compound solution; take out the old sand to air dry or dry it, put it into the wasting machine, the temperature of the inner cavity of the wasting machine is maintained at 610 ° C ~ 620 ° C, and the impurities attached to the old sand are separated from the old sand through the waste machine ; The sand processed in step 6 is washed, filtered and dried to form regenerated sand.

Description

technical field [0001] The invention relates to a resin sand regeneration process for casting. Background technique [0002] my country is a big country in the foundry industry. Foundry companies use and consume many sand molds every year. Sand molds are generally made by adding adhesive, raw sand, and curing agent to the sand mixer according to a certain ratio, and continuously mixing them through the sand mixer. Molding sand, reusing molding sand for molding or core making. Sand molds will produce a lot of old sand after use. Our country produces more than 50 million tons of used casting sand every year. Many companies directly bury the old sand and discard it. There is a lack of recycling of used sand. [0003] The existing medium-sized molding sand in the foundry industry usually uses resin sand. Resin sand refers to molding sand or core sand that uses artificial resin as the binder of sand grains. , the resin undergoes an irreversible cross-linking reaction and solidif...

AI Technical Summary

Problems solved by technology

[0005] Therefore, in view of the above-mentioned problems, the present invention provides a resin sand regeneration process for foundry, which mainly solves the problem of poor quality of regenerated sand in the prior art

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