Foundry waste sand regeneration and reuse method and device

Abstract

A foundry waste sand regeneration and reuse method comprises the following steps: pretreatment of waste sand: the original waste sand is removed with waste garbage through a closed grid unloader, removed with waste iron through a suspension type magnetic separator, removed with large-particle waste sand through a linear vibrating screen, and removed with waste scrap ions through a cut-through magnetic separator, and then enters a waste sand storage tank for storage; cleaning of waste sand: the pretreated waste sand is conveyed to a cleaning area through a sand pump, is introduced to the sand-water separator to remove part of water, then enters a scrubbing-cleaning combined tank for scrubbing and cleaning, enters a buffering concentration tank for sedimentation and concentration, and finally enters a dewatering screen to get rid of part of the water; drying: after the above processing, the waste sand is subjected to low-temperature drying or high-temperature roasting to obtain reclaimed sand, then the reclaimed sand is put into a regeneration sand tank for storage; lamination of regenerated sand: the measured regenerated sand is heated to a certain temperature through a heater, and is put into a precoated sand blender together with adhesive to mix evenly, then the mixture is cooled to room temperature to obtain the precoated sand, and the precoated sand is put into a bucket for storing finished sand.

Description

technical field [0001] The invention relates to a recycling method for foundry waste sand, which is a method for regenerating and reusing waste sand produced in the foundry industry. The invention also discloses equipment for recycling waste sand. Background technique [0002] Since 2000, the average growth rate of my country's foundry industry has been above 10%, becoming the world's largest producer of castings. In 2011, my country's casting production has exceeded 40 million tons, ranking first in the world. Sand casting is the basic process in foundry production. About 90% of the castings in the foundry industry are produced by sand casting. To manufacture one ton of qualified castings, about one ton of sand mold is needed. The basic raw materials for making sand molds are foundry sand and sand binder, and the most commonly used foundry sand is siliceous sand. my country's foundry industry needs more than 40 million tons of siliceous sand every year. A large amount o...

AI Technical Summary

Problems solved by technology

[0006] The currently disclosed waste sand regeneration methods and equipment simply use mechanical regeneration methods, and the obtained reclaimed sand has high impurity content and large expansion coefficient, so it can only be used to produce castings that do not require high dimensional accuracy. , the waste sand must be roasted at a high temperature of 700°C and then combined with mechanical regeneration, and the regeneration cost is very high

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