Waste foundry sand regeneration method

Abstract

The invention provides a waste foundry sand regeneration method, belongs to the field of environment-friendly regeneration, and particularly relates to a recovery method for waste casting materials. According to the waste foundry sand regeneration method, procedures are successive and reasonable, operation is easy and convenient, and the regeneration rate is high. The waste foundry sand regeneration method comprises the steps of (1) breaking of waste foundry sand, (2) roasting, (3) wet stirring, (4) grinding, and (5) winnowing and magnetic separation. According to the waste foundry sand regeneration method, the heating procedure, the wet stirring procedure and the mechanical grinding procedure are more successive and reasonable, sand reclaimed through the method is high in quality, the regeneration rate is high, and thus, the waste foundry sand regeneration method has good technical feasibility and applicability; and by adoption of the waste foundry sand regeneration method, no poisonous and harmful waste is discharged in the treatment process, zero emission is achieved, and the purpose of environmental protection is achieved.

Description

technical field [0001] The invention belongs to the field of environmental protection and regeneration, and in particular relates to a method for recycling and processing waste casting materials. Background technique [0002] With the continuous upgrading of casting materials, inorganic coated sand began to appear. Due to the good environmental protection performance of inorganic coated sand, the emission of waste smoke and exhaust gas during the use of traditional molding sand is greatly reduced during the use of casting. Inorganic coated sand has been widely used, and the resulting inorganic coated sand Membrane sand waste sand also began to appear in large quantities. At this stage, inorganic coated sand is mixed with ordinary resin sand to form solid waste, but the corresponding recycling methods are rarely mentioned. A joint regeneration process of inorganic coated sand and organic resin sand is to realize the function of recycling and reusing the mixed sand of inorga...

AI Technical Summary

Problems solved by technology

[0004] The existing recycling process faces the following problems: First, the existing inorganic coated sand and organic resin sand waste sand lack effective recycling technology, so the inorganic coated waste sand will become solid waste and cannot be recycled; There are also many problems to be solved in some recycling methods. The dry regeneration effect is poor for one regeneration and multi-stage dry regeneration is required; the wet regeneration equipment is huge and complicated, occupies a large area and consumes high energy consumption; the combined regeneration at this stage The regeneration object basically does not involve the mixed sand of inorganic coated sand and organic resin sand

This will lead to the embarrassing situation that the mixed sand of inorganic coated sand and organic resin sand cannot be recycled, which will bring a huge economic burden to enterprises and bring huge pressure on our country's resources and environment

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