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Method and device for peeling off attachments on surfaces of waste casting sands

A technology of waste sand and binder, which is applied to the cleaning/processing machinery of casting materials, casting molding equipment, metal processing equipment, etc. The effect of economic and environmental benefits

Inactive Publication Date: 2014-11-26
雷士文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The reality is that the regenerated sand obtained by the existing old sand treatment methods cannot meet the requirements for the use of the inner surface of the mold, the core and other parts, and new sand needs to be used in these parts; or, a part of new sand needs to be added in general before use

Method used

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  • Method and device for peeling off attachments on surfaces of waste casting sands
  • Method and device for peeling off attachments on surfaces of waste casting sands

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Use industrial-grade sodium hydroxide to prepare an aqueous solution with a free alkalinity of 0.1 mol / L, soak the waste sand of alkali phenolic resin, and separate the fallen slag ash with a hydrocyclone, dehydrate the obtained pure sand with a centrifuge, and dry it naturally. According to "Test Methods for Foundry Sand and Mixtures (GB / T 2684)", recycled sand is used to make samples with alkali phenolic resin binder for tensile strength test.

Embodiment 2

[0025] Use industrial-grade potassium hydroxide to prepare an aqueous solution with a free alkalinity of 0.2 mol / L, soak the waste sand of alkali phenolic resin, dehydrate it with a high-frequency vibrating screen, dry the sand with a dryer, and then use wind separation equipment to separate the fallen slag ash . According to "Test Methods for Foundry Sand and Mixtures (GB / T 2684)", recycled sand is used to make samples with alkali phenolic resin binder for tensile strength test.

Embodiment 3

[0027] Use industrial-grade sodium hydroxide to prepare an aqueous solution with a free alkalinity of 0.4 mol / L, soak the waste water glass sand, and separate the fallen slag ash with a hydrocyclone, dehydrate the obtained pure sand with a centrifuge, and dry it naturally. According to "Test Methods for Foundry Sand and Mixtures (GB / T 2684)", recycled sand is used to make samples with modified water glass binder for tensile strength test.

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Abstract

The invention discloses a method and device for peeling off the attachments on the surfaces of waste casting sands. The method is characterized in that sands are soaked in a water solution with a certain alkalinity to remove the attachments from the surfaces of the sands without using a machinery friction method or a high temperature burning method to remove the attachments on the sand surfaces so as to completely recycle the waste casting sands, and during the process no waste is generated. The basic operations of the technology device comprise: soaking to remove the attachments, slag ash separation, dehydration drying, and circulation water filtering.

Description

technical field [0001] The invention discloses a method and an implementation device for peeling off the bonded matter on the surface of the waste sand grains of the casting mold. "Sand grains" as used herein includes quartz sand, chromite sand, ceramic grains and other ore grains. The term "stickers" here includes cured (hardened) resins, dehydrated water glass, inorganic salt minerals and metal oxides. Background technique [0002] There are many types of existing foundry sand regeneration treatment devices, but the methods used can be classified as mechanical friction and heating. The types of mechanical friction include: direct friction, such as patent announcement CN 101868310 B; friction in airflow, such as patent announcement CN 102655964 A; friction in water flow, such as patent announcement CN 102615243 A. The heating type includes: high-temperature heating that burns out organic components, such as patent announcement CN 2859431 Y; heating first and then heatin...

Claims

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Application Information

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IPC IPC(8): B22C5/00
Inventor 雷士文
Owner 雷士文
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