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Regenerated resin sand for sand mold and preparation process thereof

A technology for regenerating resin and sand molds, applied in casting molding equipment, molds, cores, etc., can solve the problems of increasing environmental protection costs and pressures, a large amount of acid-base waste water, etc., to improve the penetration resistance of molten metal and improve the compactness. , the effect of good plastic performance

Inactive Publication Date: 2019-09-20
启东宇杰雕塑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual treatment process, a large amount of acid-base wastewater will be generated, which will increase the cost and pressure of environmental protection. Therefore, there is still room for improvement.

Method used

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  • Regenerated resin sand for sand mold and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1～3

[0043] Raw material ratio of table 1 mixed resin

[0044]

Embodiment 1

[0046] Embodiment 1: a kind of preparation technology of regenerated resin sand for sand mold, comprises the following steps:

[0047] S301. Old sand crushing: add the used waste sand to the jaw crusher for coarse crushing, and the coarsely crushed old sand is crushed by the roller machine;

[0048] S302, magnetic separation treatment: add the secondary pulverized old sand obtained in step S301 into a magnetic separator with a magnetic field strength of 0.8T, and separate the metal residues in the old sand after magnetic separation;

[0049]S303. Roasting and purification: put the old sand in step S302 into a roasting furnace for roasting, first set the furnace temperature to 250°C, and roast for 2 hours, then set the furnace temperature to 700°C, and continue roasting for 1 hour;

[0050] S304, crushing and sieving: cooling the roasted sand to below 60°C, and then crushing and sieving to obtain a regenerated sand preparation;

[0051] S305. Washing and drying: rinse the recl...

Embodiment 2

[0055] Embodiment 2: a kind of preparation technology of regenerated resin sand for sand mold, comprises the following steps:

[0056] S301. Old sand crushing: add the used waste sand to the jaw crusher for coarse crushing, and the coarsely crushed old sand is crushed by the roller machine;

[0057] S302, magnetic separation treatment: add the secondary pulverized old sand obtained in step S301 into a magnetic separator with a magnetic field strength of 0.8T, and separate the metal residues in the old sand after magnetic separation treatment;

[0058] S303. Roasting and purification: put the old sand in step S302 into a roasting furnace for roasting, first set the furnace temperature to 300°C, roast for 2.5 hours, then set the furnace temperature to 750°C, and continue roasting for 1.5 hours;

[0059] S304, crushing and sieving: cooling the roasted sand to below 60°C, and then crushing and sieving to obtain a regenerated sand preparation;

[0060] S305. Washing and drying: ri...

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Abstract

The invention discloses regenerated resin sand for a sand mold and a preparation process thereof. The regenerated resin sand comprises, by weight, 100-120 parts of raw sand, 80-100 parts of reclaimed sand, 3-6 parts of mixed resin and 0.5-1.5 parts of curing agents. The mixed resin comprises furan resin and phenolic resin with the mass ratio of 3: (0.8-1.5), the furan resin is low-nitrogen furfuryl alcohol resin, and the raw sand comprises round silica sand and polygonal silica sand with the mass ratio of 2:1. The preparation method of the reclaimed sand comprises the following steps of S301, crushing of old sand, S302, magnetic separation treatment, S303, roasting and purification, S304, crushing and sieving, and S305, washing and drying. The preparation process of the regenerated resin sand comprises the following steps of S601, preparing materials, S602, feeding and mixing, and S603 discharging sand. The regenerated resin sand is stable in process and capable of effectively recycling the old sand; and the sand mold prepared from the recycled resin sand has the advantages of being high in stability and capable of effectively inhibiting the occurrence of gas pores, sand holes and cracks.

Description

technical field [0001] The invention relates to the technical field of sand mold materials, in particular to recycled resin sand for sand molds and a preparation process thereof. Background technique [0002] The mold is called the "mother of industry". It is widely used in industrial production and processing. It is a tool for making shaped objects. It mainly realizes the processing of the shape of the object through the change of the physical state of the formed material. According to the different materials of the mold itself , Molds can be divided into: sand molds, metal molds, vacuum molds, paraffin molds, etc. [0003] 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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/22B22C5/00
CPCB22C1/00B22C1/2233B22C5/00
Inventor 黄志杰
Owner 启东宇杰雕塑有限公司
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