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Reclaiming method for ester-hardened alkaline phenolic resin used sand

A technology of phenolic resin and ester hardening, which is applied in the regeneration field of ester hardened alkaline phenolic resin old sand, which can solve the problems that the surface resin film is difficult to completely remove, and the performance of ester hardened alkaline phenolic resin regenerated sand is difficult to meet the standards.

Active Publication Date: 2017-11-07
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a regeneration method of ester-hardened alkaline phenolic resin old sand to solve the problem of the difficulty in completely removing the surface resin film in the regeneration process of ester-hardened alkaline phenolic resin old sand, resulting in the regeneration of ester-hardened alkaline phenolic resin The performance of recycled sand is difficult to meet the standard

Method used

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  • Reclaiming method for ester-hardened alkaline phenolic resin used sand
  • Reclaiming method for ester-hardened alkaline phenolic resin used sand

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Step S110, selecting hydrochloric acid, citric acid, sodium dihydrogen phosphate and water as the raw materials of the composite release agent, and mixing water, inorganic acid, organic acid and inorganic salt in a mass ratio of 1:0.1:0.05:0.02 in terms of pure substances A composite release agent is obtained. Mix the ester-hardened alkaline phenolic resin old sand with the composite release agent (accounting for 1% of the mass of the ester-hardened alkaline phenolic resin old sand), add it into the drum heater and heat it at 450°C for 30-40 minutes to carry out the chemical reaction , until the pH of the material is neutral or weakly acidic. Regenerated sand after reaction is obtained.

[0025] Step S120, heating the reacted regenerated sand at 750° C. for 30 minutes, then discharging, cooling and sieving to obtain ester-hardened alkaline phenolic resin regenerated sand.

Embodiment 2

[0027] Step S210, select hydrochloric acid, citric acid, sodium dihydrogen phosphate, aluminum stearate and water as composite release agent raw materials, and the quality of water, inorganic acid, organic acid, inorganic salt and stearate in terms of pure substances The ratio is 1:0.1:0.05:0.02:0.02 and mixed to obtain a composite release agent. Mix the ester-hardened alkaline phenolic resin old sand with the composite release agent (accounting for 1% of the mass of the ester-hardened alkaline phenolic resin old sand) evenly, add it to the drum heater and heat it at 450°C for 30-40 minutes to carry out chemical React until the pH of the material is neutral or weakly acidic. Regenerated sand after reaction is obtained.

[0028] Step S220, heating the reacted regenerated sand at 750° C. for 30 minutes, then discharging, cooling and sieving to obtain ester-hardened alkaline phenolic resin regenerated sand.

Embodiment 3

[0030] Step S310, select hydrochloric acid, citric acid, sodium dihydrogen phosphate, hydroxyethylidene diphosphonic acid and water as composite release agent raw materials, and water, inorganic acid, organic acid, inorganic salt and hydroxyethylidene diphosphonic acid The mass ratio in terms of substances is 1:0.1:0.05:0.02:0.02 and mixed to obtain a composite release agent. Mix the ester-hardened alkaline phenolic resin old sand with the composite release agent (accounting for 1% of the mass of the ester-hardened alkaline phenolic resin old sand) evenly, add it to the drum heater and heat it at 450°C for 30-40 minutes to carry out chemical React until the pH of the material is neutral or weakly acidic. Regenerated sand after reaction is obtained.

[0031] Step S320, heating the reacted regenerated sand at 750° C. for 30 minutes, then discharging, cooling and sieving to obtain ester-hardened alkaline phenolic resin regenerated sand.

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Abstract

The invention provides a reclaiming method for ester-hardened alkaline phenolic resin used sand. The reclaiming method for the ester-hardened alkaline phenolic resin used sand comprises the steps that the ester-hardened alkaline phenolic resin used sand and a compound film-releasing agent are evenly mixed, and then conduct chemical reaction after being heated at 250-500 DEG C, wherein the compound film-releasing agent comprises inorganic acid, organic acid, inorganic salt and water; and reclaimed sand after reaction is heated at 600-900 DEG C and then subjected to cooling and screening, and ester-hardened alkaline phenolic resin reclaimed sand is obtained. According to the reclaiming method for the ester-hardened alkaline phenolic resin used sand, resin films alkaline oxide adhering to the surface of the ester-hardened alkaline phenolic resin used sand can be removed, a sand grain bonding problem and a potassium and sodium remaining problem are avoided, and it is ensured that the obtained ester-hardened alkaline phenolic resin reclaimed sand has the excellent performance which is the same as or similar to the excellent performance of new sand.

Description

technical field [0001] The invention relates to the field of casting sand core materials, in particular to a method for regenerating used ester-hardened alkaline phenolic resin sand. Background technique [0002] As the country's environmental protection requirements become more and more stringent, many large-scale casting factories have carried out technological transformation and switched to using ester-hardened alkaline phenolic resin sand, furan resin sand or ester-hardened water glass sand to manufacture castings. Among them, ester-hardened alkaline phenolic resin sand has been invented for more than 30 years since the 1980s. It is a water-soluble thermosetting phenolic resin. The resin is strongly alkaline and has high temperature resistance. It is suitable for Production of steel castings, ductile iron castings and aluminum alloy castings. The foundry sand core made of resin sand is used for metal smelting and pouring into metal castings with good stable size and sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00
CPCB22C5/00
Inventor 刘烨马丽刘天宇张吉祥
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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