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Resin old sand recovering and utilizing method

A technology of used sand and resin, applied in the field of recycling used resin sand, can solve the problems of high energy consumption and high cost

Inactive Publication Date: 2009-06-17
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Removal of combustible residues in old sand, the effect of this treatment is good, but the energy consumption is high and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] After measurement, the gas generation of coal powder is 274ml / g, and the average gas generation of resin old sand is 8.7ml / g. The old clay content of the wet clay sand is 11.79ml / g, the effective clay content is 7.3%, and the coal powder content is 1.8%. The coal powder content in the molding sand required in production is 2.0%. Calculating that the addition of resin old sand is 10%, the reduction of coal powder in every kilogram of wet clay sand used sand is: ΔWcp=0.1×8.7 / 274=3.2×10 -3 g. Add the raw sand and the used resin sand in the same proportion to the same wet clay sand and mix them with a roller sand mixer. The performance of the two molding sands is determined to be similar, as shown in Table 1:

[0015] Table 1

[0016] Numbering

Embodiment 2

[0018] After measurement, the gas generation of coal powder is 274ml / g, and the average gas generation of resin old sand is 8.7ml / g. The old clay content of the wet clay sand is 11.79ml / g, the effective clay content is 7.3%, and the coal powder content is 1.8%. The coal powder content in the molding sand required in production is 2.0%. According to the amount of resin old sand added as 50%, the reduction of coal powder added in every kilogram of wet clay sand used sand is: ΔWcp=0.5×8.7 / 274=1.59×10 -2 g. Add the raw sand and the used resin sand in the same proportion to the same wet clay sand and mix them with a roller sand mixer. The performance of the two molding sands is determined to be similar, as shown in Table 2:

[0019] Table 2

[0020] Numbering

[0021] It can be seen that adding the old resin sand recycled by the present invention to the green clay sand does not affect the use effect of the molding sand compared with the raw sand (new sand) added to th...

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Abstract

The present invention discloses a method for recycling a resin old sand, which is characterized in that: firstly the resin old sand is broken and screened, and is added into wet clay sand as new supplemental sand; under the precondition of ensuring the lowest coal powder content in the wet clay sand is no less than 0.3%, the addition quantity of the coal powder needing to be reduced is calculated according to the addition quantity of the resin old sand; the corresponding fomula is as follows: DeltaWcp is equal to WrsrxGrs / Gcp; wherein DeltaWcp is the addition quantity of the coal powder reduced; the unit is ml / g, Gcp is the gas content of the coal powder, unit is ml / g. Compared with adding the original sand into the wet type clay sand, the application effect of the molding sand in the invention which adopts the method of adding the resin old sand recycled into the wet type clay sand is not affected, the aim of recycling resin old sand is achieved. The invention has the advantages of excellent treating effect, low energy consumption and low costs.

Description

technical field [0001] The invention relates to a method for recycling molding sand in foundry production, and more specifically relates to a method for recycling used resin sand. Background technique [0002] A large amount of molding sand is required in foundry production. According to statistics, about 5 to 10 tons of green sand are needed to produce 1 ton of castings. When preparing molding sand, old sand should be reused as much as possible, that is, reusable molding sand. This is not only an economic need, but also a need to protect the environment and prevent pollution. In the process of recycling the old wet clay sand, in addition to a series of treatments for the old sand, new sand, bentonite, coal powder and water must be added to the old sand to improve the performance of the mixed molding sand. It meets the requirements, and the addition amount of new sand is usually 10% to 50%, which is used to dilute the old sand and avoid excessive oolitics in the old sand. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C5/00
Inventor 潘嘉祺孙亚琴陈麒忠乔佳木
Owner SHANGHAI INST OF TECH
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