Coated sand recycling production process

A production process and technology of coated sand, which is applied in the direction of manufacturing tools, metal processing equipment, casting molding equipment, etc., can solve the problems of sand agglomeration, affecting the effect of roasting and coating effect, etc., to avoid sand agglomeration and strengthen the market Value, the effect of saving production costs

Inactive Publication Date: 2018-03-09
QINGDAO TIANDI CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the regeneration of coated sand with ferrous sulfate added, since the ferrous sulfate in the resin melts at high temperature, the sand will agglomerate in the case of direct calcination, which will affect the roasting effect and subsequent film effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] The coated sand recycling production process of the present embodiment comprises the following steps:

[0019] (1) Inject the coated sand into a sand box;

[0020] (2) Preliminarily crush the used sand box to separate the sand box from the casting;

[0021] (3) Collect the waste sand broken in (2) for secondary crushing, and use a 120-mesh screen to screen the waste sand after crushing to separate the coated sand from the remaining metal particles;

[0022] (4) Soak the waste sand in (3) in 10% NaOH solution, stir for 3 hours, filter and dry at 100°C for 2 hours;

[0023] (5) Heat the coated sand dried in (4) to 750°C through a roasting furnace;

[0024] (6) Transfer the high-temperature coated sand to the cooling furnace for cooling, and use a 100-mesh screen to screen the sand;

[0025] (7) Put the coated sand screened out in (6) through the weighing device, and add the coated sand with a fixed weight into the heating furnace and heat it to 110°C;

[0026] (8) Mix...

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PUM

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Abstract

The invention discloses a production process for the recycling of coated sand. The key points of the technical scheme are that the discarded coated sand is crushed, screened multiple times, soaked in NaOH solution, roasted, cooled, heated, mixed and stirred, filtered, and sand injected. The process of recycling and regeneration enables the coated sand to be reciprocated and recycled, and the cost of recycling is very low, which can protect the environment and avoid waste of resources.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a production process for the recycling of coated sand. Background technique [0002] At present, in this field, the thermal regeneration process is usually used to recycle the old sand of the coated sand. In this method, the old sand needs to be heated to above 700°C for roasting, so that the adhesive film on the surface is burned or scorched. Then cool down to a temperature suitable for coating. However, for the regeneration of coated sand with ferrous sulfate added, since the ferrous sulfate in the resin melts at high temperature, the sand will agglomerate in the case of direct calcination, which will affect the roasting effect and follow-up process. coating effect. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art, the object of the present invention is to provide a production process fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00
CPCB22C5/00
Inventor 李玉敏
Owner QINGDAO TIANDI CASTING CO LTD
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