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Precoated sand and burn-free regeneration technology thereof

A technology of coated sand and silica sand, applied in the field of materials, can solve the problems of large cooling temperature difference, large energy consumption and high heating temperature, and achieve the effects of improving quality, saving cost and improving melting point.

Active Publication Date: 2015-02-04
LINYI ZHUBAO WATER METER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can solve the regeneration problem of coated sand, but there are also some defects, such as excessive energy consumption (high heating temperature and large cooling temperature difference), low productivity (only 2-3t / h), etc. How to better realize the regeneration of coated sand, to solve the above problems has become the key

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of coated sand, it is prepared by the raw material of following weight part:

[0028] 1000 parts of silica sand, 10 parts of pyrite powder, 5 parts of phenolic resin, 2 parts of bisphenol A epoxy resin, 1 part of phenolsulfonic acid, 1 part of glycine-alanine-glycine tripeptide, 1 part of boric acid, disulfide 1 part of molybdenum, 2 parts of urotropine solution, 1 part of zinc stearate, 1 part of dolomite powder, 1 part of talc powder, and 1 part of graphite powder.

[0029] SiO of the silica sand 2 The content is above 95%, and the particle size is 100 mesh;

[0030] The particle size of the pyrite powder is 100 mesh, and the preparation method is as follows: crush the pyrite ore through an ore crusher, keep the particle size of the ore particles below 1 cm, then send it to a ball mill, and grind it until the particle size is 100 mesh. iron ore powder;

[0031] Described urotropine solution is made of urotropine (C 6 h 12 N 4 ) mixed with water in a weigh...

Embodiment 2

[0039] The old sand of the coated sand prepared in Example 1 is recovered through the following process: collect the old sand of the above-mentioned coated sand and place it in the sand box, and use the waste heat generated by the casting after casting to make the temperature of the sand box reach above 700 ° C, and the duration is 2 10min, the old sand is stripped. The indicators of the old sand after the film removal treatment are: the loss on ignition is less than 0.1%, the water content is less than 0.2%, and the pH is less than 8, which meets the standards.

Embodiment 3

[0041] The performance control test of the coated sand prepared by the present invention:

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PUM

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Abstract

The invention belongs to the field of new materials and discloses precoated sand. The precoated sand is prepared from silica sand, pyrite powder, phenolic resin, bisphenol-A epoxy resin, phenolsulfonic acid, short peptide, boric acid, molybdenum disulfide, a methenamine solution, zinc stearate, dolomite powder, talcum powder and graphite powder. The invention also discloses a burn-free regeneration technology of the used precoated sand. The precoated sand prepared by the technoloyg has relatively high hot tensile strength, low gas-forming property and stable storage property; and the rejection rate of castings is relatively low.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a coated sand and a burning-free regeneration process thereof. Background technique [0002] Coated sand is the abbreviation of resin coated sand (Resin Coated Sand). It is a new type of modeling material invented along with the shell molding method. It was invented by Mr. Croning of Germany during World War II. After the war, it was announced to the world as spoils of war. It has been popularized and promoted abroad in the 1950s. With the development of foreign machinery industry, especially the automobile industry, the quality requirements of castings are getting higher and higher, such as the improvement of casting surface and dimensional accuracy, the increase of thin-walled castings, and the reduction of internal defects of castings. Membrane sand technology has been steadily developed abroad. In my country, the technology of coated sand started relatively la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/00B22C1/14B22C1/02B22C5/00B22C1/22
Inventor 张太文王庆存姜宝平
Owner LINYI ZHUBAO WATER METER
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