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Ceramsite sand prepared through used sand regenerated waste and precoated sand prepared through ceramsite sand

A technology of old sand regeneration and ceramsite sand, which is applied in the field of resource recovery, can solve problems such as deformation, large thermal expansion, and casting veins, and achieve low thermal expansion, good high temperature resistance, and zero emissions.

Active Publication Date: 2019-11-08
南阳仁创再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the obtained coated sand has improved temperature resistance and can improve the sand sticking defects of castings, but due to the excessive thermal expansion of silica sand after high temperature, it is easy to cause defects such as veining and deformation of castings.

Method used

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  • Ceramsite sand prepared through used sand regenerated waste and precoated sand prepared through ceramsite sand
  • Ceramsite sand prepared through used sand regenerated waste and precoated sand prepared through ceramsite sand
  • Ceramsite sand prepared through used sand regenerated waste and precoated sand prepared through ceramsite sand

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preparation example Construction

[0042] ﹝Preparation method of ceramsite sand﹞

[0043] The embodiment of the present invention also relates to the preparation method of ceramsite sand, comprising the following steps:

[0044] (1) Separately pulverize the recycled waste ash of the old sand and the aluminum-containing ore and then mix them to obtain a mixed material.

[0045] In one embodiment of the present invention, the particle diameters of the regenerated waste ash of the old sand and the aluminum-containing ore after crushing are both 800-1000 mesh. If the particle size of the raw material is too small, the nucleation and forming speed of the ceramsite will be slow, which will affect the production efficiency, and it will easily stick to the inner wall of the sand mixer; The coated sand has low strength.

[0046] (2) Add 10-15 parts of water glass old sand wet-process regenerated sewage into the mixed material, stir and mix to obtain nuclei.

[0047] In one embodiment of the present invention, stirrin...

Embodiment 1

[0071] A preparation method of high temperature resistant coated sand, comprising the following steps:

[0072] (1) Mixture nucleation:

[0073] 40 parts of the main component is 75% SiO 2 , 15%Al 2 o 3 , 5% Fe 2 o 3 , 3% MgO, 2% CaO regenerated waste ash of old sand was added to a ball mill and ground for 1 hour to make the particle size 800 mesh, and then put it into an inclined sand mixer.

[0074] Continue to put 60 parts of mullite into the inclined sand mixer, add 10 parts of water glass old sand wet-process regenerated sewage, and the conductivity of the sewage is 6000 μs / cm. The stirring speed of the sand mixer is 900r / min, the stirring time is 3min, and the inclination angle of the sand mixer is 30° to obtain a mixture.

[0075] (2) Disc granulation: Send the mixture to the disc granulator through the conveyor belt. The rotating speed of the disc granulator is 40r / min, and the inclination angle is 45°. During the granulation process, 20 parts of water glass old...

Embodiment 5

[0103] In Example 5, bauxite is used to replace mullite. Because the content of impurities in the ceramsite sand produced by bauxite increases, compared with Examples 1 to 3, the strength of the coated sand decreases, and the high temperature resistance time is shortened. Increased expansion.

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Abstract

The invention provides ceramsite sand prepared through used sand regenerated waste. The sand is obtained through preparing of used sand regenerated secondary waste, and the raw material comprises waste ash and sewage, the waste ash is generated through an overheating method or mechanical method of resin sand, clay sand and the like, and the sewage is generated through wet method regeneration of sodium silicate-bonded sand. The invention further provides high-temperature-resisting precoated sand prepared through the ceramsite sand, the high-temperature-resisting property is good, and the heat expansion amount is low. The problem of secondary pollution formed through regeneration of current used sand can be solved, and zero emissions can be achieved.

Description

technical field [0001] The invention relates to the technical field of resource recovery, in particular to ceramsite sand prepared from recycled waste of old sand, and high-temperature-resistant coated sand prepared from the ceramsite sand. Background technique [0002] Foundry old sand regeneration refers to manual treatment to make the used old sand obtain the performance similar to new sand, so that the old sand can be recycled repeatedly, avoiding the pollution of the old sand discharge to the environment, and at the same time reducing the production cost of foundry. However, secondary waste will be generated during the regeneration of old sand, such as: resin sand and clay sand are generally regenerated by thermal and mechanical methods, and a large amount of waste ash will be generated during roasting or grinding, which is collected by the dust removal system every year. It is difficult to handle hundreds of thousands of tons. Because the sodium silicate remaining on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/22
CPCB22C1/00B22C1/22
Inventor 包羽冲尹海军冯俊龙李卓情刘栋
Owner 南阳仁创再生资源有限公司