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Water glass used sand regeneration method

A water glass and old sand technology, applied in the field of metal sand casting, can solve the problems of large water consumption, inability to be removed by water washing, large errors, etc., and achieve the effect of improving the removal effect and improving the utilization rate of resources.

Active Publication Date: 2019-08-16
南阳仁创砂业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical regeneration has the following disadvantages: due to the fluctuation of residual substances in the waste sand, the amount of lye added cannot be well controlled, the process is rough, and the error is large; and due to the use of lye, it will cause Na on the surface of the regenerated sand. 2 O The inert film accumulates thicker and thicker, greatly reducing the use effect of recycled water glass sand
The disadvantage of this method is: Na 2 The O removal rate can only reach about 30-50%, and there is still a large amount of Na on the surface of the sand grains. 2 O Inert film residue, can only be used as back sand, cannot be used alone
The disadvantages of this method are: washing consumes too much water, and it will cause a more serious problem—sewage treatment; Multi-component powder adjuvants such as these are practically insoluble in water and therefore cannot be removed by washing with water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Take 120kg of Inner Mongolia roasted sand, add 2.4kg of commercially available sodium silicate glass with a modulus of 3.0, add 1.0kg of commercially available additives (composed of hardener, crosslinking agent, rheological agent and disintegrating agent), and mix in sand The water glass sand is mixed in the machine; the core is made of a certain type of water glass core making machine, the mold temperature is set at 150°C, the sand injection pressure is 5MPa, the air blowing temperature is 200°C, and the air blowing time is 50s; the aluminum liquid pouring temperature is 720°C, and the casting After solidification, shake out the sand and clean it to obtain the old water glass sand for future use.

[0059] (2) The above-mentioned water ratio old sand obtained above is successively crushed by drum vibration and passed through a 20-mesh screen, and the old sand after the screening is sent to the air impact equipment for pretreatment, and the air pressure in the pipeli...

Embodiment 2

[0063] (1) Take 120kg of Inner Mongolia roasted sand, add 2.4kg of commercially available sodium silicate glass with a modulus of 3.0, add 1.0kg of commercially available additives (composed of hardener, crosslinking agent, rheological agent and disintegrating agent), and mix in sand The water glass sand is mixed in the machine; the core is made of a certain type of water glass core machine, the mold temperature is set at 180°C, the sand injection pressure is 3MPa, the air blowing temperature is 180°C, and the air blowing time is 120s; the aluminum liquid pouring temperature is 700°C, and the casting After solidification, shake out the sand and clean it to obtain the old water glass sand for future use.

[0064] (2) The above-mentioned water ratio old sand obtained above is successively crushed by drum vibration and passed through a 15-mesh screen, and the old sand after the screening is sent to the air impact equipment for pretreatment, and the air pressure in the pipeline of ...

Embodiment 3

[0068] (1) Take 120kg of Inner Mongolia roasted sand, add 2.4kg of commercially available sodium silicate glass with a modulus of 3.0, add 1.0kg of commercially available additives (composed of hardener, crosslinking agent, rheological agent and disintegrating agent), and mix in sand The water glass sand is mixed in the machine; the core is made of a certain type of water glass core machine, the mold temperature is set at 230°C, the sand injection pressure is 7MPa, the air blowing temperature is 240°C, and the air blowing time is 40s; the aluminum liquid pouring temperature is 750°C, and the casting After solidification, shake out the sand and clean it to obtain the old water glass sand for future use.

[0069] (2) The above-mentioned water ratio old sand obtained above is successively crushed by drum vibration and passed through a 10-mesh screen, and the old sand after the screening is sent to the air impact equipment for pretreatment, and the air pressure in the pipeline of t...

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Abstract

The invention discloses a water glass used sand regeneration method. The water glass used sand regeneration method comprises the steps that pneumatic impact equipment is adopted for pretreatment of the surface of water glass used sand; an addition agent is added in the pretreated water glass used sand, a mixture is obtained, and then the mixture is roasted; and roasted sand particles are subjectedto grinding treatment. The water glass used sand regeneration method combines the advantages of a mechanical method regeneration technology and the advantages of a hot method regeneration technology,the addition agent is added in the hot method process, the removal effect of a Na2O inertia film on the surface of the water glass used sand is greatly improved, and the removal rate of the Na2O inertia film on the surface of the water glass used sand reaches 90% or above; and the obtained regenerated sand can serve as single sand to be used, secondary pollutants cannot be generated, and meanwhile the resource utilization rate is improved.

Description

technical field [0001] The invention relates to the technical field of metal sand casting, in particular to a method for regenerating old water glass sand. Background technique [0002] In the foundry industry, water glass is used as a binder, the most commonly used is sodium water glass, which is mixed with aggregates such as silica sand or special sand to make sand for water glass. Compared with clay sand, water glass sand has the advantages of good fluidity, high strength, and good casting quality; compared with resin sand, water glass sand has the advantages of fast hardening speed, non-toxic and tasteless production process, etc. my country produces millions of tons of waste water glass sand for foundry every year, and most foundry enterprises treat waste water glass sand as solid waste, causing serious environmental pollution. Since the main component of water glass is sodium silicate, after the high temperature of core making and pouring, a layer of Na is formed on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00B22C5/04
CPCB22C5/00B22C5/04
Inventor 包羽冲尹海军冯俊龙张鹏刘承翔
Owner 南阳仁创砂业科技有限公司
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