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Manufactured sand for casting and preparation method thereof

A kind of artificial sand and granulation technology, which is applied in the direction of casting molding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of high cost, low recycling rate of old sand, complex process, etc., and achieve long service life and low water absorption , the effect of uniform granulation

Inactive Publication Date: 2020-03-10
GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the process is complicated, the recycling rate of old sand is low, and a large amount of additives need to be added at the same time, and the cost is high.

Method used

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  • Manufactured sand for casting and preparation method thereof
  • Manufactured sand for casting and preparation method thereof
  • Manufactured sand for casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Prepare the mixture:

[0035] 500 parts of foundry old sand, 1000 parts of foundry recycled dust, 150 parts of Ca-based bentonite, 150 parts of high alumina fly ash, 100 parts of metakaolin calcined at 600 °C, 50 parts of alumina powder and 50 parts of coal powder were respectively After ball milling into a powder with a particle size of 150-200 mesh, put it into a ball mill and mix for 30-60 minutes;

[0036] (2) Granulation and maintenance:

[0037] The mixed powder is granulated in a pan granulator with a rotating speed of 35r / min to obtain pellets with a particle size of 0.5mm, and then cured in a thermostat at 120°C for 24 hours;

[0038] (3) Sintering:

[0039] Sintering in a high-temperature furnace or a rotary kiln at 1250° C. for 30 minutes to obtain the foundry artificial sand.

Embodiment 2

[0041] (1) Prepare the mixture:

[0042] After 500 parts of foundry old sand, 1000 parts of foundry recycled dust, 150 parts of Ca-based bentonite, 100 parts of secondary fly ash, 100 parts of alumina powder and 50 parts of coal powder were respectively pulverized into powders with a particle size of 200 mesh, followed by Put it into a ball mill and mix for 30 minutes;

[0043] (2) Granulation and maintenance:

[0044] Granulate the mixed powder in a disc granulator with a rotating speed of 30r / min to obtain pellets with a particle size of 1mm, and then maintain them in a thermostat at 120°C for 24 hours;

[0045] (3) Sintering:

[0046] Sintering in a high-temperature furnace or a rotary kiln at 1300° C. for 30 minutes to obtain the foundry artificial sand.

Embodiment 3

[0048] (1) Prepare the mixture:

[0049] 500 parts of foundry old sand, 1000 parts of foundry recycled dust, 100 parts of Na-based bentonite, 150 parts of secondary fly ash, 100 parts of alumina powder and 50 parts of coal powder were ball-milled into 200-mesh powder, followed by Put it into a ball mill and mix for 30 minutes;

[0050] (2) Granulation and maintenance:

[0051] Granulate the mixed powder in a disc granulator with a rotating speed of 40r / min to obtain pellets with a particle size of 0.5mm, and then maintain them in a thermostat at 120°C for 24 hours;

[0052] (3) Sintering:

[0053] Sintering in a high-temperature furnace at 1400° C. for 30 minutes to obtain the foundry artificial sand.

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Abstract

The invention provides manufactured sand for casting and a preparation method thereof. The manufactured sand for casting is prepared from the following components in parts by mass: 500-1000 parts of used sand of casting, 500-1000 parts of regenerated fly ash of casting, 100-300 parts of bentonite, 0-300 parts of kaolin, 100-300 parts of coal ash, 50-150 parts of aluminum powder and 10-100 parts ofpulverized coal. The manufactured sand for casting has the advantages of low density, low water absorption, good air permeability, high refractoriness and the like. The manufactured sand for castingis prepared from the regenerated fly ash of casting as a raw material by the preparation method, so that the used sand of casting and the fly ash generated by disposing the used sand of casting are regenerated and recycled, and therefore, the service life of the original casting sand is prolonged and environmental pollution to lands and water resources as a lot of original casting sand is stackedis solved. Meanwhile, the adding amount of new sand and other additives is reduced, and the production cost of the manufactured sand for casting is lowered.

Description

technical field [0001] The invention relates to a method for reusing solid waste, in particular to an artificial sand for casting prepared by using solid waste as a raw material and a preparation method thereof. Background technique [0002] The foundry industry is an energy- and resource-intensive industry that consumes a lot of energy and a variety of raw and auxiliary materials. Every 1 ton of castings produced will produce about 1.2 to 1.4 tons of waste sand, and at the same time it will produce a lot of waste such as foundry waste slag, foundry dust removal, etc. Ash and other waste. In the prior art, waste dust and slag are treated by filling and building fillers, and a large amount of foundry waste ash is accumulated, and the recycling rate is extremely low. As time goes by, it will not only occupy a large amount of land, but also pollute the land under the action of rainwater. and rivers and lakes. [0003] The current method of recycling foundry sand is to add som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/02B22C5/00
CPCB22C1/00B22C1/02B22C5/00
Inventor 张宏生窦明岳王光
Owner GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD