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Method for regenerating water-glass old sand

A technology for regenerating old sand and water glass, applied in casting molding equipment, metal processing equipment, manufacturing tools, etc., can solve the problem of deteriorating high temperature performance of water glass type (core) sand, deterioration of high temperature performance of water glass type (collapse and fire resistance) problems such as speed, to achieve great application value, the effect of simple equipment

Inactive Publication Date: 2006-06-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "chemical regeneration" process method is to add NaOH and water to ordinary water glass to reduce the modulus and concentration of water glass, and use lower modulus and low concentration of water glass to regenerate old water glass sand or dry method Reuse of sand to obtain higher rebonding strength and longer usable time than ordinary water glass; but this method increases Na in the water glass sand system 2 The accumulation of O content deteriorates the high temperature performance (collapse and refractoriness) of water glass type (core) sand
"Recycling method of water glass sand" is to improve the reuse performance of water glass old sand by adding additives (maltose, trisodium phosphate, calcium carbonate, etc.) in the water glass old sand, but still does not solve the problem During recycling, Na 2 The accumulation of O will still deteriorate the high temperature performance of water glass type (core) sand

Method used

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  • Method for regenerating water-glass old sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Break the old water glass sand into sand grains, add water to the old sand to make the water content of the wet old sand 0.5%, use the natural air-conditioning outdoors in winter, introduce the old sand and air-conditioning into the mixing chamber and freeze it to a temperature of -1°C , and then perform mechanical centrifugal dry regeneration on the frozen and cooled water glass old sand, and exhaust and dust removal during the regeneration process to remove the residual components on the surface of the water glass old sand, and obtain regenerated water glass sand after humidity adjustment and temperature adjustment, ready for use .

Embodiment 2

[0022] Break the old water glass sand into sand grains, add water to the old sand to make the water content of the wet old sand 10.0%, use a scroll refrigeration compressor to refrigerate, and introduce the old sand and cold air into the mixing chamber to freeze and cool to the temperature - 60 ℃, and then carry out airflow impact dry regeneration on the frozen water glass old sand, and exhaust dust during the regeneration process to remove the residual components on the surface of the water glass old sand, and obtain the regenerated water glass sand after humidity adjustment and temperature adjustment. stand-by.

Embodiment 3

[0024] Crush the old water glass sand into sand grains, add water to the old sand grains to make the water content of the wet old sand 5%, use a screw refrigeration compressor to refrigerate, introduce the old sand and cold air into the mixing chamber to freeze and cool to -35°C , and then perform mechanical centrifugal dry regeneration on the frozen and cooled water glass old sand, and exhaust and dust removal during the regeneration process to remove the residual components on the surface of the water glass old sand, and obtain regenerated water glass sand after humidity adjustment and temperature adjustment, ready for use .

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Abstract

A process for regenerating the used water glass sand used for metallic casting includes such steps as breaking, adding water, freezing at -1¿D-60 deg.C, dry regeneration while dusting and de-moistening.

Description

technical field [0001] The invention belongs to a recycling method for metal casting materials, and in particular relates to a recycling method for used water glass sand. technical background [0002] The water glass sand casting process has many advantages such as high strength, low cost, simple process, and environmental friendliness. Since it was introduced into the foundry industry in the 1960s, it has been widely used in countries all over the world. However, it is difficult to regenerate the old water glass sand. , has plagued foundry workers for decades, and is considered to be one of the worldwide problems in the foundry industry. In many casting factories or workshops in our country, the discarded old water glass sand is still piled up like a mountain, which has brought serious pollution to the environment and is also a great waste of resources. A large amount of waste water glass old sand not only increases the transportation cost, wastes limited resources, but al...

Claims

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Application Information

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IPC IPC(8): B22C5/00
Inventor 樊自田董选普黄乃瑜王继娜张黎刘军周宏宇
Owner HUAZHONG UNIV OF SCI & TECH
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