Regeneration technology of foundry used sand

A process and technology of used sand, applied in the field of regeneration process of used foundry sand, can solve the problems of affecting magnetic absorption, reducing the strength of sand core, large acid consumption value, etc. The effect of pollution

Active Publication Date: 2015-08-26
南阳仁创再生资源有限公司
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  • Application Information

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Problems solved by technology

[0002] In the existing foundry sand regeneration process, magnetic separation is usually performed before roasting to remove magnetic substances, but the residual organic matter contained in the old foundry sand affects the magnetism, making it difficult to completely remove the magnetic substances
At the same time, the inventors of the present application have found in research that during the follow-up high-temperature heat treatment process, a layer of iron film is often adhered to the surface of the sand grains, and there are small iron beads in the tiny por

Method used

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  • Regeneration technology of foundry used sand
  • Regeneration technology of foundry used sand
  • Regeneration technology of foundry used sand

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Experimental program
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Effect test

Embodiment 1

[0031] A regeneration process for foundry old sand, comprising the steps of:

[0032] 1) Carrying out the primary magnetic separation of the broken old sand to remove the coarse magnetic substance mixed in the old sand; the magnetic induction of the magnetic separation is 3000 gauss;

[0033] 2) roasting the old sand after the initial magnetic separation; the roasting process conditions: the temperature is 700°C, and the roasting time is 5.5 hours;

[0034] 3) Cool the calcined sand particles to 130°C with water mist, continue ventilating and blasting at the bottom of the grinder, and at the same time continuously pump air at the top of the grinder, so that an airflow is formed in the grinder to make the sand particles boil, and the pressure is controlled at - 4.5KPa, to remove impurities such as dead ash produced when the surface of the sand is roasted;

[0035] 4) Sieve the ground sand through 20 meshes and then magnetically separate again; the magnetic induction intensity ...

Embodiment 2

[0037] Adopt the method for embodiment 1 to prepare reclaimed sand, difference is:

[0038] 1) The roasting temperature in step 2) is 500°C, and the roasting time is 5 hours;

[0039] 2) Mechanical grinding process conditions in step 3): negative pressure of -4KPa is formed in the grinding machine;

[0040] 3) The magnetic induction intensity of magnetic separation in step 4) is 10000 Gauss, and the amount of sand feeding is 5T / h,

[0041] The sand thickness is 3mm.

Embodiment 3

[0043] Adopt the method for embodiment 1 to prepare reclaimed sand, difference is:

[0044] 1) The roasting temperature in step 2) is 800°C, and the roasting time is 6 hours;

[0045] 2) Mechanical grinding process conditions in step 3): -5KPa negative pressure is formed in the grinding machine;

[0046] 3) The magnetic induction intensity of magnetic separation in step 4) is 13000 gauss, and the amount of sand feeding is 2T / h,

[0047] The sand thickness is 1mm.

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Abstract

The invention relates to a regeneration technology of foundry used sand. The technology comprises the following steps that (1), initial magnetic separation is carried out on broken used sand; (2) the broken used sand obtained after initial magnetic separation is roasted; (3), roasted sand grains are cooled, and under the negative pressure condition, blast grinding is carried out on the sand grains; and (4), the ground sand grains are screened, magnetic separation is carried out again, and regeneration sand is obtained. The quality of the regenerated sand obtained through the technology treatment is further improved, the acid consumption value and the ignition losses of the sand are obviously reduced, the sand grain and the resin coating effect is better, the strength is higher, the pollution of the used sand to the environment is reduced, the cost of core making materials of a casting enterprise is saved, and a hot core box and a cold core box made of original sand can be completely replaced.

Description

technical field [0001] The invention relates to a regeneration process of used casting sand, which belongs to the technical field of recycling foundry used sand. Background technique [0002] In the existing foundry sand regeneration process, magnetic separation is usually performed before roasting to remove magnetic substances. However, the residual organic matter contained in the old foundry sand affects the magnetism, making it difficult to completely remove the magnetic substances. At the same time, the inventors of the present application have found in research that during the follow-up high-temperature heat treatment process, a layer of iron film is often adhered to the surface of the sand grains, and there are small iron beads in the tiny pores inside the sand core (type); therefore, now The reclaimed sand obtained by the foundry old sand regeneration process is of poor quality, which still contains a large amount of magnetic impurities. However, due to the existence...

Claims

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Application Information

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IPC IPC(8): B22C5/06B22C5/08B22C5/04
Inventor 秦升益秦申二尹海军
Owner 南阳仁创再生资源有限公司
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