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Production method and application of reclaimed sand used for foundry cold cores

A technology of regenerated sand and cold core, which is applied in the direction of casting molding equipment, cleaning/processing machinery of casting mold materials, mold cores, etc. It can solve the problems of oil leakage, engine body is not dense, reduce risk coefficient, etc., and achieve lower melting point , to avoid the effect of insufficient sand core strength

Active Publication Date: 2021-04-06
襄阳仁创铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inner cavity of the cylinder block and the cylinder head of the truck is complicated, and the sand core is made of special sand coated with a layer of phenolic resin. , The amount of gas released when the resin burns is large. If the gas stays in the casting, the engine body will not be dense, causing fatal problems such as oil leakage.
The resin content of the cold core sand is only about 11% of that of the hot core sand, which greatly reduces the risk factor. However, under the condition of 1411°C, the heat resistance of the cold core sand is poor, which will cause the inner cavity of the casting to deform and reduce the dimensional accuracy.
[0003] Conventional foundry old sand regeneration process, the regenerated sand produced by it, due to the problems of residual resin film, residual binder, high mud content, high pH, ​​etc., when preparing cold cores, not only the strength of the sand core is low, but also the refractoriness is serious Not enough, a large amount of new sand must be mixed
Adding ferrochrome sand, pearl sand, ceramsite sand and other methods to prepare cold cores can make up for the above-mentioned defects of insufficient refractoriness, but it will cause a sharp increase in the production cost of the foundry, and ferrochrome sand is an imported resource, which is restricted by others; Both sand and ceramic sand are high-alumina refractory materials, and their production consumes raw materials such as aluminum ore and bauxite that are restricted by the country, and consumes a lot of energy and is inconvenient to use.

Method used

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  • Production method and application of reclaimed sand used for foundry cold cores
  • Production method and application of reclaimed sand used for foundry cold cores
  • Production method and application of reclaimed sand used for foundry cold cores

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preparation example Construction

[0029] The preparation method of regenerated sand for foundry cold core provided by the invention comprises the following steps:

[0030] (1) Get langbeinite and dissolve it in water to form an active agent solution;

[0031] Preferably, in step (1), the preparation method of the active agent solvent is as follows: take 11-11 g of langbeinite and add it to 111 mL of water at a temperature of 21-11° C., stir and dissolve to obtain the active agent solution. The activator solution adopted in the present invention is an aqueous solution of langbeinite, which is dissolved in water to form a high-concentration or saturated activator solution for the modification of old foundry sand.

[0032] (2) Take old foundry sand, pre-treat it, then add the active agent solution obtained in step (1) at 111-211° C., and stir at high speed to obtain the regenerated sand.

[0033] Preferably, in step (2), the used foundry sand is organic sand or mixed sand. Preferably, the mixed sand includes or...

Embodiment 1

[0039] A kind of regenerated sand for foundry cold core, its preparation method comprises the following steps:

[0040] (1) Take 11 g of langbeinite and add it to 111 mL of water at a temperature of 11° C., stir and dissolve to obtain the active agent solution;

[0041] (2) Take foundry old sand-organic sand for pretreatment, the pretreatment is thermal old sand regeneration treatment method, specifically including crushing old sand, roasting at 311°C, and particle screening to obtain a particle size of 31-11 mesh Hot sand; then lower the temperature to 111°C, add the activator solution that step (1) obtains, the add-on of activator solute (labeinite) is 1.1wt% of foundry old sand (organic sand) weight, at 611r / min at a high speed for 11 min to obtain the regenerated sand.

Embodiment 2

[0043] A kind of regenerated sand for foundry cold core, its preparation method comprises the following steps:

[0044] (1) Take 11 g of langbeinite and add it to 111 mL of water at a temperature of 21° C., stir and dissolve to obtain the active agent solution;

[0045] (2) Take foundry old sand-organic sand for pretreatment, the pretreatment is thermal old sand regeneration treatment method, specifically including crushing old sand, roasting at 811°C, and particle screening to obtain a particle size of 211-271 mesh Hot sand; then lower the temperature to 211°C, add the activator solution that step (1) obtains, the add-on of activator solute (labeinite) is 1.1wt% of foundry old sand (organic sand) weight, at 1111r / min at a high speed for 11 min to obtain the regenerated sand.

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Abstract

The invention provides a production method of reclaimed sand used for foundry cold cores. According to the method, foundry used sand and an activator bloedite are used as raw materials, the foundry used sand is evenly covered with the bloedite, and the obtained reclaimed sand is long in high-temperature heat-resistant time, high in high-temperature compressive strength and small in gas volume. According to the production method of the reclaimed sand used for the foundry cold cores, in a use process of the provided reclaimed sand, the bloedite is decomposed into sodium oxide and magnesium oxide under the high-temperature action, the sodium oxide and the magnesium oxide have fluxing action, and thus the melting point of silicon dioxide is lowered from 1111 DEG C to 711 DEG C, so that energy consumption is greatly reduced; in a pouring process, organic resin in the foundry used sand is decomposed into carbon under the high-temperature action, the carbon is reacted with the sodium oxide, the magnesium oxide and the silicon dioxide, which is the main component of the foundry used sand, to form dense glass layers on sand core wall surfaces in contact with surfaces of castings, and thus molten iron is prevented from permeating into the sand cores, so that sand adhesion to the castings is avoided; and the provided method is wide in raw material source and low in cost, resources are recycled, and green production of the foundry industry is promoted.

Description

technical field [0001] The invention belongs to the technical field of reusing foundry old sand, and in particular relates to a preparation method and application of regenerated sand for foundry cold cores. Background technique [0002] The engine and cylinder head of traditional trucks usually use casting methods in the manufacturing process, and the recycling of old casting sand to replace new sand in the casting process is an urgent requirement and necessity to realize energy saving and emission reduction of enterprises and green production of my country's foundry industry trend. The inner cavity of the cylinder block and the cylinder head of the truck is complicated, and the sand core is made of special sand coated with a layer of phenolic resin. , The amount of gas released when the resin burns is large. If the gas stays in the casting, the body of the engine will not be dense, causing fatal problems such as oil leakage. The resin content of cold core sand is only abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/04B22C1/02B22C3/00B22C9/10
CPCB22C5/0409B22C1/02B22C3/00B22C9/10
Inventor 尹海军刘栋包羽冲李卓情秦文兵
Owner 襄阳仁创铸造材料有限公司
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