Reclaiming method for inorganic old sand

An inorganic, used sand technology, applied in the field of casting molding materials, can solve the problems of unsatisfactory casting, low sand core yield, poor quality of recycled sand, etc., to achieve clean production process, continuous production process, and better quality of recycled sand Effect

Inactive Publication Date: 2019-01-08
HEFEI RENCHUANG CASTING MATERIAL CO LTD
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  • Abstract
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Problems solved by technology

Among them, the reclaimed sand obtained by the water method is of good quality, but the consumption of water resources is too large, and the investment cost is high; the dry method is to directly use the inorganic sand after m

Method used

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  • Reclaiming method for inorganic old sand
  • Reclaiming method for inorganic old sand

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Embodiment 1

[0043] A method for regenerating inorganic old sand, comprising the following steps:

[0044] (1) The first mechanical regeneration: After the ammonium salt is mixed with the old inorganic sand, it is crushed into particles below 6mm by a vibrating crusher. After the crushing is completed, it is sieved to obtain the primary mechanical regeneration sand. The types of ammonium salts and the mass ratio of ammonium salts to inorganic old sand are shown in Table 1.

[0045] (2) Regeneration by thermal method: heat the primary mechanically regenerated sand in a roasting furnace. See Table 1 for the heating temperature and heating time. During the heating process, air is introduced to make the primary mechanical reclaimed sand in a state of boiling heating.

[0046] (3) The second mechanical regeneration: Mechanically grind the thermally regenerated sand in an air-cooled device, while cooling down, and sieve to obtain the secondary mechanically regenerated sand. During this process, ...

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Abstract

The invention relates to a reclaiming method for inorganic old sand. The reclaiming method for the inorganic old sand comprises the following steps: (1) first-time mechanical reclaiming: crushing theinorganic old sand to obtain primary mechanical reclaimed sand; (2) hot-method reclaiming: heating the primary mechanical reclaimed sand to obtain hot-method reclaimed sand; (3) second-time mechanicalreclaiming: mechanically grinding the hot-method reclaimed sand, and meanwhile cooling to obtain secondary mechanical reclaimed sand; and (4) removing broken impurities in the secondary mechanical reclaimed sand to obtain inorganic reclaimed sand. The content of sodium oxide in the inorganic reclaimed sand obtained by the method is lower than 0.1%, the inorganic reclaimed sand can be directly used as facing sand, the strength of the inorganic reclaimed sand is not lower than crude sand, the loss on ignition and the acid demand value of the inorganic reclaimed sand are close to the loss on ignition and the acid demand value of the crude sand, and the performance of the product is excellent.

Description

technical field [0001] The invention relates to the technical field of casting molding materials, in particular to a method for regenerating old inorganic sand. Background technique [0002] Inorganic sand is a non-polluting, clean casting material that is commonly used in the casting process of auto parts. However, due to the limitations of the regeneration process of inorganic sand and the poor performance of recycled sand, the expected development effect of inorganic sand has not been achieved. With the increasingly stringent environmental protection requirements, the foundry industry is facing a major test. The harmful gas emission of organic sand makes it less and less suitable for the needs of future industrial development, and inorganic sand has re-entered the field of vision of the foundry industry. However, the research and development of inorganic sand recycling technology can not only save production costs, but also an inevitable requirement for the development ...

Claims

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Application Information

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IPC IPC(8): B22C5/00B22C5/04B22C5/06B22C5/10
Inventor 冯俊龙尹海军李卓情包羽冲胡文志
Owner HEFEI RENCHUANG CASTING MATERIAL CO LTD
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