A method for regenerating sand for large steel castings and high temperature resistant coated sand prepared from the regenerated sand

A technology for steel castings and reclaimed sand, which is applied to the cleaning/processing machinery of casting materials, casting molding equipment, cores, etc. It can solve the problems of single used sand and the inability to completely remove the surface substances of mixed used sand, etc. Achieve the effect of realizing recycling, increasing removal ratio and accelerating sedimentation speed

Active Publication Date: 2022-06-24
YANCHENG RENCHUANG SAND IND TECH CO LTD
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Problems solved by technology

[0007] However, the above-mentioned existing technologies are all regeneration methods of a single old sand, and the binders are all organic resins, which do not involve inorganic coatings on the surface of green sand, and the regeneration of old sand is relatively easy
Moreover, the above-mentioned existing technologies all adopt thermal regeneration. After high-temperature roasting, sieving treatment and acid solution treatment are used to treat the surface. The salt generated by acid-base neutralization will be adsorbed on the surface of the regenerated sand, and the fundamental removal of the surface substances of the mixed old sand cannot be achieved.

Method used

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  • A method for regenerating sand for large steel castings and high temperature resistant coated sand prepared from the regenerated sand
  • A method for regenerating sand for large steel castings and high temperature resistant coated sand prepared from the regenerated sand
  • A method for regenerating sand for large steel castings and high temperature resistant coated sand prepared from the regenerated sand

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preparation example Construction

[0068] ﹝Preparation method of high temperature resistant coated sand﹞

[0069] The invention also relates to high temperature resistant coated sand prepared from the regenerated sand, and the preparation method includes the following steps: preheating the regenerated sand to 120-150° C., then adding it to a sand mixer, and adding phenolic resin, sludge, silane coupling Aqueous agent, urotropine aqueous solution and calcium stearate are mixed uniformly, and coated sand is obtained after cooling.

[0070] In one embodiment of the present invention, the high temperature resistant coated sand is prepared by the following steps:

[0071] [1] Screening the obtained regenerated sand, the purpose is to remove the impurity particles and obtain the finished regenerated sand;

[0072] [2] After heating the finished reclaimed sand to 120-150℃ by a batch heater, put it into the coated sand mixer;

[0073] [3] Add phenolic resin to the coated sand mixer and stir for 20-50s;

[0074] [4] ...

Embodiment 1

[0078] (1) Mixed used sand regeneration and sludge collection

[0079] ① The mixed old sand core is crushed by the roller, and the particle size of the obtained mixed old sand is less than 20 meshes, and it is sent to the old sand silo.

[0080] ②The mixed old sand is lifted from the silo to the ultrasonic washing area through the bucket. The ultrasonic water tank is cylindrical, with a diameter and height of 2m. There are 20 ultrasonic vibrators inside, and the ultrasonic frequency is 40KHz. A stirring rotor is set in the center of the ultrasonic water tank, and the rotation frequency is 120r / min. A sand-water mixture was obtained after the ultrasonic washing was completed.

[0081] ③ Send the sand-water mixture to the dewatering screen for sand-water separation to obtain sewage and sand.

[0082] ④ The obtained sewage enters the reaction tank, and polyacrylamide with a sewage quality of 0.4‰ and polyaluminum chloride with a sewage quality of 4.0‰ are added to the tank to f...

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Abstract

The invention provides a method for regenerating sand for large-scale steel castings. The stubborn residual film on the surface of the old sand can be removed through the regeneration methods of ultrasonic cleaning, roasting to remove organic matter and quenching and leaching, and the performance of the regenerated sand is equivalent to that of the original sand. Even better than raw sand. Afterwards, the regenerated sand is used as aggregate, and the sludge generated during the regeneration process is used as a high-temperature-resistant auxiliary agent to produce high-temperature-resistant coated sand, realizing a circular economy of zero-emission old sand regeneration. The invention also provides the high-temperature-resistant coated sand prepared from the regenerated sand, whose high-temperature resistance performance is greatly improved due to the addition of regenerated sludge.

Description

technical field [0001] The invention relates to the technical field of resource recovery, in particular to a method for regenerating sand for large-scale steel castings, and high-temperature-resistant coated sand prepared from the regenerated sand. Background technique [0002] The manufacturing technology of large-scale steel castings has promoted the development of high-end manufacturing industries such as high-speed rail, ships, and electric equipment. The size of the sand core for such castings is large, and the internal and external inhomogeneities are prone to occur during the curing process (such as high surface strength and inner layer. not solidified). Using Piper resin as a binder can improve this problem, and the molding time is short, the process is simple, and the production efficiency can be improved. Therefore, large-scale steel casting enterprises widely use green sand as molding sand, and Piper resin sand as sand core for steel casting production. After th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C5/00B22C1/02B22C1/22
CPCB22C5/00B22C1/02B22C1/2253
Inventor 包羽冲尹海军李卓情刘栋储茂磊
Owner YANCHENG RENCHUANG SAND IND TECH CO LTD
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