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Chemical regeneration method in casting waste sand disposing process

A technology of chemical regeneration and casting waste sand, which is applied in the cleaning/processing machinery of casting mold materials, casting molding equipment, manufacturing tools, etc. It can solve the problems that impurities cannot be completely removed, and achieve improved chemical resistance to sand sticking and good economy. Good performance and good overall effect of waste sand regeneration

Inactive Publication Date: 2011-04-06
CHONGQING CHANGJIANG RIVER MOLDING MATERIAL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still not possible to completely remove the impurities (adsorbed dust, oxides, etc.) in the uneven pits on the surface of the sand grains.

Method used

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  • Chemical regeneration method in casting waste sand disposing process
  • Chemical regeneration method in casting waste sand disposing process
  • Chemical regeneration method in casting waste sand disposing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment one (see figure 1 ):

[0040] 1. Crushing and screening waste sand:

[0041] Batches of resin with particle sizes ranging from 20 / 40, 40 / 20, 30 / 50, 50 / 30, 40 / 70, 70 / 40, 50 / 100, 100 / 50, 70 / 140, 140 / 70, 100 / 200 After the waste sand or green mold sand is unloaded, it is processed by a vibrating crusher, and unbroken metal blocks (such as iron blocks, aluminum blocks, etc.) are removed from the screen surface after passing through a 4-mesh screen.

[0042] 2. Thermal regeneration:

[0043] The waste sand from which large aggregates and sundries have been removed is fed into the vertical two-stage waste sand roaster from the sand adding device at the top of the roaster, and the waste sand is fully preheated by being heated by the flue gas heat exchange system in the roaster , After roasting at 600-700°C, release the sand out of the furnace with a sand output of 5 tons per hour, and cool it by air in a fluidized fluidized bed, take a sand sample to measure the P...

Embodiment 2

[0047] Embodiment two (see figure 2 ):

[0048] 1. Crushing and screening waste sand:

[0049] Each batch of spent sand should have the same range of particle size values ​​(ie 40 / 70, 50 / 100, 70 / 140, etc.). The waste sand of the same batch passes through the crushing equipment to make the large waste sand pellets into small pieces, and then uses a vibrating screening machine with a screen of not less than 4 mesh (such as 8 mesh, 10 mesh, etc.) Unbroken metal pieces (such as iron pieces, aluminum pieces, etc.) are removed from the screen surface. The waste sand particles pass through the magnetic separation channel of the magnetic separator to further attract and remove the smaller granular or powdery metallic iron and its oxides that have not been removed during the screening process.

[0050] 2. Chemical and mechanical regeneration:

[0051] Put the cast alkali phenolic resin or green mold sand waste sand after iron removal into a stirrer with a mechanical stirring mecha...

Embodiment 3

[0060] Embodiment three (see image 3 ):

[0061]The alkali phenolic resin waste sand of the foundry factory A after being processed by the first step in the embodiment 1, after removing the magnetic metal impurities in the waste sand by a 4000 gauss conveyor belt type cylinder iron removal device, the waste sand is placed at room temperature Under the condition of 10-40℃, the surface conditioning solution I is used for surface chemical treatment. The surface conditioning solution is composed of industrial phosphoric acid and industrial hydrochloric acid in a mass ratio of 1-20:1-80 to form an aqueous solution with a molar concentration of 0.01-1mol / L. One side of the curtain-like sand flow falling from the sand outlet of the cylindrical sand bucket is sprayed on the surface of the sand curtain, and the meter is adjusted by 5-15 liters per second. The treated recycled sand enters the silo for storage for 1-24 hours for mechanical grinding. Grind in the grinding equipment for ...

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Abstract

The invention provides a chemical regeneration method in the casting waste sand disposing process, relating to a process for performing surface chemical processing on various impurities which are attached on the surface of waste sand and are better not be reused in casting-form sand materials. During the chemical regeneration, chemical surface conditioning liquid I or / and chemical surface conditioning liquid II is or are used, and the disposing sand temperature is not more than 400 DEG C. The chemical regeneration method in the invention is carried out before or after the hot-method regeneration disposing or mechanical regeneration disposing of the casting waste sand disposing processing, and the chemical disposing technique is combined with the traditional hot-method regeneration and mechanical friction regeneration. The regeneration new sand formed in the method has better quality of the new sand, can better meet the application requirement on multi-form sand producing technique (hot core box, warm core box and cold core box) for recycling different casting waste sands (hot core box resin casting waste sand, warm core box resin casting waste sand, gas or / and organic fat hardening cold core box resin casting waste sand and profile damp die casting sand), and has better economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of mold casting sand core materials. Background technique [0002] The main component of quartz sand used in casting materials is SiO 2 , accounting for more than 92% of the sand weight, and the rest is about 5% Al 2 o 3 , about 0.5% Fe 2 o 3 , about 0.2% of CaO, about 0.1% of metal oxides such as MgO, and about 2% of moisture and mud (feldspar clay, etc.). The oxides in this are usually the same as SiO in quartz sand 2 Intergrowth, some are in the crystallization, and some are attached to SiO in the form of feldspar structure 2 the surface of the crystal. Quartz sand and various polymer resin organic binders are used to make resin-coated sand with different characteristics, because SiO 2 The crystalline structure is stable and has high temperature resistance, which is suitable for most casting applications. Foundry sand cores made of this material are used for metal smelting and pouring into metal...

Claims

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Application Information

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IPC IPC(8): B22C5/00
Inventor 熊鹰
Owner CHONGQING CHANGJIANG RIVER MOLDING MATERIAL GRP
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