Regeneration method of casting wet type mixed old sand

A used sand and wet mold technology is applied in the field of casting wet mold mixed used sand regeneration. The particle shape is round and the effect of reducing the amount of sand hair

Active Publication Date: 2016-07-06
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a dry-wet regeneration method without high-temperature roasting. The acid consumption value, gas generation, and loss on ignition of the recycled sand are poor, and the regeneration effect is poor.

Method used

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  • Regeneration method of casting wet type mixed old sand
  • Regeneration method of casting wet type mixed old sand
  • Regeneration method of casting wet type mixed old sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for regenerating old sand mixed with casting green molds, comprising the following steps:

[0053] 1) Magnetic separation, screening, and crushing of the foundry wet mixed old sand: After magnetic impurities are selected from the old sand through magnetic separation, sand blocks larger than 5 mesh are screened out through a screening machine, and the sand blocks are crushed with a crusher. Filter through a 12-mesh sand net, and sand blocks larger than 12 mesh return to the crusher;

[0054] 2) The old sand pretreated in step 1) is firstly cleaned and deslimed by a spiral sand washing machine, and then enters a 6-barrel series scrubbing machine for water scrubbing. The mass ratio of sand and water in scrubbing is 1:5. Put the sand on the hardened ground to control water, and the mud content of the sand after scrubbing is <0.3%;

[0055] 3) Use a drying drum to dry and preheat the non-agglomerated sand after water scrubbing and water control. The drying temperat...

Embodiment 2

[0059] A method for regenerating old sand mixed with casting green molds, comprising the following steps:

[0060] 1) Magnetic separation, screening, and crushing of the foundry wet mixed old sand: the old sand is magnetically separated to select magnetic impurities, and then the sand blocks larger than 5 mesh are screened out through a screening machine, and the sand blocks are crushed by a crusher. After crushing, the sand blocks are passed 12-mesh sand mesh filter, sand larger than 12 mesh returns to the crusher;

[0061] 2) The old sand pretreated in step 1) is firstly cleaned and deslimed by a spiral sand washing machine, and then enters a 6-barrel series scrubbing machine for water scrubbing. The mass ratio of sand and water in scrubbing is 1:3. Put the sand on the hardened ground to control water, and the mud content of the sand after scrubbing is <0.5%;

[0062] 3) Use a drying drum to dry and preheat the non-agglomerated sand after water scrubbing and water control. ...

Embodiment 3

[0066] A method for regenerating old sand mixed with casting green molds, comprising the following steps:

[0067] 1) Magnetic separation, screening, and crushing of the foundry wet mixed old sand: the old sand is magnetically separated to select magnetic impurities, and then the sand blocks larger than 5 mesh are screened out through a screening machine, and the sand blocks are crushed by a crusher. After crushing, the sand blocks are passed 12-mesh sand mesh filter, sand larger than 12 mesh returns to the crusher;

[0068] 2) The old sand pretreated in step 1) is firstly cleaned and deslimed by a spiral sand washing machine, and then enters a 3-barrel series scrubbing machine for water scrubbing. The mass ratio of sand and water in scrubbing is 1:1. Put the sand on the hardened ground to control water, and the mud content of the sand after scrubbing is <0.5%;

[0069] 3) Use a drying drum to dry and preheat the non-agglomerated sand after scrubbing with water and control th...

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Abstract

The invention relates to a regeneration method of casting wet type mixed old sand. The regeneration method comprises the following steps: preprocessing casting wet type mixed old sand; wiping with water; drying; preheating; roasting; and post-processing. In the invention, components, such as bentonite, coal dust and ashes, in wet type old sand are effectively removed by a water wiping process, and a residual resin film in mixed old sand is thoroughly decomposed by a roasting process. The regeneration cost is low, and the regeneration effect is great. Actual production and verification show that the performance indexes of regenerated sand reach or surpass those of new sand. The regeneration method is successively applied to the core making production of cold boxes and has remarkable economical and social benefits.

Description

technical field [0001] The invention relates to a method for regenerating mixed old sand for casting green molding, which belongs to the technical field of green sand casting. Background technique [0002] The regeneration of old foundry sand is an important issue faced by the foundry industry. According to the composition and characteristics of the used foundry sand, there should be different regeneration processes. At present, the regeneration process of used resin sand is relatively mature at home and abroad, but there are technical difficulties in the regeneration of mixed used sand for foundry green molding. Foundry green mixed old sand is mainly composed of two parts, one part is green molding used sand, and the other part is resin old sand mixed with waste sand core. The key to the regeneration of wet mold mixed old sand is to completely remove the powdery substances such as bentonite and coal powder in the molding sand and the resin film in the resin sand; the resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00
CPCB22C5/00
Inventor 刘庆义李娜臧加伦张传海庄肃栋孙玉成
Owner WEICHAI POWER CO LTD
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