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Water glass waste sand regeneration treatment method used for casting

A treatment method, water glass technology, applied in the cleaning/processing machinery of casting mold materials, casting molding equipment, manufacturing tools, etc., can solve the problems of low demoulding rate, low recycling rate, and difficult removal of sodium salt components, etc. problem, achieve the effect of reducing cost and improving removal rate

Inactive Publication Date: 2016-10-26
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country is a big foundry country. During casting, about 1.5 tons of foundry waste sand is produced for every ton of castings cast. The annual output of foundry waste sand in my country reaches more than 50 million tons. Many of them are disposed of by burial. Although there are some water glass waste Sand recycling method, but the recycling rate is low, and the sodium salt in the water glass waste sand is extremely difficult to get out, which will easily cause the refractoriness and cohesiveness of the recycled sand to decrease, and cause sand sticking in castings and other phenomena.
There are several ways to remove the film, but the removal rate is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A method for recycling glass waste sand in foundry water, comprising the following steps:

[0012] (1) Crushing 100kg of waste sand, passing through a 40-mesh sieve, putting the waste sand into the washing tank, washing with 300L of sodium citrate solution with a mass fraction of 2%, and using ultrasonic waves during the washing process, the ultrasonic frequency is 25 -28KHz, after shaking for 10 minutes, press 2.6m 3 Add hydrochloric acid solution with a mass fraction of 6.2% at a flow rate of 130 L, stir at 25°C for 15 minutes, filter, and remove the filtrate to obtain pretreated sand;

[0013] (2) Put the pretreated sand processed in step (1) into the high-temperature furnace, and treat it at 524°C for 10-15min. During the processing, feed the mixed gas of nitrogen and oxygen into the high-temperature furnace, The volume ratio is 12.2:1, and the velocity of the mixed gas is 0.88 m 3 / min, get secondary treatment sand;

[0014] (3) Use a magnetic separator to perfo...

Embodiment 2

[0017] A method for recycling glass waste sand in foundry water, comprising the following steps:

[0018] (1) Crushing 100kg of waste sand, passing through a 40-mesh sieve, putting the waste sand into the washing tank, washing with 300L of sodium citrate solution with a mass fraction of 2%, and using ultrasonic waves during the washing process, the ultrasonic frequency is 28KHz , after shaking for 10 minutes, press 3m 3 Add hydrochloric acid solution with a mass fraction of 6.2% at a flow rate of 140 L, stir at 25°C for 14 minutes, filter, and remove the filtrate to obtain pretreated sand;

[0019] (2) Put the pretreated sand processed in step (1) into a high-temperature furnace, and treat it at 525°C for 12 minutes. During the treatment, a mixture of nitrogen and oxygen is introduced into the high-temperature furnace, and the volume ratio of nitrogen and oxygen is It is 12.2:1, and the inlet velocity of the mixed gas is 0.87m 3 / min, get secondary treatment sand;

[0020] ...

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Abstract

The invention relates to a water glass waste sand regeneration treatment method used for casting. The water glass waste sand regeneration treatment method comprises the following steps that (1) waste sand is pretreated; (2) the pretreated sand in the step (1) is put into a high-temperature furnace and treated for 10-15 min at the temperature of 523 DEG C-525 DEG C, the mixed gas of nitrogen and oxygen is introduced into the high-temperature furnace in the treatment process, the introducing speed of the mixed gas is 0.85-0.9 m<3> / min, and secondary treatment sand is obtained; and (3) the secondary treatment sand is subjected to magnetic separation through a magnetic separator, the secondary treatment sand subjected to magnetic separation treatment is crushed, passes a 60-mesh screen and is then washed, and the washed secondary treatment sand is dried at the temperature of 55 DEG C, so that regenerated sand is obtained. The residual quantity of Na2O treated through the water glass waste sand regeneration treatment method is reduced to about 0.05%, the treated waste sand can be again used as new sand, and waste liquid treated through the method can be recycled, so that the treatment cost is reduced.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a method for regenerating waste glass sand used for casting. Background technique [0002] my country is a big foundry country. During casting, about 1.5 tons of foundry waste sand is produced for every ton of castings cast. The annual output of foundry waste sand in my country reaches more than 50 million tons. Many of them are disposed of by burial. Although there are some water glass waste Sand recycling method, but the recycling rate is low, and the sodium salt in the sodium silicate waste sand is extremely difficult to get out, which will easily cause the refractoriness and cohesiveness of the reclaimed sand to decrease, and cause sand sticking in castings. There are several ways to remove the film, but the removal rate is not high. Contents of the invention [0003] The purpose of the present invention is to provide a method for regeneration treatment of waste glass san...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00
CPCB22C5/00
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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