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Method utilizing ultrasonic technology to regenerate used sodium silicate sand

A kind of water glass sand and ultrasonic technology, which is applied in the cleaning/processing machinery of casting materials, casting molding equipment, metal processing equipment, etc., can solve the problem of high water consumption, difficulty in wet regeneration, low regeneration rate problem, to achieve excellent casting effect and the effect of reducing regeneration cost

Active Publication Date: 2015-03-11
天津众智科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Through years of research and exploration, it has been found that the dry regeneration rate of sodium silicate used sand is low and poor, and the problems of high water consumption and difficulty in wet regeneration and high energy consumption for wet sand drying have not been completely resolved.

Method used

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  • Method utilizing ultrasonic technology to regenerate used sodium silicate sand
  • Method utilizing ultrasonic technology to regenerate used sodium silicate sand
  • Method utilizing ultrasonic technology to regenerate used sodium silicate sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Prepare a sodium hydroxide solution with a mass concentration of 15%.

[0034] (2) According to the volume ratio of the used sodium silicate sand to the sodium hydroxide solution at 1:1, put the used sodium silicate sand into the prepared sodium hydroxide solution for immersion, soak at room temperature for 16 hours, and separate the sodium silicate sand after the immersion is completed , NaOH with a mass of 3% of the mass of the lye is added to the lye for recycling.

[0035] (3) Place the old sodium silicate sand immersed in step (2) in clean water, and use ultrasonic ultrasound with a frequency of 25 kHz for 25 minutes, and the mass ratio of the old sodium silicate sand to water is 1:2.

[0036] (4) The water glass sand after ultrasonic in step (3) is filtered and separated from the waste liquid, and the water glass sand is washed and then dried to obtain stripped reclaimed sand. The washing wastewater is filtered to obtain waste residue and washing water. The waste re...

Embodiment 2

[0039] (1) Prepare a sodium hydroxide solution with a mass concentration of 5%.

[0040] (2) According to the volume ratio of the used sodium silicate sand and the sodium hydroxide solution as 1:2, put the used sodium silicate sand into the prepared sodium hydroxide solution and soak for 36h at room temperature. After the immersion is completed, the sodium hydroxide solution will be separated. , NaOH with a mass of 1% of the mass of the lye is added to the lye for recycling.

[0041] (3) Place the old sodium silicate sand immersed in step (2) in a NaOH solution with a mass concentration of 20%, use ultrasonic ultrasound with a frequency of 50 kHz for 48 minutes, and the mass ratio of the old sodium silicate sand to water is 1:5.

[0042] (4) The water glass sand after ultrasonic in step (3) is filtered and separated from the waste liquid, and the water glass sand is washed and dried to obtain the stripped regenerated sand. The washing wastewater is filtered to obtain waste residue a...

Embodiment 3

[0045] (1) Prepare a sodium hydroxide solution with a mass concentration of 20%.

[0046] (2) According to the volume ratio of the used sodium silicate sand to the sodium hydroxide solution of 1:1.2, put the used sodium silicate sand into the prepared sodium hydroxide solution and soak for 24 hours at room temperature. After the immersion is completed, separate the sodium silicate sand , NaOH with a mass of 4% of the mass of the lye is added to the lye for recycling.

[0047] (3) Place the old water glass sand immersed in step (2) in clean water, and use ultrasonic ultrasound with a frequency of 150 kHz for 5 minutes, and the mass ratio of the old water glass sand to water is 1:1.

[0048] (4) The water glass sand after ultrasonic in step (3) is filtered and separated from the waste liquid, and the water glass sand is washed and then dried to obtain stripped reclaimed sand. The washing wastewater is filtered to obtain waste residue and washing water. The waste residue is subjected t...

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Abstract

The invention discloses a method utilizing an ultrasonic technology to regenerate used sodium silicate sand. The method comprises the following steps: soaking used sodium silicate sand in a prepared sodium hydroxide solution, then separating the sodium silicate sand from the sodium hydroxide solution, placing the soaked sodium silicate sand in clean water or an alkali solution with a mass concentration of 0 to 20%; then subjecting the solution to an ultrasonic treatment by ultrasonic waves with a frequency of 20 to 200 kHz, then separating the sodium silicate sand from the waste liquid so as to obtain sodium silicate sand and waste liquid containing waste residues; washing the obtained sodium silicate sand, and drying so as to obtain regenerated sodium silicate sand with a demoulding rate more than 95%. The provided method has the advantages of high regeneration demoulding rate, no pollution, and good usability of regenerated sand.

Description

Technical field [0001] The invention relates to a method for regenerating used sodium silicate sand by adopting ultrasonic technology. Background technique [0002] Water glass sand has the advantages of high strength, low cost, simple process, odorless, environmentally friendly, low energy consumption, and good casting quality. It is the most likely type of sand for green casting. As the largest country in foundry, more than 90% of steel castings are produced using sodium silicate sand technology, which produces 6-8 million tons of sodium silicate sand every year. At present, except for partial reuse, old sodium silicate sand is basically disposed of by landfill, which not only wastes limited silica sand resources, but also increases disposal costs and seriously pollutes the ecological environment. Therefore, it is imminent to develop a new technology of high-efficiency sodium silicate sand regeneration and realize the regeneration and reuse of sodium silicate sand, and it is a...

Claims

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Application Information

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IPC IPC(8): B22C5/00
CPCB22C5/00
Inventor 张福丽常云峰
Owner 天津众智科技有限公司
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