Ultrasonic wet method for recycling old water glass sand

A technology of wet regeneration and water glass, which is applied in the cleaning/processing machinery of casting mold materials, casting molding equipment, metal processing equipment, etc., can solve the problems of large sewage discharge, reduce water consumption, and difficult treatment, and achieve Reduced water consumption, reduced difficulty, and simple overall process

Active Publication Date: 2017-06-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for regenerating old water glass sand by ultrasonic wet method, through ultrasonic solubilization and reuse of spent alkali solution, the water consumption is reduced under the condition of ensuring a high stripping rate. amount, thereby solving the technical problems of large sewage discharge and difficult treatment when regenerating old water glass sand by wet method

Method used

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  • Ultrasonic wet method for recycling old water glass sand

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Effect test

Embodiment 1

[0032] (1) Add the old water glass sand to a certain quality of water (sand water mass ratio 1:0.25) and mix it, treat it with an ultrasonic wave with a frequency of 15kHz for 30 minutes, dehydrate it by centrifugation until the moisture content of the wet sand is 3%, and measure its sodium oxide Content, higher than 0.05%, continue to process;

[0033] (2) Add the dehydrated wet sand (preliminary regenerated sand) into a certain quality of water (sand-water mass ratio 1:0.25), treat it with ultrasonic waves with a frequency of 15kHz for 30 minutes, and centrifugally dehydrate the wet sand until the moisture content of the wet sand is 3%. Measure its sodium oxide content, if it is higher than 0.05%, continue processing;

[0034] (3) Add the dehydrated wet sand (secondary regenerated sand) into a certain quality of water (sand-water mass ratio 1:0.2), treat it with ultrasonic waves with a frequency of 15kHz for 10 minutes, and centrifugally dehydrate the wet sand until the mois...

Embodiment 2

[0039] (1) Add the old water glass sand to a certain amount of waste lye (steps 3 and 4 of Example 1, sand-to-water mass ratio 1:0.4) and mix, and use a frequency of 20kHz for ultrasonic treatment for 30 minutes, then centrifuge and dehydrate to wet The moisture content of the sand is 3%, measure its sodium oxide content, if it is higher than 0.05%, continue to process;

[0040] (2) Add the dehydrated wet sand (preliminary regenerated sand) into a certain quality of water (sand-water mass ratio 1:0.35), treat it with ultrasonic waves with a frequency of 20kHz for 15 minutes, and centrifugally dehydrate the wet sand until the moisture content of the wet sand is 3%. Measure its sodium oxide content, if it is higher than 0.05%, continue processing;

[0041](3) Add the dehydrated wet sand (secondary regenerated sand) into a certain quality of water (sand-water mass ratio 1:0.3), treat it with ultrasonic waves with a frequency of 20kHz for 5 minutes, and centrifugally dehydrate the...

Embodiment 3

[0046] (1) Add the old sodium silicate sand to a certain quality of waste lye (step 4 of Example 2, the mass ratio of sand to water is 1:0.3) and mix them, and use an ultrasonic wave with a frequency of 28kHz for 25 minutes to dehydrate the wet sand until the wet sand contains water The rate is 3.5%, measure its sodium oxide content, if it is higher than 0.05%, continue to process;

[0047] (2) Add the dehydrated wet sand (preliminary regenerated sand) into a certain quality of water (sand-water mass ratio 1:0.25), treat it with ultrasonic waves with a frequency of 28kHz for 20 minutes, and dehydrate the wet sand until the moisture content of the wet sand is 3.5%. Measure its sodium oxide content, if it is higher than 0.05%, continue processing;

[0048] (3) Add the dehydrated wet sand (secondary regenerated sand) into a certain quality of water (sand-water mass ratio 1:0.25), treat it with ultrasonic waves with a frequency of 28kHz for 10 minutes, and dehydrate the wet sand u...

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Abstract

The invention belongs to the technical field of recycle of old water glass sand, and discloses an ultrasonic wet method for recycling the old water glass sand. The ultrasonic wet method comprises the following steps: adding initial old water glass sand into water or an alkaline solution, mixing the two, performing ultrasonic treatment for 1-30 minutes to obtain a sand and water mixture, dewatering the sand and water mixture till the water content is not higher than 4% to obtain initial recycled sand and a waste alkali solution, adding the initial recycled sand into water, and repeating processes of mixing, ultrasonic treatment and dewatering till the sodium oxide content of the recycled sand is not higher that 0.05% so as to achieve the recycle of the old water glass sand. By the ultrasonic wet method, the obtained recycled sand is high in release rate (higher than 95%) and good in performance; in addition, the water consumption is low, so that the sewage amount can be reduced and the sewage treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of regenerating used water glass sand, and more specifically relates to a method for regenerating used water glass sand by ultrasonic wet method. Background technique [0002] Sodium silicate sand is non-toxic, tasteless, high strength, low cost, and good fluidity. It is widely used in the production of steel castings in my country. As a large casting country, my country produces millions of tons of used water glass sand every year. At present, water glass Most of the used sand is landfilled except for part of it being used as building materials and recycling, which not only wastes silica sand resources, but also pollutes the environment. The "Access Conditions for the Foundry Industry" promulgated in 2013 requires that the recycling rate of used water glass sand should not exceed It is lower than 60%. Therefore, the regeneration and reuse of the old water glass sand is imperative; the regeneration and reuse o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00B22C5/08
CPCB22C5/00B22C5/08
Inventor 樊自田王黎迟刘富初蒋文明龚小龙
Owner HUAZHONG UNIV OF SCI & TECH
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