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A method for completely regenerating sand from modified clay

A completely regenerated, clay-based technology, applied in the cleaning/processing machinery of casting mold materials, casting molding equipment, metal processing equipment, etc., can solve the problems of difficult large-scale operation, cumbersome production without ammonia water, etc., and improve the casting process performance effect

Active Publication Date: 2019-10-18
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As a further improvement to the above scheme, the ammonia-free water is replaced with freshly prepared primary distilled water with a conductivity ≤7 μS / cm, which can solve the problem of cumbersome production of ammonia-free water and difficult large-scale operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A method for completely regenerating sand with modified clay, the completely regenerated clay sand is the quaternary regenerated sand of coal powder and 15% furan resin self-hardening core sand, its acid consumption value is 14.26, the mud content is 0.181%, and the angular shape The coefficient is 1.13; wash the fully regenerated clay sand twice with ammonia-free water, then dry it at 150°C for 4 hours, and cool it naturally for later use; then at a temperature of 33°C, completely regenerate the above spare clay Add an aqueous solution of benzenesulfonic acid equivalent to 1.8% of its weight and a mass concentration of 3.5mol / L to the sand, heat and stir for 2.5 hours, then dry to constant weight; then mix it with carbon nanotubes equivalent to 4% of its weight, put it into the mill Rubbing in a wheel-type regenerator for 5 minutes, and then winnowing in a negative pressure fluidized bed for 10 minutes to obtain final product; wherein, the grinding wheel-type regenerato...

Embodiment 2

[0012] A method for completely regenerating sand with modified clay, the completely regenerated clay sand is the quaternary regenerated sand of coal powder and 15% furan resin self-hardening core sand, its acid consumption value is 14.26, the mud content is 0.181%, and the angular shape The coefficient is 1.13; the fully regenerated clay sand is washed twice with ammonia-free water, then dried at 140°C for 4 hours, cooled naturally and then used for later use; Add 1.5% of its weight of benzenesulfonic acid aqueous solution with a mass concentration of 4.5mol / L to the sand, heat and stir for 3 hours, then dry to constant weight; then mix it with 3.5% of its weight of carbon nanotubes, put it into the mill Rubbing in a wheel-type regenerator for 5 minutes, and then winnowing in a negative pressure fluidized bed for 10 minutes to obtain final product; wherein, the grinding wheel-type regenerator is a blade-grinding wheel-type regenerator, and the linear speed of the grinding wheel...

Embodiment 3

[0014] A method for completely regenerating sand with modified clay, the completely regenerated clay sand is the quaternary regenerated sand of coal powder and 15% furan resin self-hardening core sand, its acid consumption value is 14.26, the mud content is 0.181%, and the angular shape The coefficient is 1.13; wash the fully regenerated clay sand with ammonia-free water for 2 times, then dry it at 160°C for 4 hours, and cool it naturally for later use; then at a temperature of 35°C, completely regenerate the above spare clay Add 2.5mol / L benzenesulfonic acid aqueous solution equivalent to 2% of its weight into the sand, heat and stir for 2-3 hours, then dry to constant weight; then mix with 3.5% of its weight carbon nanotubes, put Put it into the grinding wheel type regenerator and rub it for 5 minutes, then winnow in a negative pressure fluidized bed for 10 minutes to obtain final product; wherein, the grinding wheel type regenerator is a blade grinding wheel type regenerator...

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Abstract

The invention belongs to the technical field of reutilization of returned clay sand, and particularly relates to a method for modifying clay completely-reclaimed sand. The method for modifying the clay completely-reclaimed sand specifically comprises the steps that firstly, the clay completely-reclaimed sand is washed twice with non-ammonia water, then dried for four hours at the temperature of 140-160 DEG C, and naturally cooled for standby; secondly, the standby clay completely-reclaimed sand is added with a benzenesulfonic acid water solution with the weight being about 1.5-2% of the weight of the standby clay completely-reclaimed sand and dried till the weight of the standby clay completely-reclaimed sand is constant after heat preservation is conducted for 2-3 hours; and then the clay completely-reclaimed sand is mixed with a carbon nano tube with the weight being 3.5-4.5% of the weight of the clay completely-reclaimed sand, the mixture is placed in a grinding wheel type regenerator to be rubbed for five minutes and then winnowed for ten minutes in a negative-pressure fluidized bed, and thus modified clay completely-reclaimed sand is obtained. Compared with the prior art, the method for modifying the clay completely-reclaimed sand has the following advantages that by washing the clay completely-reclaimed sand with the non-ammonia water, the tensile strength of furan resin self-hardening sand mixed with the modified sand can reach about 1.45 MPa within 24 h, the usable time is prolonged by about 20% compared with fresh sand, and the casting manufacturability of the furan resin self-hardening sand is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of reuse of old clay sand, and in particular relates to a method for completely regenerating sand from modified clay. Background technique [0002] With the transformation of China's national economy, the foundry industry has undergone industrial structure adjustment and transformation. It is a difficult problem to improve the recycling of old sand in the foundry industry. The regeneration and modification process of clay used sand has received more and more attention. The output of waste clay is increasing continuously, and waste clay sand is discarded as solid waste, which will pollute the environment and waste precious silica sand resources. Therefore, how to recycle waste clay sand has become one of the urgent problems to be solved in the foundry industry. It is of great significance to the sustainable development of China's foundry industry. At present, China's recycling of old clay sand is divided into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/16B22C5/04
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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