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Method for producing active admixture by using foundry waste sand

An active admixture and foundry technology, which is applied in the field of building materials, can solve the problems of difficult restoration of performance, large differences in natural sand, and difficult resource utilization, etc., to inhibit the formation of hydration products, delay cement hydration, The effect of improving mechanical properties

Active Publication Date: 2022-02-25
ANHUI KEBO BUILDING MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of chemical binders in water glass sand and resin sand, the waste sand has complex components on the one hand, and on the other hand, most of the waste sand is still agglomerated after falling out and has high mechanical strength. Generally, it is difficult to process only mechanical crushing Restoration of performance, so it is quite different from natural sand, and it is more difficult for resource utilization

Method used

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  • Method for producing active admixture by using foundry waste sand
  • Method for producing active admixture by using foundry waste sand
  • Method for producing active admixture by using foundry waste sand

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Preparation of phosphorous monomers:

[0035] Step A21. Mix epichlorohydrin and ethylene glycol, then add boron trifluoride ether solution, stir at 40°C for 60 minutes, then add N,N-dimethylacetamide and isopropanol, and reflux for 8 hours , to obtain intermediate 1; wherein, the molar ratio of epichlorohydrin, ethylene glycol and N,N-dimethylacetamide is 1:1:1;

[0036] Step A22. Mix intermediate 1, phenylphosphonic dichloride and N,N-dimethylaniline, and react at 130° C. for 10 h to obtain a phosphorus-containing monomer. Wherein, the molar ratio of intermediate 1 and phenylphosphonic dichloride is 2:1.

Embodiment 2

[0038] Prepare coating solution:

[0039] Step A11, after washing the waste casting sand, crush it until the particle size is less than 3 mm to obtain micropowder; wherein, the waste casting sand is water glass sand;

[0040] Step A12. Under the protection of nitrogen, mix the isophorone diisocyanate after vacuum dehydration with the phosphorus-containing monomer prepared in Example 1, and heat up to 80°C for 3 hours under constant stirring; add dimethylolbutyric acid and Acetone, continue to react for 2 hours; lower the temperature to below 50°C, add triethylamine to neutralize for 30 minutes; add fine powder, then use deionized water to adjust the solid content to 30%, and emulsify under high shear force for 30 minutes to obtain a solid content of about 30% coating solution. Wherein, the molar ratio of the amount of isophorone diisocyanate and the phosphorus-containing monomer is 1:1; the amount of dimethylol butyric acid is 5% of the total mass of the isophorone diisocyana...

Embodiment 3

[0044] Preparation of esterified monomers:

[0045] Stir the mixed acid anhydride and methallyl polyoxyethylene ether at 65°C for 2 hours. After the reaction, wash with saturated saline and sodium bicarbonate solution. After washing, extract with ethyl acetate. Organic The phase was concentrated under reduced pressure to remove the solvent to obtain an esterified monomer. Among them, the relative molecular mass of methallyl polyoxyethylene ether is 2400, and the mixed anhydride is formed by mixing styrene maleic anhydride and octenyl succinic anhydride in a molar ratio of 4:1; styrene maleic anhydride in the mixed anhydride The molar ratio of toric anhydride to methallyl polyoxyethylene ether is 3:1.

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Abstract

The invention relates to a method for producing an active admixture by using foundry waste sand, and belongs to the technical field of building materials, and the method comprises the following steps: uniformly mixing weighed raw materials: fly ash, an anti-crack component, a water reducing agent and an activating agent to obtain the active admixture; according to the method for producing the active admixture by using the foundry waste sand, the sodium silicate sand in the foundry waste sand is used as a raw material and is firstly prepared into the micro powder, the micro powder is used as a raw material to prepare the coating liquid, and then the basalt fiber is coated with the coating liquid, so that the surface roughness of the fiber is changed and the mechanical property of the basalt fiber is improved due to the existence of the micro powder; the concrete compressive strength is improved; and the utilization rate of the casting waste sand is improved, and the quality of finished products is also guaranteed. In addition, a self-made water reducing agent is added into the active admixture; compared with a carboxylic acid type water reducing agent, the product has better fluidity retentivity.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for producing active admixtures using foundry waste sand. Background technique [0002] As a solid waste, foundry waste sand has a great impact on the environment. In addition, sand mining has been limited in recent years, and there is a shortage of new sand resources for foundry. Therefore, more and more companies have abandoned the traditional throw-away practice and began to pay attention to the recycling of used sand. However, the circulation is limited, and there are still a large amount of foundry waste sand in actual production. Foundry waste sand is a solid waste with certain value, but also has certain hidden dangers of environmental impact. [0003] At present, the commonly used molding sand process in foundry production mainly includes clay sand, resin sand and water glass sand. The composition and properties of foundry waste sand dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08C04B14/46C04B20/10C04B24/32C08F283/06C08F230/02C08F220/06
CPCC04B40/0039C04B20/1055C04B14/4643C04B24/32C08F283/065C08F230/02C08F220/06C04B18/08C04B2103/302C04B12/04C04B20/1022Y02W30/91
Inventor 吕榕
Owner ANHUI KEBO BUILDING MATERIAL TECH
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