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Preparation method of nano rare-earth hydrosol

A nano-rare earth and hydrosol technology, which is applied in the manufacture of tools, casting molding equipment, metal processing equipment, etc., can solve the problems of easy agglomeration, achieve good dispersion, improve the working environment, and increase the effect of product conversion rate

Active Publication Date: 2013-01-23
CHANGZHOU GEOQUIN NANO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to solve the technical problem that the traditional binder nano-rare earth oxide dispersion is easy to agglomerate in the existing investment casting, the present invention provides a preparation method of nano-rare earth hydrosol. The nano-rare-earth hydrosol has good stability, and it can replace the traditional nano-rare-earth oxide dispersion system. The shell has high strength, is not easy to deform, and can withstand high temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The praseodymium chloride solution obtained by separating the rare earth ore through the extraction tank is adjusted to a concentration of 0.2mol / L and a pH of 1.0. Take 750ml of this solution and put it in a water bath at 25°C. Add 10ml of hydrogen peroxide and keep stirring. Take 132ml of concentrated ammonia water. Add 726ml of water to mix, heat at 45°C and quickly pour into the above solution, adjust the temperature to 55°C, take a water bath for 2 hours, rise to 95°C, stir for 10 minutes, filter with suction, wash, add 5ml to the filter cake with a concentration of 69 % concentrated nitric acid, add 500ml of water, and stir at 70°C for 30 minutes to obtain a green transparent sol. The average primary particle size is 10-30nm, and the particles are spherical and well dispersed through transmission electron microscope detection.

Embodiment 2

[0010] The cerium chloride solution obtained by separating the rare earth ore through the extraction tank is adjusted to a concentration of 0.5mol / L and a pH of 3.0. Take 576ml of this solution and put it in a water bath at 50°C and 50°C. Add 20ml of hydrogen peroxide and keep stirring. Take 200ml of concentrated ammonia water , add 1100ml of water, mix and place it at 45°C for a little heating, then quickly pour into the above solution, adjust the temperature to 85°C, take a water bath for 4.5 hours, rise to 95°C, stir for 30 minutes, suction filter, wash, and add 30ml of concentration to the filter cake Add 1000ml of water to 69% concentrated nitric acid, and stir at 95°C for 50 minutes to obtain a dark orange-red transparent sol. The average primary particle size is 1-5nm, and the particles are spherical and well dispersed through transmission electron microscope detection.

Embodiment 3

[0012] The yttrium chloride solution obtained by separating the rare earth ore through the extraction tank is adjusted to a concentration of 1.0mol / L and a pH of 2.0. Take 440ml of this solution and place it in a water bath at 35°C. Add 8ml of hydrogen peroxide and keep stirring. Take 170ml of concentrated ammonia water. Add 940ml of water, heat at 28°C after mixing, quickly pour into the above solution, adjust the temperature to 65°C, take a water bath for 3 hours, rise to 95°C, stir for 35 minutes, filter with suction, wash, add 10ml to the filter cake with a concentration of 69 % concentrated nitric acid, add 800ml of water, and stir at 80°C for 40 minutes to obtain a colorless transparent sol. The average primary particle diameter is 5-10nm, the particles are spherical, and monodisperse well.

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Abstract

The invention relates to a preparation method of a nano hydrosol, in particular to a preparation method of a nano rare-earth hydrosol, which comprises the following process flow: preparing a chloride solution into a solution A with the concentration of 0.2-1.5mol / L and the pH value of 1-5; placing in a water bath at 25-65 DEG C; adding hydrogen peroxide, wherein the volume ratio of the hydrogen peroxide to the solution A is 1:(30-75); stirring to obtain a mixed solution B; mixing strong ammonia water with water in the volume ratio to obtain a precipitant C; slightly heating at 30-45 DEG C, and then pouring into the mixed solution B; regulating the temperature to 55-85 DEG C for water bath for 2-5h; raising the temperature to 95 DEG C; stirring for 10-45 min, then filtering and washing; adding a saltpeter solution in a filter cake; and stirring at 70-95 DEG C for 25-60 min to obtain the nano rare-earth hydrosol. The invention solves the technical problem that a nano rare-earth oxide dispersion as a traditional adhesive in the conversional fired mold casting is easy to cause agglomeration.

Description

technical field [0001] The invention relates to a preparation method of nanometer hydrosol, in particular to a preparation method of nanometer rare earth hydrosol. Background technique [0002] In investment casting, the traditional binder is a dispersion system of nano-rare earth oxides. However, the dispersion of nano-rare earth oxides has poor stability and is prone to agglomeration when stored for a period of time. Contents of the invention [0003] The technical problem to be solved by the present invention is: in order to solve the technical problem that the traditional binder nano-rare earth oxide dispersion is easy to agglomerate in the existing investment casting, the present invention provides a preparation method of nano-rare earth hydrosol. The nano-rare earth hydrosol has good stability. If it is used to replace the traditional nano-rare-earth oxide dispersion system, the molded shell has high strength, is not easy to deform, and can withstand high temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18B22C9/04
Inventor 施丽萍
Owner CHANGZHOU GEOQUIN NANO NEW MATERIALS
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