Method for manufacturing nano-ferrous acid in supercritical water

A technology of nano-cobalt ferrite and supercritical water, which is applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of complex process and high calcination temperature, and achieve the effect of simple process, good dispersion and easy agglomeration

Active Publication Date:
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are relatively few patents on the preparation method of nano-cobalt ferrite. Chinese patent (application number: 200410065678.4) reports the preparation method of combining microwave drying and calcination with high-energy ball mill ball milling to prepare nano-cobalt compounds. This method requires microwave drying and high calcination temperature. Obtaining solid powder requires ball milling, and the process is relatively complicated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for manufacturing nano-ferrous acid in supercritical water
  • Method for manufacturing nano-ferrous acid in supercritical water
  • Method for manufacturing nano-ferrous acid in supercritical water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 2g Co(NO 3 ) 2 ·6H 2 O was dissolved in 150ml deionized water, and Fe(NO 3 ) 3 9H 2 O, make the molar ratio of cobalt ion to iron ion r=0.5, stir the glass rod evenly; add 0.01~0.1mol / L NaOH dropwise to the mixed solution to adjust the pH=11; then pour the mixed solution into the supercritical water reaction equipment, open Heating furnace and magnetic stirrer, heating to 400°C, the corresponding pressure is 3920psi, and reacting for 1h; after the reaction, pass cooling water, pour out the mixture, filter on a vacuum filter, rinse with deionized water until neutral, 25°C Cobalt ferrite particles with good dispersibility can be obtained by drying, the particle size is 3-10nm, see figure 1 a and figure 2 Figure a in.

Embodiment 2

[0034] The difference from Example 1 is that the pH is adjusted to 13; cobalt ferrite particles with good dispersibility and a particle size of 3-10 nm are obtained.

Embodiment 3

[0036] The difference from Example 1 is: 1g Co(NO 3 ) 2 ·6H 2O was dissolved in 150ml deionized water, and Fe(NO 3 ) 3 9H 2 O, make the molar ratio of cobalt ions to iron ions r=0.5, stir evenly with a glass rod; obtain cobalt ferrite particles with good dispersion and particle size of 3-10 nm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
diameteraaaaaaaaaa
sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to the field of nanometer material preparation and super-critical water technical application, particularly the method of synthesizing nanometer cobalt ferrite by utilizing super-critical water. The preparation process comprises the following steps: dissolve the ferric nitrate and cobalt nitrate with a certain proportion in the deionized water and stir; regulate the Ph of the mixed liquid ranging from 9 to 13; pour the mixed solution into the kettle-type super-critical water reaction equipment, heat to 375 to 450 DEG C by continuous stirring and react for 0.5 to 6 hours; after the reaction, rapidly cool, filter, wash by deionized water and dry to get the cobalt ferrite grain with sound dispersion and average grain size of 5nm. The preparation method has the advantages of small environmental pollution and simple technology. The nanometer cobalt ferrite grain produced has magnetic, and thus has potential application in anisotropy permanent magnet, magnetic recorder, magnetic fluid and other fields.

Description

technical field [0001] The invention relates to the preparation of nanometer materials and the application of supercritical water technology, in particular to a method for synthesizing nanometer cobalt ferrite by supercritical water. Background technique [0002] The critical temperature of pure water is 647K, and the critical pressure is 22.1MPa. Above this temperature and pressure, it is called supercritical water. Compared with water at normal temperature, the physical properties of water in the supercritical state have changed greatly, mainly in: the dielectric constant becomes smaller, the hydrogen bond becomes weaker, the flow viscosity decreases, the diffusion coefficient becomes larger, and the organic matter and most Gases can be freely miscible, etc.; moreover, the solubility of inorganic salts in supercritical water is very small, showing the characteristics of organic solvents. Supercritical water has been widely used in organic wastewater treatment and metal ox...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01G49/16B82B3/00B01J3/00
CPCY02P20/54
Inventor 赵丹吴欣强关辉韩恩厚
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap