Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Prepn of nano-cobaltosic oxide powder

A nano-powder and cobalt salt technology, applied in the direction of cobalt oxide/cobalt hydroxide, cobalt carbonate, etc., can solve the problems of chemical composition, purity, particle size, crystal form, etc., and achieve easy control of parameters and simple process operation Effect

Inactive Publication Date: 2002-04-17
SHANDONG UNIV +1
View PDF0 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cobalt oxides produced by the rough production process in the past cannot meet the requirements of the production of LiCoO in terms of chemical composition, purity, particle size, and crystal form. 2 requirements

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
  • Prepn of nano-cobaltosic oxide powder
  • Prepn of nano-cobaltosic oxide powder
  • Prepn of nano-cobaltosic oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First, the cobalt flakes are dissolved in nitric acid with a volume ratio of 1:1 under heating conditions, and high-purity water is continuously added during the dissolution process to adjust the density and pH of the solution, and finally a density of 1.35 g / cm is obtained. 3 1. Cobalt nitrate solution with a pH value of 4.5, let it stand for a day, filter to remove the solid precipitate; then adjust the pH of the solution to 1.5 with nitric acid, carefully evaporate the solvent to obtain a cobalt nitrate solution with a density of 1.57, let it stand, cool, and precipitate Cobalt nitrate crystals. Analysis shows that the content of Fe element in the cobalt nitrate crystal is lower than 0.004%, and the content of Ni element is lower than 0.025%.

[0046] The chemical precipitant uses food grade NH 4 HCO 3 , the content of Na element is less than 0.02%. With 25 parts by weight (parts by weight, the same below) ammonium bicarbonate and 100 kilograms of high-purity wate...

Embodiment 2

[0049] Embodiment 2. As described in embodiment 1, the difference is:

[0050] Make the ammonium bicarbonate suspension that concentration is 14.3% weight percent with 25 parts of ammonium bicarbonate and 150 kilograms of high-purity water stand-by. Under stirring conditions, slowly add purified ammonium bicarbonate with a density of 1.60g / cm2 to the suspension of ammonium bicarbonate 3 solution of cobalt nitrate so that the weight ratio of substances:CO 3 2- / Co 2+ = 2.6, and adjust the pH of the supernatant after the reaction to 6.7. After the addition was complete, stirring was continued for 2.5 hours. Let stand and centrifuge. The solid cobalt content is controlled at 21%, and the separated clear liquid is recycled. Put the cobalt carbonate wet material obtained in the previous step into an appropriate container, raise the temperature to 400°C and keep it warm for 3.5 hours to obtain a black powder.

[0051] This process uses cobalt flakes and ammonium bicarbonate a...

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
Densityaaaaaaaaaa
Densityaaaaaaaaaa
Densityaaaaaaaaaa
Login to View More

Abstract

The present invention relates to chemical industry technology. The preparation of nanometer cobaltosic oxide powder includes purifying material, cobalt salt deposition, solid-liquid separation and solid calcination. Cobalt sheet is dissolved in nitric acid while being heated and high purity water is added to regulate solution density and pH value so as to obtain cobalt nitrate solution of 1.5-1.65 g / cu cm density and pH 4-5; ammonium bicarbonate suspension in 14-30 wt% is prepared with ammonium bicarbonate and water; cobalt nitrate solution is added into the suspension slowly to result in weight ratio of carbonate radical to cobalt ion being 2.4-2.6; and the wet cobalt carbonate material is heated to 300-450 deg.c for 3-6 hr to obtain black Co3O4 powder.

Description

(1) Technical field [0001] The present invention relates to a kind of nano material Co 3 o 4 A powder preparation method belongs to the technical field of chemical industry. (2) Background technology [0002] As a multifunctional material, metal oxide solid powders have many uses. At present, it is widely used as gas sensing material, humidity sensing material, temperature sensing material, infrared reflective material; as a catalyst in the petrochemical industry; as an additive in the paint, pigment, and ceramic industries. The following two fields cannot be ignored in the study of the synthesis of metal oxides: one is to prepare solid materials with uniform composition, size, shape, and porosity of various shapes, and to develop different functions of materials with different shapes or to make the existing functions of materials The second is to study the preparation method of simple and feasible metal oxide nanomaterials. [0003] Different types of oxides have differ...

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
IPC IPC(8): C01G51/04C01G51/06
Inventor 孙思修张卫民杨延钊王善政曹相民徐德华
Owner SHANDONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com