Production method of ferrous oxalate special for ferrous lithium phosphate

A technology of ferrous oxalate and a production method, which is applied in the field of preparation of known fine chemicals and can solve problems such as single crystal form

Inactive Publication Date: 2007-04-18
HEFEI ASIALON CHEM
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved is to improve the proc

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
  • Production method of ferrous oxalate special for ferrous lithium phosphate
  • Production method of ferrous oxalate special for ferrous lithium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] 1. Ferrous sulfate pretreatment

[0018] Put ferrous sulfate into a stainless steel water washing kettle, add pure water (distilled water) to stir and wash for 2 to 3 times, filter and separate, add the washed ferrous sulfate into an enamel dissolution kettle, add pure water to stir and dissolve, adjust pH with sulfuric acid To 3, add 2% sucrose at the same time, stir and dissolve, then stand still, clarify, and after filtration and separation, pump the ferrous sulfate clarified solution into the storage tank for subsequent use.

[0019] 2, the synthesis of ferrous monoclinic oxalate

[0020] Add oxalic acid and pure water into a stirring enamel synthesis kettle, stir and dissolve, and control the concentration of oxalic acid to 35-50 wt%. Slowly pass ammonia under stirring, at this time, the temperature in the kettle rises, when the temperature rises to 85-95°C (at this time, the ammonium acid ratio is about 7.5-3.5), stop passing ammonia, and add ferrous sulfate solu...

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

No PUM Login to view more

Abstract

The present invention relates to a method for preparing ferrous oxalate. Said method uses ferrous sulfate and oxalic acid as raw material, and includes the following steps: pretreatment of ferrous sulfate, said pretreatment includes: water-washing ferrous sulfate and inhibiting hydrolysis of its aqueous solution; mixing the pretreated ferrous sulfate with ammonium oxalate and oxalic acid according to the mole ratio of 3:7-8:2 to obtain their mixed solution; making said mixed solution produce reaction for 10-20 min at 65-95 deg.C, then standing still for 2-4 h, separating, washing and drying so as to obtain the invented product ferrous oxalate.

Description

1. Technical field [0001] The present invention relates to a kind of preparation method of known fine chemicals, specifically a kind of production method of ferrous oxalate special for lithium (ferrous) phosphate. 2. Background technology [0002] Ferrous oxalate, whose chemical name is ferrous oxalate (fouerr oxalate), is currently one of the main raw materials for the preparation of a new type of lithium battery cathode material - lithium (ferrous) phosphate. [0003] The known preparation method of ferrous oxalate is exactly that ferrous sulfate is added in the oxalic acid solution and reacts, and the ferrous oxalate of generation precipitates out, promptly packs factory after separating, washing and drying. The yield of this method is only about 80%, and the product purity is 98-99%. [0004] Ferrous oxalate prepared by known methods cannot meet the requirements of new lithium battery cathode materials, not only the purity is not enough, the particle size is large (35 ~...

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): C07C55/07C07C51/41
Inventor 李传友
Owner HEFEI ASIALON CHEM
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