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Method for preparing spherical iron phosphate grains

A technology of iron phosphate and iron phosphate balls, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of large consumption of phosphoric acid and sodium hydroxide, harsh production equipment requirements, and high production costs, and achieve composition control. Easy, low product cost, simple equipment effect

Active Publication Date: 2012-03-21
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the production equipment is harsh and the pollution is serious
Another method is to acidify ferrous sulfate with phosphoric acid and react with sodium chlorate to produce ferric dihydrogen phosphate solution, then adjust the pH value to about 2 with sodium hydroxide, and then precipitate iron phosphate. The disadvantage of this method is that phosphoric acid and The consumption of sodium hydroxide is large and the production cost is very high

Method used

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  • Method for preparing spherical iron phosphate grains
  • Method for preparing spherical iron phosphate grains
  • Method for preparing spherical iron phosphate grains

Examples

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Effect test

Embodiment 1

[0014] The preparation method of spherical iron phosphate particles is to mix 25ml ferric chloride solution (0.3mol / L) solution and 25ml sodium dihydrogen phosphate (0.15mol / L) solution evenly, and then pour it into a 60ml polytetrafluoroethylene bushing , put the sealed polytetrafluoroethylene liner into a hydrothermal kettle at 200°C for 12 hours, cool to room temperature, filter, and dry to obtain uniform iron phosphate balls with a particle size of about 2 μm. figure 1 It is a scanning electron micrograph and an XRD diffraction curve figure of the prepared iron phosphate.

Embodiment 2

[0016] The preparation method of spherical ferric phosphate particles is to uniformly mix 25ml ferric nitrate solution (0.15mol / L) solution and 25ml sodium dihydrogen phosphate (0.15mol / L) solution, and then pour it into a 60ml polytetrafluoroethylene bushing. Put the sealed polytetrafluoroethylene liner into a hydrothermal kettle at 200°C for 15 hours, cool to room temperature, filter, and dry to obtain uniform iron phosphate balls with a particle size of about 2.5 μm. figure 2 It is a scanning electron micrograph and an XRD diffraction curve figure of the prepared iron phosphate.

Embodiment 3

[0018] The preparation method of spherical iron phosphate particles is to mix 25ml ferric chloride solution (0.45mol / L) solution and 25ml sodium ammonium hydrogen phosphate (0.3mol / L) solution evenly, and then pour it into a 60ml polytetrafluoroethylene bushing , put the sealed polytetrafluoroethylene liner into a hydrothermal kettle at 220°C for 20 hours, cool to room temperature, filter, and dry to obtain uniform iron phosphate balls with a particle size of about 1 μm. image 3 It is a scanning electron micrograph and a map of constituent elements of the obtained ferric phosphate.

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Abstract

The invention discloses a method for preparing spherical iron phosphate grains, which comprises the following steps of: 1) preparing reactants; 2) mixing; 3) preserving heat; and 4) drying. In the method, composition control is easy, the reaction is carried out at the temperature of between 150 and 250 DEG C for 10 to 30 hours by a hydrothermal process, and spherical iron phosphate with uniform granularity can be synthesized; the used raw materials are common chemical raw materials; the reaction is carried out in a water phase; and the method has the advantages of simple required equipment, low energy consumption, low product cost, high yield and easy industrial production.

Description

technical field [0001] The invention belongs to the preparation technology of iron phosphate materials, and in particular relates to a preparation method of spherical iron phosphate particles. technical background [0002] Ferric phosphate is a widely used chemical raw material, which can be used as a food thickener and iron supplement, and can also be used in pigments, ceramics and metal glazes. In recent years, due to its high theoretical capacity, high working voltage, appropriate mass density, small self-discharge, long cycle life, no memory effect, low price, good thermal stability, and environmental friendliness, lithium iron phosphate is expected to replace the cost higher LiCoO 2 Become a new generation of lithium-ion battery cathode material. At present, the solid-state reaction method is the main method for the synthesis of lithium iron phosphate materials, and iron phosphate, as the main raw material for the synthesis of lithium iron phosphate, has important mar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37
Inventor 丁建民宋浩杰沈湘黔
Owner JIANGSU LENENG BATTERY INC