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Sol method for preparing electronic-grade ferric phosphate

An electronic-grade phosphoric acid, sol method technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve the effect of fewer types of raw materials, a wide range of sources, and a simple process

Inactive Publication Date: 2013-12-25
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: aiming at the current research status of iron phosphate, the present invention provides a method for preparing electronic-grade iron phosphate by sol method that does not need ammonia water or other lye to control the pH value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Step 1: Measure 6mol L -1 Phosphoric acid solution 50ml, add FeCl 3 ·6H 2 O15g, heated at 60°C for 2h, condensed and recovered the volatile acid generated in the process;

[0018] Step 2: After the above solution is slightly cooled, add 100ml of ferric phosphate sol prepared from water solvent at 40°C, where the concentration of ferric phosphate is 1g·L -1 , stirred at constant temperature for 3 hours, the ferric phosphate sol causes the precipitation of iron phosphate in the solution, and then the precipitate is filtered, washed and dried, and the process of precipitation, filtration, precipitation and drying is carried out 2-3 times to prepare electronic grade ferric phosphate.

Embodiment 2

[0019] Embodiment 2: Step 1: Measure 6mol L -1 Phosphoric acid solution 50ml, add FeCl 3 ·6H 2 O15g, heated at 90°C for 2h, condensed and recovered the volatile acid generated in the process;

[0020] Step 2: After the above solution is slightly cooled, add 100ml of ferric phosphate sol prepared from ethanol solvent at 85°C, wherein the concentration of ferric phosphate is 0.8g L -1 , below with embodiment 1.

Embodiment 3

[0021] Embodiment 3: Step 1: Measure 4mol L -1 Phosphoric acid solution 50ml, add NaH 2 PO 4 12g and FeCl 3 ·6H 2 O15g, heated at 60°C for 1.5h, condensed and recovered the volatile acid generated in the process;

[0022] Step 2: Same as Example 1.

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PUM

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Abstract

The invention discloses a sol method for preparing electronic-grade ferric phosphate. The method comprises the steps of: preparing a mixed solution from a solution of one or more of phosphoric acid, monohydric phosphate or dihydric phosphate and a ferric salt at a molar ratio of P to Fe being (1:1)-(6:1), and stirring and heating at the temperature of 20-100 DEG C for 0.5-10 hours to form a buffer solution; then adding ferric phosphate sol to the buffer solution, thus changing the pH value and micro chemical environment of the system and promoting the separation of precipitate; and washing the precipitate, filtering and drying to prepare ultramicro fine powder ferric phosphate with D50 being 1-3 mu m. The method disclosed by the invention has the advantages that: the process is simple, the controllability of the process parameters is strong, the use raw materials are fewer, and the method is suitable for scaled industrial production; and ferric phosphate prepared by the method has low impurity content and uniform particle size distribution, and is suitable for being used for further preparing electronic-grade ferric phosphate lithium.

Description

technical field [0001] The invention relates to a method for preparing iron phosphate, in particular to a method for preparing electronic-grade iron phosphate by a sol method. Background technique [0002] Lithium iron phosphate has excellent properties such as high theoretical capacity (170mAh / g), high working voltage (voltage platform of about 3.5V), good cycle performance, no memory effect, etc., and has the advantages of low price and environmental friendliness, so it has the potential to replace Higher cost LiCoO 2 It will become a new generation of lithium-ion battery cathode material, and is expected to become an important material for large energy storage batteries required by electric vehicles. The solid-state reaction method is currently widely used in the production and research of lithium iron phosphate, and iron phosphate has gradually become an important precursor for the production of lithium iron phosphate in the carbothermal reduction method. In CN 1013376...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37
Inventor 肖仁贵曹建新罗西佳廖霞
Owner GUIZHOU UNIV
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