Method for preparing iron phosphate from ferrophosphorus

A technology of ferric phosphate and ferrophosphorus, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of no reports and patents of preparation methods, no discovery of ferric phosphate, etc., and meet low equipment requirements and production The effect of short process and easy operation and control

Inactive Publication Date: 2010-03-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] So far, no reports and patents have been found on the preparation of ferric phosphate by

Method used

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  • Method for preparing iron phosphate from ferrophosphorus
  • Method for preparing iron phosphate from ferrophosphorus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare ferric phosphate from ferrophosphorus FeP by solid-phase method. Firstly, ferrophosphorus powder is crushed to a certain particle size, then 5g of ferrophosphorus powder is dried at 200°C, and then roasted in a dry air atmosphere at 500°C for 10 hours. Generated P 2 o 5 gas into Fe 2 o 3 In, after reacting for 10 hours, iron phosphate finished product is obtained, and the reaction equation is as follows:

[0023] 2FeP+4O 2 → Fe 2 o 3 +P 2 o 5

[0024] Fe 2 o 3 +P 2 o 5 →2FePO 4

[0025] In this reaction, the molar ratio of phosphorus and iron in the raw material ferrophosphorus is 1:1, and there is no need to supplement phosphorus or iron sources. It is only necessary to fully react in dry air after drying the ferrophosphorus powder. Adding other reaction raw materials, there is no serious high-temperature corrosion problem caused by phosphoric acid, the intermediate product of the first oxidation reaction can be completely reacted to form iron ph...

Embodiment 2

[0027] Ferrophosphorus Fe was prepared by atomization drying method 1.5 P prepares iron phosphate, selects P 2 o 5 In order to supplement the phosphorus source, add it before roasting, the molar ratio of the two is 4:1, first crush the ferrophosphorus to a certain particle size, then mix the ferrophosphorus powder with the added P 2 o 5 After the powder is atomized and dried, it is fired in a dry air atmosphere at 600°C for 7 hours, and the generated P 2 o 5 gas into Fe 2 o 3 In, after 12 hours of reaction, ferric phosphate finished product is obtained, and the technological process is as follows figure 1 As shown, the reaction equation is as follows:

[0028] 8Fe 1.5 P+19O 2 +2P 2 o 5 →6Fe 2 o 3 +6P 2 o 5

[0029] 6Fe 2 o 3 +6P 2 o 5 →12FePO 4

[0030] The reaction requires only the addition of P 2 o 5 As a supplementary phosphorus source, the molar ratio of total phosphorus and total iron in the reaction raw materials was adjusted to 1:1, and no other...

Embodiment 3

[0032] Ferrophosphorus FeP 3 Prepare ferric phosphate as raw material, use ferrophosphorus powder as phosphorus source and iron source, use Fe 3 o 4 In order to supplement the iron source, it is added before roasting, the molar ratio of the two is 3:2, and the ferrophosphorus powder and the supplementary iron source Fe 3 o 4 After mixing, it is ball milled at a speed of 300-600rpm in an oxygenated dry ball mill tank for 10 hours, and then roasted in the air at 700°C for 5 hours, using supplementary iron source, oxygen and oxygen in the air as iron phosphate. source of oxygen to produce FePO 4 Finished product, process such as figure 1 As shown, the reaction equation is as follows:

[0033] 3FeP 3 +2Fe 3 o 4 +14O 2 →9FePO 4

[0034] No other by-products are generated during the reaction, and the morphology and particle size distribution of the product can be controlled as required. The process is relatively simple, no other impurities are introduced, and it also has ...

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Abstract

The invention relates to a method for preparing iron phosphate from ferrophosphorus. The ferrophosphorus is used as a part or the whole of a phosphorus source and an iron source for preparing the ironphosphate. The phosphorus source or the iron source is supplemented according to a mol ratio of (0.8-1.2):1.0 between total phosphorus elements and total iron elements. The ferrophosphorus is roastedin a dry and oxygen-containing atmosphere. The iron phosphate product is obtained by means of dry or wet oxidation product reaction. The method adopts the ferrophosphorus as the raw material for preparing the iron phosphate, makes full use of elements in the ferrophosphorus and creates a novel preparing process of iron phosphate. In addition, as the reaction process can be used for weakening or eliminating the influence of impurity elements in the ferrophosphorus on the iron phosphate product, the method indirectly purifies the ferrophosphorus and eliminates the influence of the impurities inthe ferrophosphorus and the problem of severe corrosion caused by the existence of water during the roasting of ferrophosphorus. The reaction process has relatively low demand on apparatuses. The preparing method has simple process, short production flow and low production cost, is clean and environment-friendly, realizes high resource utilization rate, low investment and good benefit and is suitable for large-scale, industrial, low-cost and clean preparation of iron phosphate.

Description

technical field [0001] The invention belongs to the technical field of material manufacturing technology, in particular to a method for preparing iron phosphate from iron phosphorus. Background technique [0002] FePO 4 It is a phosphate of iron, and it is widely used in energy materials, catalysts, ceramics and other fields. In the field of energy materials, due to the content of Fe 3+ and PO 4 3- , FePO 4 It can be used as an electrode material by itself. Different crystal forms and preparation methods will produce greatly different electrochemical properties. Amorphous FePO 4 The working voltage is 3V [J Mater Chem, 2002, 12 (6): 1870.], also can be used as preparation LiFePO 4 、LiFeP 2 o 7 and Li 3 Fe 2 (PO 4 ) 3 raw materials for electrode materials. Since Fe and P have been evenly mixed, it only needs Li+ to diffuse into it. Theoretically speaking, FePO 4 It is easier to control the preparation of electrode materials, so iron phosphate is widely used as i...

Claims

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Application Information

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IPC IPC(8): C01B25/37
Inventor 王贵欣闫康平
Owner SICHUAN UNIV
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