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Preparation method of alpha-Fe2O3 magnetic nano-powder material

A magnetic nanometer and powder material technology, applied in the direction of iron oxide/iron hydroxide, iron oxide, etc., can solve the problems of high condition control requirements, high product cost, long preparation cycle, etc., and achieves low equipment requirements and low cost. , the effect of high practical value

Inactive Publication Date: 2017-05-31
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In recent years, scientists have successfully developed many new types of nanoscale α-Fe 2 o 3 Powder methods and technologies mainly include gas phase method, solid phase method, hydrothermal method, microwave radiation method, electrochemical synthesis method, homogeneous precipitation method, gel-sol method, combustion synthesis method and liquid phase catalytic phase conversion method etc. These methods usually require relatively high condition control and long preparation period, especially the preparation of nano-powders by microwave and electrochemical methods, the control of process parameters is very strict, and the catalytic phase inversion method needs to find a suitable phase inversion catalyst, etc., these Operational requirements lead to high product costs and complicated processes

Method used

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  • Preparation method of alpha-Fe2O3 magnetic nano-powder material
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  • Preparation method of alpha-Fe2O3 magnetic nano-powder material

Examples

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Effect test

Embodiment 1

[0021] Example 1: α-Fe 2 o 3 Preparation of magnetic nanopowder materials

[0022] Prepare FeCl with a concentration of 0.8 mol / L 3 Solution, accurately transfer 50 mL to a 250 mL Erlenmeyer flask, according to urea and Fe 3+ Accurately weigh urea with a molar ratio of 10:1 and add it into a 250 mL Erlenmeyer flask, stir to dissolve, heat the solution to 85°C, and stir for 4 h. After centrifugation, the precipitate was washed 5 times with distilled water. After centrifugation, the precipitate was placed in a drying oven, and the precursor was obtained after drying. Grind the precursor, put it into a temperature-programmed resistance furnace for calcination at 600 °C for 4 h, and cool naturally to obtain α-Fe 2 o 3 Magnetic nano powder material.

[0023] figure 1 α-Fe prepared for this example 2 o 3 The panoramic view of the scanning electron microscope picture of the magnetic nano-powder material. From the panoramic view, it can be seen that the prepared iron oxide na...

Embodiment 2

[0027] Example 2: α-Fe 2 o 3 Preparation of magnetic nanopowder materials

[0028] Fe(NO 3 ) 3 Solution, accurately transfer 50 mL to a 250 mL Erlenmeyer flask, according to urea and Fe 3+ Accurately weigh urea with a molar ratio of 5:1 and add it into a 250 mL Erlenmeyer flask, stir to dissolve, raise the temperature of the solution to 90°C, and stir for 1 h. After centrifugation, the precipitate was washed 5 times with distilled water. After centrifugation, the precipitate was placed in a drying oven, and the precursor was obtained after drying. The precursor was ground, put into a temperature-programmed resistance furnace for calcination at 500 °C for 2 h, and cooled naturally to obtain α-Fe 2 o 3 Magnetic nano powder material, its saturation magnetization is 0.35 emu / g.

Embodiment 3

[0029] Example 3: α-Fe 2 o 3 Preparation of magnetic nanopowder materials

[0030] Prepare FeCl with a concentration of 0.5 mol / L 3 Solution, accurately transfer 50 mL to a 250 mL Erlenmeyer flask, according to urea and Fe 3+Accurately weigh urea with a molar ratio of 8:1 and add it into a 250 mL Erlenmeyer flask, stir to dissolve, raise the temperature of the solution to 98°C, and stir for 6 h. After centrifugation, the precipitate was washed 5 times with distilled water. After centrifugation, the precipitate was placed in a drying oven, and the precursor was obtained after drying. Grind the precursor, put it into a temperature-programmed resistance furnace for calcination at 700 °C for 3 h, and cool naturally to obtain α-Fe 2 o 3 Magnetic nano powder material, its saturation magnetization is 0.41 emu / g.

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Abstract

The invention belongs to the technical field of preparation of an inorganic non-metal magnetic nano-powder material and in particular relates to a preparation method of an alpha-Fe2O3 magnetic nano-powder material. The preparation method takes inorganic iron salt and urea as raw materials and comprises the following steps: dissolving Fe<3+> and the urea into water according to the mol ratio of no more than 5 to 1; controlling the concentration of the Fe<3+> to be 0.5mol / L to 3.0mol / L and stirring; raising the temperature to 85 DEG C to 98 DEG C and reacting; after reacting, centrifuging and separating; washing with distilled water and precipitating; drying sediment and grinding; putting the sediment into a program temprature controlling resistor furnace and calcining at 500 DEG C to 700 DEG C to obtain the alpha-Fe2O3 magnetic nano-powder material. The alpha-Fe2O3 magnetic nano-powder material is prepared by adopting the urea to uniformly disperse an iron source and carrying out urea decomposition reaction; the preparation method provided by the invention is simple in process, easy to operate, low in cost, low in equipment requirements and environmentally friendly; a product has uniform structure and shape and stable performances.

Description

technical field [0001] The present invention relates to a kind of α-Fe 2 o 3 The invention discloses a method for preparing magnetic nanometer powder materials, which belongs to the technical field of preparation of inorganic nonmetallic nanometer materials. Background technique [0002] Iron is one of the most common and widely used metal materials in production and life. Among them, iron oxide is the largest and most widely used inorganic pigment in the world after titanium dioxide. It is widely used in military affairs, building materials, catalysts, ceramics, and glass. , magnetic materials, papermaking, cosmetics and other chemical raw materials. Ferric oxide can be divided into α-Fe according to different crystal forms 2 o 3 , β-Fe 2 o 3 and γ-Fe 2 o 3 , where α-Fe 2 o 3 It is a brick red solid powder and is one of the most stable iron oxides at room temperature. It has the characteristics of strong corrosion resistance, good weather resistance, low toxicity,...

Claims

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Application Information

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IPC IPC(8): C01G49/06
CPCC01G49/06C01P2002/72C01P2004/03C01P2004/62C01P2006/42
Inventor 刘瑞江陆荣柱陈健陆益民虞乐群吴晓阳于宗良邓志勇
Owner JIANGSU UNIV
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