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Method for preparing superfine alpha Fe203

A concentration and seed crystal technology, applied in the direction of iron oxide/iron hydroxide, iron oxide, etc., to achieve good dispersion effect

Inactive Publication Date: 2007-10-10
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the first two processes, the mixed acid method can be said to be cheap and good, but the mixed acid method using the nitric acid method seed crystal as the seed crystal is commonly used at present, which inevitably has the same pollution as the nitric acid method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add ferrihydrite seed crystals with a concentration of 0.02mol / L to the reaction kettle, adjust the pH value to 7, add the iron sheet on the surface to remove the rust layer and oxidize it through air, install a condensation device on the reaction kettle, heat up to 90°C, and continue the reaction for 6h. After the end, cool down to room temperature, filter, wash and dry to get the product α-Fe 2 o 3 6.55g, the particle size is about 50 nanometers.

Embodiment 2

[0014] Add δ-FeOOH seed crystals with a concentration of 0.02mol / L to the reaction kettle, adjust the pH value to 7, add the iron sheet on the surface to remove the rust layer and oxidize it through air, install a condensation device on the reaction kettle, heat up to 90°C, and continue the reaction for 10h , after the end of the reaction, it was lowered to room temperature, filtered, washed and dried to obtain the product α-Fe 2 o 3 7.52g, particle size 100nm.

Embodiment 3

[0016] Add amorphous γ-FeOOH seed crystals with a concentration of 0.02mol / L to the reaction kettle, adjust the pH value to 7, add the iron sheet on the surface to remove the rust layer and oxidize it through air, install a condensation device on the reaction kettle, and heat up to 90°C. The reaction was continued for 10 hours. After the reaction was completed, the temperature was lowered to room temperature, and after filtration, washing and drying, 8.1 g of the product was obtained, and the particle size of the product was 160 nanometers.

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Abstract

This invention provides a method for preparing ultrafine alpha-Fe2O3. The method comprises: adding Ferrihydrite, delta-FeOOH, and one of amorphous alpha-FeOOH and gamma-FeOOH as crystal seeds to Fe in a neutral condition, adding Fe (II) as the catalyst, introducing air, and oxidizing at 90 deg.C to obtain ultrafine alpha-Fe2O3 crystal with purity higher than 98%. The particle sizes of the product are adjustable, and the dispersion is good. The method has such advantages as simple process and no pollution, and is suitable for industrialization.

Description

technical field [0001] The invention relates to an ultrafine α-Fe 2 o 3 The preparation method belongs to the technical field of nanomaterial preparation. Background technique [0002] Superfine iron oxide red α-Fe 2 o 3 As an important class of oxides in new nanomaterials, due to its stable chemical properties and high catalytic activity, it has good light resistance, weather resistance and UV shielding properties. It has wide application value and prospects in fine ceramics, plastic products, coatings, catalysts, magnetic materials, medicine and bioengineering. At present, improving the dispersion of ultrafine iron oxide and improving its surface properties, as well as finding greener and more environmentally friendly preparation methods are the focus of research. Commonly used production methods in the prior art include sulfuric acid method, nitric acid method and mixed acid method. The sulfuric acid method is to use the ferrous sulfate solution to make the seed cry...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 魏雨周金明刘辉
Owner HEBEI NORMAL UNIV
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