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A kind of preparation method of non-agglomerated submicron nickel ferrite magnetic carrier

A magnetic carrier, nickel ferrite technology, applied in catalyst carrier, chemical instrument and method, metal/metal oxide/metal hydroxide catalyst, etc., can solve limited coating amount, long boiling reflux time, poor dispersion, etc. problems, to achieve the effect of simple and controllable preparation process, easy large-scale production, and good dispersion

Active Publication Date: 2012-02-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

Two key issues to be solved are: ①The particle size of the magnetic material should be moderate. After the nano-scale powder is coated with oxide, the magnetism is obviously weakened, and it is difficult to achieve the effect of magnetic recovery. The coarse powder above the micron level still has light shading , the impact of light absorption; ②The preparation method of the carrier needs to be improved. At present, the methods for preparing nickel ferrite and cobalt ferrite include oxalate precipitation method, sol-gel method, high-temperature hydrothermal stripping method, alkali boiling method, etc., the first two The latter requires calcination and ball milling process, and the dispersibility is poor. The high-temperature hydrothermal stripping method requires high-temperature and high-pressure equipment, generally above 200°C, and the reaction process requires a large amount of organic phase. The alkaline boiling method requires a long boiling reflux time. often incomplete
The method of coating alumina or silica is basically a sol-gel method, the coating amount is limited, and it is not easy to obtain a composite powder with good dispersibility

Method used

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  • A kind of preparation method of non-agglomerated submicron nickel ferrite magnetic carrier
  • A kind of preparation method of non-agglomerated submicron nickel ferrite magnetic carrier
  • A kind of preparation method of non-agglomerated submicron nickel ferrite magnetic carrier

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preparation example Construction

[0016] A method for preparing a non-agglomerated submicron nickel ferrite magnetic carrier, the steps of the preparation process comprising:

[0017] (1) Preparation of submicron nickel ferrite: prepare 1 liter of nickel sulfate solution of 0.5 mol / liter and 1 liter of ferrous sulfate solution of 1 mol / liter, and mix well, pour into it with mechanical stirring rapidly, and the concentration is 7 moles / liter, a volume of 2 liters of sodium hydroxide solution, stirred rapidly for 30 minutes to form a colloidal precipitate. The jelly-like precipitate was poured into a 5L autoclave as a whole, and 0.5L of deionized water was added to make the total volume 4.5L. Heat and mechanically stir to 120-140°C, heat and hold pressure for 2-5 hours, then cool naturally to room temperature. The precipitate was taken out, washed with deionized water for more than 3 times, and a submicron nickel ferrite powder with good dispersibility was obtained. After washing, place in deionized water fo...

Embodiment 1

[0022] (1) Prepare 1 L of 0.5 mol / L nickel sulfate solution and 1 L of 1 mol / L ferrous sulfate solution, mix well, and quickly pour in hydrogen with mechanical stirring, concentration of 7 mol / L and volume of 2 liters In the sodium oxide solution, stir rapidly for 30 minutes to form a colloidal precipitate. The jelly-like precipitate was poured into a 5L autoclave as a whole, and 0.5L of deionized water was added to make the total volume 4.5L. Heat and mechanically stir to 120°C, heat and hold pressure for 5 hours, then cool to room temperature naturally. The precipitate was taken out, washed with deionized water for more than 3 times, and a submicron nickel ferrite powder with good dispersibility was obtained. After washing, place in deionized water for later use.

[0023] (2) Transfer the spare nickel ferrite above into a 5L glass beaker, and add water until the volume is 3 liters. Under mechanical stirring, 1 liter of aluminum ammonium sulfate solution with a concentrati...

Embodiment 2

[0026] (1) Prepare 1 liter of nickel sulfate solution of 0.5 mol / liter and 1 liter of ferrous sulfate solution of 1 mol / liter, and mix evenly, pour into the solution with mechanical stirring, concentration of 7 mol / liter and volume of 2 liters In the sodium hydroxide solution, stir rapidly for 30 minutes to form a colloidal precipitate. Pour the jelly-like precipitate into a 5-liter high-pressure reactor as a whole, and add 0.5 liter of deionized water to make the total volume 4.5 liters. Heat and mechanically stir to 140°C, heat and hold pressure for 2 hours, then cool to room temperature naturally. The precipitate was taken out, washed with deionized water for more than 3 times, and a submicron nickel ferrite powder with good dispersibility was obtained. After washing, place in deionized water for later use.

[0027] (2) Transfer the spare nickel ferrite above into a 5-liter glass beaker, and add water to a volume of 3 liters. Under mechanical stirring, pass 1 liter of am...

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Abstract

A method for preparing a non-agglomerated submicron nickel ferrite magnetic carrier, in particular to a method for preparing a non-agglomerated submicron nickel ferrite / alumina composite carrier. It is characterized in that the steps of its preparation process include: (1) preparing submicron nickel ferrite; (2) preparing a submicron nickel ferrite precursor coated with alumina; (3) roasting the submicron nickel ferrite precursor , to prepare non-agglomerated submicron nickel ferrite magnetic carrier. The carrier prepared by the method of the invention has good dispersibility, particle size of 0.3-0.5um, strong and soft magnetic properties, large and adjustable alumina wrapping amount and uniform distribution. The preparation process is simple, the cost is low, and the large-scale production is easy.

Description

technical field [0001] A method for preparing a non-agglomerated submicron nickel ferrite magnetic carrier, in particular to a method for preparing a non-agglomerated submicron nickel ferrite / alumina composite carrier. Background technique [0002] Magnetic-supported titanium dioxide photocatalyst has become a research hotspot in the field of photocatalysis because of its easy recovery and high activity. However, the magnetic-supported photocatalyst formed by using black magnetic materials such as nickel ferrite, cobalt ferrite, and ferroferric oxide as the carrier to support nano-titanium dioxide will affect the full play of the activity of titanium dioxide due to the light absorption and light-shielding properties of the magnetic material itself. The photocatalytic efficiency is low. By selecting a magnetic material with a certain particle size and coating its surface with a layer of inorganic oxide materials such as alumina and silicon oxide as a composite carrier, the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/755
Inventor 景茂祥李旺兴李东红姜雪芹王舟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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