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Preparation method of spherical porous iron oxide as well as product and application of spherical porous iron oxide

An iron oxide, spherical technology, applied in the manufacture of iron oxide, iron oxide/iron hydroxide, inductor/transformer/magnet, etc., can solve the problems of improving the structure of iron oxide, improve electromagnetic performance, simple preparation process and low cost Effect

Pending Publication Date: 2022-03-01
HUNAN SPECIAL METAL MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The focus of the above comparative documents is on the control of magazine content, and the structure of iron oxide has not been improved

Method used

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  • Preparation method of spherical porous iron oxide as well as product and application of spherical porous iron oxide
  • Preparation method of spherical porous iron oxide as well as product and application of spherical porous iron oxide
  • Preparation method of spherical porous iron oxide as well as product and application of spherical porous iron oxide

Examples

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preparation example Construction

[0047] A preparation method of spherical porous iron oxide, comprising the following steps:

[0048] 1. Preparation of spherical iron oxide seed crystals

[0049] (1) Take the soluble iron salt of ferrous iron, and use pure water or deionized water to prepare an iron salt solution containing ferrous ions, and the concentration of ferrous ions is preferably controlled at 0.01~20g / L; The soluble ferrous salt preferably includes at least one of ferrous sulfate, ferrous nitrate and ferrous chloride, or a mixed solution of the three in any proportion.

[0050] (2) Take surfactant A and add it to the iron salt solution of step (1). The concentration of surfactant A is preferably controlled at 0.05~15g / L. Surfactant A includes thiourea, polyacrylamide , Tween, ethanol, ethylene glycol, isopropanol, n-butanol, EDTA, disodium EDTA, tetrasodium EDTA, polyvinyl alcohol at least one. If the ferrous salt solution contains impurities, it is necessary to remove impurities from the ferrous ...

Embodiment 1

[0063] 1. Preparation of spherical iron oxide seeds

[0064] Use pure water to prepare 10L of ferrous sulfate solution with ferrous ion concentration of 5g / L, then weigh 10g of thiourea and add it to the ferrous sulfate solution and stir thoroughly; prepare 8L of 1mol / L sodium hydroxide solution with pure water , the prepared sodium hydroxide solution is slowly added to the ferrous sulfate solution, and the pH value is controlled to be 6; at the same time, air is introduced to oxidize the solution, and the amount of introduction is theoretically when ferrous iron is oxidized to ferric iron. Twice the amount of oxidant is required; heat the oxidized solution to 75°C, add 1L of ferrous sulfate solution with a ferrous iron content of 20g / L, fully stir, and keep warm for 1 hour to obtain spherical iron oxide seeds.

[0065] 2. Preparation of spherical porous iron oxide

[0066] Heat the above-mentioned spherical iron oxide seed crystal solution to 85°C; prepare 10L of a ferrous s...

Embodiment 2

[0069] 1. Preparation of spherical iron oxide seeds

[0070] Prepare 10L of ferrous sulfate solution with a ferrous ion concentration of 10g / L with pure water, then weigh 10g of EDTA and add it to the ferrous sulfate solution and fully stir; prepare 8L of 1mol / L sodium hydroxide solution with pure water, The prepared sodium hydroxide solution is slowly added to the ferrous sulfate solution, and the pH value is controlled at 4; at the same time, air is introduced to oxidize the solution, and the amount of introduction is theoretically required when ferrous iron is oxidized to ferric iron. 3 times the amount of oxidant; heat the oxidized solution to 80°C, add 1L of ferrous sulfate solution with a ferrous iron content of 30g / L, fully stir, and keep warm for 1h to obtain spherical iron oxide seeds.

[0071] 2. Preparation of spherical porous iron oxide

[0072] Heat the above-mentioned spherical iron oxide seed crystal solution to 90°C; use pure water to prepare 10L of ferrous su...

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Abstract

The invention discloses a preparation method of spherical porous iron oxide as well as a product and application of the spherical porous iron oxide, the spherical porous iron oxide prepared by the method of firstly preparing a spherical iron oxide seed crystal solution and then preparing the spherical porous iron oxide by using the spherical iron oxide seed crystal solution has the D50 of 0.6-2 mu m, the specific surface area of 4-20 m < 2 > / g and the apparent density of 0.4-1.2 g / cm < 3 >. The microstructure of the iron oxide is optimized, the prepared spherical porous iron oxide is high in apparent density and excellent in quality and can be used for preparing high-performance soft magnetic ferrite, meanwhile, the preparation method of the spherical porous iron oxide is simple in process and can be used for large-scale production, the synthesis process is a liquid phase precipitation reaction in a wet process, and the yield is high. The impurity content of the product can be effectively controlled by controlling the impurity level of the reaction raw materials.

Description

technical field [0001] The invention belongs to the technical field of iron oxide preparation, and in particular relates to a preparation method of spherical porous iron oxide and its product and application. Background technique [0002] High-performance soft ferrite materials are still the largest and most widely used soft ferrite materials, and the most promising ones are high-frequency low-power ferrite materials and high-permeability ferrite materials. The output of the two materials has accounted for more than 60% of the total soft ferrite, of which iron oxide, the main raw material, accounts for about 70%. [0003] For a long time, iron oxide prepared by spray roasting of pickling waste liquid in steel mills has become the main source of soft ferrite materials. With the strengthening of environmental protection, the pickling process of steel mills with serious environmental pollution is gradually replaced by acid-free washing technology, and the output of this type o...

Claims

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Application Information

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IPC IPC(8): C01G49/06H01F1/34H01F41/02
CPCC01G49/06H01F41/02H01F1/344C01P2002/72C01P2006/12C01P2004/62C01P2004/03C01P2004/61C01P2004/32C01P2006/42
Inventor 木宗云毛耀清许定胜银瑰江权冯树兵黄文杰
Owner HUNAN SPECIAL METAL MATERIALS CO LTD
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