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Process for production of iron oxyhydroxide particles

A technology of iron oxyhydroxide and a manufacturing method, applied in the directions of iron oxide/iron hydroxide, etc., can solve the problems of uneven iron oxyhydroxide particles, insufficient micronization, uneven particle size of iron oxyhydroxide particles, etc., and achieve a narrow particle size distribution. , the deviation of the size is small, and the particle shape is neat.

Inactive Publication Date: 2009-07-01
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the aforementioned JP-A-3-228829 discloses that it is difficult to stably obtain fine goethite using a stirred tank reactor or a bubble column reactor, and it is not a production method using a stirred tank reactor.
Therefore, since an oxidizing gas having an oxygen partial pressure of 0.2 atm or more is blown in without stirring, unevenness may occur in the obtained iron oxyhydroxide particles.
In addition, in the aforementioned Japanese Patent Laid-Open No. 10-182162, in the process of oxidizing ferrous hydroxide, since the oxidation rate is increased until it reaches a predetermined oxidation rate, the particle size of the iron oxyhydroxide particles may be uneven.
In addition, the major axis length of the obtained goethite is about 0.05 to 0.25 μm, so it is not sufficiently refined

Method used

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  • Process for production of iron oxyhydroxide particles
  • Process for production of iron oxyhydroxide particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Use ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) As the ferrous salt of iron raw material, ferric sulfate solution is made. Next, sodium bicarbonate (NaHCO 3 ). The addition amount of the neutralizing agent is 4 times equivalent with respect to iron raw material. Thereafter, sodium hydroxide (NaOH) was mixed to prepare an alkaline aqueous solution. At this time, when mixing the iron raw material solution and the neutralizer solution, the Fe concentration was adjusted so that it was 0.05 mol / L in the reaction solution. Use a microbubble generating device (manufactured by Zenken Co., Ltd., device name: Micro bubbler-Z) to generate microbubbles made of nitrogen gas, degas and mix them, and then add FeSO 4 The solution was neutralized and precipitated to obtain a suspension ((step (A)). In addition, the temperature was controlled so that the temperature of the liquid during neutralization and thereafter was stabilized at 17°C.

[0061] After mixing, the following pro...

Embodiment 2

[0064] In the step (B), the ferrous iron contained in the suspension was oxidized except that the oxygen component ratio was set to 0.10, the flow rate of the oxygen-containing gas was set to 12 L / min, and the bubble diameter was set to 150 μm, as in Example 1. to obtain iron oxyhydroxide particles. In addition, the amount of the reaction solution was 100 L.

[0065] The same measurement as in Example 1 was performed on the obtained iron oxyhydroxide particles. The results are shown in Table 1.

Embodiment 3

[0067] In the step (B), the ferrous iron contained in the suspension was oxidized except that the oxygen component ratio was set to 0.15, the flow rate of the oxygen-containing gas was set to 2 L / min, and the bubble diameter was set to 46 μm, as in Example 1. to obtain iron oxyhydroxide particles.

[0068] The same measurement as in Example 1 was performed on the obtained iron oxyhydroxide particles. The results are shown in Table 1.

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Abstract

The process for production of iron oxyhydroxide particles according to the invention is characterized by comprising a step (A) in which a suspension containing iron is prepared, and a step (B) in which fine bubbles with diameters of 0.05-500 mum are generated in the suspension to form a reaction mixture, and the iron in the reaction mixture is oxidized by the bubbles to produce iron oxyhydroxide particles.

Description

technical field [0001] The invention relates to a method for producing iron oxyhydroxide particles, which can be used for magnetic recording media, grinding tapes, ribbons, cosmetics, and finishing paints, especially as high-density and high-capacity magnetic recording tapes. Suitable for fillers in coatings for smoothing the surface of precursors and supports. Background technique [0002] In magnetic recording tapes, which are increasingly required to have a larger capacity and higher density, the recording wavelength decreases and the bit length or track width decreases as the recording density increases. That is, high density can be achieved by improving recording density and track density. However, as the bit length and track width become smaller, the number of magnetic bodies per bit decreases and the SN ratio decreases, so finer magnetic particles are required. Furthermore, if the particle size of the particles becomes uneven, the distribution state of the magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02
Inventor 河濑美香
Owner TDK CORPARATION
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