A manufacturing method of hexagonal ferrite powder, and a manufacturing method of a magnetic recording medium

Title:

A manufacturing method of hexagonal ferrite powder, and a manufacturing method of a magnetic recording medium

Document Type and Number:

Japanese Patent JP5972421

Kind Code:

B2

Abstract:

An aspect of the present invention relates to a method of manufacturing hexagonal ferrite powder, which comprises introducing a hexagonal ferrite precursor and an organic compound, either simultaneously or sequentially, into a feed passage into which water is being continuously fed while being heated and pressurized, continuously feeding a water-based solution comprising at least the hexagonal ferrite precursor, the organic compound, and water through the feed passage to a reaction flow passage within which a fluid flowing therein is subjected to heating and pressurizing to convert the hexagonal ferrite precursor into hexagonal ferrite in the reaction flow passage, discharging and feeding a water-based comprising the hexagonal ferrite from the reaction flow passage to a cooling element, and recovering the hexagonal ferrite from the water-based solution that has been cooled in the cooling element, wherein a solution temperature at the point of first contact between the hexagonal ferrite precursor and the organic compound is equal to or higher than 200° C. but lower than 300° C., and a pH of the water-based solution that has been cooled is equal to or higher than 6.0 but equal to or lower than 12.0.

Inventors:

Yoichi Hosoya

Application Number:

JP2015069164A

Publication Date:

August 17, 2016

Filing Date:

March 30, 2015

Export Citation:

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