KR840005366A - Method for producing needle-shaped ferromagnetic alloy particles - Google Patents

Abstract

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Description

Method for producing needle-shaped ferromagnetic alloy particles

As this is a public information case, the full text was not included.

1 is a graph showing the relationship between the specific surface area of acicular ferromagnetic alloy particles and the applied water-soluble chromium salt,

2 is a graph showing the relationship between the coercive force (HC) of the needle-like ferromagnetic alloy particles and the applied water-soluble nickel salt,

3 is a graph showing the relationship between the antimagnetic force (HC) of the needle-like ferromagnetic alloy particles and the water-soluble magnesium salt applied.

Claims (12)

Α-oxidation doped with silicon, chromium and nickel, obtained by dehydrating acicular particles of α-iron (III) hydroxide doped with silicon, chromium and nickel or acicular particles of α-iron oxide hydroxide doped with silicon, chromium and nickel A method for producing needle-like ferromagnetic alloy particles doped with silicon, chromium and nickel by heating ferric needles of ferric iron under a reducing gas body. The α- doped with silicon, chromium and nickel by incorporating an oxygen-containing gas into an aqueous suspension containing ferrous hydroxide prepared by reacting an aqueous solution of ferrous salt with an aqueous alkali solution and having a pH of 11 or higher. A method of adding water-soluble silicates, water-soluble chromium salts and water-soluble nickel salts when forming acicular particles of iron (III) oxide hydroxide. The aqueous alkali solution of claim 2, wherein the aqueous solution of 0.1 to 1.7 atomic percent water based silicate, based on the amount of ferrous hydroxide in the suspension and calculated as the ratio of Si to Fe (II), is blown before the oxygen-containing gas. Or in an aqueous suspension. 3. A water-soluble chromium salt of 0.1 to 5.0 atomic percent, based on the amount of ferrous hydroxide in the suspension and calculated as the ratio of Ci to Fe (II), before blowing the oxygen-containing gas. Adding to an aqueous suspension of ferrous salts, an aqueous alkali solution, an aqueous suspension or to an aqueous suspension while blowing oxygen-containing gas. The water-soluble nickel salt of 0.1 to 7.0 atomic%, based on the amount of ferrous hydroxide in the suspension and calculated as the ratio of Ni to Fe (II), is prepared before blowing the oxygen-containing gas. A solution of ferrous salt, an aqueous alkali solution, a method in which it is added into an aqueous suspension or an aqueous suspension while blowing an oxygen-containing gas. Dehydrated acicular particles of α-iron (III) hydroxide doped with silicon, chromium, nickel and magnesium, or α-ferrous oxide acicular particles doped with silicon, chromium, nickel and magnesium or silicon, chromium, nickel and magnesium A method for producing needle-like ferromagnetic alloy particles doped with silicon, chromium, nickel and magnesium by heating needle-shaped particles of doped α-iron (III) hydroxide to 300-500 ° C. under a reducing gas body. 7. The α-doped ferrous hydroxide prepared by reacting an aqueous ferric salt solution with an aqueous alkaline solution contains doped with silicon, chromium, nickel and magnesium by blowing oxygen-containing gas into an aqueous suspension having a pH of 11 or higher. A method of adding water-soluble silicate water-soluble chromium salts, water-soluble nickel salts and water-soluble magnesium salts when forming needle particles of iron (III) hydroxide. The aqueous alkali solution of claim 7 before injecting the oxygen-containing gas with an oxygen-containing gas of 0.1 to 1.7 atomic% based on the amount of ferrous hydroxide in the suspension and calculated as the ratio of Si to Fe (II). Or adding to an aqueous suspension. A water-soluble chromium salt of 0.1 to 5.0 atomic percent, based on the amount of ferrous hydroxide in the suspension and calculated as the ratio of Cr to Fe (II), before blowing the oxygen-containing gas. A method of adding to an aqueous suspension of ferrous salt, an aqueous alkali solution, an aqueous suspension or to an aqueous suspension while blowing an oxygen-containing gas. 8. A method according to claim 7, wherein the water-soluble nickel salt of 0.1 to 7.0 atomic percent, based on the amount of ferrous hydroxide hydroxide and calculated as the ratio of Ni to Fe (II), is introduced before blowing the oxygen-containing gas. Aqueous solution of iron salts Alkali aqueous solution, a method of adding to an aqueous suspension or to an aqueous suspension while blowing an oxygen-containing gas. 8. The method of claim 7, wherein the water-soluble magnesium in an amount of 0.1 to 15.0 atomic percent, based on the amount of ferrous hydroxide in the suspension and calculated as the ratio of Mg to Fe (III), is introduced prior to blowing the oxygen-containing gas. Adding to aqueous solutions of iron salts, aqueous alkali solutions, aqueous suspensions or to aqueous suspensions while blowing oxygen-containing gases. ※ Note: The disclosure is based on the initial application.