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A kind of preparation method of superfine ferric boride

A technology of iron boride and boric acid solution, applied in the direction of boron/boride, metal boride, etc., can solve the problems of large particle size, low activity and small BET of iron boride

Active Publication Date: 2021-07-06
蒋央芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the iron boride obtained by the conventional preparation method has a large particle size, a small BET, and low activity.

Method used

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  • A kind of preparation method of superfine ferric boride
  • A kind of preparation method of superfine ferric boride
  • A kind of preparation method of superfine ferric boride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of superfine ferric boride, it is the following steps:

[0037] (1) after ferrous gluconate solution and boric acid solution are mixed, spray drying, obtain spray-dried material, the mol ratio of ferrous gluconate solution and boric acid is 1:1.01;

[0038] (2) Sintering the spray-dried material in a methane atmosphere, the sintering time is 10h, and the sintering temperature is 1200°C to react to obtain the reduced material;

[0039] (3) continue to feed carbon dioxide into the reducing material, and react at a temperature of 700°C for 4 hours to obtain a sintered material;

[0040] (4) The sintered material is subjected to jet crushing, screening and vacuum packaging to obtain superfine iron boride.

[0041] The concentration of described step (1) ferrous gluconate solution is 1.5mol / L, and the concentration of boric acid solution is 1mol / L, and spray drying adopts centrifugal spray drier, and the rotating speed of centrifugal atomizing w...

Embodiment 2

[0049] A kind of preparation method of superfine ferric boride, it is the following steps:

[0050](1) after ferrous gluconate solution and boric acid solution are mixed, spray drying, obtain spray-dried material, the mol ratio of ferrous gluconate solution and boric acid is 1:1.02;

[0051] (2) Sintering the spray-dried material in a methane atmosphere, the sintering time is 10h, and the sintering temperature is 1200°C to react to obtain the reduced material;

[0052] (3) Continue to feed carbon dioxide into the reducing material, and react at a temperature of 850° C. for 2 hours to obtain a sintered material;

[0053] (4) The sintered material is subjected to jet crushing, screening and vacuum packaging to obtain superfine iron boride.

[0054] The concentration of described step (1) ferrous gluconate solution is 3mol / L, and the concentration of boric acid solution is 2mol / L, and spray drying adopts centrifugal spray drier, and the rotating speed of centrifugal atomization ...

Embodiment 3

[0062] A kind of preparation method of superfine ferric boride, it is the following steps:

[0063] (1) after ferrous gluconate solution and boric acid solution are mixed, spray drying, obtain spray-dried material, the mol ratio of ferrous gluconate solution and boric acid is 1:1.015;

[0064] (2) Sintering the spray-dried material in a methane atmosphere, the sintering time is 8h, and the sintering temperature is 1000°C to react to obtain the reduced material;

[0065] (3) Continue to feed carbon dioxide into the reducing material, and react at a temperature of 780° C. for 3 hours to obtain a sintered material;

[0066] (4) The sintered material is subjected to jet crushing, screening and vacuum packaging to obtain superfine iron boride.

[0067] The concentration of described step (1) ferrous gluconate solution is 2mol / L, and the concentration of boric acid solution is 1.2mol / L, and spray drying adopts centrifugal spray drier, and the rotating speed of centrifugal atomizati...

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Abstract

The invention discloses a preparation method of ultrafine iron boride. After ferrous gluconate solution and boric acid solution are mixed, spray drying, obtain spray-dried material, the mol ratio of ferrous gluconate solution and boric acid is 1:1.01-1.02; The spray-dried material is sintered in methane atmosphere, and the sintering time is 5‑10h, the sintering temperature is 800‑1200°C to react to obtain the reduced material; continue to pass the reduced material into carbon dioxide, and react at a temperature of 700‑850°C for 2‑4h to obtain the sintered material; the sintered material is crushed and sieved by airflow and vacuum packaging to obtain ultrafine ferric boride. The invention can prepare superfine iron boride with small particle size, large BET and high purity.

Description

technical field [0001] The invention relates to a method for preparing ultrafine iron boride, belonging to the technical field of powder preparation. Background technique [0002] Iron boride is a boride of iron with a chemical formula of FeB and a molecular weight of 66.66. Iron boride is a gray orthorhombic crystal with a melting point of 1652°C and a density of 7.15g / mL. The iron borides are arranged in a zigzag chain, with iron atoms at the corners of the triangular prism, and boron atoms at the center of the triangular prism, connected in the zigzag chain in the form of covalent bonds. The melting point of iron boride is 1652°C and the density is 7.15g / mL. It is soluble in dilute and concentrated nitric acid, concentrated and 1:1 hydrochloric acid solution, and 1:1 H 2 SO 4 and HClO 4 in, μ eff = 1.1 µB. It exists in α-form at low temperature and in β-form with the same Tc (602K) at high temperature. With the change of magnetic moment, it transforms from α to β. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04
CPCC01B35/04C01P2004/03C01P2004/61C01P2004/62C01P2006/11C01P2006/12C01P2006/80
Inventor 蒋央芳
Owner 蒋央芳
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