Process for producing nickel powder

Patent metadata

Field	Value
Publication number	US-2018304375-A1
Application number	US-201615769521-A
Country	US
Kind code	A1
Filing date	Oct 14, 2016
Priority date	Oct 19, 2015
Publication date	Oct 25, 2018
Grant date	—

Abstract

A process for producing nickel powder capable of obtaining inexpensive, and also, high-performance nickel powder, even when using wet process. A process for producing nickel powder, including a crystallization step for obtaining nickel crystal powder by reductive reaction in reaction solution in which at least water-soluble nickel salt, metal salt of metal more noble than nickel, reducing agent, alkali hydroxide, amine compound, and water are mixed, wherein the reducing agent to be mixed in the crystallization step is hydrazine, the amine compound is autolysis inhibitor of hydrazine, and contains two or more primary amino groups in molecule, or contains one primary amino group and one or more secondary amino groups in molecule, and ratio of molar number of the amine compound with respect to molar number of nickel in the reaction solution is in a range of 0.01 mol % to 5 mol %.

First claim

1 . A process for producing nickel powder, comprising a crystallization step for obtaining nickel crystal powder by reductive reaction in reaction solution in which at least water-soluble nickel salt, metal salt of metal more noble than nickel, reducing agent, alkali hydroxide, amine compound, and water are mixed,
wherein the reducing agent to be mixed in the crystallization step is hydrazine (N 2 H 4 ), the amine compound is autolysis inhibitor of hydrazine, and contains two or more primary amino groups (—NH 2 ) in molecule, or contains one primary amino group (—NH 2 ) and one or more secondary amino groups (—NH—) in molecule, and ratio of molar number of the amine compound with respect to molar number of nickel in the reaction solution is in a range of 0.01 mol % to 5 mol %.

2 . The process for producing nickel powder according to claim 1 , wherein the amine compound is at least any of alkylene amine or alkylene amine derivative.

3 . The process for producing nickel powder according to claim 2 , wherein the alkylene amine or the alkylene amine derivative is at least having a structure of following formula A, in which nitrogen atoms of amino group in molecule are bonded via carbon chain with two carbons.

4 . The process for producing nickel powder according to claim 3 , wherein the alkylene amine is one or more selected from ethylene diamine (H 2 NC 2 H 4 NH 2 ), diethylene triamine (H 2 NC 2 H 4 NHC 2 H 4 NH 2 ), triethylene tetramine (H 2 N(C 2 H 4 NH) 2 C 2 H 4 NH 2 ), tetraethylene pentamine (H 2 N(C 2 H 4 NH) 3 C 2 H 4 NH 2 ), pentaethylen hexamine (H 2 N(C 2 H 4 NH) 4 C 2 H 4 NH 2 ), propylene diamine (CH 3 CH(NH 2 )CH 2 NH 2 ), and the alkylene amine derivative is one or more selected from tris (2-aminoethyl) amine (N(C 2 H 4 NH 2 ) 3 ), N-(2-aminoethyl) ethanol amine (H 2 NC 2 H 4 NHC 2 H 4 OH), N-(2-aminoethyl) propanol amine (H 2 NC 2 H 4 NHC 3 H 6 OH), 2, 3-diaminopropionic acid (H 2 NCH 2 CH(NH)COOH), and 1, 2-cyclohexane diamine (H 2 NC 6 H 10 NH 2 ).

5 . The process for producing nickel powder according to claim 1 , wherein sulfide compound as autolysis inhibition adjuvant of the hydrazine is blended in the reaction solution, in addition to the amine compound,
the sulfide compound contains one or more sulfide group (—S—) in molecule, and ratio of molar number of the sulfide compound with respect to molar number of the nickel in the reaction solution is in a range of 0.01 mol % to 5 mol %.

6 . The process for producing nickel powder according to claim 5 , wherein the sulfide compound is carboxy group-containing sulfide compound or hydroxyl group-containing sulfide compound further containing at least one or more carboxy group (—COOH) or hydroxyl group (—OH) in molecule.

7 . The process for producing nickel powder according to claim 6 , wherein the carboxy group-containing sulfide compound or the hydroxyl group-containing sulfide compound is one or more selected from methionine (CH 3 SC 2 H 4 CH(NH 2 )COOH), ethionine (C 2 HsSC 2 H 4 CH(NH 2 )COOH), thiodipropionic acid (HOOCC 2 H 4 SC 2 H 4 COOH), thiodiglycolic acid (HOOCCH 2 SCH 2 COOH), and thiodiglycol (HOC 2 HsSC 2 HsOH).

8 . The process for producing nickel powder according to claim 1 , wherein ratio of used amount of molar number of the hydrazine with respect to molar number of the nickel is less than 2.0, in the crystallization step.

9 . The process for producing nickel powder according to claim 1 , wherein ratio of used amount of molar number of the hydrazine with respect to molar number of the nickel is less than 1.3, in the crystallization step.

10 . The process for producing nickel powder according to claim 1 , wherein the water-soluble nickel salt is one or more selected from nickel chloride (NiCl 2 ), nickel sulfate (NiSO 4 ), and nickel nitrate (Ni(NO 3 ) 2 ).

11 . The process for producing nickel powder according to claim 1 , wherein the metal salt of metal more noble than nickel is one or more selected from copper salt, gold salt, silver salt, platinum salts, palladium salt, rhodium salt, and iridium salt.

12 . The process for producing nickel powder according to claim 1 , wherein the alkali hydroxide is one or more selected from sodium hydroxide (NaOH) and potassium hydroxide (KOH).

13 . The process for producing nickel powder according to claim 1 , wherein in the crystallization step, nickel salt solution in which at least the water soluble nickel salt and the metal salt of metal more noble than nickel are dissolved in water, and reducing agent solution containing at least the reducing agent, the alkali hydroxide and water, are prepared, and after adding the amine compound as autolysis inhibitor of hydrazine to at least one of the nickel salt solution and the reducing agent solution, and further, after adding the sulfide compound as autolysis inhibition adjuvant of hydrazine to at least one of the nickel salt solution and the reducing agent solution according to need, the nickel salt solution is added and mixed to the reducing agent solution, or vice versa, the reducing agent solution is added and mixed to the nickel salt solution.

14 . The process for producing nickel powder according to claim 1 , wherein in the crystallization step, nickel salt solution in which at least the water soluble nickel salt and the metal salt of metal more noble than nickel are dissolved in water, and reducing agent solution containing at least the reducing agent, the alkali hydroxide and water, are prepared, and after adding and mixing the nickel salt solution to the reducing agent solution, or vice versa, after adding and mixing the reducing agent solution to the nickel salt solution, the amine compound as autolysis inhibitor of hydrazine is added and mixed, and further, the sulfide compound as autolysis inhibition adjuvant of hydrazine is added and mixed according to need.

15 . The process for producing nickel powder according to claim 1 , wherein in the crystallization step, nickel salt solution in which at least the water soluble nickel salt and the metal salt of metal more noble than nickel are dissolved in water, and reducing agent solution containing at least the reducing agent, the alkali hydroxide and water, are prepared, and after adding the sulfide compound as autolysis inhibition adjuvant of hydrazine to at least one of the nickel salt solution and the reducing agent solution according to need, the nickel salt solution is added and mixed to the reducing agent solution, or vice versa, the reducing agent solution is added and mixed to the nickel salt solution, and then, the amine compound as autolysis inhibitor of hydrazine is added and mixed.

16 . The process for producing nickel powder according to claim 1 , wherein in the crystallization step, nickel salt solution in which at least the water soluble nickel salt and the metal salt of metal more noble than nickel are dissolved in water, reducing agent solution containing at least the reducing agent and water, and alkali hydroxide solution containing at least the alkali hydroxide and water, are prepared, and after adding the amine compound as autolysis inhibitor of hydrazine to at least one of the nickel salt solution, the reducing agent solution and the alkali hydroxide solution, and further, after adding the sulfide compound as autolysis inhibition adjuvant of hydrazine to at least one of the nickel salt solution, the reducing agent solution and the alkali hydroxide solution according to need, the nickel salt solution and the reducing agent solution are mixed to obtain nic

Assignees

• Sumitomo Metal Mining Co

Inventors

• Ishii Junji
• Tanaka Hiroyuki
• Murakami Shingo
• Kumagai Yuki
• Yukinobu Masaya
• Matsumura Yoshiaki

Classifications

• B22F1/145

  Chemical treatment, e.g. passivation or decarburisation · CPC title

• B22F1/052

  characterised by a mixture of particles of different sizes or by the particle size distribution · CPC title

• B22F9/24 Primary

  starting from liquid metal compounds, e.g. solutions · CPC title

• B22F2304/058

  Particle size above 300 nm up to 1 micrometer · CPC title

• C22C19/03

  based on nickel · CPC title