Method for manufacturing metal microparticles

A technology of metal particles and manufacturing methods, applied in metal processing equipment, granulation in static tanks/troughs, granulation in rotating disks/pans, etc., can solve problems such as not being clear

Active Publication Date: 2015-03-11
M TECHN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The devices and methods described in these Patent Documents 10 and 11 are related to the development of the applicant of the present application, and they can contribute to the production of particles, especially nano-sized particles, and are highly evaluated. However, each The production of fine particles, the control of various characteristics such as the physical properties of the obtained fine particles, the current situation is that there are many parts that have not yet been clarified

Method used

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  • Method for manufacturing metal microparticles
  • Method for manufacturing metal microparticles
  • Method for manufacturing metal microparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0260] Examples are given below to describe the invention of the present application more specifically. However, the present invention is not limited to the following examples.

[0261] In the following examples, the so-called "from the center" is figure 1 The meaning of "from the first introduction part d1" in the processing device shown in , the first fluid refers to the above-mentioned first fluid to be processed introduced from the first introduction part d1, and the second fluid refers to the fluid from the first introduction part d1. figure 1 The above-mentioned second processed fluid introduced by the second introduction part d2 of the processing device shown in . In addition, as the opening d20 of the second introduction part d2, as figure 2 In (B), as shown by a dotted line, a concentric ring-shaped opening that wraps around the central opening of the processing surface 2 is used.

[0262] (A) Examples and comparative examples related to the production method of n...

Embodiment A1～A17

[0281] use figure 1The fluid treatment device shown in Table 3 mixed the nickel compound fluid with the formulation shown in Table 1 and the reducing agent fluid with the formulation shown in Table 2 under the treatment conditions in Table 3 to precipitate nickel particles. The obtained dry powder of nickel fine particles was analyzed. The results are shown in Table 4. It should be noted that the supply pressure of the first fluid and the rotational speed of the processing unit 10 are as described above. In addition, the nickel microparticle dispersion liquid discharged from between the processing surfaces 1 and 2 showed alkalinity in all of Examples A1 to A17.

[0282] As for the nickel compound fluid, in Examples A1 to A14, nickel sulfate hexahydrate was dissolved in a mixed solvent in which ethylene glycol, polyethylene glycol 600, and pure water were mixed. In order to change the pH and the sulfate ion concentration And add sulfuric acid, ammonium sulfate, potassium sul...

Embodiment A18～A23

[0297] Except that the recipe of the nickel compound fluid is shown in Table 5, and the treatment conditions are shown in Table 6, it was implemented similarly to the case of Examples A1 to A17 to obtain dry powder of nickel fine particles. The results are shown in Table 7. In addition, in all of Examples A15 to A23, the nickel microparticle dispersion liquid discharged from between the processing surfaces 1 and 2 showed alkalinity.

[0298] [table 5]

[0299]

[0300] [Table 6]

[0301]

[0302] [Table 7]

[0303]

[0304] It can be confirmed from Table 7 that by controlling the molar ratio (SO 4 2- / Ni), to suppress the particle size of the precipitated nickel particles from increasing, and at the same time promote the increase of the crystallite diameter. In addition, it was confirmed that the increase in the particle size was suppressed along with the increase in the crystallite diameter. Therefore, it was confirmed that the ratio (d / D) of the crystallite di...

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Abstract

Provided is a method for manufacturing metal microparticles in which the ratio of crystallite diameter to the particle diameter of the metal microparticles is controlled. At least two types of process fluid are used, including a metal fluid in which a metal or a metal compound is dissolved in a solvent, and a reducing agent fluid which includes a reducing agent. Sulfate ions are included in one or both of the metal fluid and the reducing agent fluid. The process fluid is mixed in a fluid thin film formed between at least two processing surfaces, at least one of which rotates relative to the other, and which are disposed facing each other and capable of approaching and separating from each other, and metal microparticles are precipitated. The present invention is characterized in that at this time, the ratio (d/D) of the crystallite diameter (d) of the metal microparticles to the particle diameter (D) of the metal microparticles is controlled by controlling the mole ratio of metal and sulfate ions in the mixed process fluid.

Description

technical field [0001] The present invention relates to a method for producing metal fine particles. Background technique [0002] In recent years, in a wide range of fields such as catalysts, conductive materials, magnetic materials, materials that emit secondary electrons, light emitters, heat absorbers, energy storage, electrode materials, colorants, etc., metal particles are sought, and the use is controlled according to the purpose. Particle size and particle size distribution of metal particles. In addition, the physical properties of metal fine particles also change according to the diameter of the crystallite. For example, even for metal fine particles having the same particle size, the firing temperature can be lowered when the crystallite is small, and the size can be reduced when the crystallite is large. Shrinkage after heat treatment. Therefore, it is highly useful for establishing a technique for controlling the crystallite diameter of metal fine particles, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B01J2/14B22F1/00B22F1/052
CPCB22F9/24B22F1/0014B01J2/14B01J2/10B22F1/052C22B11/04C22B15/0089C22B23/0461
Inventor 前川昌辉榎村真一
Owner M TECHN
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