METHOD FOR PRODUCING NICKEL MICROPARTICLES

摘要

The present invention addresses the problem of providing a method for producing nickel microparticles in which the ratio of crystallite's diameter to the particle diameter of the nickel microparticles is controlled. At least two types of fluids to be processed are used, including a nickel compound fluid in which a nickel compound is dissolved in a solvent, and a reducing agent fluid in which a reducing agent is dissolved in a solvent. Sulfate ions are included in the nickel compound fluid, and polyol is included in the nickel compound fluid and/or the reducing agent fluid. The fluid to be processed is mixed in a thin film fluid formed between at least two processing surfaces (1, 2), 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 nickel microparticles are precipitated. The present invention is characterized in that at this time, the ratio (d/D) of crystallite's diameter (d) to the particle diameter (D) of the nickel microparticle is controlled by controlling the pH of the nickel compound fluid introduced between the processing surfaces (1, 2) and the molar ratio of sulfate ions with respect to nickel in the nickel compound fluid.

主权项

1. A method for producing nickel microparticle, wherein
the method uses at least two fluids to be processed,of these, at least one fluid to be processed is a nickel compound fluid in which a nickel compound is dissolved in a solvent,
the nickel compound fluid contains a sulfate ion, at least one fluid to be processed other than the foregoing fluid to be processed is a reducing agent fluid in which a reducing agent is dissolved in a solvent, at least any one fluid to be processed of the nickel compound fluid and the reducing agent fluid contains a polyol, these fluids to be processed are mixed in a thin film fluid formed between at least two processing surfaces which are disposed in a position they are faced with each other so as to be able to approach to and separate from each other, at least one of which rotates relative to the other, whereby the nickel microparticle is separated, and pH of the nickel compound fluid which is introduced into between the at least two processing surfaces and also a molar ratio of the sulfate ion relative to the nickel contained in the nickel compound fluid are controlled, whereby controlling a ratio of d/D, a ratio of crystallite's diameter (d) of the nickel microparticle relative to a particle diameter (D) of the nickel microparticle.