A method of manufacturing a powder, by which it is possible to adjust the
strength of the obtained powder is provided. The manufacturing method of
a powder involves a step of preparing a slurry containing agglomerated
particles of a synthetic material which is produced by reacting a first
material and a second material under agitation, and a step of drying the
slurry to obtain a powder of the synthetic material. The method has a
feature that the particle size of the agglomerated particles is adjusted
by, in the step of preparing a slurry, controlling agitation power for
agitating the slurry. In the step of preparing a slurry, it is preferable
that the slurry is initially agitated at a first agitation power, and at
the time when the viscosity of the slurry approaches its maximum value,
or at the time when the pH value of the slurry reaches the vicinity of
the isoelectric point of the synthetic material, the agitation power is
lowered from the first agitation power to a second agitation power.
Further, it is preferable that before or after the completion of the
reaction of the first material and the second material, the agitation
power is increased from the second agitation power to a third agitation
power.