Flash drying apparatus and method of producing particles

A loop-type flash drying apparatus configured to dry an object to be treated with a gas by supplying the object into a gas stream circulating in a loop-type drying pipe,

• wherein the loop-type flash drying apparatus comprises:
• (i) a loop-type drying pipe;
• (ii) a feeding port configured to feed the object to be treated into the drying pipe;
• (iii) a second blowing port configured to blow the gas into the drying pipe;
• (iv) a discharge port configured to discharge the object from the drying pipe;
• (v) a discharge region formed by the drying pipe and the discharge port;
• and
• (vi) a first blowing port through which an accelerating gas for accelerating the gas flowing in the discharge region is linearly blown toward the discharge region, and
• wherein a cross-sectional area A (m2) of the drying pipe and an area B (m2) of the first blowing port have a relationship of 0.10<B/A<0.60.