Particle separation device for additive manufacture and additive manufacturing apparatus

A device for separating particles for selective additive manufacturing, the particles being contained in a gas stream, the device comprising:

• at least one dry-type aeraulic separator, the dry-type aeraulic separator comprising a separating turbine with a variable speed of rotation, and the dry-type aeraulic separator selecting the particles contained in the gas stream according to a particle size depending on a speed of rotation of the separating turbine;
• an extraction device for extracting the particles contained in the gas stream,
• wherein the at least one dry-type aeraulic separator and the extraction device are in fluidic communication such that a gas stream exiting the dry-type aeraulic separator circulates through the extraction device and such that a gas stream exiting the extraction device circulates through the dry-type aeraulic separator,
• wherein the device for separating particles also comprises a device for circulating the gas stream between the dry-type aeraulic separator and the extraction device, and
• wherein the device for separating particles further comprises a control device configured to dynamically control the variable speed of rotation of the separating turbine depending on the particle size at which the particles are to be separated.