Vortex chamber device, and method for treating powder particles or a powder particles precursor

A vortex chamber device comprising:

• a reactor comprising at least one chamber having a substantially circular cross-section;
• a device for feeding at least one fluid that is gaseous or liquid into the chamber;
• a device for removing said one or more fluids from the chamber;
• a device for feeding powder particles or a powder particles precursor to said chamber;
• wherein said fluid removing device comprises at least one discharge opening for removing said at least one fluid from the chamber;
• wherein said fluid feeding device comprises fluid injectors distributed around a chamber wall for injecting said at least one fluid along said wall, for transferring momentum to said powder particles or the powder particles precursor to enable a rotational movement whereby a centrifugal force thrusts the particles or precursor toward said wall through said injected fluid;
• said powder particles or the powder particles precursor thereby forming a rotating fluidized bed which rotates around and at a certain distance from said fluid discharge opening while sliding along said chamber wall and while being at least partially supported by said at least one fluid which passes through said fluidized bed before being removed via said discharge opening;
• wherein said fluid feeding device comprises more than 11 primary fluid injectors, with each of the fluid injectors including a fluid injection slit having a slit width that is smaller than 1 mm.