| 摘要 |
The invention concerns an equipment and a method for producing ultra fine dry powders by means of an energetic power gas using an opposed jet mill (2.3) and a classifier (3) and a device (5, 6) for separating gas and solids connected thereto. The invention is characterized in that the device for separating gas and solids from each other (5, 6) comprises at least one ion jet tube (5, 6) with a concentrically extending high voltage electrode (5.4) provided with a large number of radial ion jet tips (5, 6), whereby the solid particles of the gas solid suspension led at a low speed through the ion jet tube (5, 6) are attached to the inner walls of the tube (5, 6) at the influence of ion jets developed by the ion jet tips (5.6), from which walls the particles are easily recoverable in exactly limited fractions, and the purified power gas is arranged to discharge from the opposite end of the ion jet tube (5, 6), and that in order to control the operation of the equipment an on-line operating measuring and analysing device (4), coupled to a control unit of the equipment, is mounted into the discharge channel (3.5) for the fine fraction in order to determine the particle size and the fineness of the solid particles of the gas-solid suspension flowing through the discharge channel (3.5). |
