| 摘要 |
699,045. Froth-flotation apparatus; impellers. BOLIDENS GRUVAKTIEBOLAG. Aug. 2, 1951 [Aug. 2, 1950], No. 18337/51. Classes 82(ii) and 86 A mixing impeller for a froth flotation machine comprises a disc 3, to the upper side of which radial blades s 4 are secured, and a guide baffle device surrounding t h e blades, there being a peripheral recess 5 in the disc between each blade which is deepest adjacent the blade trailing edge. Each baffle 9 of the baffle device is at a small angle "a" to the radius of the impeller. Smaller radial blades 10 are fitted beneath the disc 3. |
