PNEUMATIC FLOATATION MACHINE Russian patent published in 1996 - IPC

FIELD: floatation. SUBSTANCE: additional deflecting dome-shaped member 40 made for rotation about the vertical axis and with helical ribs 70 and 71, located on its upper and lower surfaces respectively, is positioned under attachment 31 of cyclone 19 installed around machine cylindrical compartment 1 coaxially with it and above main deflecting cone-shaped member 68 with annular gap 67. Branch pipe 72 for supply of compressed air with holes 73 in its lower part is introduced inside deflecting cone-shaped member 40. The upper end of branch pipe 72 by means of bearing 75 is coaxially connected to delivery air duct 76. The lower end of branch pipe 72 through ball bearing 74 rests on the top of deflecting cone-shaped member 68. Ribs 71 rest on fluoroplastic coating 69 of the upper surface of deflecting cone-shaped member 68. Deflecting cone-shaped member 68 is coaxially secured on branch pipe 72. Tap 60 is furnished with branch pipe 61 used for removal of coarse-grained fraction, and with aerator 63. Pulp through filling funnel 27 is fed to cyclone 19 where its coarse-grained fraction is separated, which, passing through attachment 31, gets aerated. From cyclone 19 coarse-grained fraction is uniformly distributed by deflecting cone-shaped member 40 over surface 20 and then gets onto the froth blanket. Overflow of hydraulic cyclone 19 is fed to dividers 43, where it is divided into medium-and fine-grained fractions. The first is fed to mixer 13, where it is aerated and goes up to cone-shaped distributing device 5. Fine-grained fraction through collectors 50 and chutes 51 is fed to distributor 44 and then, through windows 54, to compartment 1. Floation complexes formed in compartment 1 go up and together with froth blanket are removed to chute 3, and tailings are unloaded through appliance 2 for unloading of compartment product. EFFECT: enhanced indices of floatation process due to improved conditions of feed of material coarse-grained fractions onto froth blanket. 2 cl, 9 dwg