RU1688499C - Pneumatic floatation machine - Google Patents

Abstract

FIELD: mineral resources floatation. SUBSTANCE: machine has chamber 1 with aerator 9 positioned inside. Airlift 2 in the form of vertical tube 11 with mixer 3 in the lower part is located on the chamber axis. The mixer is made from concentrically located cylinders of which the inner one is perforated. Pulp-air mixture power disperser 7 is located above the mixer and is made from disks with central holes fastened coaxially and in a spaced relation. The lower disk is fastened to tube 11 by the central hole. The diameter of the central holes decreases as removed from tube 11 according to a relation presented in the description of the invention. The pulp enters chamber 1 through loading device 8 and is aerated by air bubbles in mixer 3. The pulp-air flow enters disperser 7 through tube 11 and then is fed to the upper part of the chamber. The foam product is removed to foam receiver 6 located in the upper part of chamber 1. The tails are discharged through discharging device 10. EFFECT: improved aeration efficiency and improved foam product discharge. 3 dwg

Description

 The invention relates to flotation concentration of minerals, in particular, to the designs of flotation machines with large cameras.

 The aim of the invention is to increase the efficiency of aeration due to the ability to control the size of the air bubbles and accelerate the unloading of the foam product.

 Figure 1 shows a flotation pneumatic machine; figure 2 - node I in figure 1; figure 3 is a view from the download side of figure 2.

 The flotation pneumatic machine contains a chamber 1, an airlift 2. At the bottom of the airlift pipe there is a mixer 3 made of concentrically arranged cylinders, the inner of which is perforated. They form an air chamber 4 into which air is supplied through the duct 5, the inner tube having openings for supplying air to the pulp.

 The machine also includes a foam receptacle 6, a movable disk dispersant 7 of the energy of the pulp-air mixture, a loading device 8, an auxiliary aerator 9, a discharge device 10 of the chamber product, a vertical supply (conveying pipe 11, movable disks 12, coaxially fixed with a clearance by a coupling bolt 13 and spacer sleeves 14 .

The machine operates as follows. The pulp enters the chamber through the loading device 8. The air through the duct 5 and the air chamber 4 through the holes is fed into the inside of the airlift 2. Air bubbles entrain floatable particles and pulp, formed in airlift 2, the outflow of the pulp-air mixture with a large interfacial surface, which is divided disk 12 into separate streams, which control the movement is changed by an angle ⁹⁰ along the drive. Moving in the space between the disks 12 from the center to the periphery, the cross-sectional area of the jet increases, and the speed decreases to the calculated value. From the dispersant 7, the pulp enters the chamber 1.

, где i - порядковый номер диска 12. считая от подводящей трубы 11;
d_i - диаметр центрального отверстия i-го диска 12;
N - количество дисков 12;
d_тр - внутренний диаметр подводящей трубы 11.In order to separate 12 discs of different sizes by each disk, the diameters of the central holes must be determined by the formula
d _i = d

where i is the serial number of the disk 12. counting from the inlet pipe 11;
d _i - the diameter of the Central hole of the i-th disk 12;
N is the number of disks 12;
d _Tr - the inner diameter of the supply pipe 11.

The selected ratio of the diameters of the internal openings of the disks 12 forming the disk dispersant 7 provides a decrease in the flow rate of the pulp-air mixture, which creates better conditions for the formation and preservation of flotation complexes by crushing larger bubbles on the surface of the disks 12, as well as intensive unloading of the foam product separated by separate disks into separate jet whose direction is changed by an angle of ⁹⁰ ° along the drive. Moving into the space between the disks from the center to the periphery, the cross-sectional area of the jet increases, which allows accelerated unloading of the foam product.

 Productivity of the machine can be regulated by the gap between the disks 12. (56) Meshcheryakov I.F. Flotation machines. M .: Nedra, 1972, p.29-41, 119-125.

 USSR copyright certificate N 1422475, cl. B 03 D 1/24, 1986.

Claims (1)

PNEUMATIC FLOTATION MACHINE, containing a chamber with an aerator placed in it, loading and unloading devices, a foam receiver installed in the center of the chamber airlift in the form of a vertical pipe with a mixer in the lower part made of concentrically arranged cylinders, the inner of which is perforated, characterized in that, in order to increase the efficiency of aeration, it is equipped with a dispersant of a pulp-air mixture mounted above the mixer and made of disks with central holes fixed coaxially with a gap relative to each other, and the lower disk with a central hole covers the airlift pipe perpendicular to its axis, and the diameter of the Central holes of the remaining disks decreases with distance from the airlift pipe in accordance with the dependence
d _i = d

,
where i is the serial number of the disk from the airlift pipe;
d _i - the diameter of the Central hole of the i-th disk, m;
N is the number of disks;
d _Tr - the inner diameter of the airlift pipe, m

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