RU2212951C1 - Pneumatic flotation machine - Google Patents

Abstract

FIELD: mineral concentration by flotation, particularly, designs of flotation machines with large-volume compartments; applicable in mining chemical and coal industries. SUBSTANCE: flotation machine includes compartment with gas-lift aerator installed in its center and made of two pipes of different diameters with cone-shaped adapter and having mixer in lower part. Mixer is made of concentrically located cylinders, of which internal one is perforated. Cylinders form air compartment to which air is supplied through air duct. Installed in compartment upper part is circular foam receiver and movable cone-shaped baffle plate. Machine is provided with loading appliance made in form of pipes located out of compartment and provided with branch pipes connected by means of flange to cylindrical end pieces having conical nozzles. Introduced into said end pieces are pipe unions for air supply. Conical nozzles are located in compartment lower part to region of auxiliary aerator. Number of pipes is, at least, two. Machine also includes unloading appliance. EFFECT: higher recovery of valuable components and quality of produced concentrates due to intensified air dispersion and increased pulp aeration. 1 dwg

Description

 The invention relates to the field of flotation mineral processing, in particular to the designs of flotation machines with large-volume chambers, and can be used in the mining, chemical and coal industries.

 A well-known foam separation machine containing a chamber with a discharge device, aerators, a distributor mounted on the chamber, an airlift and adjoining inclined decks installed in the chamber and forming pockets with airlift for the granular part of the pulp [USSR copyright certificate 1077644, cl. In 03 D 1/24, 1984].

 The disadvantage of the machine is its unreliability in operation due to the use of perforated rubber tubes, which during operation lose their elasticity, which requires increased air pressure to open the pores, and this increases their size and does not provide the required dispersion of air bubbles, thereby disrupting the flotation process .

 In addition, the incoming pulp with a high solid content (50%) does not have time to float, since the sand fraction is added to it, which is lifted by the airlift from the bottom of the chamber, dilution occurs, which leads to an increase in the volume of the pulp and, consequently, to a decrease in flotation time.

 The closest in technical essence and the achieved result to the proposed one is a flotation pneumatic machine, including a chamber with a gas lift aerator installed in the center with a mixer in the lower part, loading and unloading devices, a foam receiver and a cone-shaped chipper [RF patent 1422475, cl. In 05 D 1/24, 1993].

 In the known machine, the gas-lift aerator is a vertical pipe made of two parts of different diameters connected by a cone-shaped adapter, and the mixer in the lower part of the airlift is made of concentric cylinders, the inner of which is perforated in a checkerboard pattern.

The design of the flotation machine of the closest analogue provides insufficient dispersion of air per 1 m ³ of chamber volume and a small number of air bubbles with a diameter of less than 0.13 mm, which leads to an increase in air flow and a decrease in technological parameters of flotation.

 Another disadvantage of the known design is that when power is applied around the periphery in the upper part of the machine according to the countercurrent principle, slurry slips near the walls of the chamber, as a result of which the unaerated pulp goes into tails.

 In addition, in large-volume machines, it is not enough to have one gas-lift aerator. To achieve the required dispersion, it is necessary to increase air flow, which in turn leads to the destruction of the foam layer and reduces the quality of the concentrate and the extraction of a valuable component.

 The claimed design of the machine allows to increase the extraction of valuable components and the quality of the obtained concentrates due to the intensification of dispersion of air and increase the aeration of the pulp.

 The specified technical result is achieved by the fact that in the known flotation pneumatic machine, comprising a chamber with a gas lift aerator installed in the center with a mixer in the lower part, loading and unloading devices, a foam receiver and a cone-shaped chipper, according to the claimed invention, the loading devices are made in the form of peripherals placed outside the camera pipes with branch pipes connected to cylindrical tips having conical nozzles, while fittings for I supply air, nozzles are placed in the lower part of the chamber, and the number of pipes is at least two.

 The invention consists in the following.

 The implementation of loading devices in the form of pipes placed outside the chamber with branch pipes connected to tips having conical nozzles into which air is supplied, makes it possible to increase the aeration of the pulp and optimize the size of air bubbles by increasing the efficiency of its ejection into the pulp.

 The use of several (determined by the chamber volume) of the above loading devices located around the periphery of the chamber allows the entire pulp entering the machine to provide pre-conditioning.

 The drawing shows the proposed flotation pneumatic machine.

 The flotation pneumatic machine includes a chamber 1, a gas lift aerator 2 installed in the center of the chamber, consisting of two pipes of different diameters with a cone-shaped adapter 3. At the bottom of the gas lift aerator 2 there is a mixer 4 made of concentrically arranged cylinders, the inner of which is perforated. They form an air chamber 5 into which air enters through the duct 6. An annular foam receptacle 7 and a movable cone-shaped chipper 8 are installed in the upper part of the chamber 1. The flotation machine is equipped with a loading device 9 made in the form of a pipe 10 located outside the chamber with a branch pipe 11 connected using a flange 12 with a cylindrical tip 13 having a conical nozzle 14. A nozzle 15 for supplying air is introduced into the tip, and the conical nozzle 15 is placed in the lower part of the chamber 1 in the area of the auxiliary aeration 16. Flotation and pneumatic machine also includes an unloading device 17.

 The machine operates as follows.

 The pulp fed into the pipe 10, pretreated with reagents, enters through the nozzle 11 into the tip 13, where air is supplied under pressure through the nozzle 15. Through the conical nozzle 14, the aerated pulp is sprayed into the chamber 1. Air under pressure enters through the duct 6 into the air chamber 5 , wherefrom, through the holes in the inner cylinder of the mixer 4, it is fed into the pulp-lifting pipe of the gas-lift aerator 2. Air bubbles carry the aerated pulp along with them, forming an outflow of pulps in the airlift 2 zdushnoy mixture with a large interfacial surface that is reflected from the movable conical deflector 8 is supplied to the central chamber 1. The gas lift aerator provides vertical circulation of slurry in which the slurry is further saturated with fine bubbles of air.

 Hydrophobic particles in contact with air bubbles form flotocomplexes (concentrate) and, hitting a movable cone-shaped chipper 8, are discharged into an annular foam receiver 7. Hydrophilic, non-floated particles (tails) are lowered by gravity and unloaded through a discharge device 17. B an auxiliary aerator 16 is installed in the lower conical part of the chamber of the machine, designed to maintain the solid phase of the pulp in suspension during operation and start the machine after long periods of rest ovok under load.

 The inventive flotation machine allows to achieve effective aeration of the entire volume of pulp, reduce flotation time, improve the quality of the concentrate, i.e. generally intensify the flotation process.

Claims (1)

 Pneumatic flotation machine, including a chamber with a gas lift aerator installed in the center with a mixer in the lower part, loading and unloading devices, a foam receiver and a cone-shaped chipper, characterized in that the loading devices are made in the form of pipes located outside the chamber along the periphery with outlet pipes connected to cylindrical tips having conical nozzles, while nozzles for supplying air are introduced into the tips, nozzles are placed in the lower part of the chamber, and the number of pipes at least two.