WO2022124941A1

WO2022124941A1 - Pneumatic flotation column machine

Info

Publication number: WO2022124941A1
Application number: PCT/RU2021/050404
Authority: WO
Inventors: Марк Григорьевич ВИДУЕЦКИЙ; Игорь Фагамьянович ГАРИФУЛИН; Александр Петрович ПУРГИН
Original assignee: Общество С Ограниченной Ответственностью "Ра-Груп"
Priority date: 2020-12-07
Filing date: 2021-12-01
Publication date: 2022-06-16

Abstract

A pneumatic flotation column machine contains a housing comprising a cylindrical flared upper part, a lower cylindrical part, an intermediate part situated between said upper and lower parts, and a bottom part configured in the form of a cone and connected to the lower part. The upper part of the housing comprises feed devices and aerating devices in the form of ejectors, and a foam collector. Fastened inside the upper part is a central pipe. The lower part of the housing comprises aerating devices configured for vertical movement and locking at a given submersion depth. Arranged on the inside surface of the lower cylindrical part of the housing, at the boundary with the intermediate part, is a structural element in the form of a ring, the cross-section of which has the shape of a vertically oriented trapezoid, the smaller base of which faces toward the centre of the ring.

Description

Flotation Column Pneumatic Machine

FIELD OF TECHNOLOGY

The utility model relates to the field of mineral processing, namely, pneumatic flotation devices for processing mineral and technogenic raw materials containing non-ferrous, ferrous, rare, precious metals, non-metallic minerals, as well as for treating dump and waste water.

BACKGROUND OF THE INVENTION

Known pneumatic flotation machine (RF No. 2038865) DE The machine includes a chamber with an aerator located in it, a foam threshold, a loading device in the form of a pipe with holes and a circulation pipe. The disadvantage of this machine is that the increase in the extraction of the useful component into the concentrate is carried out due to the multiple circulation of the feedstock, thereby reducing the productivity of the machine.

Known pneumatic flotation machine (WO 2006/061265 A1) D2, including a cylindrical body consisting of an expanded upper and lower parts, a transitional part between them in the form of a truncated cone, a bottom conical part, feeding, aerating and unloading devices, a foam collector made in the form gable chute and equipped with nozzles for removing the foam product, located opposite each other. The diameter of the upper expanded part of the machine body is determined by the mathematical dependence on the height of the machine body and the diameter of its lower cylindrical part. The disadvantage of this machine is the non-optimal conditions for the contact of mineral particles with air bubbles in the lower part of the machine body, which leads to insufficient extraction of difficult-to-float particles in the lower cylindrical part of the body.

Also known is a flotation pneumatic column machine (RF patent No. 2281169) DZ, including a body consisting of a cylindrical upper expanded and lower parts, a transitional part between them in the form of a truncated cone, a bottom conical part, a supply, aerating and unloading devices, a foam collector, a structural element in the form of a ring, located on the inner surface of the lower cylindrical part of the housing at the border with the transitional part, the cross section of which is an equilateral triangle, the top of which is directed towards the central axis of the machine. The structural element reduces the angle of collision of mineral particles descending and emerging air bubbles from 180 ⁰ to 90-135°. The disadvantage of this solution is the absence of a zone with an increased concentration of air bubbles in the lower cylindrical part of the body, which leads to insufficient extraction of difficult-to-float particles.

DISCLOSURE OF UTILITY MODEL

The objective of this utility model is to eliminate the above disadvantages of the prior art.

The technical result of the proposed utility model is to increase the recovery of difficult-to-float particles in order to increase the total recovery of the useful component in the foam product of the flotation machine, by increasing the zone with a high concentration of air bubbles.

The specified technical result of the claimed utility model is achieved due to the fact that the flotation column pneumatic machine includes a housing containing a cylindrical expanded upper part, a lower cylindrical part, a transitional part located between the upper and lower parts, a bottom part made in the form of a cone and connected to the lower part, the upper part of the body contains feeding and aerating devices in the form of ejectors, a foam collector, and a central pipe is fixed inside the upper part, the lower part of the body contains aerating devices made with the possibility of vertical movement and fixation at a given immersion depth, while on the inner surface of the lower On the cylindrical part of the housing, at the border with the transition part, there is a structural element in the form of a ring, the cross section of which is a vertically located trapezoid, the smaller base of which is directed towards the center of the ring.

BRIEF DESCRIPTION OF THE DRAWINGS

The figure 1 shows a General view of the claimed flotation machine.

The figure 2 shows an enlarged sectional view of the lower cylindrical part of the housing at the border with the transition part with a structural element.

IMPLEMENTATION OF UTILITY MODEL

In FIG. 1 shows a general view of the flotation machine, which includes the upper extended part of the body - the main flotation chamber 1, equipped with feeding and aerating devices - ejectors 2, a single or multi-slope froth chute 3, equipped with nozzles for removing the foam product 4, a central pipe 5, a transitional part of the body 6, the lower part of the body 7, equipped with aerating devices 8 with the possibility of their vertical movement and fixation at a given immersion depth, the bottom part of the body 9, equipped with a bottom unloading device 10. On the inner surface of the lower cylindrical part of the body, at the border with the transition part, there is a structural element 11 in the form of a ring, the cross section of which is a vertically located trapezoid, the smaller base of which is directed towards the center of the ring. The angle of inclination of the sides of the trapezoid to its expanded base is 45°.

A structural element in the form of a ring, the cross section of which is a vertically located trapezoid, not only ensures the collision of falling down mineral particles and emerging air bubbles at an angle of 90 to 135 °, but also creates a zone with a reduced cross-sectional area compared to the lower cylindrical part of the housing, shaped like a vertical cylinder. The height of the specified zone H is equal to the length of the smaller base of the trapezoid, the diameter d is equal to the inner diameter of the ring.

The concentration of air bubbles formed in the lower level aerators and floating up during the passage of this zone increases due to a decrease in the cross-sectional area, which causes an increase in the intensity of their contact with mineral particles and increases the likelihood of fixing hard-floating mineral particles on air bubbles.

The flotation machine works as follows.

The slurry pre-treated with reagents enters through the upper level ejectors 2 into the upper expanded part of the body 1. At the same time, air enters the upper level ejectors 2, which comes into contact with the easily floatable pulp grains, forming air floccules. Aeroflocculi floating up, form a foamy product. The foam product is unloaded into the foam collector 3 and sent to subsequent operations. Difficult-floating and non-floating mineral grains pass through the transitional part 6 of the body, and enter the zone of intense contact with air bubbles, limited by the device 11 (Fig. 2, highlighted in gray). Difficult-floating mineral grains are fixed on air bubbles, then float up into the upper expanded part of the body inside the central pipe 5 and are unloaded into the foam collector 3. Non-floating grains sink into the bottom part of the body 9 and are removed through the bottom unloading device.

The optimal diameter of the lower part of the cylindrical body of the flotation column depends on the amount of pulp passed through it, i.e. on the productivity of the machine for the initial pulp. As shown by the test results and operating experience, for the pilot flotation machine KFM-120 with an internal diameter of the lower part of the body of 0.11 m (taking into account the wall thickness of the machine body), the optimal performance for the initial pulp is from 1.5 to 2.0 m ³ /h, and for industrial flotation machine KFM-1400 with an internal diameter of the lower part of the body of 1.38 m (taking into account the wall thickness of the machine body) - from 170 to 240 m ³ /h. The pulp throughput of the machine is determined by the cross-sectional area of the lower part of the machine body, the formula of which includes the diameter of the lower part of the body squared. Thus, the square of the optimal diameter of the lower part of the machine body and its performance are related by the relation D ² = k2 V, or:

where the coefficient of proportionality kg, regardless of the size of the pilot or industrial flotation machine, can take values from 0.006 to 0.009.

Experimental studies have determined the dependence of the optimal inner diameter d of a structural element in the form of a ring, the cross section of which is a vertically located trapezoid, on the diameter of the lower cylindrical part of the machine body D (table 1). The studies were carried out on a pilot flotation machine with an internal diameter of the lower part of the body D = 0.11 m during the flotation of copper ore. The height of the zone of intense contact of mineral particles with air bubbles H was 0.01 m. The inner diameter of the structural element was varied from 0.10 to 0.09 m.

Table 1 - Dependence of the flotation indices of copper-bearing ore on the inner diameter of a structural element in the form of a ring, the cross section of which is a vertically located trapezoid.

From the data given in Table 1, it can be seen that the highest recovery of copper into the concentrate was obtained when installing a structural element in the form of a ring, in which the inner diameter d, the empirical coefficient ki and the diameter of the lower part of the body D are related by the ratio: d = krD or 0.095 = 0.86 0.11

Thus, according to the results of experiments, the empirical coefficient ki for determining the optimal inner diameter of a structural element in the form of a ring, the cross section of which is a vertically located trapezoid, is chosen from 0.8 to 0.95.

Experimental studies have determined the dependence of the optimal height of the zone with an increased concentration of air bubbles H on the diameter of the lower part of the body of the flotation machine D (table 2). The studies were carried out on a pilot flotation machine with an internal diameter of the lower part of the body D = 0.11 m during the flotation of copper ore. The inner diameter of the structural element in the form of a ring was d = 0.095 m. The height of the zone with an increased concentration of air bubbles H varied from 0.01 to 0.04 m.

Table 2 - Dependence of flotation indices of copper-bearing ore on the height of the zone of high concentration of air bubbles.

From the data given in Table 2, it can be seen that the highest recovery of copper into concentrate was obtained on a flotation machine, in which the height of the zone with an increased concentration of air bubbles (H), the empirical coefficient (kz) and the diameter of the lower part of the body are related by the ratio:

H \u003d k ₃ D or 0.02 \u003d 0.18 0.11

Thus, according to the results of experiments, the empirical coefficient k for determining the optimal height of the zone with an increased concentration of air bubbles was chosen from 0.15 to 0.20. The inventive flotation machine with a structural element in the form of a ring, the cross section of which is a vertically located trapezoid, was tested in the operation of the main copper flotation on a pilot flotation machine KFM-120 with an inner diameter of the lower cylindrical part of the body of 0.11 m (taking into account the wall thickness of the machine body) , in comparison with a similar machine with a structural element in the form of a ring, the cross section of which is a triangle. The test results are presented in table 3.

Table 3 - Test results of pilot flotation machines.

The results of table 3 indicate that when testing pilot flotation machines, the inventive design with a structural element in the form of a ring, the cross section of which is a vertically located trapezoid, made it possible to increase the total extraction of the useful component into the froth by 3.29% (abs.). The inventive flotation machine with a structural element in the form of a ring, the cross section of which is a vertically located trapezoid, was also tested in the operation of the main copper flotation on an industrial flotation machine KFM-1400 with an inner diameter of the lower cylindrical part of the body of 1.38 m (taking into account the wall thickness of the machine body ), in comparison with a similar machine with a structural element in the form of a ring, the cross section of which is a triangle. The test results are presented in table 4.

Table 4 - Results of tests of industrial flotation machines.

The results of Table 4 indicate that when testing industrial flotation machines, the proposed design with a structural element in the form of a ring, the cross section of which is a vertically located trapezoid, made it possible to increase the total extraction of the useful component into the froth by 6.59% (abs.)

Claims

UTILITY MODEL FORMULA

1. Flotation column pneumatic machine, including a housing containing a cylindrical expanded upper part, a lower cylindrical part, a transitional part located between the upper and lower parts, a bottom part made in the form of a cone and connected to the lower part, the upper part of the housing contains supply and aerating devices in the form of ejectors, a foam collector, and a central pipe is fixed inside the upper part, the lower part of the body contains aerating devices made with the possibility of vertical movement and fixation at a given immersion depth, characterized in that on the inner surface of the lower cylindrical part of the body at the border with the transitional part a structural element in the form of a ring is placed, the cross section of which is a vertically located trapezoid, the smaller base of which is directed towards the center of the ring.

2. Flotation pneumatic machine according to claim 1, characterized in that the inner diameter of the annular structural element is determined from the dependence: d = k _r D where: d is the inner diameter of the annular structural element, m; kl - empirical coefficient for determining the inner diameter of the annular structural element, selected from 0.8 to 0.95;

D - diameter of the lower cylindrical part of the body, m, depending on the volume of the supplied pulp according to the ratio:

where: k2 - empirical coefficient for determining the diameter of the lower part of the cylindrical body, selected from 0.006 to 0.009

V is the amount of supplied pulp, m ³ /h.

3. Pneumatic flotation machine according to claim 1, characterized in that the smaller base of the trapezoid of the annular structural element is determined from the dependence:

H = k ₃ D where:

H - the length of the smaller base of the trapezoid, m;

eight kz - empirical coefficient for determining the optimal length of the smaller base of the trapezoid, selected from 0.15 to 0.20; D - diameter of the lower cylindrical part of the body, m.

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