RU2441707C2 - Air flotation column machine - Google Patents

Abstract

FIELD: mineral processing.

SUBSTANCE: invention refers to mineral processing, particularly to column flotation constructions which can be used in mineral material processing containing non-ferrous, ferrous, rare, noble and non-metal materials. Flotation machine includes body consisting of widened upper part and bottom part, central tube, located in the widened part of the body, foam collector, feeding, aerating and discharge devices. Foam collector is located concentrically in the upper widened part of body and made in the form of circular groove formed from the outside by the outer diameter of central tube and from other side - by the generator line of foam collector, outer diameter of which is defined according to the formula

D_{outer of foam}.=k₁·d_{inner of foam}

where:

D_{outer of foam} - outer diameter of foam collector, m;

k₁ - empirical coefficient to define the outer diameter of foam collector; from 1.30 to 1.50 depending on the type of material flotated;

d_{inner of foam} - internal diameter of foam collector, m; defined according to the formula:

d_{inner of foam}= d_centr.tube=d_{bottom body}= k₂·Q;

d_centr.tube - diameter of central tube, m;

d_{bottom body} - diameter of the bottom body part, m;

Q - specified productivity of the machine on raw product, t/h;

k₂ - empirical coefficient to define the outer diameter of foam collector, central pipe diameter and bottom body part diameter; from 0.005 to 0.008.

EFFECT: increase of flotation machine effectiveness.

2 cl, 1 dwg, 1 tbl

Description

The invention relates to the field of mineral processing, in particular to the designs of flotation machines of the column type, which can be used in the processing of mineral raw materials containing non-ferrous, ferrous, rare, precious metals, as well as non-metallic minerals.

A known design of a pneumatic flotation machine, protected by RF patent No. 2038865, B03D 1/24. 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.

A known flotation pneumatic machine, including a chamber with an aerator placed inside, a loading and unloading device installed in the center of the chamber, an airlift with a mixer in the lower part (see RF patent No. 2054972, B03D 1/24).

A known flotation pneumatic machine, including a chamber with a set of concentrically arranged containers for direct-flow and counter-flow flotation, dispersants, loading and unloading devices, a foam collector located between concentrically located containers for direct-flow and counter-current flotation (see USSR copyright certificate No. 5998647, B03D 1/14 )

The disadvantage of this machine is the complexity of its design, and the lack of dependence on the size of the foam trough does not provide its sufficient transportation capacity, which leads to inoperability of the flotation machine as a whole.

The closest in technical essence is a flotation pneumatic column machine, including a casing, consisting of an expanded upper and lower parts, a central pipe located in the expanded part of the casing and dividing the upper expanded part of the casing into the main flotation and doflotation chambers, a foam collector made in the form of a gable gutters and located on the outer side of the expanded part of the housing, a feeding device made in the form of ejectors, a discharge device, aerators, rings th bump, which is a cross-sectional triangle whose vertex is directed toward the axis of the machine (see. Russian patent №2281169, B03D 1/24).

A disadvantage of the known machine is that the foam product from the doflotation chamber through its upper cut enters the foam layer of the main flotation chamber and, further, into the foam trough, which leads to collision and mutual destruction of the air bloc in the foam layer. This drawback causes a decrease in the productivity of the flotation machine for the foam product and leads to the fact that it does not work effectively in those flotation operations where a large yield of foam product is required.

The technical problem to which the invention is directed is to increase the productivity of the machine for the foam product by eliminating the supply of the foam product of the doflotation chamber to the foam layer of the main flotation chamber and optimizing the size of the foam trough.

This result is achieved in that in a flotation pneumatic machine, comprising a housing consisting of an expanded upper part and a lower part, a central pipe located inside the expanded part of the body, a foam collector, feeding, aerating and unloading devices, a foam collector is located concentrically inside the upper expanded part of the body and made in the form of an annular groove formed on the one hand by the outer diameter of the central pipe, and on the other, forming a foam collector, the diameter of which is determined from the head dence

D _{ext. Pen.} = k ₁ · d _{int. Pen}

Where:

D _{ext. Pen.} - outer diameter of the foam collector, m;

k ₁ - empirical coefficient for determining the outer diameter of the foam collector, selected from 1.30 to 1.50 depending on the type of floated raw materials;

d _{int. Pen.} - inner diameter of the foam collector, m; determined from dependency

d _{int. Pen.} = d _{center. pipes} = d _{lower Bldg.} = k ₂ · Q;

d _{center. pipes} - the diameter of the central pipe, m;

d _{lower Bldg.} - diameter of the lower part of the body, m;

Q - the given productivity of the machine according to the initial product, t / h;

k ₂ is an empirical coefficient for determining the inner diameter of the foam collector, the diameter of the central pipe and the lower part of the body, selected from 0.005 to 0.008.

The optimal value of the coefficient k _{1 is} determined experimentally. In the process of research it was found that if the value of k _{1 is} too small, the transport capacity of the foam trough decreases sharply due to its insufficient width, and when the value of k _{1 is} excessive due to an excessive increase in the width of the foam trough, the foaming area in the main flotation chamber is unreasonably reduced, which leads to reduced performance of the machine for the foam product.

The optimal inner diameter of the foam collector, equal to the diameters of the central pipe and the lower part of the cylindrical body of the column of the flotation machine, depends on the amount of pulp passed through it, i.e. from the performance of the machine on the original product. As experimental studies have shown, the optimal diameter of the lower part of the body and its productivity in the initial product are related by the ratio d _{lower. Bldg.} = k ₂ · Q, where the proportionality coefficient k ₂ between them can take values from 0.005 to 0.08.

The invention is illustrated in the drawing, where figure 1 shows a General view of a flotation pneumatic column machine.

The flotation machine includes a casing, consisting of an expanded upper part 1, lower part 2, a central tube 3 located in the expanded part of the casing 1 and dividing the upper expanded part of the casing into the main flotation 4 and doflotation chambers 5, a foam chute 6, located between the central pipe 3 and generatrix 7. The main doflotation chamber 5 is equipped with an aeration device 9 located in its lower part. In addition, the main doflotation chamber 5 is equipped with a bottom unloading device 10, and the foam trough 6 has nozzles for removing the foam product 11 and an annular chipper 12.

Flotation machine operates as follows.

The pulp pretreated with reagents enters through the ejector 8 into the main flotation chamber 4. At the same time, air enters the ejector 8, which comes into contact with the hydrophobic grains of the pulp, forming aeroflocles. Aeroflocules, emerging, form a foam product. The foam product is unloaded into the foam trough 6 and through the nozzles 11 is sent to the condensation (not shown in the drawing). The upper cut of the outer wall of the main flotation chamber 4 is higher than the upper cut of the foam trough 6, which excludes the overflow of the foam product of the main flotation chamber 4. Grains with insufficiently hydrophobized surface, as well as hydrophilic grains, are discharged into the preflotation chamber 5. The annular bump 12 allows contact of the mineral and air bubbles not in countercurrent, but at an angle, i.e. create optimal conditions for flotation of grains in the flotation chamber 5. In the aeration device 9 of the flotation chamber 5, air floccules are created that form a foam product in the upper part of the flotation chamber 5. Hydrophilic grains are lowered into the bottom of the flotation chamber 5 and removed through the bottom unloading device 10. Foamy the product from the doflotation chamber 5 through its upper slice also enters the foam trough 6 and is sent through the nozzles 11 for thickening.

The inventive flotation machine was tested in the operation of the main flotation of copper-containing ore in comparison with the well-known machine KFM-1400M. The test results are presented in table 1.

Table 1 Test results No. p.p. Name of indicator Flotation machines The claimed KFM-1400M one Productivity by foam product, t / h 14,4 11.0 2 The copper content in the foam product,% 8.18 8.12

The results of table 1 indicate that the claimed design of the flotation pneumatic machine due to the location of the foam collector inside the upper part of the housing near the lateral surface of the central tube (which excluded the flow of the foam product of the doflotation chamber onto the foam layer of the main flotation chamber), as well as the optimization of the size of the foam trough, foam product performance without compromising on quality.

Claims (2)

1. Flotation pneumatic column machine, comprising a housing consisting of an expanded upper part and a lower part, a central pipe located inside the expanded part of the housing, a foam collector, feeding, aerating and unloading devices, characterized in that the foam collector is located concentrically inside the upper expanded part of the housing and made in the form of an annular groove formed on one side by the outer diameter of the central pipe, and on the other hand, forming a groove, the outer diameter of which is determined from the dependence:
D _{ext. nep} = k ₁ · d _int.pen
Where
D _{ext. foam} - the outer diameter of the foam collector, m;
k ₁ - the empirical coefficient for determining the outer diameter of the foam collector is selected from 1.30 to 1.50 depending on the type of floated raw materials;
d _{int. foam} - the inner diameter of the foam collector, m; determined from dependency
d _{int. pen} = d _{center. pipes} = d _{lower corp} = k ₂ · Q;
d _{center. pipes} - the diameter of the central pipe, m;
d _{lower corp} - the diameter of the lower part of the body, m;
Q - the given productivity of the machine according to the initial product, t / h;
k ₂ - the empirical coefficient for determining the inner diameter of the foam collector, the diameter of the Central pipe and the lower part of the housing is selected from 0.005 to 0.008. 2. Flotation pneumatic column machine according to claim 1, characterized in that the Central tube is located above or at the same level with the foam collector.

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