RU2171147C1 - Pneumatic floatation machine - Google Patents

Abstract

FIELD: concentration equipment; foam flotation. SUBSTANCE: flotation pneumatic machine includes flotation chamber with aeration units arranged inside it, chamber for preparation of pulp for flotation, concentrate and tailings loading and unloading units. Chamber for preparation of pulp for flotation is mounted in such way that it has common wall with flotation chamber and its upper portion is engageable with lesser base of taper portion of loading unit where cut-off gate is fitted. Aeration units are made in form of cassettes with microporous baffle which are mounted in bases of flotation and pulp preparation chambers which are communicated by means of adjustable clearance between common wall and microporous baffle of cassette. Concentrate is unloaded from flotation chamber by means of adjustable valve which consists of two perforated disks; one disk is movable. Tailings unloading unit is located in flotation chamber. EFFECT: possibility of flotation of unclassified materials at high density; intensification of flotation process; reduced power requirements. 3 dwg

Description

 The invention relates to mineral processing, in particular to the designs of flotation machines of a pneumatic type, and can be used in the mining, chemical and coal industries.

 Known pneumatic flotation machine, including a bath, an aerator, rigidly connected to a conveying device, slide devices to maintain pulp and foam layer levels, devices for separate discharge of foam and chamber products, drive. The machine is equipped with an autoregulator for supplying air to the aerator kinematically connected with an electromechanical drive, and the aerator is mounted with the possibility of reciprocating motion along an elliptical trajectory [USSR copyright certificate N 1150035, cl. B 03 D 1/24, 1985].

 A disadvantage of the known machine is the complicated mechanism of the reciprocating movement of the aerator, during which breakthroughs of the unaerated pulp are possible, and its operation is short-lived, in addition, the pulp from the source power receiver immediately enters the bath, leaving no time for contact of air bubbles on the mineral particles in the pulp , which dramatically reduces the effectiveness of their flotation.

 The closest analogue to the proposed device is a known pneumatic flotation machine, including a chamber for preparing pulp for flotation, having a common wall with a flotation chamber, the upper part of the chamber for preparing pulp for flotation is associated with a smaller base of the conical part of the loading unit in which the shutter gate is installed, a device for aeration installed at the base of the chamber for preparing pulp for flotation, a discharge unit for concentrate located in the flotation chamber, and a discharge unit for x skeleton [Copyright certificate USSR N 1316701, cl. B 03 D 1/24, 1987].

 In the known machine, the flotation chamber and the preparation chamber for the pulp for flotation are installed in a sealed enclosure having air supply and exhaust fittings, and the air supply regulating device is made in the form of a pneumatically controlled distributor having a supply and drain line, a large and a small piston and a pneumatic accumulator controlled.

 The disadvantage of this flotation machine is the difficulty of adjusting the air supply, which is difficult to achieve in a continuous production process. The use of a piston regulator does not ensure the durability of the device, since moisture penetration into the piston system leads to corrosion and wear of the piston seal. It is also necessary to introduce a preliminary classification into a well-known machine, because when loading raw materials, a gravitational classification occurs, as a result of which large material does not have time to float and immediately passes into tails. In addition, the resulting concentrate is of poor quality, because cleaning of the foam product is not provided.

 All of the above reduces the technical, economic and technological indicators of the flotation process.

 The inventive design of the machine allows you to float unclassified material with a high density and increase the intensification of the flotation process by increasing the extraction of valuable minerals, improving the quality of the concentrate and reducing energy consumption.

 The specified technical result is achieved by the fact that the known flotation pneumatic machine, including a chamber for preparing pulp for flotation, having a common wall with a flotation chamber, the upper part of the chamber for preparing pulp for flotation, is associated with a smaller base of the conical part of the loading unit in which the shutter gate is installed, a device for aeration installed at the base of the chamber for preparing pulp for flotation, a discharge unit for concentrate located in the flotation chamber, and an discharge unit for tailings, with According to the invention, the machine is equipped with an additional aeration device installed at the base of the flotation chamber, while the aeration devices are made in the form of cassettes with a microporous baffle, the flotation chamber and preparation of pulp for flotation are communicated by means of an adjustable gap between the common wall and the microporous baffle of the cassette, and unloading the concentrate unit has an adjustable valve consisting of two disks with holes, one of which, mounted on an axis, is movable m, and the unloading unit for the tailings is located in the flotation chamber.

 The invention consists in the following.

 Providing the machine with an additional aeration device installed at the base of the flotation chamber allows the flotation process to be intensified.

 The implementation of devices for aeration in the form of cassettes ensures their quick change, and the microporous partition of the cassette allows the rational use of air in contact with the pulp.

 The discharge of concentrate through an adjustable valve allows you to maintain the required level of foam in the flotation chamber.

 In FIG. 1 shows the proposed flotation pneumatic machine, FIG. 2 is a section along BB, in FIG. 3 - view A.

 The flotation pneumatic machine includes a loading unit 1 with a shutter gate 2 installed in its lower part, a pulp preparation chamber for flotation 3, a flotation chamber 4 having a common wall 5 with a pulp preparation flotation chamber 3, installed in the bases of chambers 3 and 4 with a microporous partition 6 aeration cassettes 7, concentrate unloading unit 8, tailings unloading unit 9 and adjustable valve 10.

 The machine operates as follows.

 The coarsely ground unclassified pulp treated with reagents enters the loading unit 1 and then through the shut-off gate 2 into the chamber to prepare the pulp for flotation 3. The shut-off gate has two horizontally located plates (disks), stacked one on top of the other, each of which has through windows. When the upper plate of the gate valve is mounted on the shaft, the combination of the windows of the plates allows access to the pulp in the chamber for preparing the pulp for flotation; when the shaft is turned to the other side, the gate closes (cuts off) the pulp stream from the loading unit. Gate control can be manual or automatic. In the chamber for preparing pulp for flotation 3, reagents are fixed on useful minerals. To maintain the solid fraction in suspension, a small amount of air is supplied through the microporous septum 6 of the aeration cassette 7 installed in the base of the chamber 3. From the chamber 3 into the flotation chamber 4, the prepared pulp enters through the gap between the wall 5 and the microporous septum 6 of the aeration cassette 7, which is regulated by a shutter. When the pulp passes through the gap, it is saturated with fine air bubbles emerging from the holes of the microporous septa of the aeration cassettes. Each cartridge can independently adjust the air supply to the flotation process. Further saturation of the pulp occurs in flotation chamber 4. Hydrophobized particles, in contact with air bubbles, form flotation complexes and are unloaded together with foam through the discharge unit for concentrate 8 by means of an adjustable valve 10. The valve device is similar to a shut-off gate device. It consists of two disks with holes, one of which, mounted on an axis, is movable. Changing the cross-sectional area of the through hole in the discs causes a change in the flow rate of the concentrate or tailings through the valve. The combination of holes in both discs corresponds to the maximum performance of the machine. Hydrophilic and non-flotated particles are removed through the tailings unloading unit 9. The pulp level in chamber 4 is maintained both by manual regulation of valve 10 and automatically.

 The application of the proposed device allows to achieve effective aeration of the entire volume of pulp, reduce flotation time, improve the quality of the concentrate, reduce energy consumption, i.e. generally intensify the flotation process.

Claims (1)

 Pneumatic flotation machine, including a pulp preparation chamber for flotation, having a common wall with a flotation chamber, the upper part of the pulp preparation chamber for flotation is associated with a smaller base of the conical part of the loading unit in which the shutter gate is installed, an aeration device installed at the base of the pulp preparation chamber for flotation, an unloading unit for concentrate located in the flotation chamber, and an unloading unit for tails, characterized in that the machine is equipped with an additional adapted the aeration device installed at the base of the flotation chamber, while the aeration devices are made in the form of cassettes with a microporous septum, the flotation chambers and preparation of pulp for flotation are communicated by means of an adjustable gap between the common wall and the microporous septum of the cassette, and the discharge unit for the concentrate has an adjustable valve , consisting of two disks with holes, one of which is mounted on an axis, is made movable, and the discharge unit for tails is located in the flotation chamber.

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