SU1748878A1 - Device for pulp aeration in flotation - Google Patents

Abstract

Use: Penna separation of minerals. SUMMARY OF THE INVENTION: A device consisting of a housing 1 with a mixing chamber, an aerator with an air nozzle formed on its axis, and a choke 7 for supplying air is provided with a soothing grate 9, a manifold 8 and additional aerators with nozzles and chambers, and the manifold 8 is connected to the choke 7, and the aerators installed on the collector 8 perpendicular to it. The grill 9 is located under the aerators and is made with the possibility of changing the installation angle relative to the plane of the aerators. The chambers are made of pulpwater channels 4. Compressed air, the output from the collector 8 to the aerators through nozzles, injects the pulp through the channels 4 into the chambers, where it mixes with them. Pulp-air mixture is directed to the grid 9, after impact on which enters the process. 3 il. SP

Description

The invention relates to the field of mineral processing, in particular, to designs of flotation machines, for example, for the foam separation of mineral raw materials.

The aerator is one of the major components of the pneumatic type flotation machines.

Perforated rubber tubes with an internal diameter of 8–10 mm and a number of punctures up to 40–60 per 1 cm2 are used as aerators in foam separation machines.

A disadvantage of the known construction of the aerator is its low operational reliability. Aerators fail due to air pressure fluctuations in the air network at the processing plant, as well as undergo stretches leading to ruptures when the load on the foam separation machines is

interruptions in the supply of recycled water. To replace an aerator that has failed, it is necessary to completely stop the machine.

The known design of the device for pneumatic-hydraulic aeration of the pulp with the combined supply of liquid and gas phase under excessive pressure, selected as a prototype. A device for aerating the pulp during flotation contains a choke for supplying air and an aerator with an air nozzle along its axis and a mixing chamber.

The disadvantages of the known construction are the slakhnost of its operation in industrial conditions of a closed water circulation associated with the need for additional purification of recycled water, the uneven saturation of the pulp with air and high energy capacity, determined by

00 00 XI 00

air and water for pressure mixing

The aim of the invention is to increase the operational reliability of a pulp aeration device while enriching slime raw materials under conditions of closed water circulation, increasing the uniformity of pulp saturation with air and reducing energy costs.

This goal is achieved by the fact that the device for pulp aeration during flotation is equipped with a soothing grate, a collector and additional aerators with air supply and blended chambers, the collector is connected to the core, the aerators are installed on the collector perpendicular to it, and the screen is sedated placed above the aerators with the possibility of changing the angle of installation relative to the plane of the location of the zr. and in the mixing chamber, radial through holes are made for the passage of the pulp. The main working medium supplied through the collector to the aerator under pressure is compressed air, which, at the exit of the working nozzle in the mixing chamber, entrains the pulp and mixes with it. The pulverized plume created by the aerator is directed onto a calming grate to evenly saturate the pulp with air bubbles. The pulp enters the dilution zone of the aerator mixing chamber through the pulpwater channels without forcing.

FIG. 1 shows the aerator and AA section; in fig. 2 - the same, top view; in fig. 3 - the same, side view

The aerator (Fig. 1) comprises a housing 1 made of a corrosion-resistant material with a thread 5 for connection to the air collector, a working nozzle 2, a mixing chamber 3 and a slurry-water channels 4, radially formed in the walls of the cylindrical mixing chamber 3 in the vacuum zone above the opening working nozzle 2.

FIG. 2 shows a top view of a pulp aeration device for flotation (from several aerators). It contains aerators connected to the air collector body 8 through adapters 6.

In Fig. 3, the device for erection is a side view (on the right). The soothing lattice 9 is installed at a certain distance from the aerator with the help of brackets 11. The angle of inclination of the soothing lattice relative to the plane of aerators is adjusted by the brackets. The required number of aerators in

the device is determined by the performance and overall dimensions of the flotomachines.

The device works as follows

Compressed air under pressure enters through the nozzle 7 (Fig 2) into the air collector 8 and through the adapter b into the aerator. At the exit of the working nozzle 2 (Fig 1), a jet of compressed air draws the pulp coming through the pulpwater channels 4 and mixes with it in the chamber 3 mixing. The dilution zone formed above the working nozzle aperture is transferred to the pulp without being forced through the pulp water channels made radially in the vacuum zone above the working nozzle opening of the mixing chamber. Pulp-air mixture is directed to a calming grate 9 (FIG. 3) with holes 6. Angle

0 installation of the stilling grate relative to the plane of aerators for uniform saturation of the pulp with air bubbles is regulated by brackets 11

5Example Flotation device

tested in foam foam separation machines FPS-16 to enrich the coarse-grained (up to 3 mm) coal slimes.

The case of the aerator is made of bronze,

0 nozzle diameter 1-1.2 mm, pulp channel diameter 4 mm, mixing chamber diameter 8 mm. Air is supplied under a pressure of 300 -4W kPa.

Aerator set

5 at a depth of 0.8 m from the pulp level in the foam separation machine chamber. Aerators are horizontal with respect to the pulp surface mirror. Soothing grille has holes

0 5x20 mm.

The experiments were carried out for 1 month of continuous work. Tests of the new aerator showed that it, in contrast to the rubber aerators operating in the factory, is insensitive to changes in air pressure, fluctuations in pulp density and load, after stopping the machine can turn on under load. The quality of the foam product with the new aerator does not differ from that for rubber aerators. This made it possible to conclude that it is possible to replace rubber aerators, which are often out of order, for operationally more reliable new aerators.

5 At the same time, an attempt was made to use pneumatic-hydraulic aerators to supply water and air under pressure. Due to the shortage at the factory of tap water, testing of aerators was carried out on circulating water. but

due to the presence of suspended solids in the circulating water, the aerators were clogged, which required stopping the machine. Therefore, they were refused further tests, since deep purification of circulating water required a significant complication of the scheme

Thus, the proposed device is operationally more reliable than the known. The presence of a soothing grate contributes to a more uniform pulp aeration. In addition, since no forced water or pulp supply is required, the device is less energy-intensive.

Claims (1)

Apparatus of the Invention A device for aerating the pulp during flotation, including a choke for supplying air and an aerator with Axis air nozzle and mixing chamber, characterized in that, in order to increase operational reliability when enriching slime raw materials, in conditions of closed water circulation, uniformity of pulp saturation with air and reduce energy costs, it is equipped with a soothing grille, a collector and additional aerators with air nozzles and mixing chambers, while the collector is connected to its nozzle, aerators are installed perpendicular to it on the collector, a soothing grate is placed above the aerators with the possibility of changing the installation angle relative to the aerator positioning plane, and pulpwater channels are made in the mixing chamber of each aerator Liquid / eight / oshosh / f OOD001 Azriro Bullets figure 1 Air ; Azirovanna pulp 1