SU1697888A2 - Pneumatic flotation machine - Google Patents

Abstract

This invention relates to mineral processing by flotation. The goal is to increase the performance of the flotation process due to the stabilization of the pulp level with a change in its degree of aeration. In the upper part of the vertical cylindrical chamber (CC) 1 with the bottom 2, the loading device (P) 3 is located. hole 6. Under the LD 5 to the hole 6 a large base is attached down a conical nozzle 7, into which is placed a float 8 made in the form of a ball and forming an annular gap 9 with the walls of the nozzle 7 An additional float 11 placed above the aerator 4 using a rod 12 Pop Auxi8 and 11 are fastened by a rod 12, have total positive buoyancy. Directly below LD 5 is an inlet 13 P 14 for unloading tails fitted in the upper part with a gate 15 Inside K 1 at several points in height on the brackets 16 dynamic dampers 17 1 where aerated by air bubbles The flotation complexes float up and are removed in P 18 The unplanted part of the pulp passes through aperture 6, a gap 9 and an air gap 13 in P 14, from where it is removed from the machine. of similar pulp or its aeration, the floats 8 and 11 change their position in K 1, thereby changing the size of the cross-section of the gap 9.

Description

The invention relates to the mineral processing by flotation and can be used in the processing of ore or non-metallic raw materials.

The purpose of the invention is to increase the performance of the flotation process due to the stabilization of the level of the pulp with a change in the degree of its aeration

Figure 1 shows a pneumatic flotation machine, a frontal incision. Fig 2 - element of the false bottom of the flotation machine

The machine contains a cylindrical vertical chamber 1 with a bottom 2. In the upper part of chamber 1 there is an accessory 3. In the lower part of chamber 1 there is an aerator 4 made in the form of tubular dispersants placed along its perimeter. Under the aerator 4 there is a false bottom 5 with a prototy hole 6, made in its center

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Under the false bottom 5, a conical nozzle 7 is attached to the hole b with a large base, in which a float 8 is placed, made in the form of a ball and forming an annular gap 9 with the walls of the conical nozzle 7 for the passage of the pulp. At the upper and lower ends of the pipe 7, Yuzizheni float 8 stops are fixed, preventing it from exiting the conical pipe 7. Inside the chamber 1 under the aerator 4 an additional larger float 11 is placed, made in the form of a ball and rigidly connected to the float 8 by means of a rod 12, The floats 8 and 11, fastened by the rod 12, have a total positive buoyancy, while their common metacenter is located above their center of gravity.

The lower end of the nozzle 7 is located below the layer of sediment of the solid phase falling out of the pulp when the flotation machine stops. Immediately under the false bottom 5 in the chamber wall there is an inlet 13 of the device 14 for unloading tailings provided in the upper part with a gate 15 to adjust the level of the pulp in chamber 1 Inside the chamber 1 at several points in height on the brackets 16 are located dynamic dampers 17. In the upper part of the chamber 1 above the charging device 3 there is a collection tool 18.

The machine works as follows.

The pulp, treated with reagents, through the device 3 enters the upper part of chamber 1, where it is aerated by air bubbles coming from the aerator 4. Flotocomplexes formed by the contact of mineral particles with bubbles, float to the surface of the pulp, where they form a layer of foam that is removed into the collecting device 18. The non-floated part of the pulp enters the lower part of the chamber 1 and, the passage through the flow-through opening 6 of the false bottom 5 and the annular gap 9 forms an annular submerged jet that prevents sedimentation t phase of the chamber bottom 1. Next, the pulp through the inlet 13 is removed to the tool 14 and, overflowing through the gate 15, is withdrawn from the machine. Dynamic dampers 17 contribute to a significant decrease in the intensity of the longitudinal

mixing. When the chamber product passes through the flow hole 6 on the false bottom 5, a pressure differential is created, defined by the frontal section of the float 8 and the magnitudes of the forces applied

to floats 8 and 11. With an increase in the pulp flow rate in the feed of the flotation machine and, accordingly, the flow rate of the chamber product through the flow-through openings 6 on the false bottom 5, the pressure drop increases and the equilibrium condition of the floats 8 and 11 is violated. The floats start to drop down, increasing the section of the annular gap 9, which leads to a decrease in the pressure drop on the false bottom 5 and, accordingly, the force

attached to the float 8 and pointing down. The floats 8 and 11 are lowered down until the pressure drop across the false bottom 5 takes the initial value.

By reducing the pulp consumption in the feed, the float 8 rises, the gap 9 decreases and the pressure drop on the bottom 5 is restored, which leads to a change in the position of the floats 8 and 11 and, consequently, to a pressure drop on the bottom 5.

All movements of the floats 8 and 11 ensure the stabilization of the level of pulp in chamber 1 with changes in the flow rate of the original feed and the degree of air erosion.

pulp.

Claims (1)

The initial level of the pulp in chamber 1 is determined by the position of the gate 15. Invention formula Air-driven flotation machine according to ed. USSR Ms 1609509, characterized in that, in order to increase the performance of the flotation process by stabilizing the level of pulp when its degree of aeration is changed, the machine is equipped with an additional float placed in the chamber above the aerator and rigidly connected by means of a rod with a float conical nozzle, and the floats with a rod have total positive buoyancy. Concentrate Nutrition / XJ / 5 P/ t Chamber product 1