FI65390C - FLOTATIONSFOERFARANDE OCH -ANORDNING FOER MINERALRAOAEMNEN - Google Patents

Abstract

The present invention provides a method of treating mineral raw materials by a foam flotation process wherein the raw materials are admitted into flotation cells with flotation reagents, and an intermittent pulsating supply of air is fed to said flotation cells.

Description

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German Democratic Republic-Democratic Republic of Germany (DD) WP 1961 + 73 Proof-Styrkt (71) Akademie der Wissenschaften der DDR, Rudower Chaussee 5> 1199 Berlin, German Democratic Republic-Democratic Republic of Germany (DD) (72) Rumen Warban , Dobrin Nikolov, Sofia, Bulgaria-Bulgarian (BG), Ulrich Bilsing, Freiberg, Heinz Weber, Freiberg, Manfred Schmidt, Freiberg, German Democratic Republic of Germany (DD) (7I +) Leitzinger Oy (5I +) Foaming of mineral raw materials . and equipment r-Flotationsförfarande och -anordning för raineralräämnen

The invention relates to a method and an apparatus for treating mineral raw materials by flotation in a flotation cell equipped with a mixing device, which uses aeration based on external compressed air and self-priming air, whereby the raw materials are brought into the flotation cell together with water and reagents.

In many ore deposits, the ore content of the recovered material decreases over the years. There is also a growing interest in low-ore, usable large deposits as the need for metal mining increases. Thus, there is a real need to increase the capacity of enrichment plants. Large capacities are also desirable in the processing of rich ore deposits.

In known flotation methods, which use the self-priming air supply or side aeration of the flotation device, the amount of air supplied is constant during the flotation process.

2 65390

Schubert, H .: Aufbereitung fester mineralischer Rohstoffe, Band 1,2,3? VEB Deutshcer Verlag fiir Grundstoff-industrie, Leipzig, 23. Auflage 1967, 1974

Gaudin, A .: Flotation, Second Edition, Me Graw-Hill Book

Company, New York, 1957

Grtinder, W .: Aufbereitungskunde, Hermann Hiibner Verlad 1965,

Goslar

Mitrofanov, S .: Selective Flotation, Nedra, Moscow 1967 Sutherland, K.

and Wark, I .: Principles of Flotation, Melbourne 1955

Spravocnik po obogasceniju Rud, Moscow 1972, Band 1,2,3,4

Klassen, V .: Mokrousov: Uvedenie v teoriju flotacii, Moskva 1959

Plaskin, I .: Glambockij; Klassen, V .: Fltacija, Moscow 1971

Gelmbockij? Klassen, V .: Flotation, Moscow 1973

The concentrator includes several sequentially connected mechanical mixing tanks and auxiliaries (reagent dosing samples and reaction vessels). The flotation slurry passes smoothly through the cells and is a three-phase system (solid-liquid-gaseous) throughout the flotation process.

The disadvantages of this flotation method, which has a constant air supply, are: - low sludge density (dry matter content only 30-40%) - unsatisfactory flotation of important particles - high energy demand per tonne of production - relatively high reagent requirement per tonne of production - high investment requirement per 90 tonnes

OBJECT OF THE INVENTION:

The object of the invention is to make more efficient use of mineral raw material concentrators, save a lot of investment costs and strengthen the raw material base.

It is an object of the invention to provide a method and apparatus for flotation of mineral raw materials, by means of which it is possible to increase the production volume of solids without prolonging the flotation time. Its goal is to improve solids synchronization while reducing energy requirements and reagent usage.

This object is achieved according to the invention by introducing air into the flotation cell periodically, whereby the supply of air is either completely cut off from time to time or is greatly reduced. The flotation time consists of a periodic variation between the normal air supply and the blocked air supply. When air is supplied, the mixing system performs the dispersion - a three-phase mixture is formed. The air supply is essential for the flotation process - however, it interferes with the dispersion of the solid. The amount of solid in the slurry is thus limited.

At the moment when no air is supplied, there is a two-phase system in which the dispersion of the solid is clearly improved. The hydrodynamics of the process change strongly. Circulation in the flotation device is also guaranteed when the density of the slurry is double.

When air is re-introduced, some of the material foams due to the contact between the solid particles and the air bubbles. Without this pulsed air supply, flotation would not be possible at all with higher slurry densities under normal flotation conditions, i.e. when the air supply to the slurry is sufficient but remains constant because the individual cells in the flotation line clog very quickly due to insufficient vortexing of solids. The intermittent air supply is achieved by having a shut-off member in the air supply pipe 4 65390, which is operated by means of a control device according to a raw material-dependent, predetermined pulsation characteristic. This pulsating air supply allows for successful flotation when the density of the sludge is increased 1.5-2 times that of a conventional sludge.

The following embodiment further illustrates the invention:

A slurry with a correspondingly higher amount of solids is fed to the flotation machine in the usual manner and the corresponding flotation reagents are added. The flotation air enters the flotation cells via a control valve as a pulsating air flow. The method has been experimentally validated with feldspar-quartz raw material and tin-arsenic-pyrite-rinse alloy concentrate. It turned out that when the flotation time and the enrichment event were the same, the density of the slurry was 1.5 to 2 times higher and at the same time the use of the reagent was about 1.5 times lower. In addition, substantially coarser solid particles end up in the concentrate than in normal flotation. The method can also be carried out in such a way that the periods of the normal air supply vary with the periods in which the air supply is greatly reduced.

The table shows these experimental technical results after the air supply has been intermittent. The diagram shows the power demand test results in a 100 liter flotation cell. Curves 4 and 5 denote the power requirement of the rotors when the air supply is kept at a constant value of 6000 l.h "* or 12000 l.h" "1, and the variable speed corresponds to the requirement that the solid is still sufficiently dispersed. Curve 3 shows the power demand without air supply and at a constant speed, which, however, was sufficient to disperse the solid even when the slurry density was high. Curves 1 and 2 show a greatly reduced power requirement when the air supply was intermittent and at the same constant speed as in curve 3 during flotation. (Curve 1 12000 l.h ”'·' ·, curve 2 6000 l.h” · * ·).

The method is implemented in the following flotation cells.

5,65390

Figure 1 shows an apparatus for carrying out the method using additional aeration.

Figure 2 shows a device in which no additional aeration is used.

In Fig. 1, the flotation cell 1 is provided with a shut-off or reduction valve 2 in the central air supply line 3, both with a time-switching device 4 and a compressor 5.

The method can also be used in flotation devices with a self-priming air supply and no additional air is used (Figure 2). There is no central pipe, and a shut-off or reduction valve is installed in these suction connections of the flotation cells, which ensures a periodic air supply by means of a central time switch device.

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