DD146738A3 - METHOD FOR FLOTING MINERAL RAW MATERIALS - Google Patents

Abstract

The invention relates to the field of processing ores, coal, potash minerals, non-metallic minerals and other mineral raw materials by foam floatation. The invention overcomes the disadvantages of the known technical solutions with conventional air supply in the case of foam floatation such as low crucibles & only 30 to 40% solids & unsatisfactory coarse particle flotation, high reagent, energy and investment per tonne throughput, through a intermittent air flotation process. The flotation time consists of a periodic change of normal air supply and locked or heavily throttled air access. At the moment of the fault of the air there is a 2-phase system in which the dispersion of the solid is significantly improved. Through these types of air supply, a successful flotation is possible even with an increase in the solids content of Truebe up to twice the usual solids content. The process is suitable for all stirred tube flotation machines used in practice.

Description

Title of the invention: Method for flotation of mineral

raw materials

Field of application of the invention:

The invention relates to a process for the treatment of ores, coal, non-metallic mineral resources and other minerauschen raw materials by foam flotation · In many deposits with over years progressive degradation, the ore content of the material obtained is lower. Increasingly, there is also an increasing interest in available large deposits of poor ores as the demand for increased extraction of metals increases. There is a real need for increased capacity of treatment plants · High throughputs are desirable for processing rich mineral deposits ·

Characteristic of the known technical solutions:

In the known flotation with self-priming air supply or forced ventilation of the flotation apparatus is the. amount of air supplied during the flotation process is constant ·

11. AFR. 19 7 7 ^ Ii: 2 7 J. Vi "

Schubert, H .: preparation of solid mineral raw materials,

Volume 1,2,3; VEB German publishing house for. Basic Industry, Leipzig ,. 23rd edition 1967, 1974

Gaudin, A .: Flotation, Second Edition, McCraw-Hill BOOK Company, New York, 1957

Founder, W .: Preparation client, Hermann Hübner Verlag 1965, Goslar

Mitrofanov, S .: Selektivnaya Flotacija, Nedra, Moskva 1967

Sutherland, K. and Wark, I.? Principles of flotation,

Melbourne 1955

Spravocnik po obogasceniju rud, Moskva 1972, volume 1,2,3 »4

Classes, V .; Mokrousovj Uvedenie ν teorija flotacii,

Moskva 1959. ,

Plaksin, 1.1 Glembocky; Klassen, V .: Flotacija, Moskva 1971 Glembockij; Classes, V .: Flotacija, Moskva 1973

The flotation pulp is a three-phase system (solid-liquid-gas) throughout the flotation process. The ridiculous parts of this method of foam flotation with constant air supply are:

- low cloud density (only 30 - 40 % solids content)

- unsatisfactory flotation of coarse particles

- high energy consumption per t throughput

- relatively high reagent requirement per t throughput

- high investment requirement per t throughput

Object of the invention.

The aim of the invention is to use the flotation plants for mineral raw materials more effectively, to save investment funds on a large scale and to strengthen the raw material base.

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Explanation of the essence of the invention

The invention is based on the object of describing a process for the flotation of mineral raw materials, with which it is possible to increase the throughput of the amount of pesticides without lengthening the flotation time. The aim is to improve the flotation of the solids while reducing the energy requirement and reagent consumption.

This object is achieved in that the expiration of the flotation process takes place with intermittent addition of air. The flotation time consists of a periodic change between normal air supply and blocked air access. When the air supply is dispersed by the stirring system it forms a three-phase mixture. The air supply is necessary for the flotation process - but it interferes with the dispersion of the solid. This limits the amount of solids in the pulp.

At the moment of lack of air there is a two-phase system in which the dispersion of the solid is significantly improved. The hydrodynamics of the process is greatly altered, the circulation in the flotation apparatus is ensured even at double turbidity density.

With renewed air supply part of the material floats due to the contact between solid particles and air bubbles · Without this pulsating air supply at higher than the usual cloud density at normal flotation so sufficient but constant addition of air into the pulp - no flotation possible because the individual cells of the flotation due to the insufficient turbulence of the particulate matter would sand very quickly.

This pulsating air supply allows a successful flotation with increasing the cloud density to 1.5 to 2 times the usual cloud density.

Execution game!

On an exemplary embodiment, the invention will be explained in more detail.

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Las procedure is carried out as follows:

The pulp, which is provided with the correspondingly high proportion of solids, is fed to the flotation flask as usual and the corresponding flotation reagents are added. The air for the flotation passes through a control valve in the form of a pulsating air flow into the flotation cells. The method has been experimentally confirmed on a feldspar quartz raw material and a tin-arsenic hearth mix concentrate. It has been shown that with the same flotation time and the same treatment success, the cloud density by 1.5 to 2 times larger and. while the reagent consumption was 1.5 times lower. On the other hand, much coarser solid particles than in normal Schaumflotation get into the concentrate. In the further development of the method is also worked so that periods of normal .Alzufuhr alternate with those of greatly reduced air supply. , The table shows these experimental technological results with intermittent air supply. The diagram shows the experimental data of power consumption in a 100 l flotation cell. Herein, curves 4 and 5 denote the power consumption of the rotor at 6,000 l / h and 12,000 l / h at a constant air supply and at a varied speed in accordance with the requirement that the solid is still sufficiently dispersed. Curve 3 shows the power requirement without air supply at constant speed, which was sufficient, however, that the solid was dispersed even at high cloud density. The curves 1 and 2 show the greatly reduced power requirement with intermittent air supply and constant speed as in curve 3 during flotation (curve 1 12000 lh " ¹ , curve 2 6000 Lh" ¹ ).

The method has been proven in the following flotation machines. Show it

, Fig. 1 shows a device for carrying out the method

with forced ventilation, Fig. 2 shows a device without additional air.

-5- 196473

According to FIG. 1, the plotting machine 1 is equipped with a control valve 2 on the central air supply line 3 with control unit 4 and a compressor 5.

For plotting machines with self-priming air supply without additional air, the method is equally applicable (Figure 2). The central tube is to be sealed and attached to the respective intake of the flotation cells a control valve, which ensures the intermittent.Air supply by a central control unit.

Test results with intermittent addition of air

Test material: Feldspar, 1 - 0.063 mm

cloudy Laboratory experiment Laboratory experiment Laboratory experiment Laboratory experiment halbteohn.Versucl 100 1-cell hai btechn. Verse ucl 100-1 cell Task J [ Mass % deduction I Ausbr. % Mass % task Dimensions Go to.,? » salary I RücksiancT " O mm Output % Residue ace sn % As Sn. Mass % deduction Ausbr. % Mass % - propose density ^ / 1 Feldspar content % 25,27 29,26 30,83 31,09 28,05 25,41 Feldspar content % 96,89 88,48 97,61 91,12 94,66 89,1o 70.74 69.17 68.91 71.95 74.59 Salary content % "As Sn Feldspar content % 3,11 11,52 2,39 8,88 5,34 10,90 Spend mass content 41.80 0.24 96.84. * 27, 36, 51, 23, 32, 23.73 Feldspar content % 81.17 76.27 Residue As. sn 585 585 617 667 500 700 24, oo 30.75 29.06 31.05 1 26.96 1 27.36 92, oo 93, oo 92, oo 91, oo 91, oo 96, oo. Test material: arsenopyrite Sn hearth mix concentrate, 0,6 - As Sn 63.49 1, oo 5, oo 1, oo 4, oo 2, oo 4, oo * Comparative experiment with constant addition of air 97, o Feldspar content %. 40 3.16 98.73 27.70 11.98 task 7, oo Feldspar content % 28.36 Output % Laboratory test 18.83 400 Laboratory test 340

Claims (1)

invention claim Process for the treatment of mineral raw materials in a foam flotation process in forced-air stirred or self-priming air-flow stirring machines wherein the raw materials together with water and reagents are applied to a flotation cell and dispersed with air, characterized in that the air is intermittently fed to the flotation cell the air supply is either completely interrupted or greatly reduced at time intervals. Here are some tables For this ^ ropes drawings