RU2351400C2 - Method of flotation of barite containing ores - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention refers to flotation concentration of minerals and can be used at processing of barite containing ores. The method includes preliminary treatment of pulp with regulator of pH-medium, with depressor, with a fat acid collector in form of the mixture of modified soap stock, fat tall acids and Asparal F, and flotation with above said collector. Preliminary water preparation is performed before flotation, it consists in softening re-circulated water with lime and soda, in sedimentation by method of decantation and in separating water from the produced sediment, and in introducing H₂SO₄ into softened water. The mixture of modified soap stock, fat tall acids and Asparal F is introduced in form of uniform solution at the ratio of 1:1:0.2.

EFFECT: increased efficiency of flotation.

1 dwg, 2 ex, 1 tbl

Description

The invention relates to flotation concentration of minerals and can be used in the processing of barite-containing ores.

A known method of flotation of barite-containing ores using as a collector a mixture of fatty acid collectors and reagent C-90. The S-90 reagent includes technical higher alkyl sulphates, obtained on the basis of bottoms VSZh S10-C18, as well as 5.5% of unrefined alcohols and 0.1% polyalkylbenzosulfanates (A.V. Selivanova, T.A. Trifonova, G .L. Ovsyannikova, E.L. Tropman. Non-ferrous metals, 1999, No. 3, pp. 8-11).

The disadvantage of this method is not a high recovery of barite.

Also known is a method of flotation of barite-containing ores, where oleic acid is used as a barite collector, liquid glass serves as a depressant, and soda ash is used to regulate the pH of the medium. (Handbook of ore dressing. Main processes. - M .: Nedra, 1983, p. 359).

This method does not allow to obtain sufficiently high rates for the extraction of barite.

The closest in technical essence to the proposed solution and taken as a prototype is a method for flotation of barite-containing ores, in which a mixture of soap stock, tall oil fatty acids and Asparal “F” is used as a barite collector in a ratio of 0.75: 1: 0.1; liquid glass is the depressor (Patent of the Russian Federation 2182042, IPC 7 B03D 1/02, Method for flotation of barite-containing ores / Bogidaev S.A., Adelman V.L., Litvinenko N.G., Uvarov E.A .; applicant and patent holder Ir. .techn.un-t. - No.2000117882 / 03; application 05.07.00; publ. 10.05.02, Bull. No. 13).

Using this method allows to obtain a fairly high rate of recovery of barite (about 90-91%) with a low content in concentrate (53.36%) due to the lack of selectivity of the collector.

The objective of the invention is to improve the quality of the resulting barite concentrate and increase the selective and collecting properties of the collector.

The problem is solved by achieving a technical result, which consists in optimizing the flotation process and improving the conditions for the preparation of the reagent.

The technical result is achieved by the fact that in the method of flotation of barite-containing ores, which includes pretreatment of the pulp with a pH regulator, a depressor, a fatty acid collector in the form of a mixture of modified soap stock, tall oil fatty acids and Asparral “F”, flotation with the specified collector, according to the invention, before by flotation, preliminary water treatment is carried out, which consists in softening the circulating water with lime and soda, settling by decantation and separating the water from the precipitate formed, introducing into the umyag water H ₂ SO ₄ , while the mixture of modified soap stock, tall oil fatty acids and Asparal "F" is introduced in the form of a uniform solution in a ratio of 1: 1: 0.2

The essence of the method is as follows.

Preliminary water treatment, which consists in softening the circulating water with lime and soda, the conditions for preparing a fatty acid collector (a mixture of modified soap stock, tall oil fatty acids and Asparral “F”) and feeding it into the flotation process in the form of a uniform solution in the ratio 1: 1: 0, 2 create the conditions for more efficient flotation, thereby allowing to increase the quality of the concentrate. The cooking conditions for the fatty acid collector make it possible to increase its selective and collecting properties.

Solid soap stock (hereinafter referred to as “Dulles”) is a light brown to brown solid, the mass fraction of total fat to Dulles is not less than 53-80%, the mass fraction of free alkali to Dulles is not less than 1 -1.4%, mass fraction of moisture not more than 15-42%, pH 8.0-8.5.

Fatty tall acids (hereinafter referred to as BT-1C) are a jelly-like product without mechanical impurities; yellow color with various shades; acid number, mg / g KOH per 1 g of product not less than 185; iodine number, g Y / 100 g of product not less than 150; mass fraction of resin acids,% no more than 3, mass fraction of unsaponifiable substances no more than 5%.

Asparal "F" - tetrasodium salt of N-H-octadecyl-N-sulfosuccinicinoyl aspartic acid, the content of the basic substance is not less than 36%, the content of free sodium hydroxide is 0.5-1%.

Using as a collector (reagent KR-1) a mixture of "Dulles", BT-1C and Asparal "F" in a ratio of 1: 1: 0.2, as well as the conditions for its preparation, distinguish the proposed solution from the prototype and determine the compliance of the proposed proposal with the criterion " novelty". In addition, the use of preliminary water treatment in the flotation process of barite also meets the criterion of novelty.

No technical solutions have been identified from the prior art that have features matching the distinguishing features of the present invention, therefore, it can be considered that the proposed technical solution meets the criterion of "inventive step"

The method is illustrated by the following examples.

Example 1. The proposed method

To soften three liters of circulating water, 0.25 g of lime and 2.3 g of soda are fed (pH is 11.05-11.0). After daily sedimentation by decantation, water is separated from the precipitate formed. H ₂ SO ₄ is introduced into softened water based on its consumption in the amount of 0.129 mg per 1 liter of water and the pH decreases from the initial value of 11.6 to 9.8.

The initial sample of ore with a particle size of minus 2 + 0 mm is ground in a mill to 75% grade minus 0.074 mm.

The flotation scheme provides for fractional supply of the reagent and, as a consequence, the division of the main flotation into two stages, followed by the combination of concentrates and their two successive flotation processors. In addition, the scheme includes control flotation, the concentrate of which is returned to the first stage of the main flotation. At the same time, 45% of the collector KR-1 is supplied to the first stage of the main flotation, 30% to the second, 25% to the control.

The main time (I and II stages) and control flotation operations for 5 min for each; length of cleanings - 6 min each.

Pulp density W: T = 3: 1, flotation pulp temperature 21-22 ° C. The duration of mixing the pulp with the collector was 3 minutes

Alkalinity regulator is soda ash pulp, pulp pH 9.5-10.5, depressor - water glass (10% ^th), the duration of agitation - 2 min.

As a collector, a mixture is used, the optimal costs of components per one metric ton of the initial feed of barite flotation are:

Dulles 190 g / t (natural);

BT-1S 190 g / t (natural);

Asparal "F" 38 g / t (100% activity).

Conditions for the preparation of the KP-1 reagent: initially, Dulles was dissolved in the water heated to a temperature of 50-60 ° C with good stirring provided by a mechanical stirrer and maintaining the indicated temperature until its visible particles completely disappeared. An equivalent by mass amount of BT-1C was introduced into the resulting Dulles solution with short-term stirring of the mixture, and Asparal "F" was added to the resulting suspension in the required amounts, followed by short-term (1-2 min) final stirring. Flotation was supplied as a uniform 3% solution.

The results of the experiment are presented in the table.

Example 2. Prototype

The initial sample of ore with a particle size of minus 20 + 0 mm was ground in a mill to 50% of the class - 0.074 mm, pulp density W: T - 3: 1. Soda ash with a flow rate of 1.5 kg / t to a pH of 9.0 was added to the pulp as a regulator of the alkalinity of the medium; a liquid glass solution with a flow rate of 500 g / t was used as a depressant. After 3 minutes of agitation, 60% of the collector reagent mixture was added. The main flotation was carried out for 2 min, then the control was carried out, with the addition of 40% of the collector. After 2 minutes control flotation was stopped, the control flotation concentrate was cleaned for 1 min.

As a collector, we used a mixture of three reagents (modified solid soap stock (Dulles), tall oil fatty acids (BT-1C) and Asparal "F"), with a ratio of 0.75: 1: 0.1, respectively, the optimal costs of which one metric ton of the initial feed of barite flotation at this ratio amounted to:

Dulles 150 g / t (natural);

BT-1S 200 g / t (natural);

Asparal "F" 20 g / t (100% activity).

The results of the experiment are presented in the table.

Analysis of the data obtained by flotation according to the proposed method in comparison with the prototype shows that the concentrates obtained by flotation are characterized by a significantly higher barite content in the concentrate (from 53.36% to 95.81%). In addition, the inventive method allows to increase the extraction of barite from 90.91% to 97.26%.

The inventive method is tested in laboratory conditions, which were carried out according to the scheme shown in the drawing.

The results obtained in laboratory conditions were confirmed in the course of semi-industrial tests, which proved its industrial applicability.

Claims (1)

A flotation method for barite-containing ores, including pretreatment of the pulp with a pH regulator, a depressant, a fatty acid collector in the form of a mixture of modified soap stock, tall oil acids and Asparral “F”, flotation with the specified collector, characterized in that prior to flotation, they are pretreated, which consists in circulating water softening lime and soda, upholding by decantation and the water separated from the precipitate formed, in introducing softened water H ₂ SO _4, the mixture was modifitsirova Nogo soapstock, tall oil fatty acids and Asparala "F" is introduced as a homogeneous solution at a ratio of 1: 1: 0.2.

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