Concentration of nonferrous metal ores

FIELD: metallurgy.

SUBSTANCE: invention relates to concentration of minerals and can be used to increase the yield of valuable products, particularly, zinc and lead, by flotation. Proposed method comprises flotation, processing of pulp-bearing solution by pulse discharges and precipitation of solid phase. Processing of pulp-bearing solution is carried out by pulsed high-voltage discharges of specific energy of 8.6-11.2 kJ/dm3 fed directly into pipeline communicating flotation machine with settle-thickener. Action of pulsed high-voltage discharges is brought about provided that: R/Ro=10.4 where: R is the radius of efficient wave effects; Ro is the spacing between electrodes and R.

EFFECT: higher intensity and rate of deposition of disperse particles from foam after flotation.

2 cl, 3 dwg, 1 tbl

 

The invention relates to processes for ore minerals and can be used to increase the completeness of extraction of valuable products, in particular zinc and lead, by flotation.

A known method of cleaning and sterilization of liquid or gaseous media by treating them with a pulsed high voltage discharges, generating UV radiation (RF patent No. 2326820, C02F 1/467, 20.06.2008).

When the surface of the water jet moving high-voltage discharge narrowing stream into tiny droplets, the droplets of water and stream-water interface under the action of hard UV radiation generated in the active particles. Cleaning and sterilization of the processed media is the result of the combined effect of organic and biological pollutants, UV radiation and active radical particles. The direct effect of UV radiation leads to a rapid destruction of bacteria and viruses and causes the degradation of molecules of organic pollutants.

However, the performance when using this method is low because water is for cleaning a trickle. The hollow configuration of the electrodes creates a risk of clogging of the tube to form a thin water jet, which makes the used electrodes are unsuitable. In addition, the process requires additional equipment is equipment, that leads to an increase in capital expenditures.

Closest to the claimed technical solution to the technical essence and the achieved technical result is a method of enrichment of sulfide siderastrea ores (RF patent No. 2123885, WV 7/00, 27.12.1998). Pre-processing of sulphide siderastrea ores is carried out in the pulp by electrical explosion in energy density between 50 and 150 kJ/DM3. Then the pulp is subjected to magnetic separation and flotation. Under certain modes electroexplosive processing by a complex bit and PokerTracker phenomena siderite contained in the original ore, decomposes and turns into selfnominate form.

The described method is taken as a prototype of the invention.

The disadvantages of the prototype:

- high energy costs compared with the proposed method (50-150 kJ/DM3);

- the need for additional equipment in the form of a contact tank, where the electrode system and is blasting treatment;

- the need for additional security measures through the use of high energy impacts.

The technical task of the present invention is to increase the intensity and speed of sedimentation of dispersed particles of the foam after flotation machines and improving the quality of purified solution

This is achieved by the fact that in the proposed method, enrichment of ores of non-ferrous metals, including flotation, pre-processing pulpotomies solution of pulsed high voltage discharges and further sedimentation of the solid phase, according to the invention pre-processing pulpotomies solution is performed in a pulsed high-voltage discharge with a specific energy of 8.6-11.2 kJ/DM3served directly in the pipe connecting the flotation machine with a clarifier-thickener.

The influence of pulsed high-voltage discharge is executed under the condition

R/Ro=10,4,

where R is the radius of the effective impact of the waves;

Ro- the distance between the electrodes and R.

When pulsed high-voltage discharge occurs directly in the pipeline connecting the flotation machine with a clarifier-thickener, without using any intermediate additional capacitances pin type Chan.

The essence of the proposed method consists in the following. In the flotation get concentrated product and pulpotomies solution. Then, the solution through the line enters the clarifier-thickener. Treatment of a solution of a pulsed high-voltage discharge occurs directly in the pipeline. This allows the process in ararauna hydrodynamic mode, unlike the prototype, where blasting treatment is carried out in a stationary mode, in the contact tank with an electrode system.

Generated pulsed high voltage discharges the wave front leads the processed medium in a complex stress state with the active participation of as waves of compression, depending on the energy parameters of the pulse and wave strain, which depends on the geometric characteristics of the site - the distance between the electrodes Roand the effective radius of influence of waves of R. By experiment it was proved that the radii are related by the ratio R/Ro=10,4. As can be seen from the graph shown in figure 1, the maximum pressure on the front of the direct wave (PM1the non-linear increases with increasing specific energy processing, and the maximum value of the pressure of the reflected wave (Rm2) stabilizes at energies of 8.6-11.2 kJ/DM3. The study of the influence of the density of the medium on the resulting pressure showed that increasing the density to ρ=1.26 g/cm3that corresponds to the density of the pulp T:W=1:3, there is an increase in pressure of the shock wave, and when the ratio R/Ro>10.4 pressure begins to fall, the coagulation of the dispersed particles is deteriorating.

Therefore, the practical use of shock waves in a pulsed high-voltage discharge is most effective when R/Ro/sub> =10,4. This allows to determine the optimal R.

Thus, in contrast to the method adopted for the prototype, it is possible to determine the optimal diameter of the pipeline taking into account the calculated effective radius of influence of shock waves, in which the blasting treatment will be carried out in the most effective manner.

When the ratio of T:W 1:3 the optimal distance R is 10-12,5 mm (figure 2). Therefore, the optimum diameter of the pipeline - 25 mm

The influence of pulsed high-voltage discharge significantly reduces the electrokinetic potential of the particles. This is crucial from the viewpoint of the coagulation of dispersed particles. From the diagram shown in figure 3, it is seen that the potential reaches the value (7-9 mV)is significantly less than the limit threshold coagulation (30 mV), which improves the coagulation of particles and their subsequent deposition. It was established experimentally that the most intensive coagulation and precipitation of particles was observed in the case of exposure to the solution before it is lightening pulsed high-voltage discharge with a specific energy of 8.6-11.2 kJ/DM3(table).

Thus, under these conditions, the electrokinetic potential of the particles due to the processing pulpotomies solution pulsed high voltage discharges in the specific energy of 8.6-11.2 kJ/DM3reaches led the ranks 7-9 mV, which leads to the acceleration of the process of sedimentation of dispersed particles.

At such energies processing the completeness of extraction of valuable components maximum, and product loss with the clarified solution is minimal.

An example implementation of the method.

The original sample contained, %: Pb - 4,07; Zn is 0.5; Cu - 0,17; Fe - 27,5; SiO2- 33,32; Al2O3- 2,96; CaO - 1,86; Mn - 1,66.

The required fineness of 75% of class 0,074 was achieved by grinding in a laboratory rod mill at a ratio of T:W:s=1:0,8:4,8.

The weight - 250, the grinding Time is 40 min flotation Time - 10 minutes

Mode flotation: soda (900 g/t, tto=1 min); sodium sulfide (30 g/t, tto=1 min); butyl xanthate (90 g/t, tto=2 min); pine oil (60 g/t, tto=1 min).

Flotation was carried out in a flotation machine 1 liter at a concentration of solids of 25%. The water temperature is 18°C.

Next pulpotomies the solution was subjected to processing by pulsed discharges energy from 3.4 to 16.5 kJ/DM3. The distance between the electrodes was 12.5 mm, While the categories were filed directly in the pipe connecting the flotation machine with a clarifier-thickener. The pipe diameter is 25 mm, Then the solution was sent to a clarifier-thickener, which made its separation into solid and liquid phases under the action of gravity, and determined the effectiveness of OTS is ivania. The results of the experiment are given in the table.

Table
The dependence of the content of the solid product in the clarified solution from the energy of the pulse high-voltage discharge
Specific discharge energy, kJ/DM303,46,08,69,211,2the 13.416,5
The solids content of the product in the clarified solution, mg/DM335850,914,61015

Experimental data show that the increase in pulse energy over 8.6-11.2 kJ/DM3leads to pereseleniu particles, deterioration in their aggregation and subsequent sedimentation. The influence of pulse energy, the smaller the 8.6-11.2 kJ/DM3not able to reduce the electrokinetic potential of the particles to below the limit threshold of coagulation. As can be seen from the table, the contents of the solid product in the solution is reduced from 35 g/l to 0.9 g/L. The efficiency of extraction of the solid phase from pulpotomies solution is thus 97,4%.

The advantages of the proposed method in comparison with prototype:

1) the Solution is treated at much lower specific energies (8,6 to 11.2 kJ/DM3), which reduces energy costs;

2) Reduction of specific energy processing reduces electrokinetic potential. As a result, the coagulation of the dispersed particles is improved. The solid content in the solution is reduced from 35 g/l to 0.9 g/L. the Efficiency of extraction of the solid phase from pulpotomies solution is 97,4%.

3) the Processing is carried out in a continuous hydrodynamic mode, unlike the prototype, where necessary the use of additional equipment;

4) the optimal ratio of the distance between the electrodes Roand the effective radius of influence of waves R: R/Ro=10,4, in which the use of shock waves in a pulsed electric discharge is most effective.

5) the Ability to determine the optimal diameter of the pipeline.

1. The way of dressing of non-ferrous metals, including flotation, pre-processing pulpotomies solution of pulsed high voltage discharges and further deposition, wherein pre-processing pulpos the holding solution is performed in a pulsed high-voltage discharge with a specific energy of 8.6-11.2 kJ/DM 3served directly in the pipe connecting the flotation machine with a clarifier-thickener.

2. The way of dressing of non-ferrous metals according to claim 1, characterized in that the pulsed high-voltage discharge is executed under the condition
R/Ro=10,4,
where R is the radius of the effective impact of the waves;
Ro- the distance between the electrodes and R.



 

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1 tbl, 7 ex

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2 cl, 22 ex, 1 tbl

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