Method of acoustic and hydraulic pulse softening and disintegration of highly plastic clay sands of gold-bearing placers

FIELD: technological processes.

SUBSTANCE: invention relates to mining industry and may be used to develop natural and anthropogenic high-clayey gravel deposits of minerals with high content of fine and thin gold. The method of acoustic and hydraulic pulse softening and disintegration of high-plastic clay sands of gold-bearing placers includes placer opening, formation of an accumulator, softening of clay sands with the help of water supply and subsequent filtration process, assembly of a plant of discharge hydraulic transportation of the hydraulic mixture. Hydraulic washing of sands is carried out with subsequent free-flow supply of a hydraulic mixture into the accumulator and subsequent pressure hydraulic transportation of the hydraulic mixture to the system of washing and sizing, which is coupled with an additional accumulator by means of a mechanism that supplies the sized hydraulic mixture. Periodic acoustic exposure is carried out with directed radiation of 20 kHz frequency and intensity from 5 to 10 W/cm2 to a large-sized solid component of the hydraulic mixture in the additional accumulator before and after periodical hydrodynamic exposure of pulse loads generated in case of high-voltage electric breakthrough and producing voltage with exceeding the limit strength of the solid component of the hydraulic mixture depending on its water saturation. Number of charges is determined on the basis of the specific size of the largest piece.

EFFECT: increased efficiency of damage and disintegration of clay sands of placers.

1 dwg, 1 tbl

 

The invention relates to the mining industry and can be used in the development of natural and man-made high-clayey alluvial deposits of minerals with a high content of fine gold.

There is a method of destruction of a rock, according to which the array of exposed rock cutting tool, and ultrasonic vibrations at the site of contact of the latter with an array, you determine the direction of maximum compressive stress in the array, and the direction of ultrasonic vibrations are oriented perpendicular to the direction of maximum compressive stresses ahead about the impact of rock cutting tools /1/.

The principle underlying the complete method, designed for the destruction of rocks ore type in underground development and may not be used for crushing of medium to high plasticity clayey sand placers in an open way.

Known way to control the transformation process gold-bearing rocks, including the loss of strength of the rock mechanical impact with subsequent periodic initiation of elastic waves in the ultrasonic range with a constant frequency in the sand and clay rock - water, the initiation of elastic waves are prepostional external pressure, different time intervals and capacities, and in the preliminary selection of the controlled range of particle sizes, determine the optimal exposure time at which ensured the stability of the sediment clay particles in the system with constant volume, then calculate the conditional coefficients of transformation, build schedule changes in these coefficients of transformation from the time from which define the controlled increase of the initial value of the specific surface razuprochneniya particles on the order in which lower power ultrasonic radiation twice /2/.

This method does not include the intensification bulk stations sealed and water-saturated Sands and can be used for activation of the slurry and its control.

The closest in technical essence is a way of softening and disintegration of clay sand gravel deposits, including the opening of deposits, sinking vodozabornoy trench with a slope in the direction of drop formation deposits and drainage trench depth with the height difference of the bottom of the trench from 1.5 to 3 m, water filling vodozabornoy trench with simultaneous filling of the developed area placers water to a depth that provides the mounting and installation of equipment in a floating state, and maintain this level in future the m for the primary softening clay Sands with water supply through an adjustable shutter the natural process of water filtration in the array, the installation of pressure hydrotestosterone. At the end of the discharge slurry line set videobrothel and hydrodynamic cavitator /3/.

The disadvantage of this method is that the process of disintegration is carried out by exposing the cavitating mechanism in the slurry. However, in the first stage, natural water filtration in the array process is not initiated and therefore develops rather slowly, as the permeability of clay is the value from the fourth to the sixth order of smallness - 0,0005-0,000005 cm/S.

The technical result of the proposed method is to increase the efficiency of destruction and disintegration clayey sand placers by a combination of ultrasonic and pulse hydrodynamic effects.

The technical result is achieved due to the fact that the way akustikgitarre softening and disintegration of highly plastic clayey Sands of gold placers, including the opening of mines, the formation of memory, the loss of strength of the clayey Sands with water and subsequent filtration process, the installation of pressure hydrotestosterone slurry, producing a jet of sand, with subsequent gravity feed slurry into the drive and the second pressure hydrotestosterone slurry to a system for washing and classification which is mated by submitting classified slurry mechanism with an additional drive, carry out periodic acoustic impact of directional radiation frequency of 20 kHz and an intensity of from 5 to 10 W/cm2on lumpy solid component of the slurry in the secondary storage before and after periodic hydrodynamic effects of pulsed loads generated by high-voltage electrical breakdown and creating a voltage exceeding the ultimate strength of the solid component of the slurry, depending on its water saturation, the number of digits is determined by calculating the characteristic size of the largest piece.

The combination of significant new features allows you to solve a new technical problem is to intensify the process of disintegration clayey Sands of gold placers through a combination of ultrasonic and pulse hydrodynamic effects.

In the drawing - General view of the development system placers implementing method.

The method is performed using mining dredging complex, which includes the giant 1, drive 2, install pressure hydrotestosterone slurry 3, 4, 5, system washing and classification 6, which is mated through the supply classific is stimulated slurry mechanism 7 with the additional drive 8, processing complex 9, the water supply system 10 and Italobrothers complex 11, the installation of ultrasonic influence 12 and the installation of electrohydrodynamic effects 13 on the solid component of the slurry. Install pressure hydrotestosterone slurry 5 contains the drive 14 with the regulation of the feed slurry for processing complex 9.

The way akustikgitarre softening and disintegration of highly plastic clayey Sands gold placer is as follows.

By opening placers, the formation of the drive 2 and the secondary storage device 8, the installation pressure hydrotestosterone slurry 3, 4, 5, system washing and classification 6 submitting classified slurry mechanism 7, Italobrothers complex 11. Using giant 1 produce a jet of sand, with subsequent gravity feed slurry into the drive 2. In the drive 2 is the loss of strength of the clayey Sands through the filtration process. From memory 2 by setting the pressure hydrotestosterone slurry 3 slurry is fed to the system erosion and classification 6, which is connected with the water supply system 10. After classification through submitting classified slurry mechanism 7, the slurry is sent in the drive 8. With the installation of ultrasonic impact 12 perform acoustic impact of directional radiation frequency of 20 kHz and an intensity of from 5 to 10 W/cm2on lumpy solid component of the slurry in the secondary storage, 8 (table).

The porosity of 26%, the average water content of 1.5%
Table
Estimates of the normal stress components of the compression-tension by ultrasound exposure on high-plastic Sands of gold-bearing placers in the saturated state
Equivalent to the calculated density of highly water-saturated Sands ρe·103kg/m3Constants LamaThe estimated magnitude of the normal component of stress (compression-tension) σ (kgf/cm2
µ·109kg/m·s2λ·109kg/m·s2when deformation |S|=10-4m
The porosity of 26%, the average water content of 15%
2,198-2,2323,176-3,2033,176-3,20412,7-12,81
2,389-2,4286,4-6,5346,427-6,5425,65-26,15
The porosity of 33%, the average water content of 25%
2,057-2,0872,38-2,3792,378-2,3849,52-at 9.53
The porosity of 33%, the average water content of 3%
2,368-2,4065,745-5,8465,747-UAH 5,84822.98mm-23,39
Porosity of 40%, the average water content of 30%
1,987-2,0152,034-2,0452,03-2,0468,13-8,12
Porosity of 40%, the average water content of 4%
2,354 had 2,3925,379-5,4665,376-5,46321,51-21,86

The time interval of exposure can range from 5 to 15 minutes. Through the installation of electrohydrodynamic effects 13 produce periodic hydrodynamic impact pulses, obrazuyuscikhsya high voltage electrical breakdown and creating a voltage exceeding the ultimate strength of the solid component of the slurry, depending on its water saturation. The number of digits n is determined by calculating the characteristic dimension h the greatest piece [4]

,

where E and ρ is the young's modulus and density of the destructible rocks; τ is the duration of the discharge; σkr- voltage, providing a critical condition destructible piece in water-saturated condition; σm- the maximum voltage generated in the piece pressure pulsed discharge.

After that make the acoustic impact of directional radiation frequency of 20 kHz and an intensity of 5 W/cm2. Dispergirovannoyj slurry is served by installing pressure hydrotestosterone slurry 5 in the memory 14 from which by adjusting the slurry is fed to processing complex 9.

The active process of disintegration clayey Sands with ultrasound and pulsed hydrodynamic effects can be carried out during the development of the deep placers in an open way. The method provides effective environmental security and enables effective directional transform as flexible, and subplotting clayey Sands with open alluvial mining.

Sources of information

1. A.S. 1666707, RUSSIA. The method of destruction of a rock / Lmiter etc. - 30.07.1991. - Bull. No. 28.

. Pat. 2276727, Russia. The method of controlling the transformation process gold-bearing rock / Nephronia, Whammies. - 20.05.2006. - Bull. No. 14.

3. Pat. 2288361, Russia. Method of softening and disintegration of clay sand gravel deposits / Ammolite etc. - 27.11.2006. - [Electronic resource]. - Mode of access: www.fips.ru.

4. Gamanovich VI, Raizman, VA, Streltsov VA rock Destruction pulsed loads // electrical discharges in liquids and its application: collected scientific articles. Tr. - Kiev: "Naukova Dumka", 1977. - S-165.

The way akustikgitarre softening and disintegration of highly plastic clayey Sands of gold placers, including the opening of mines, the formation of memory, the loss of strength of the clayey Sands with water and subsequent filtration process, the installation of pressure hydrotestosterone slurry, characterized in that produce a jet of sand followed for gravity flow of the slurry in the storage and subsequent discharge hydrotestosterone slurry to a system for washing and classification, which are conjugated by submitting classified slurry mechanism with an additional drive, carry out periodic acoustic impact of directional radiation frequency of 20 kHz and an intensity of from 5 to 10 W/cm2on lumpy TV is rdwy component of the slurry in the secondary storage before and after periodic hydrodynamic effects of pulsed loads, formed by high-voltage electrical breakdown and creating a voltage exceeding the ultimate strength of the solid component of the slurry, depending on its water saturation, the number of digits is determined by calculating the characteristic size of the largest piece.



 

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