Method of cavitation-acoustic weakening and disintegration of placers' clay sands

FIELD: process engineering.

SUBSTANCE: invention relates to mining and may be used in developing natural and technogenic placer deposits of natural resources with increased content of fine and thin gold. Proposed method comprises deposit opening, producing sump, weakening rocks by feeding water and filtration, and mounting pipeline transport of hydraulic mix with pumps with hydrodynamic cavitation agitator. Pre-loosened mined rock arranged in sump first section by bulldozer agitator is subjected to ultrasound at frequency of 20 Hz and intensity of 10 to 20 W/cm2. Water is forced into sump first section in amount making 0.15 to 0.3 of volume content of rocks lumps at porosity of 26 to 40% to act by ultrasound with 20 Hz-frequency and 10 to 20 W/cm2-intensity onto hydraulic mix and feeding said mix to system of jetting and grading with pre-disintegration by hydrodynamic cavitation agitator. Simultaneously with loosening mined rock in first section, second sump section is filled with loosened mined rock. Jetting and grading with barren rock and feeding hydraulic mix in additional sump are performed for additional saturation with water. Water is additionally fed into additional sump with the solid-to-liquid ratio of 3:7 to act by ultrasound with 20 Hz frequency and 10 to 20 W/cm2 intensity onto hydraulic mix solid component in additional sump.

EFFECT: higher efficiency and environmental safety.

2 dwg

 

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 the 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 method is intended for destruction of rocks ore type and cannot be used for crushing of medium to high plasticity clayey sand placers.

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 is carried out at a constant external pressure, different time intervals and capacities and pedwar the positive selection of the controlled range of particle sizes determine the optimal exposure time, that provides the stability of 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 subsequent to initial softening clay Sands with water supply through an adjustable shutter, the natural process of water filtration in the array, the installation setting the pressure of 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 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 ultrasonic exposure to radiation in accordance with the properties and condition of the pieces of the rock mass and the solid component of the slurry.

The technical result is achieved due to the fact that in the method of cavitation acoustic softening and disintegration of clayey Sands of gold placers, including the opening of mines, forming sump, the loss of strength of the rock mass with water and subsequent filtration process, the installation of pressure hydrotestosterone slurry with hydrodynamic cavitator, produce periodic ultrasonic impact frequency of the radiation 20 kHz and an intensity of from 10 to 20 W/cm2on pre-Electromechanical is loosened and placed in the first compartment of the sump with the bulldozer-loosening of the rock mass unit, carried out in the first compartment of the sump water supply hydrotransport system, volumetric content of which pieces of rock with porosity from 26 to 40% of the value of from 0.15 to 0.3, followed by ultrasonic impact frequency of 20 kHz and an intensity of from 6 to 10 watts/cm2to the slurry and applying the slurry to a system for washing and classification with the preliminary disintegration by hydrodynamic cavitator, at the same time with the process of weakening of the rock mass in the first compartment of the sump is filled mechanically loosened mountain mass of the second compartment of the sump, produce washing and classification with the Department of waste rock and the flow of slurry in the secondary sump for water saturation, thus providing additional water supply in the secondary sump with a ratio of t:W 3:7 and subsequent ultrasonic treatment the radiation frequency of 20 kHz and an intensity of from 2 to 5 W/cm2on the solid component of the slurry in the secondary sump.

The combination of significant new features allows you to solve a new technical problem is to intensify the process of extraction by ultrasonic impact powerful radiation on mechanically loosened rock mass, the intensification of natural water filtration process in the lumpy mountain is Assos by ultrasonic radiation average power, subsequent cavitation and sound effects on the slurry in the low intensity range before enrichment.

Figure 1 - General view of the system development placers, ensure the implementation of the method; figure 2 - mining dredging complex using cavitator ultrasonic installation.

The method is performed using mining dredging complex, which includes bulldozers unit 1, two ultrasonic installation 2, the sump 3. The sump 3 has a first compartment 4 and a second compartment 5. Install pressure hydrotestosterone slurry 6 connects the first compartment 4 and a second compartment 5 sump 3 system erosion and classification 7 and provided with a hydrodynamic cavitator 8. In addition to the sump 3 is added to the sump 9, which receives the classified slurry after separation of the waste material in the system of washing and classification 7. The complex is equipped hydrotransport system 10 of the water in the first compartment 4, the second compartment 5 sump 3 to erosion and classification 7 and additional sump 9. Additional sump 9 is associated with processing complex 11 through the installation of pressure hydrotestosterone slurry 12.

Method cavitation acoustic softening and disintegration of clayey Sands gold placer is following the way.

By opening deposits and the formation of the sump 3 with the first compartment 4 and a second compartment 5 and an additional sump 9. Produce installation pressure hydrotestosterone slurry 6 with hydrodynamic cavitator 8, install pressure hydrotestosterone slurry 12 and erosion and classification 7. Using bulldozer-loosening unit 1 rock mass mechanically loosen and placed in the first compartment 4 of the sump 3. Using ultrasonic installation 2 produce periodic ultrasonic influence the emission frequency of 20 kHz and an intensity of from 10 to 20 W/cm2on mechanically loosened and placed in the first compartment 4 of the sump 3 mountain mass. Then is the loss of strength of the rock mass and the subsequent filtration process in the first compartment 4 of the sump 3 through the water supply hydrotransport system 10. When reaching the volumetric water content in the piece of rock with porosity from 26 to 40% of the value of from 0.15 to 0.3 produce subsequent ultrasonic impact frequency of 20 kHz and an intensity of from 6 to 10 watts/cm2to the slurry in the first compartment 4 of the sump 3 and the flow of slurry to the system erosion and classification 7 preliminary disintegration by hydrodynamic cavitator 8. Simultaneously with the process of softening mountain m the chick in the first compartment 4 of the sump 3 is mechanically loosened rocks second compartment 5 of the sump 3. The process of rock mass in the second compartment 5 of the sump 3 is repeated as the process that produced in the first compartment 4. Install pressure hydrotestosterone slurry 6 transports the slurry to the system erosion and classification 7. With the help of washing system and classification 7 is a washout and classification slurry with the Department of waste rock. Delivery of the slurry in the secondary sump 9 for additional water saturation. Using hydrotransport system 10 provide additional water supply in the secondary sump 9 with a ratio of t:W 3:7 and subsequent ultrasonic treatment the radiation frequency of 20 kHz and an intensity of from 2 to 5 W/cm2on the solid component of the slurry in the secondary sump 9. Additional sump 9 the dispersed slurry by setting the pressure hydrotestosterone slurry 12 enters the processing complex 11, which may consist of classifying units.

The method provides effective environmental security and enables effective directional transform as flexible, and subplotting clayey Sands with open alluvial mining. The active process of disintegration clayey Sands with ultrasound at an open bit the design can be PA depths up to 30 meters.

Sources of information

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

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

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

Method cavitation acoustic softening and disintegration of clayey Sands of gold placers, including the opening of mines, forming sump, the loss of strength of the rock mass with water and subsequent filtration process, the installation of pressure hydrotestosterone slurry with hydrodynamic cavitator, characterized in that produce periodic ultrasonic influence the emission frequency of 20 kHz and an intensity of from 10 to 20 W/cm2on mechanically loosened and placed in the first compartment of the sump with the bulldozer-loosening of the rock mass unit, is carried out in the first compartment of the sump water supply hydrotransport system, volumetric content of which pieces of rock with porosity from 26 to 40% of the value of from 0.15 to 0.3, followed by ultrasonic impact frequency of 20 kHz and an intensity of 6 is about 10 W/cm 2to the slurry and applying the slurry to a system for washing and classification with the preliminary disintegration by hydrodynamic cavitator, at the same time with the process of weakening of the rock mass in the first compartment of the sump is filled mechanically loosened mountain mass of the second compartment of the sump, produce washing and classification with the Department of waste rock and the flow of slurry in the secondary sump for water saturation, thus providing additional water supply in the secondary sump with a ratio of t:W 3:7 and subsequent ultrasonic treatment the radiation frequency of 20 kHz and an intensity of from 2 to 5 W/cm2on the solid component of the slurry in the secondary sump.



 

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