RU2277974C2 - Method for extracting of fine thin gold in the process of hydromechnized mining of alluvial deposit - Google Patents

Abstract

FIELD: hydromechanized mining of alluvial deposits with increased content of fine thin gold.

SUBSTANCE: method involves providing washing, disintegration, gravitational concentration in deep sluices, screening, gravitational concentration in shallow sluices, washing away concentrate from catching surfaces, and finishing concentrate. For effective extraction of fine thin gold, after gravitational concentration in shallow sluices, screening is performed by means of hydraulic screen for separating 5-mm sized fraction followed by directing said fraction to sluice and screening for separation of 1.5-mm sized fraction to be further directed into heavy mineral concentrator.

EFFECT: increased efficiency in extracting fine thin granules of useful component.

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Description

The invention relates to the hydromechanized development of alluvial deposits with a high content of fine fine gold.

There is a method of extracting fine grains of a useful component in the development of placers, including washing, disintegration, gravity enrichment in deep filling sluices, fine filling, in a fluffy sluice, rinsing the concentrate from the catching surfaces and finishing to the sludge metal (Shokhin V.N., Lopatin A. G. Gravity methods of enrichment, M., Nedra, 1980, pp. 280-308).

However, the known solution does not provide enough extraction of fine fine grains of gold in the development of placer deposits.

The closest set of essential features is the method for extracting fine grains of a useful component in the hydromechanized development of placers, including washing, disintegration, gravity enrichment at deep filling sluices, screening, gravity enrichment in fine filling sluices, rinsing the concentrate from the catching surfaces and finishing the concentrate (RU96 C1, 08/10/2003, B 03 B 5/00, 5/70, 4 pp.).

However, this method does not provide an increase in the efficiency of extraction of fine fine grains of a useful component in the hydromechanized development of placer deposits, since fine fine grains of gold have a relatively low sedimentation in the pulp stream with a class of 6 mm hard.

The main objective of the invention is to increase the extraction of metal during hydromechanical mining of placers by performing fine gravimetric screening after slugging at the sluice to separate the fraction - 5 mm, which is sent to the sluice, after which the fraction - 1.5 mm, which is sent to the concentrator, is isolated by screening heavy minerals.

To solve the problem in a method for extracting fine fine gold during hydromechanical mining of placers, including washing, disintegration, gravity concentration at deep filling locks, screening, gravity concentration in small filling locks, rinsing the concentrate from the catching surfaces and refining the concentrate, while increasing efficiency extraction of fine fine gold after gravitational enrichment at fine filling gateways carry out screening on a hydraulic screen for the separation of the fraction is 5 mm, which is sent to the gateway, after which a fraction of 1.5 mm is allocated by screening, sent to the concentrator of heavy minerals.

In practice, the operation of gravitational installations use the classification of material by equidistant. In the enrichment of a material containing only small grains of heavy minerals, it is useful to reduce their upper limit of nutritional size for effective extraction (Shokhin V.N., Lopatin A.G. Gravity enrichment methods, M., Nedra, 1980, pp. 277-275) .

With a small and small size of the useful component, mineral grains have a low recoverability in the shape of the plate and its connectivity with the host rocks.

For well-washed sand alluvial sands, all the gold lies on the rugs of the first three meters of the floodgate of deep filling, in granular composition from large to small and thin. For these sands, the disintegration of mineral grains is carried out quite successfully when washing with a hydroswash, up to fine and fine gold.

For poorly washy sands of placer gold is located on the rugs as follows. Coarse gold is located on the first three meters of the length of the deep filling sluice, and fine and thin gold lies along the entire length of the deep filling and fine filling sluice with a decrease in the gold composition along the direction of the pulp stream. Poorly washed sands disintegrate during washing on a hydrowashgrad only to the level of fractions of large gold. Fine and thin gold continues to disintegrate along the entire length of the locks of large and small filling with a regular jump in the size of gold grains during the transition to the lock of fine filling, associated with a decrease in the depth of the pulp stream. Small and thin mineral plates become softened and lose contact with plastic or frozen rocks along the entire length of gravity locks.

The presence of cemented grains of mineral with gangue is characterized by losses in the ephels.

A spasmodic increase in the extraction of fine and fine gold, softening and disintegration of minerals occurs more efficiently if the fine-filling gateway is continued with a gateway with a lower flow height. Gravity enrichment characteristics of the subsequent lock, with preliminary screening of the initial material by screening, such as the depth of the stream, the height of the stencils are reduced proportionally between the locks of deep, shallow filling and the subsequent lock.

The phased establishment of the optimal size of the feed material directed to gravity enrichment with more effective indicators of extracting the grains of the useful component creates the conditions for the disintegration and the most complete extraction of fine fine gold at the next stage of enrichment.

After sand enrichment at locks, the flow of pulp with the smallest mineral grains is sent for enrichment to the concentrator of heavy minerals.

The method is as follows.

Example 1. The deposit of alluvial gold with a high content of fine fine gold is mined open-cast using hydromechanical mining. Sands are fed to the perforation table of the hydraulic saber by a bulldozer. The erosion and disintegration of rocks on a horizontal and inclined table of the hydrogauge is carried out by a hydraulic monitor. With the GrAU-400/20 soil pump, the pulp is fed to the PGS-50 deep filling sluice and from there into a slotted hydraulic screen. Fraction - 15 mm is fed to a complex of fine filling gateways, and from it to an arc screen. Sub-product - 6 mm of an arc screen is fed to a Knelson concentrator. Periodically, twice a day, the washing process is stopped and the concentrate is rinsed from the catching surfaces, and then the concentrate is refined. The average gold content in the sand is 1 g / m ³ . The productivity of the mining complex is 50 m ³ / h. The use of operational time for washing sand during the day is 22 hours. The duration of the season 180 working days. Through gold recovery is 82%.

Example 2. The field being developed and the mining technology are similar to those in Example 1.

Additionally, the increase in metal extraction during the hydromechanized mining of placers to increase the efficiency of the extraction of fine fine gold after gravity enrichment at fine filling sluices is performed by screening on a hydraulic screen to separate a fraction of 5 mm, which is sent to the sluice, after which a 1.5 mm fraction is directed by screening to a concentrator of heavy minerals.

A slotted hydraulic screen with a slit width of 1.65 mm emits a fraction of 5 mm from the drain of the fine filling sluice, which is sent to the subsequent sluice.

A slotted hydraulic screen with a slit width of 0.5 mm from the discharge of the subsequent sluice directs a fraction of 1.5 mm to the heavy mineral concentrator.

Through recovery was 91%.

The proposed method for the treatment of fine fine gold in the hydromechanized development of placers in comparison with the prototype allows to increase the amount of recoverable metal for one off-season by 14.21 kg.

Claims (1)

A method for extracting fine fine gold during hydromechanized mining of placers, including washing, disintegration, gravity enrichment at deep filling sluices, screening, gravity enrichment in fine filling sluices, flushing concentrate from trapping surfaces and fine-tuning the concentrate, characterized in that to increase the efficiency of fine fine extraction gold after gravitational enrichment at fine filling sluices carry out screening on a hydraulic screen to isolate the fraction -5 mm , which is sent to the gateway, after which a -1.5 mm fraction is isolated by screening and sent to a concentrator of heavy minerals.