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INVENTION
Patent of the Russian Federation RU2179071
METHOD OF EXTRACTING FINE GOLD
The name of the inventor: Kovlekov II; Dmitriev AA
The name of the patent holder: Yakut State University. M.K. Ammosov
Address for correspondence:
Date of commencement of the patent: 2000.04.28
The invention relates to the mining industry, in particular to the enrichment of sands containing gold and other noble metals, and can be used to increase the efficiency of gold recovery. The method of extracting fine gold includes preparation of sands for enrichment, gravity enrichment of large and medium gold, hydrometallurgical processing of tailings. Tailings of gravitational enrichment are fed to the inclined trough and acted upon by a magnetic field, the extracted magnetic concentrate is subjected to gravitational refinement, the concentrate of which is sent for drying, successively removes strongly magnetic, weakly magnetic fractions and extracts gold from the nonmagnetic fraction by ferrohydrostatic separation, and the tails of gravitational refinement are combined with the tails of a strongly magnetic , Weakly magnetic, ferrohydrostatic separation and directed to hydrometallurgical processing. The invention makes it possible to increase the extraction efficiency of fine and fine gold and to reduce the cost of gold enrichment.
DESCRIPTION OF THE INVENTION
The invention relates to the mining industry, in particular to the enrichment of sands containing gold and other noble metals, and can be used to increase the efficiency of gold recovery by extracting the fine and fine gold lost with the ephel tails.
A method is known for enriching the gold-bearing sand on a hydro-heater rinsing device [1] . The initial sands are fed by the bulldozer into the hopper and the hydroelevator is transported to the head lock. At the end of the head sluice there is a perforated sheet with 30 mm holes. The bottom product of the screen enters the hopper, and then through the pipeline - into three parallelly installed sluices of fine filling. The upper product is fed into the scrubber and further disintegrates. Fraction - 30 mm after dewatering enters the sluices of shallow filling. Galya from the scrubber conveyor is removed into the dump. The main disadvantage of the technological scheme of enrichment on the hydro-heater rinsing device is the large loss of gold in the efel tails due to the low efficiency of extraction of fine gold.
The closest to the technical essence is the method of dressing the sands of alluvial deposits of noble metals [2] , including the fact that the mined rock is disintegrated to release metal particles and screening for the separation of boulders and galleys and sent to enrichment to produce the concentrate. Tailings of enrichment are classified by size into two fractions. A large faction is sent to the dump. Water is used as a reverse in previous operations. Before use, the circulating water is clarified by thickening and separating the fine fraction of the classification from it. From the large fraction of the classification, additional sludge is removed from the sludge and other fine particles, which are then separated from the water by thickening and, together with the fine fraction of the classifier, are sent to the hydrometallurgical treatment, and polyacrylamide is supplied as a flocculant in the thickener.
A disadvantage of this method is the low content of gold in the fine and silt fractions sent to the hydrometallurgical treatment. Large volumes of processing of poor raw materials require complex technology of preparation and enrichment in stationary conditions. Both these factors significantly increase the cost of recoverable small gold.
SUMMARY OF THE INVENTION
The aim of the invention is to reduce the cost of gold enrichment by effectively extracting fine and fine gold.
The goal is achieved by the fact that in the method of extracting fine gold, which includes preparation of sands for enrichment, gravity enrichment of large and medium gold, hydrometallurgical processing of tailings, tails of gravity enrichment are fed to an inclined trough and acted by a magnetic field. The extracted magnetic concentrate is subjected to gravitational refinement, the concentrate of which is directed to drying, successively removes strongly magnetic, weakly magnetic fractions and extracts gold from the non-magnetic fraction by ferrohydrostatic separation. The tail of gravitational development is combined with the tails of strongly magnetic, weakly magnetic, ferrohydrostatic separations and directed to hydrometallurgical processing, which is carried out by cyanidation. Tanning of the tailings is carried out by heap leaching. The proposed method significantly reduces the volumes and improves the quality of the material sent to hydrometallurgical processing. This is done by using a gravitational and magnetic field simultaneously without any energy expenditure. Gravitational debugging before hydrometallurgical processing increases the efficiency of the cyanidation process by removing relatively large gold. The direction of the hydrometallurgical redistribution of the tailings of processing the magnetic concentrate significantly increases the efficiency of the process due to the absence of silt and good permeability of the material.
THE METHOD IS PROVIDED AS FOLLOWS:
Gold-bearing sand with a bulldozer is fed to the hydrostrake for dropping boulders and large ghouls with a jetting jet along the trunk of the hydrostrogs into the tails. The sublattice product in the form of a pulp is lifted by a hydroelevator to the head sluice of deep filling. Then, a large fraction is separated from the pulp in a scrubber barrel. The rock mass is larger than 30 mm directed to the stacker and stored on a pebble dump. A fine fraction of sands less than 30 mm in the form of a pulp is sent by gravity to the sluices of shallow filling. Tailings of gravitational enrichment from sluices of small filling by gravity are fed to an inclined trough and acted by a magnetic field, which makes it possible to create a trapping coating of magnetic particles in the form of a pile. As the capture of gold and other heavy minerals in an artificial bed, the magnetic concentrate is captured. Concentrate is subjected to gravitational development. The resulting concentrate is dried. Strong magnetic and weakly magnetic fractions are successively removed from it, and gold from the nonmagnetic fraction is recovered by ferrohydrostatic separation. Tails of gravitational development are stored in a special area for heap leaching. The extraction of gold is carried out by cyanidation.
EXAMPLE OF CONCRETE EXECUTION OF THE METHOD
As an example of the implementation of the method of enrichment technology, consider a placer gold deposit, characterized by a large proportion of fine, fine and bound gold. Gold-bearing sand is supplied by digging and transporting equipment to the hydrostrake. On the hydrostrog, wash and remove the ghal. The negative class in the form of pulp by a hydroelevator rises to the head sluice of deep filling. Large gold mines settle on the head sluice. Then the pulp is screened. The bottom product of the screen is directed through the hopper to the sluices of shallow filling. The upper product of the screen is sent to a scrubber barrel for additional disintegration. Galya +30 mm conveyor belt is fed and stored on a pebble dump. The fraction of sand - 30 mm in the form of pulp is gravity fed to the sluices of shallow filling.
Efel tails from sluices of shallow filling gravity are sent and are enriched on an inclined trench. An inclined gutter is a gateway reinforced with permanent magnets. The slope angle of the lock is 6 o , the length is 6 m . Magnetic particles create a catching surface at the bottom of the sluice. Particles of non-magnetic heavy minerals, including gold, moving along the lower part, are retained and get stuck on a rough catching surface. Magnetic concentrate in a daily survey contains fine and fine gold from 10 to 100 g / t . In the presence of a significant amount of gold larger than 0.1 mm, the magnetic concentrate is subjected to gravitational refinement at the lag gate at low water. The obtained gravure concentrate is dried, then strongly magnetic and weakly magnetic fractions are removed successively, and gold from the non-magnetic fraction is recovered by ferrohydro-hydrostatic separation. Tailings of gravitational refinement, strongly magnetic, weakly magnetic and ferrohydrostatic separations are combined and directed to cyanidation. With a small volume and high gold content, cyanidation is carried out on a cone or on a cuvette. With large volumes of cyanidized material, more than 10,000 Tons of it is poured into a specially equipped site for heap leaching.
Thus, the proposed technical solution will significantly increase the efficiency of extracting fine and fine gold by reducing the cost of extraction by reducing the volume and improving the quality of the material being sent to hydrometallurgical processing.
INFORMATION SOURCES
The method of claim 2, wherein the cyanidation of the magnetic concentrate is carried out by heap leaching.
Zamyatin OV, etc. Enrichment of gold-bearing sands and conglomerates. - M.: Nedra, 1975, p. 190-192.
The patent of the Russian Federation N 2095149 C1, B 03 B 7/00, 10.11.1997.
CLAIM
A method for extracting fine gold, including preparation of sands for enrichment, gravity enrichment of large and medium gold, hydrometallurgical processing of tailings, characterized in that the tails of gravity enrichment are fed to an inclined trough and acted upon by a magnetic field, the extracted magnetic concentrate is subjected to gravitational refinement, the concentrate of which is sent for drying Strongly magnetic, weakly magnetic fractions are removed from it successively and gold is extracted from the non-magnetic fraction by ferrohydro-static separation, and the tails of gravitational refinement are combined with the tails of strongly magnetic, weakly magnetic, ferrohydrostatic separation and directed to hydrometallurgical processing.
The method of claim 1, wherein the hydrometallurgical processing is carried out by cyanidation.
The method of claim 2, wherein the cyanidation of the magnetic concentrate is carried out by heap leaching.
print version
Date of publication 05.12.2006гг
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