Method of ore heap leaching

FIELD: metallurgy.

SUBSTANCE: invention relates to method of metals heap leaching, notably, gold from ore. Method includes ore reduction, ore division into fractions, ore dump by uniform in fractions inclined layers with reduction of ore fineness from the low layer to top with separation of layers by perforated polymer film. Then it is implemented stack irrigation by leaching cyanide solution with concentration 0.2-0.8 g/l. Additionally after dump of each ore leaching it is implemented treatment of layer by cyanide solution with strengthen concentration and its standing. Concentration of cyanide solution and standing duration are reduced from low later to top from 2.0-4.0 g/l till 1.0-1.5 g/t and from 5-6 days till 2-3 days correspondingly.

EFFECT: leaching effectiveness increase.

1 dwg

 

The invention relates to the field of leaching of ores of nonferrous, rare and radioactive metals and can be used in the mining industry, mainly in the extraction of gold.

Known methods of heap leaching of ores, including todopoderoso, the formation of stacks of ore, irrigation stacks of ore leaching solution, the infiltration of the solution into an array of stacks, the dissolution of metal and drainage enriched solvent. As leaching solutions used water (for uranium ores containing pyrite), weak solutions of sulphuric acid, a solution of iron sulfate and sulfuric acid, soda solution, sodium cyanide and other (see Kalabin A.I. Mining underground leaching): Atomizdat, 1969, P.95-319; Rysev VP, Sadykov, BC, Fazlullah M.I. Experience in heap leaching of gold Gorn. - 1994. No. 12 - p.8-10).

The disadvantage of this method is to reduce the rate of leaching and the completeness of extraction of metal due to clogging of the pore space at the bottom of the pile due to segregation pieces of ore and sufoziya (transfer) of fine particles (clay, silt) from the top of the pile at the bottom. At low outside temperatures the rate of leaching is also sharply decreases due to the increase in the viscosity of the leach solutions.

The closest to perfect UEMOA is a method of heap leaching of gold, include ore crushing, ore pelletizing, dumping stacks, application of stacks of ore leaching solution. After crushing the ore into fractions, and the dumping of ore carry out homogeneous fractions layers, reducing the particle size of the ore from the lower layer to the upper layer. In addition, the dumping of ore implement inclined layers with separation of perforated layers of geotextile material, in dumping the pile guide the wider side to the South (see U.S. Pat. Of the Russian Federation No. 2283879, IPC SW 3/04, SW 11/00).

However, this method of heap leaching clay slime ores in General improve the filtration properties of the pile can be characterized by a lack of extraction of metal from the lower layers of coarse fraction (+15)...(-20) mm, (+10)...(-15) mm, (+5)...(-10) mm due to the relatively short time of contact with the surface of the lumps of ore leach solutions because of the high speed filtration in these layers.

The technical result of the invention is to improve the efficiency of leaching.

The result is achieved that the method of heap leaching of gold from ores, which includes ore crushing, ore separation into fractions, dumping ore homogeneous fractions of the inclined layers with decreasing particle size of the ore from the lower layer to the upper layer division of a perforated polymer film and the irrigation of the pile is selecively solution after filling each layer produce ore processing layer cyanide solution of high concentration and maturation within 2-6 days, and the concentration of the cyanide solution and the duration of maturation decrease from the bottom layer to the top.

Pre-treatment osypaemy layers cyanide solutions of high concentration and subsequent exposure can increase the completeness of extraction of metal, in particular of large fractions of classes (+15)...(-20) mm, (+10)...(-15) mm in the lower layers due to the deep diffusion of the concentrated leach solution and the entry into the reaction of cyanide complexes of gold. Further leaching of the pile is actually reduced to the washout of previously prepared reacted ore leach solutions.

The drawing shows a stack, where 1 is the bottom layer of the stack (fraction (+15)...(-20) mm; 2 - layer stacks of fraction (+10)...(-15) mm; 3 - layer stacks of fraction (+5)...(-10) mm; 4 - layer stacks fraction (-5) mm; 5 - irrigation and power stacks; 6 - lateral surface of the pile of ore; 7 - collectors collection process solutions; 8 - base of the pile; 9 - perforated polymer film.

The method is as follows.

When radiopathology on the crushing and sorting plant (DSU) of the extracted ore is crushed and separated into fractions, typically the class is am (-5,0) mm, (+5)...(-10) mm, (+10)...(-15) mm and (+15)...(-20) mm Dumping stacks start with a layer of ore fractions (+15)...(-20) mm 1, produce its irrigation leaching solution with a high concentration of cyanide...4,0 2,0 g/l to complete vlagonasyschennyh produce aged for 5...6 days. Then stack a perforated polymer film 9 and occiput layer of ore fractions (+10)...(-15) mm 2 and irrigate his leach solution with a concentration of cyanide 1.5 to 2.5 g/l to complete vlagonasyschennyh and stand for 4 to 5 days. After that stack perforated film 9 and occiput the next layer of ore fractions (+5)...(-10) mm 3, irrigate its leaching solution high concentration of cyanide 1...2 g/l to complete vlagonasyschennyh and stand for 3 to 4 days. Then stack perforated film 9 and occiput the top layer of ore 4 small fraction class (-5,0) mm and irrigate his leach solution concentration of cyanide 1...1.5 g/l to complete vlagonasyschennyh and stand within 2 to 3 days. After that, on the surface of the top layer 4 is placed stationary irrigation system and power supply 5 and proceed to continuous irrigation stacks of ore leach solution concentration of cyanide according to the technological regulations - usually 0,2...0,8 g/l

Under irrigation, the leaching solution of clay and slurry particles are leached from the upper layers in h is life and under the action of dynamic pressure taken out through the perforated film 9 and the side surface 6 stacks of ore, as a result of this prevents clogging of the ore in the array of stacks and increases the rate of filtration of leach solution. When passing a leaching solution through the lower layers are actually leaching the reacted during the settling of ore cyanide complexes, resulting in increased metal recovery. The pregnant solution is collected 7 and after cleaning it from the clay particles being filtered is directed into the sorption apparatus for metal recovery.

The proposed method can improve the efficiency by increasing the rate of filtration of the leach solution in the sample and more complete extraction of the metal from krupnomasshtabnykh layers of ore due to their preliminary cyanide training.

Method of heap leaching of gold from ores, which includes ore crushing, ore separation into fractions, dumping ore homogeneous fractions of the inclined layers with decreasing particle size of the ore from the lower layer to the upper layer division of a perforated polymer film, irrigation pile of barren cyanide solution with a concentration of 0.2-0.8 g/l, characterized in that after filling each layer of ore are processed layer cyanide solution of high concentration and maturation of it, with the concentration of the cyanide solution and continue inost maturation decrease from the bottom layer to the top from 2.0-4.0 g/l to 1.0-1.5 g/t and from 5-6 days to 2-3 days respectively.



 

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5 cl, 1 dwg, 1 tbl

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EFFECT: enhanced efficiency of extraction of gold from technogenious wastes at low content of gold.

1 tbl, 6 ex

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EFFECT: enhanced efficiency of extraction of gold due to increased rate of dissolving.

6 tbl, 6 ex

FIELD: hydrometallurgy of precious metals; extraction of gold at heat leaching-out of gold-containing ores by cyanide solutions.

SUBSTANCE: proposed method includes additional dissolving of oxygen in cyanide solution in the amount of 33-38 mg/l for obtaining required degree of extraction of gold in product solutions equal to 80% during 10-15 days of leaching-out of crushed ore. Expenses for oxygen do not exceed 1.1.5 rubles/t of ore.

EFFECT: increased productivity; increased extraction of gold into product solutions.

1 tbl, 1 ex

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