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, 4 ex

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9 tbl, 7 ex

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10 cl, 4 ex

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6 tbl, 2 ex

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1 tbl, 2 ex

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2 cl, 2 tbl, 1 ex

FIELD: metallurgy, mining.

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1 ex

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1 tbl, 1 ex

FIELD: processes for extracting gold from ores.

SUBSTANCE: method comprises steps of breaking ore, double-stage disintegration of it, sorting, gravitation and flotation con centration, sorption leaching, electrolytic extraction of gold and melting it. At cycles of primary and secondary disintegration of initial ore hydraulic sorting is performed for producing sand fraction of ore and drain. Then sand fraction is divided by flow for gravitation concentration and flow for secondary disintegration. Divided flow of sand fraction is fed for gravitation concentration in quantity determined according to given formula: γ gr.f. = (0.3 - 0.4)γ in.ore + (0.2 - 0.6)γ circ.load where γ gr.f - mass of sand fraction of disintegrated ore fed for gravitational concentration; γin.ore - mass of initial ore fed for primary disintegration; γ circ.load - mass of circulation load for secondary disintegration. Gravitational concentration of drain and divided flow of sand fraction are realized for producing separate gravitation concentrates and separate tails. Then gravitation concentrates of drain and divided flow of sand fraction are combined and after their combination they are divided by "gold head" concentrate and depleted gravitation concentrate. The last is subjected to intensified cyaniding for producing solid phase and gold- containing solution. Tails of gravitation concentration of drain of sorting are subjected to flotation and prepared flotation concentrate is combined with solid phase of intensified cyaniding to be subjected to sorption leaching and desorption for producing gold-containing solution. Then separate electrolytic deposition of gold from gold-containing solutions of intensified cyaniding and sorption leaching is performed for producing separate cathode deposits of gold. Produced " gold head" and cathode deposits of gold are subjected to calcining and melting for producing gold in ingots.

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1 dwg

FIELD: leaching extraction of non-ferrous and precious metals from refractory ores by cyaniding process.

SUBSTANCE: method involves cyclical or continuous leaching of metal from ore-containing pulp; supersonic processing; collecting and processing pregnant solution; providing supersonic processing at cyclical leaching after first leaching process and at continuous leaching - before first leaching process by exposing to supersonic field having intensity of 1-70x104 W/m2 in hydrodynamic generator and simultaneously feeding air. Method allows efficiency of metal extraction process to be increased due to fundamental changing of supersonic process parameters, in particular, supersonic field intensity, increased concentration of solved and dispersed gaseous oxygen and products of acoustic-chemical reactions in pulp, and additional grinding of ore grain.

EFFECT: increased efficiency of process and reduced labor intensity due to the fact that generator functions in self-oscillating operational mode and does not need additional works, and simplified process.

2 dwg

FIELD: hydrometallurgy, in particular, extraction of gold from rebellious sulfide auriferous-arsenical ores.

SUBSTANCE: method involves providing crushing, grinding, flotation concentration of basic raw material; performing biological oxidation of concentrate; neutralizing products of biological oxidation; providing sorption cyaniding of neutralized products of biological oxidation and flotation tailings; regenerating sorbent; electrolyzing solutions of eluted gold from sorbent; providing calcination and melting of cathode sediments for producing of alloy gold ingots; providing flotation of ore, which is ground to 85-90% size of 0.074 mm size class, using discharge of thickeners and recycled water from tailings dump, which water being conditioned to residual concentration of cyanide of 0.1-0.2 mg/l. Concentrate is subjected to biological oxidation at temperature of 37-42 C in two stages at concentration of oxygen in pulp of at least 1-2 mg/l. Biological oxidation products are neutralized to pH value of 4-6 without separation of solid from liquid in pulp using flotation tailings at first stage and milk of lime is neutralized at second stage with increase of pH value of pulp to 10.5-11. Neutralized biological oxidation products are subjected to sorption leveling at first stage with NaCN concentration of 400-500 mg/l, and at second stage sorption cyaniding of first stage tailings and all of flotation tailings at NaCN concentration of 200-300 mg/l is performed.

EFFECT: increased extent of extracting gold from rebellious sulfide auriferous-arsenical ores.

5 cl, 1 dwg, 1 tbl

FIELD: regeneration of free cyanide in waste technological solutions containing cyanides and heavy metals; non-ferrous metallurgical plants; gold mining and galvanic processes.

SUBSTANCE: proposed method consists in treatment of waste technological solutions by mineral acid under conditions excluding formation of gaseous hydrocyanic acid followed by separation of phases: solution of hydrocyanic acid and difficultly soluble compounds of elementary cyanides of metals by settling and/or filtration, leaching of clarified solution and re-use of solution of free cyanide thus obtained. Regeneration of free cyanide is carried out directly in solution being treated without conversion of hydrocyanic acid into gaseous phase.

EFFECT: repeated use of cyanide; reduced consumption of cyanide and fresh water; facilitated procedure; extraction of non-ferrous metals from solution in form of compact concentrate.

1 dwg, 2 ex

FIELD: hydrometallurgy of noble metals; stage of preparation of ores of tailings of gold extraction mill and beyond-balance ore of underground mining before heap leaching of gold.

SUBSTANCE: proposed method includes preparation of ore consisting in joint nudilizing of beyond-balance ore at content of gold no less than 0.5 g/t (50%) and old tailings (50%) at addition of cement in the amount of 2-2.4 kg/t.

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

1 tbl, 6 ex

FIELD: hydrometallurgy of noble metals; leaching of gold from stacks.

SUBSTANCE: sodium cyanide solution is introduced at the moment when size of ore is lesser than 20 mm by sprinkling the ore escaping from hole of last crusher and sprinkling the minus material of screening of previous stages of crushing which is conditioned in size. Degree of extraction of gold from freshly crushed quartz-feldspar ore making use of ore "ripening" effect crushed to class of 10 mm and nodulized with sodium cyanide of piston-type sprinkling and oxygenation of circulating solutions is equal to 74% during 25 days.

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