Method of bath-well leaching of metals

FIELD: mining.

SUBSTANCE: method of bath-well leaching of metals from ores includes treatment of mineral mass by solution of leaching in baths and metal winning from product solution. Baths are formed along leached mass, in the baths bottom a system of injection and extraction wells is built located above the level of bath with depth not less than the lower point of leached layer of mineral mass, and baths are filled with agglomerated mineral mass or pulp prepared in advance from extracted material, mineral mass in baths is treated by solution of leaching, and metal is extracted from product solution. Reusable solution obtained after metal extraction is strengthened or replaced with solution of another composition and is supplied to the system of injection wells for leaching of lower layers of material, then working solution is pumped off with leached metal through the system of extraction wells and metal is extracted from it; for leaching of lower layers of material solutions of environmentally safe chemicals, such as chlorides or thiosulfates, are used.

EFFECT: invention allows improving metal extraction efficiency.

 

The technical solution relates to the mining industry, namely the concentration of minerals by physical and chemical methods, and can be used in the processing of hard ore mineral raw materials and industrial waste.

There is a method of in-situ leaching of metals from oxidized ores, comprising the sequential injection of reagent solutions into the reservoir through a system of injection wells and pumping productive solutions through the system odajnyk wells and subsequent processing of the productive solution and decontamination of the polygon by injection of sodium thiosulfate solution to obtain udachnogo solution having a pH of brine ore-bearing horizon (see RF patent №2074958, IPC E21B 43/28, published. 10.03.1997).

The disadvantages of this method include low intensity and degree of leaching, due to poor preparation solutions upper part of the ore Deposit or a mound of mineral raw materials.

The known method of the ditch and heap leaching of metals from refractory ores (see RF patent №2350665, IPC C22B 3/18, published. 27.03.2009), including the processing of mineral mass solution leaching reagent into cuvettes, the ward after leaching the main part of the metal sand fraction, the formation of her bulk or alluvial formations, heap leaching and metal evolution inproductive solution.

The disadvantages of this method include the relatively high operating costs caused by moving all amounts leached mineral mass from the place of occurrence or storage.

The technical result of the proposed method is to increase the efficiency of extraction of metals through the cuvette method of leaching from the upper layers of mineral mass and in-situ leaching from the main part of the object.

This object is achieved in that the method of the ditch and in-situ leaching of metals from ores, special dumps and stockpiled tailings, including the processing of mineral mass solution leaching reagent into cuvettes and the selection of metal from the pregnant solution, characterized in that the cuvette is formed on the leached mass in the bottom of the ditch construct a system of injection and odajnyk wells located above the level of the bottom of the cuvette and a depth of not less than lower grades leached layer mineral mass produce filling ditch agglomerated mineral mass or pulp made from previously learned material, process mineral mass in cuvettes solution leaching reagent and selection metal from the pregnant solution is then obtained after separation of the metal working solution is ukreplyayut or replace with a solution of a different composition and is served in a system of injection wells for the leaching of the lower layers of material, then pump the working solution from the leached metal through the system odajnyk wells and produce the allocation of a metal, for leaching of the lower layers of material use solutions environmentally friendly reagents, such as chlorides or thiosulfates.

Compared with the existing method, by combining the cuvette method of leaching from the upper layers of mineral mass and in-situ leaching from the main part of the object, allows to improve the completeness of extraction of metals through the separate processing of the leach solution is weakly filtering Honkarakenne mineral mass of the upper part of the material, ensuring full contact with the solution in the sintering process, the formation and stirring the slurry and well filtering relatively coarse fraction of mineral mass of the reagent solution supplied through the wells, and to reduce the cost of removing metal by reducing the length odajnyk and injection wells.

The method is implemented as follows. Pre-pass cell for mineral mass with the temporary storage of the extracted part with its possible agglomeration. From the ditch bottoms are drilling wells to a depth of leached layer and produce their set with the output of the upper part of t the UX above the level of the mouth, exercise equipment filters and aerolite (air lift). The upper part of the casing connecting the horizontally arranged pipes or hoses. At that separately connect the injection and these pumping wells. The bottom and sides of trenches compacted and dense cover waterproof films. Places of contact of the film with pipes fix the seals. Further mineral mass, extracted from the trenches, fed into the mixer, serving the pulp and then together with the leaching reagent is served in the cell or, if the mineral mass was subjected to agglomeration, it is poured into the cuvette and fill in the leaching solution. After leaching of metals from mineral mass, placed in the cuvettes, the solution is directed to adsorption or extraction columns, where they perform the extraction of leached metals. Obtained, after separation of productive solution of metal working solution doubleplay or replace the solution with other complexing agents and served in the injection well than produce the leaching of metals from the main part of the ore body or technogenic mineral formations. Next produce lift working solutions with leached metal through these pumping wells aerolite (air lift) and transfer them into tanks or mechanical filters and further sorption (or extrac the ion) columns, where extract the metals.

Example.

Darasunskoe tailings with an average grade gold mineral mass 0.87 g/T. the layer thickness (depth to soil) dry mineral weight is 5 to 8 meters. The underlying soil layer is an impermeable layer. The upper part of the sediment to a depth of 1.5-2 m presents Honkarakenne (30-70 μm) material. The filtration coefficient for this material does not exceed 0.1 m/day, so the leaching of gold, mostly dispersed, it can be effectively implemented only after agglomeration with the addition of a solution of sodium cyanide concentration of 2 g/l, cement and calcium oxide. Below these markers the size of the mineral particles is 50 μm - 500 μm. The filtration coefficient for this material is about 0.2-0.5 m/day, which is close to the optimal values for the RO. Therefore, the leaching of gold from the lower layer, it is better to perform the downhole method chloride-peroxide complexes. For implementing the method are the cell depth 1.5-2 m, length 30 m, width 5 m gold-bearing mineral mass with the temporary storage of the extracted part with its possible agglomeration of the above-mentioned mixture. From the bottoms ditch drilling of wells with diameter of 100 mm to the depth of the leached layer is up to 8 meters, produce their plastic casing pipes with what vodom the upper part above the level of the wellhead 2 m, the equipment slot filters, gravel backfill and aerolite (air lift). The upper part of the slots in future injection wells is left protruding relative to the bottom of the trench for subsequent bubbling of the solution in the cuvette leaching. The upper part of the casing connect horizontally spaced plastic hoses. At that separately connect the injection and these pumping wells. The bottom and sides of trenches compacted and dense cover waterproof films. Places of contact of the film with pipes fix special foam seals. Mineral mass, extracted from the trenches, mixed with cement, calcium oxide and fall asleep in a rotating drum, where the flow 0.2%cyanide solution prepared from the primary solution of soda or lye, past photoelectrochemical processing, prepare a mixture, from which by agglomeration receive pellets. Then the pellets are served in the cell. Then agglomerated mineral mass irrigated leaching reagent - a 0.02%solution of sodium cyanide to fill them cuvette. Through the pipe, with the speakers in place out of the bottom of the trench slits periodically (after 0.5 hours, 1 hour, pumped for bubbling compressed air setting at the top of the pipe stub to avoid losses and loss Rast is ora. Sparging provides an increase in the intensity and completeness of the process sample leaching. After leaching of metals from mineral mass, placed in the cuvettes, the solution is directed to adsorption columns filled with ion exchange resin And 100, where they perform removing the leached gold. Obtained after separation from the pregnant solution of the metal working solution serves separate sorption column with anion exchange resin of the type AM-2B in the form, where is extracted the main part of cyanides, served in the sludge, where and neutralize the remaining cyanide with sodium hypochlorite, pumping, injecting metered in him hydrochloric acid, passed through a photochemical reactor, which formed a connection with active chlorine, and pumped into the well. Active solution from the sump, getting into the injection well through cracks and gravel backfill, goes into mineral mass and produces the leaching of gold from the main part of the relevant section of the tailings pond. Next produce lift working solutions with leached metal through these pumping wells aerolite (air lift) and transfer them into tanks or mechanical filters and then to the sorption column, loaded with coal AG-3, which extract gold.

Method cell-situ leaching of metals from ores, special blade is in and stockpiled tailings, including the processing of mineral mass solution leaching reagent into cuvettes and the selection of metal from the pregnant solution, characterized in that the cuvette is formed on the leached mass in the bottom of the ditch construct a system of injection and odajnyk wells located above the level of the bottom of the cuvette and a depth of not less than lower grades leached layer mineral mass produce filling ditch agglomerated mineral mass or pulp made from previously learned material, process mineral mass in cuvettes solution leaching reagent and the selection of metal from the pregnant solution is then obtained after separation of the metal working solution doubleplay or replace with a solution of a different composition and served in the system of injection wells for the leaching of the lower layers of the material, and then pumped to the working solution from the leached metal through the system odajnyk wells and produce the allocation of a metal, for leaching of the lower layers of material use solutions environmentally friendly reagents, such as chlorides or thiosulfates.



 

Same patents:

FIELD: mining.

SUBSTANCE: method for leaching of precious metals from technogenic raw material involves preparation of open working-out or capacity, waterproofing of its walls and bottom, arrangement of mineral mass in it, supply of a leaching solution, proper leaching and extraction of precious metals. The invented method differs by the fact that arrangement of mineral mass is preceded with construction in the working-out or the capacity of a system of pumping-in and pumping-out pipes perforated in lower part at the level of a future root system of plants, and after mineral mass is arranged, seeds of young plants are planted in its upper layer, which are capable of accumulating precious metals in their tissues; supply and removal of the leaching solution is performed through the system of pumping-in and pumping-out pipes after the stage of active formation of plant root system; at that, as leaching solution, active low concentrated leaching solution is used, which has passed photoelectrochemical treatment, and extraction of precious metals is performed by sorption or electric sorption of its diluted forms from pumped-out solutions and its extraction from plants extracted from mineral mass when they each a certain size.

EFFECT: invention allows improving the extraction of useful components.

4 cl

FIELD: mining.

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EFFECT: invention allows improving leaching efficiency.

21 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: method includes drying of an industrial massif of stale tailings of upstream impoundments. Then the thickness of tailings is divided into non-productive strata including lean tailings from the upper part of the industrial massif, not exposed to hypergene changes, and productive strata from the base of the industrial massif enriched with gold and formed in the process of hypergene conversion. Then the circuit of the hypergene converted stratum is established. Afterwards tailings of upper non-productive strata are removed, and tailings of hypergene converted strata are processed. Processing is carried out by leaching with gold extraction. Gold extraction from tailings of hypergene converted productive strata is carried out with cyanidation.

EFFECT: invention provides for growth of gold production in sufficiently short periods due to simplified process cycle and reduction of time for preparation of secondary raw materials for processing.

3 cl, 1 tbl, 1 ex

FIELD: metallurgy.

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EFFECT: increasing complete combustion of powder charges and efficiency of action of charges; increasing efficiency of extraction of nickel and cobalt; reducing consumption of acid and simplifying the flow diagram.

18 cl, 4 tbl, 4 ex

FIELD: oil and gas production.

SUBSTANCE: proposed device comprises water feed tube with bottom head Note here that the latter features length exceeding radius of reservoir and is made of flexible water feed tube furnished with mechanical muscles secured thereto and pneumatically or hydraulically communicated with pressure source to control every muscle for positioning tube end in space.

EFFECT: higher efficiency.

3 dwg

FIELD: mining.

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EFFECT: ensuring stability of open pit side and rising safety level of mining operations.

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FIELD: mining.

SUBSTANCE: method for heap leaching of copper-zinc ores includes irrigation of material with mine waters, gathering of productive solution. Irrigation of material is performed by means of mine water, which has undergone electrochemical treatment with preliminary addition of the salt NaCl in amount of 1-20 g/l and after treatment is characterised by the following data: the value of pH - within 2-8; oxidation-reduction potential (ORP) - 600÷1200 mV; active chlorine ionic density - 50÷3000 mg/l; oxygen density - 15÷32 mg/l.

EFFECT: invention enables to raise effectivity of leaching and extraction of copper and zinc from ore material and to reduce the cost of finished product.

FIELD: metallurgy.

SUBSTANCE: method involves disintegration, heat treatment, leaching and precipitation of vanadium compounds. The slag is ground to a particle size from - 0.2 to - 0.3 mm, vanadium and other metals are transferred from the slag into a solution of sulphates of metals using the heat of exothermic chemical reactions, "vanadium slag - sulfuric acid aqueous solution," which is conducted at temperatures ranging from 75 to 85 °C, achieved by changing the acid concentration from 20 to 30% in proportion to the size of the leaching slag particles. Vanadium and other metals are precipitated as hydroxides by treating a sulphate solution with magnesium oxide at a ratio of MgO:H2SO4 from 1:2.6 to 1:2.7 and pH 10.0÷10.4 for reactions such as: MeSO4 + MgO + H2O → Me(OH)2 ↓ +MgSO4, (1) with a turnover of magnesium reagents in the interaction of MgSO4 with NaOH: MgSO4 + 2NaOH → Mg(OH)2 ↓ +Na2SO, (2) with a possibility of exchange of MgO in (1) Mg(OH)2 by (3): MeSO4 + Mg(OH)2 → Me(OH)2 ↓ +MgSO4, (3) using the reaction: Na2SO4+Ca(OH)2 ("lime milk")→2Na(OH)+CaSO4·2H2O (gypsum)↓, for turnover of the reagents of sodium and utilisation of gypsum obtained in the form of gypsum concrete, alabaster.

EFFECT: decrease in power consumption.

1 tbl, 1 ex

FIELD: mining.

SUBSTANCE: leaching component includes ore stock pile with surface spraying device, channel for collection of productive solutions with external berm, bed of solid waterproof film located under ore stock pile, as well as at the bottom, slopes and berm of the channel. External berm width is at least three times deeper than background seasonal melting of soils. Film bed edge is embedded in central part of berm through the value which is lower than depth of background seasonal melting of soils. The proposed design of the heap leaching component prevents leaks of productive solutions in case waterproof film is broken at stock pile bottom due to waterproof barrier made of film from above and waterproof frozen soils from below. Berm surface is covered with heat-insulating material during warm season. Upper part and external slope of berm are free from snow cover during cold season. Heat-insulating material is located under film bed at the bottom and channel slope opposite to stock pile and berm surface during warm season.

EFFECT: reducing environmental and economic risk of using heap leaching plants in permafrost zone, and reducing heat loss with productive solutions.

5 cl, 4 dwg

FIELD: mining.

SUBSTANCE: method involves arrangement of increased permeability of mining ore mass (MOM), action of reagents on MOM obtaining design content of useful components (UC) in the form of concentrated solutions. In order to obtain design contents of UC, MOM is changed over to permeable state by its mixing with water component of flooded technogenic sites till suspension of design density is formed. After the suspension achieves the design density, MOM UC is changed over to ionic condition by mixing the suspension with optimum solvent till design concentration of UC (mg/l) is formed in place of MOM resting. Then, suspension is settled in the same volume of technogenic site till the solution is clarified. At formation of suspension the silts can be used as MOM.

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2 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: invention can be used in the technology of obtaining the compounds of rare-earth metals at complex processing of apatites, and namely for obtaining of concentrate of rare-earth metals (REM) from phosphogypsum. Method involves sorption of rare-earth metals. At that, prior to sorption, phosphogypsum is crushed in water so that pulp is obtained in the ratio Solid : Liquid=1:(5-10). Sorption is performed by introducing to the obtained pulp of sorbent containing sulphate and phosphate functional groups, at the ratio of Solid : Sorbent=1:(5-10) and mixing during 3-6 h.

EFFECT: increasing REM extraction degree to finished product.

5 tbl, 5 ex

FIELD: metallurgy.

SUBSTANCE: method involves leaching of cadmium from raw material in solution of sodium ethylene diamine tetraacetate with its further extraction from solution and regeneration of ethylene diamine tetraacetate. Cadmium leaching is performed in two stages. The solution obtained at the first stage is supplied for extraction of cadmium, and residue of the first stage is supplied to the second cadmium leaching stage. The solution obtained at the second stage is used for leaching of cadmium from raw material at the first stage. Besides, leaching at the second stage is performed in presence of hydrogen peroxide at maintaining its concentration in the range of 10-15 g/dm3 during 2-2.5 hours.

EFFECT: increasing cadmium extraction degree.

2 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: method includes joint leaching and activation of raw materials in a cage mill with extraction of metals into a solution simultaneously with crystal damage. After leaching and activation in a cage mill the material is laid into stacks, piles or trenches, treated with a solution of sulphuric acid. After treatment with a solution of sulphuric acid the material is washed with water, afterwards leaching is carried out with solutions of reagents. At the same time treatment of the material in stacks, piles or trenches is carried out with a solution of sulphuric acid with concentration of 10-30 g/l. Leaching of the material in stacks, piles or trenches is carried out with a solution of a sodium sulfide trioxosulfate with concentration of 10-20 g/l.

EFFECT: higher efficiency of metals extraction from mill tailings due to additional chemical treatment of mechanically chemically activated structural components of extracted materials after their extraction in a cage mill.

3 cl, 4 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: method includes joint leaching and activation of raw materials in a cage mill with extraction of metals into a solution simultaneously with crystal damage. Prior to supply of raw materials into the cage mill, it in the mixture with elemental sulphur is previously treated with a solution of a mixture of sulphuric and nitric acids. Raw materials are mill tailings in the form of a pulp at the weight ratio of a solid phase to a liquid phase equal to 1:2. At the same time they are ground in the mixture with elemental sulphur in the amount of 12% relative to the mass of tailings to the size of 100% - 0.01 mm. Pulp treatment with a mixture of sulphuric and nitric acids is carried out at the weight ratio of the latter equal to 2:1 to bring the hydrogen index pH to the value of 1 with its further increase to the value 3 for 2 hours.

EFFECT: higher efficiency of metals extraction from mill tailings due to increased chemical activity of the latter.

2 cl, 1 ex

FIELD: metallurgy.

SUBSTANCE: method includes leaching of useful components from open grains of processed raw materials in a cage mill, when loading raw materials and leaching reagent simultaneously in it. Raw materials processed in the cage mill are additionally exposed to vibration in the horizontal plane with its tossing. At the same time exposure to vibration is carried out within the frequency of oscillations from 30 to 1500 Hz at amplitude of horizontal oscillations from 2 to 50 mm and amplitude of vertical tosses of up to 30 mm.

EFFECT: higher efficiency of metals extraction from mill tailings or off-grade raw materials due to considerable increase of leaching speed.

7 dwg

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of hydraulic metallurgy and may find wide application in metallurgical industry. The method for complex processing of iron ore with high content of magnesium compounds consists in the fact that prior to annealing the initial ore is treated with a demagnetising acid agent. The acid agent used is an anhydrous phosphoric acid. After treatment the mixture is exposed to oxidising decarbonising annealing at the temperature of above 650°C. The produced ash is treated with 10% aqueous solution of sulphuric acid, leached with water to produce pH of 6.5-7.0 in last portions of washing water. After leaching the concentrate is separated from washing water, dried and sent for iron smelting. Washing water is treated with ammonia until complete deposition of magnesium-ammonium phosphate, which after drying is sent for making fertilisers. The remaining aqueous solution is treated with quicklime to produce calcium sulfate residue, which is then dried and sent for use as a binding material. The remaining water is returned for leaching.

EFFECT: higher content of iron in a concentrate with simultaneous controlled reduction of magnesium oxide content in it.

1 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to electrolytic production of metallic lead from sweet lead paste that makes active part lead-acid accumulator. Method comprises the following steps: a) leaching of sweet paste by bringing it in contact with solution containing ammonium chloride to obtain solution after leaching and discharge of CO2 gas; b) separation of first solid residue and first clarified solution after leaching from step (a); c) leaching solid residue separated at step (b) by bringing it in contact with solution comprising ammonium chloride and hydrogen peroxide; d) separation of second solid residue and second clarified solution after leaching from solution after leaching from step (c); e) combining first clarified solution after leaching from step (b) with second clarified solution after leaching from step (d) to produce single solution; f) electrolysis of solution from step (e) in flow-through cell at current density of 50 to 10000 A/m2. Note here that electrolysis brings about mossy lead. Invention relates also to method of desulfonation of said paste.

EFFECT: higher yield and efficiency, simplified process.

26 cl, 6 dwg, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to mineral stock processing and may be used for extracting gold fractions of grain size smaller than 0.07 mm. Proposed method comprises preparing water suspension with addition of flocculating agent. Damped ground paper bulk is added to said suspension, paper bulk features reduced moisture resistance and mineral component-to-bulk ratio making 1: 0.05. Then, mix is mixed in mixer for 10 s. After mixing, paper bulk is separated on sieve with mesh size not exceeding 0.2 mm. Now, paper bulk is rinsed to produce concentrate to be dried and fused.

EFFECT: higher efficiency, lower costs.

1 ex

FIELD: metallurgy.

SUBSTANCE: method involves sintering of catalyst, leaching of sinter and deposition of aluminium at the first stage and molybdenum at the second stage from the solution. Catalyst is mixed with soda solution at solid-to-liquid ratio of 1:0.8÷1 prior to sintering. Soda consumption is taken based on 200-400 kg/t of raw material. The obtained sinter is subject to water leaching during 1-2 hours at temperature of 50-80°C. At that, molybdenum is deposited in the form of calcium molybdate at the second stage.

EFFECT: increasing molybdenum extraction efficiency.

3 cl, 1 ex

FIELD: metallurgy.

SUBSTANCE: method is carried out in two stages - melting and further reduction of a slag melt, sending the slag melt from the melting stage to the reduction stage is carried out in a direction opposite to motion of gaseous and dusty products, gaseous products of the melting and reduction stage are burnt above the melt of the reduction stage. The amount of oxygen in a wind supplied into the melt at the melting stage makes 0.9-1.2 from the theoretically required one to oxidise fuel carbohydrates to CO2 and H2O, amount of oxygen in a wind supplied for afterburning of gases above the slag melt of the melting stage makes 0.9-1.2 from the one theoretically required to oxidise components of effluent gases to CO2 and H2O, amount of the oxygen-containing wind supplied into the melt at the melting stage makes 500-1500 m3/m3 of the slag melt, the amount of the oxygen-containing wind supplied to the melt at the reduction stage makes 300-1000 m3/m3 of the slag melt. A furnace by Vanyukov is disclosed, in which a gas flue for joint removal of gases of melting and reducing chambers is installed in the end of the melting chamber dome at the distance of the reducing chamber above tuyeres of the upper row of the melting chamber along the vertical line in gauges of the lower row tuyere relative to the plane of the lower row tuyeres, the melting chamber bottom is arranged by 5-30 gauges below, the horizontal plane of upper row tuyere installation is by 30-80 tuyeres higher, the horizontal plane of lower row tuyeres installation in the reducing chamber is arranged below the upper edge of the vertical partition between the melting and reducing chambers by 40-85 gauges of the reducing chamber tuyeres.

EFFECT: lower mechanical dust carryover and toxic substances exhaust with effluent gases, reduced power and capital expenses, higher reliability, safety and operation life of melting and gas-cleaning equipment.

14 cl, 3 dwg

FIELD: metal recovery, in particular noble metals from technologically proof raw materials.

SUBSTANCE: method includes raw grinding to 0.2 mm; blending with batch containing halogen salts and/or oxygen-containing salts, and mixture opening: cake cooling, leaching with simultaneous reaction pulp agitation with hot water, and metal recovery from solution and insoluble residue. Opening is carried out in electrical furnace at 100-120oC preferably at redox potential of 1.8-2.6 V, by elevating of temperature up to 450-560oC at rate of 8-10oC/min and holding for 1-7 h at highest mixture redox potential. Opened and cooled cake is grinded and leached in opened agitator.

EFFECT: environmentally friendly method with increased yield; utilization of unconventional noble and non-iron metal sources.

1 cl, 2 tbl

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