Method for heap bacterial leaching of sulphide-bearing ore

FIELD: metallurgy.

SUBSTANCE: invention concerns hydrometallurgical manufacturing and can be used at bioleaching of sulphide products, containing various nonferrous and precious metals. Method of sulphide-bearing ore treatment includes ore leaching stacked on the watertight basis, located at slope, in heap has a form of rustum of pyramid. Leaching is implemented by means of sulfuric acid solution at concentration 2-10 g/l, containing ions of ferric iron by concentration 1-20 g/l, iron-oxidizing bacteria with microelements and sulphur-oxidizing bacteria. After collection of flowing out solution it is implemented iron regeneration in collected solution in separate instrument by immobilized on neutral bearer bacteria with aeration by air. Metals extraction is implemented from leaching solution.

EFFECT: increasing of metals extraction ratio, decreasing of treatment time.

4 cl, 2 ex

 

The invention relates to the hydrometallurgical production and can be used in the leaching project sulfide products containing various non-ferrous and precious metals. Currently, more attention is given to the process of hydrometallurgical processing of sulfide concentrates, one of which is the rise through the suspension by bacteria.

Resistant mineral raw materials non-ferrous, rare and noble metals processed pyrometallurgical, hydrometallurgical and combined methods (sulfamethizole roasting and leaching).

The main disadvantages of using pyrometallurgy is the high energy consumption and the formation of gas and dust that have harmful effects on the environment.

Hydrometallurgical extraction of metals from refractory mineral raw materials is carried out by leaching with the use of strong oxidizing agents (fluorine, chlorine, ammonia, nitric and nitrous acids, and others), with harmful effects on the environment and involving complex technology of extracting metals from leaching solutions.

Leaching of sulfide metals in sulfuric acid environment of trivalent iron is low-cost and environmentally friendly way, as in the composition of ores and products containing sulfides of metals, constituted the point of connection, during oxidation which in solution form necessary for the implementation of leaching sulphuric acid and iron ions.

There is a method of underground leaching of sulfide copper ores (EN 2124632, 6 EV 43/28, SW 3/08, publ. 10.01.99). When conditioning the mother liquor is conducted additionally, the oxidation of ferrous iron, the concentration of trivalent iron in the solution is maintained within the range of 0.5 to 30 g/l, the ratio of the concentration of trivalent iron to the sum of the concentrations of divalent or trivalent iron set equal to 0.5-1.0 and the concentration of divalent copper in the range of 0.5-5.0 g/l, while the leaching process is carried out in the presence of oxygen. Oxidation of ferrous iron in the solution is carried out by bacteria in the presence of oxygen or in the presence of pyrite. In addition, the solution produces the imposition of acoustic oscillations predominantly hydrodynamic emitters. The method improves the efficiency of leaching at lower reagent consumption and the possibility of carrying out the process under conditions of submerged copper mines

The disadvantage of this method, which reduces its efficiency, is the limit on the ratio of ion concentrations of ferrous and ferric iron. Optimal for leaching copper sulfide ores is minimal finding Zhelezov divalent form and maximum quantity in trivalent form. This condition determines the active bacterial regeneration of iron.

There is also known a method of selective leaching of metals (EP 1281779, SW 011/00, publ. 03.02.2003), in which mineral raw materials in contact in an aqueous solution with oxidizing agents sequentially in the following order: in the presence of oxygen, then oxygen and ozone and the oxygen, ozone, and the third reagent. After application of each step is the separation of the solid and liquid phases.

The disadvantages of this method is complicated leaching technology, including three operations divisions and the lack of selectivity of extraction of metals. For example, molestie sandstones contain copper and silver. Copper is oxidized minerals (malachite, brochantite), oxidizable acid without oxygen; secondary sulphides (chalcocite, covellite), partially oxidized by sulfuric acid, inefficient oxidized by oxygen, only ozone; very resistant mineral is chalcopyrite, which will oxidize only ozone and more strong oxidizers; silicate of copper chrysocolla, to extract copper from which in certain conditions, ozone and third oxidizer ineffective. Similarly, the silver is contained in the second and third solution.

The closest analogue of the claimed invention is a method of high-temperature wimalasiri is in heaps (US 6802888, SW 3/18, publ. 12.10.2004). In this way the ore heap has a height of 2.5 m and a width of 5 m, contains particles of sulfide mineral in an amount to provide content in a pile of 10 kg of sulfide sulfur per 1 ton of solid components, and more than 25% of the sulfide minerals are halogen copper sulfide, which is more than 50% of the copper present in the heap. A significant part of the heap is heated to a temperature of 50°and more. In a heap enter the seed culture containing at least one strain of thermophilic microorganisms capable of biologically leaching of sulfide minerals at a temperature of more than 50°C. Heap leaching process with a solution containing sulfuric acid and ions of iron (III). When leaching project is the biochemical oxidation of the particles of sulfide mineral, corresponding to the oxidation of more than 10 kg of sulfide sulfur per tonne of solids, and the dissolution occurs more than 50% of the copper present in the heap, in the leaching solution of 210 days or less from creating piles. A concentrated solution containing dissolved copper, gather to extract copper.

The disadvantages of the method are significant energy costs for heating the heap to a temperature of more than 50°C, the dependence of the process from the state of the bacteria, the complexity of the management process parameters is selecive in this way, in particular, the concentration of oxidant ferric sulphides, as there is no possibility of its regeneration outside the heap. The activity of thermophilic cultures of bacteria to a greater extent than mesophilic depends on the physical and mineral composition of the ore, i.e. they are the most sensitive, or you can say capricious. In addition, for the life of thermoflow require organic substrate, which is added to usually the biomass of yeast cells or mesophilic strains Glazovskaya bacteria, and trace elements not provided for in this invention.

The invention achieves the following technical result: increasing the degree of extraction of metals, reducing the time of processing.

This technical result is achieved as follows.

Method for processing sulfide-bearing ore, which consists in leaching the ore, composed on the basis waterproof below the slope, in a heap, having the form of a truncated pyramid, with an aqueous solution of sulfuric acid at a concentration of 2-10 g/l, containing ferric ions concentration of 1-20 g/l, zhelezookisnye bacteria with minerals and sewagesludge bacteria, collecting the resulting solution, the regeneration of iron in the collected solution in a separate apparatus immobilized on a neutral socialbutterfly with aeration air, extraction of metals from the leaching solution.

At the same time as minerals are salts of nitrogen and phosphorus.

In addition, as a neutral carrier use expanded clay.

As a neutral carrier also use the glass.

Sulfuric acid is a reagent involved in the oxidation of sulphides, regeneration of iron ozone and bacteria. Oxidant sulphides in this method of leaching are ferric ions that are in solution of sulfuric acid. When the concentration of sulfuric acid of more than 2 g/DM3the ferric ions precipitate, and oxidative action stops. This may occur inside the heap, when sulfuric acid is consumed, therefore, for the effective decomposition of sulphides, you must submit a leach solution containing such an amount of acid, so that after passing through the layer heap concentration did not fall below 2 g/DM3. With this purpose it is necessary to maintain the sulfuric acid concentration in the solution fed to the leaching of not less than 2 g/DM3. Sulfuric acid concentration of 2-10 g/l allows to provide a process for the oxidation of sulfides regeneration of iron bacteria and simultaneously corresponds to the values at which ferric ions are in solution, not attack the Ute in the sediment and oxidized sulfides.

With increasing concentration of iron in the leaching rate of leaching increases, but for the effective separation of the metals from solution poor mineral raw materials, which are usually used for heap leaching and in which the number of metals and sulfide minerals is low, it is sufficient to apply the solution with a concentration of not less than 1 g/DM3. Most sulfide ores of the metals they contain the minerals iron - soluble or soluble used in the invention with a solution containing ferric ions in sulfuric acid. In the leaching of iron from the ore passes into solution and its concentration increases oxidative effects increases. When the concentration of iron more than 20 g/DM3may be iron in the sediment, since at higher concentrations the pH value at which begins the sediment below.

After exposure to sulfide minerals trivalent iron goes in the divalent form and ceases to act on sulfide minerals. Oxidation of ferrous iron by bacteria partially takes place directly in the heap, but living conditions and oxidizing action of bacteria in the heap are often adverse, such as not enough oxygen, low or high temperature. As a result, the solution of the Les leaching contains divalent iron. For the regeneration of the oxidizing properties of iron, i.e. move it to the trivalent state, the most inexpensive way is to use Glazovskaya bacteria. The process is performed in a separate apparatus, which receives the collected solution, bacteria from the cultivator, and the aeration air. The increase in the rate of iron oxidation is achieved by increasing the concentration of bacteria. The most reliable way to create a high concentration at the lowest cost is the immobilization of bacteria on a neutral carrier. In this case, the bacteria attached to the media, have an oxidizing effect on the ions flowing solution and are not washed out of the apparatus onto the solution.

The oxygen contained in the feed to the leaching of the air required for breathing bacteria and is involved in the oxidation of bacteria bivalent iron ions.

On the reproduction rate and the activity of the bacteria is affected by the availability of necessary minerals, mainly potassium, nitrogen and phosphorus. These items can be submitted for bacterial leaching in the form of salts, for example potassium phosphate, ammonium sulfate, and mineral products, in particular, which is the waste chemical and metallurgical industries.

For oxidation formed during the oxidation of Sul is the Idov sulfur leaching is carried out with the addition of cultures serratissima bacteria, living conditions are close to the conditions Glazovskaya bacteria. As a result of oxidation of sulfur bacteria, it forms sulfuric acid, which is used for leaching.

Materials with a well-developed surface and porosity, as well as the ability to attach bacteria, cheap with established production are the clay and fiberglass.

After leaching the sulfide products are separation into solid and liquid phases, for example by sedimentation or filtration, followed by extraction of metals from the separated phases.

Example 1.

Heap leaching of copper from copper sulfide ore Udokan Deposit containing 1,56% copper, including irrigation ore particle size of 5.0 mm, placed on a waterproof base with a slope of 5° in a heap, was carried out at a temperature of 20°With a water solution containing sulfuric acid at a concentration of 5 g/DM3and sulphate of oxide of iron in iron-ion concentration of 3 g/DM3, zhelezookisnye and sewagesludge bacteria. Collected after percolation through the ore solution containing 5.8 to 8.7 g/l of iron, send in a tubular reactor filled with fiberglass and immobilized on the glass zhelezookisnye bacteria. The reactor was Aeronavale air is m, contained in the feed to the reactor a solution of ions of ferrous iron was oxidized and the output iron contain only trivalent ions. Coming out of the reactor solution was heading for irrigation of the heap of ore. When the concentration of copper in the leaching solution over 2 g/DM3from the solution is the extraction of metals by the method of solvent extraction followed by electroextraction. Time of passage of the solution through the reactor was sufficient for complete oxidation of iron. The oxidation rate was increased from 1 g/l per hour to 9.4 g/l per hour. Time heap leaching of copper from ore decreased from 174 days to 145 days when removing 86%.

Example 2.

Heap leaching of sulfide copper-zinc ores, containing 5.1% zinc and 0.8% copper particle size of 10.0 mm, placed on a waterproof base, carried out by the flooding of ore stacked in a heap in the form of a truncated cone, with an aqueous solution of sulfuric acid concentration of 10 g/DM3containing sulfate iron oxide concentration of iron ions 15 g/DM3and zhelezookisnye bacteria.

The solution resulting from the heap, was oxidized in a VAT filled with expanded clay, with immobilized zhelezookisnye bacteria and aeration air. Contained in the feed to the reactor a solution of ions of ferrous iron was oxidized to trivalent and output iron soderholm trivalent ions. Coming out of the reactor solution was directed to the top surface of the ore heap. Zinc and copper were extracted from the leaching solution. The recovery rate of iron in the tank with immobilized biomass was 11.2 g/l per hour. Extraction of zinc from ore for 165 days was 89%, copper - 81%.

1. Method for processing sulfide-bearing ore, which consists in leaching the ore, composed on the basis waterproof below the slope, in a heap, having the form of a truncated pyramid, with an aqueous solution of sulfuric acid at a concentration of 2-10 g/l, containing ferric ions concentration of 1-20 g/l, zhelezookisnye bacteria with minerals and servicessome bacteria, collecting the resulting solution, the regeneration of iron in the collected solution in a separate apparatus immobilized on a neutral carrier of the bacteria with the aeration air and the extraction of metals from the leaching solution.

2. The method according to claim 1, in which the microelements use salt containing nitrogen and phosphorus.

3. The method according to claim 1, in which as a neutral carrier use expanded clay.

4. The method according to claim 1, in which as a neutral carrier use the glass.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: method of vat bacterial leaching consists in leaching of crumbled, sulphide containing product in water solution of sulphuric acid at value of pH 1.5-2.0 and temperature 10-40°C. Leaching is carried out at presence of ions of trivalent iron of concentration 5-20 g/l, iron oxidizing bacteria of concentration 105 kl/ml and microelements aerated with gas mixture of air and ozone. Contents of ozone in gas mixture are at amount of up to 0.01 vol %. Leaching solution is divided into solid and liquid phase.

EFFECT: upgraded degree of metal extraction out of sulphide containing product and accelerated rate of leaching.

3 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to hydro metallurgical method of extracting metals out of complex minerals and can be used at processing of bases and below-line ores, containing non-ferrous and precious metals. The method of extracting metals out of containing precious metals complex ores includes at the first stage close leaching by means of supplying water solution of sulphuric acid onto the heap of ore piled on a water-proof base till the concentration of acid in the solution after leaching reaches not less, than 1.5 g/dcm2, at the second stage water solution of sulphuric acid containing ions of trivalent iron of concentration not less, than 3 g/l, iron oxidising bacteria and micro elements is supplied. At the third stage of leaching water is supplied till neutralisation of the solution flowing out of the pile, at the fourth stage there is supplied alkaline solution of cyanide at pH of 10-12. At each stage productive solutions flowing out of the pile are collected and settled, then metals are extracted and solutions are returned into a corresponding stage for leaching of ore.

EFFECT: increased complexity of raw material utilisation and of extraction of metals out of ore.

10 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to hydro-metallurgical production and can be implemented at heap leaching of suplhide products, containing various non-ferrous and precious metals. The method includes leaching of sulphide containing ore stacked in a heap on a water impregnable base with water solution, containing sulphuric acid of concentration 2-10 g/l, trivalent iron ions 1-20 g/l and iron oxidising bacteria with microelements. Regeneration of bivalent iron is performed in a liquid phase of leaching in a separate assembly; it is performed by means of iron oxidising bacteria with aeration with ozone-air mixture at concentration of ozone 0.5-5 mg/l and consumption 0.1-1 l per litre of a treated liquid phase in a minute and at pH 1.5-2.2.

EFFECT: increased degree of metal extraction out of sulphide containing product and increased rate of leaching.

4 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to bio hydrometallurgical process of extraction of gold out of complex sulphide concentrates containing pirrotin, arseno pyrite, pyrite, and antimonite. The association of microorganisms consists of Sulfobacillus olympiadicus BKM B-2420 D, Ferroplasma acidiphilum BKM B-2421 D, Ferroplasma acidiphilum BKM B-2422 D, and Leptospirillum ferrooxidans BKM B-2423 D. The association of microorganisms is extracted out of working industrial reactors of gold extracting factory and is designed for oxidation of a sulphide gold containing concentrate. The association of microorganisms combines ferrooxiding, sulphuroxiding and sulphideoxiding properties, appeared simultaneously at oxidation of all sulphide compounds of commercial ore concentrate.

EFFECT: facilitates increased activity and expanding of process capabilities of association.

4 tbl, 3 ex

FIELD: extraction of copper from chalcopyrite.

SUBSTANCE: proposed method includes (a) oxidation of sulfur in chalcopyrite solution at definite conditions of interaction and release of at least part of copper contained in chalcopyrite into solution followed by stage of reduction of sulfur in solid product from stage (a) to sulfide at definite conditions of interaction and oxidation of sulfur in solid product from stage (b) by solution at definite conditions of interaction and release of at least part of residual copper in solid product into solution in form of copper ions at stage (c). Proposed method includes additionally extraction of copper from one or more solutions of stages (a) and (c).

EFFECT: increased rate of leaching-out and extraction of copper into solution.

23 cl, 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: hydrometallurgical processes; processing of sulfide products containing non-ferrous and noble metals.

SUBSTANCE: proposed method consists in bacterial-chemical leaching; moderately thermophilic bacteria Sulfobacillus are used in this method. Leaching is performed at two stages: first stage is carried out at intensity of mixing of 1-4 W/l without additional aeration at temperature of 60-80°C and pH of 1.6-1.7; second stage is performed at intensive aeration and mixing at volumetric coefficient of mass exchange by oxygen of 200-800-1 h at temperature of 50-55°C, pH of 1.3-1.5 and concentration of solid phase of 1-5%.

EFFECT: reduction of power requirements; high degree of extraction of non-ferrous metals.

1 ex

FIELD: hydro-metallurgy of noble metals; bio-hydro-metallurgical extraction of noble metals from sulfide gold-bearing concentrates.

SUBSTANCE: proposed method includes grinding, flotation and bacterial leaching-out of sulfide concentrate and cyaniding of bacterial leaching-out products. Bacterial leaching-out is carried out with the use of gas-and-air mixture preheated to temperature of 40°C which is fed to reactor where it is subjected to bubbling through concentrate mixture and bacterial solution at temperature of solution of 18-25°C.

EFFECT: reduced time for technological process due to increased rate of oxidation of sulfides at bacterial leaching-out.

4 ex

FIELD: hydrometallurgy; methods of extraction of gold from persistent gold-arsenic ores and concentrates.

SUBSTANCE: the invention is pertaining to the field of hydrometallurgy and is used for extraction of gold from persistent gold-arsenic ores and concentrates of different compositions, in which the fine-dispersed gold is contained in the sulfide minerals and is unavailable in case of application of traditional industrial cyanide process. The method of processing of persistent gold-arsenic ores and concentrates of a BIOS-M includes a flotation concentration of the source raw, washout of the pulp of the produced concentrate from cyanides up to concentration of NaCN - 0.05-0.1 mg/l, the concentrate bio-oxidation, a two-stage neutralization of the products of bio-oxidation, a sorption cyanidation and a desorption of gold and silver. The bio-oxidation process is conducted in four stages at the temperature of 37-42°C. At the bio-oxidation process the pulp pH on the second stage is kept on the level of 1.90-1.85, on the third stage - on the level of 1.8-1.82 with the help of feeding of the source concentrate or a crushed limestone, or lime. Before the flotation concentration of the source raw there may be conducted its gravity concentration. For optimization of the process a part of the pulp with an active biomass of bacteria from the second and third stages of bio-oxidation of the concentrate is fed back in the first stage of bio-oxidation. The technical result is a significantly increased speed of the process.

EFFECT: the invention ensures a significant increase of speed of the process.

4 cl, 1 dwg, 3 tbl

FIELD: mining and metallurgy industry.

SUBSTANCE: the invention is pertaining to the field of mining and metallurgy industry and may be used for extraction of gold from gold-sulfide ores of a different mineral composition. The method provides for a coarse breaking of ore, its fine crushing with grading, flotation concentration, bacterial leaching of sulfide flotation concentrate, neutralization of products of bacterial leaching of a sulfide flotation concentrate, a sorption leaching of the neutralized products of bacterial leaching of a sulfide flotation concentrate, joint sorption leaching of tailings of the sorption leaching of the neutralized products of the bacterial leaching of a sulfide flotation concentrate and flotation tailings, a desorption of gold from a saturated sorbent, electrolytic reduction of gold from eluates, smelting of the cathode deposits onto a bullion of Dore alloy. The bacterial leaching of sulfide flotation concentrate is conducted a stage by stage at the temperature of 37-45°C using different communities of bacteria at each stage, with temperature rise on the last stages. Neutralization of the products of the bacterial leaching of the sulfide flotation concentrate is conducted at aeration of the pulp by a compressed air, and after the aeration they conduct an oxidation of the pulp by oxygen and its cyanidation hardening. The sorption leaching of the neutralized products of the bacterial leaching of the sulfide flotation concentrate conduct at the fractional dosing of cyanide. The technical result of the invention is an increased extraction of gold at a decreased consumption of cyanide.

EFFECT: the invention ensures an increased extraction of gold at a decreased consumption of cyanide.

5 cl, 3 dwg, 5 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: method includes mixing of source concentrate with calcium oxide CaO and calcium peroxide CaO2 and burning in two stages. At the first stage burning is carried out at temperature of 350-500°C within 30-40 minutes, at the second stage - at temperature of 500-800°C during 30-60 minutes. After burning there is performed leaching of non-ferrous metals out of cinder. Consumption of calcium oxide CaO is 50-100% from stoichometric required for binding sulphur into gypsum while consumption of calcium peroxide CaO2 is 1-10% from concentrate weight.

EFFECT: increased extraction of non-ferrous metals and reduced duration of cinder leaching.

2 cl, 2 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: before leaching ore is broken and ground to size of 60-70% not more, than 3.0 mm. Leaching of ore is carried out in vats at mixing within 60-120 min with solution of sulphuric acid of primary concentration 10-40 g/l and solid phase contents 50-70%. While leaching during the first 40 minutes concentration of sulphuric acid is maintained within limits of not less, than 10 g/l. After completion of leaching solid and liquid phases are separated and copper is extracted out of leaching liquid phase.

EFFECT: increased extraction of copper out of ore and leaching kinetics and reduction of sulphuric acid consumption and duration of leaching.

6 cl, 6 tbl, 5 ex

FIELD: metallurgy.

SUBSTANCE: method includes breaking and grinding of ore to size of not more, than 0.074 mm, and collective flotation of sulphide and oxidised copper minerals into collective flotation concentrate. After dehydration of concentrate there is performed leaching and mixing with participation of oxygen containing ecologically harmless oxidant at contents of solid phase of 10-50% in water solution of sulphuric acid of 10-80 g/dcm3 concentration at temperature 20-70°C and at presence of trivalent iron ions of 2.0-15.0 g/dcm3 concentration. Cake of leaching is dehydrated and washed, after what liquid phase of leaching is merged with cake washing water. Further merged solution is clarified and copper is extracted out of merged solution thus producing cathode copper.

EFFECT: increased extraction of copper and depth of ore processing; producing commercial output in form of cathode copper and increased ecological compatibility.

11 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: method includes dry breaking and grinding of ore to size of not more, than 1.0-4.0 mm, ore leaching and mixing, when contents of solid phase is 50-70% with solution of sulphuric acid of 10.0 to 40 g/dcm3 within 0.5-2.0 hrs. After leaching generated cake is dehydrated, washed, subject to neutralisation and crushed to size of 60-95% class - 0.074 mm. Flotation of copper minerals with production of flotation concentrate is carried out. Solution after leaching of ore and cake wash water are merged and freed from solid suspension; then cathode copper is extracted out of them.

EFFECT: reduced consumption of sulphuric acid and water for process; increased extraction of copper out of ore and upgraded quality of consumer products.

8 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: method of vat bacterial leaching consists in leaching of crumbled, sulphide containing product in water solution of sulphuric acid at value of pH 1.5-2.0 and temperature 10-40°C. Leaching is carried out at presence of ions of trivalent iron of concentration 5-20 g/l, iron oxidizing bacteria of concentration 105 kl/ml and microelements aerated with gas mixture of air and ozone. Contents of ozone in gas mixture are at amount of up to 0.01 vol %. Leaching solution is divided into solid and liquid phase.

EFFECT: upgraded degree of metal extraction out of sulphide containing product and accelerated rate of leaching.

3 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: method of extraction of sulphide containing ores includes at first stage feeding of water solution of sulphuric acid onto crumbled ore stacked in heap on impervious bed till concentration of not less, than 2.0 g/dcm3 is achieved in solution after leaching, at second stage there is performed feeding of water solution of sulphuric acid containing ions of trivalent iron of concentration more, than 3 g/dcm3. Then productive solutions flowing out of heap are collected and settled, and bivalent iron is oxidized in them with compounds of active oxygen. After metals have been extracted out of productive solutions they are returned for ore leaching.

EFFECT: upgraded degree of sulphides decomposition and extraction of metals; reduced time of leaching, simplicity and low cost of implementation of method and ecological compatibility of process.

10 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to hydro metallurgy of copper as well as other non-ferrous metals by method of extracting out of sulphuric acid solutions with organic extragent and by means of electro extraction, particularly by heap, underground and vat leaching of ore, as well as concentrates, dumps, tails, slag and so on out of solutions. The technical result of the this invention is reduced costs for processing due to reduced cost and consumption of extragent, upgraded quality of the finished product - cathode copper, increased extraction of copper out of solution. The method of copper extraction out of containing iron sulphate solutions includes extraction of copper with cation exchanging organic extragent and production of copper containing extract and stripped raffinate. Further the extract is washed from iron, and re-extraction of copper out of washed extract is performed with production of re-extract and extragent. Cathode copper and spent electrolyte are produced from re-extract by means of electro extraction.

EFFECT: reduction of process costs due to reduced cost and consumption of extragent, upgraded quality of finished product - cathode copper, increased extraction of copper out of solution.

15 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to copper metallurgy, particularly to methods of processing of sulphide oxidised copper ores. The method includes dry crumbling and further crushing of ore to the size of not more, than 1.0-4.0 mm, leaching of ore at mixing and contents of the solid phase of 50-70% with solution of sulphuric acid of concentration from 10.0 to 40 g/dcm3. After dehydration and washing out of cake of leaching ore neutralisation and crushing of cake is carried out to the size of 60-95% class - 0.074 mm, further flotation of copper minerals out of leaching cake is performed with production of flotation concentrate. Leaching of flotation concentrate is carried out at mixing in water solution of sulpuric acid of concentration 10-80 g/dcm3 at temperature of 20-55°C with use of ozone and at presence of ions of trivalent iron of concentration from 2.0 to 15 g/dcm3. Then dehydration and washing out of concentrate leaching cake is executed; ore leaching liquid phase is merged with washing out waters of concentrate leaching cake, produced copper containing merged solution is freed from suspended solids and copper is extracted from merged solution with production of cathode copper.

EFFECT: reduction of sulphuric acid consumption for processing, increased extraction of copper out of ore, upgraded quality of commercial products of cathode copper.

8 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to copper metallurgy, particularly to methods of processing of sulphide oxidised copper ores as well as process products, tails and slag, containing oxidised and suplhide minerals of non-ferrous metals. The method includes dry crushing, crumbling of ore to the size of 60-95% class 0.074 mm, floatation concentration of crushed ore with extraction of the copper sulphide minerals concentrate at the first stage, while at the second stage copper oxidised minerals concentrate is extracted from the rest ore. Further leaching is carried out at mixing of copper concentrate of copper oxidised minerals with solution of sulpuric acid of concentration from 10.0 to 50 g/dcm3, and leaching at mixing of copper sulphide concentrate with using of ozone in water solution of sulphuric acid of concentration 10-80 g/dcm3 at the temperature of 20-70°C at presence of ions of trivalent iron of concentration 2.0-15.0 g/dcm3. Then dehydration and washing of leaching cakes is performed; leaching and washing solutions are merged, the merged solution is freed from suspended solids, and copper is extracted out of solutions with production of cathode copper.

EFFECT: increase extraction of copper, increased efficiency of ore processing and production of whole commercial output as cathode copper.

11 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to hydro-metallurgical production and can be implemented at heap leaching of suplhide products, containing various non-ferrous and precious metals. The method includes leaching of sulphide containing ore stacked in a heap on a water impregnable base with water solution, containing sulphuric acid of concentration 2-10 g/l, trivalent iron ions 1-20 g/l and iron oxidising bacteria with microelements. Regeneration of bivalent iron is performed in a liquid phase of leaching in a separate assembly; it is performed by means of iron oxidising bacteria with aeration with ozone-air mixture at concentration of ozone 0.5-5 mg/l and consumption 0.1-1 l per litre of a treated liquid phase in a minute and at pH 1.5-2.2.

EFFECT: increased degree of metal extraction out of sulphide containing product and increased rate of leaching.

4 cl, 2 ex

FIELD: non-iron metallurgy, in particular reprocessing of copper containing sulfide materials.

SUBSTANCE: invention relates to reprocessing of copper containing materials to produce solutions useful for copper recovering. Method includes two-step autoclave leaching with sulfuric acid. The first step is carried out with limited copper converting into solution. On the second step precipitate is fully leached with fresh sulfuric acid solution while maintaining specific ratio of liquid and solid phases. Method of present invention makes in possible to produce in both leaching steps copper containing solutions of desired composition.

EFFECT: improved method for copper recovering, reduced capacity of autoclave equipment.

23 ex, 1 tbl

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