Method for copper extraction from sulfuric solutions, containing ferrous iron ions

FIELD: metallurgy.

SUBSTANCE: invention concerns copper hydrometallurgy by extraction method from sulfuric solutions by organic extractants, and elecro extraction. Particularly from solutions of ore leaching by means of dense, subterranean and vat method and also from concentrates, dumps, sledges, slugs etc. Method for copper extraction from sulfuric solutions, containing copper ions and ions of ferrous iron includes treatment of solution by oxidant containing active oxygen forms, and copper extraction by 2-3 stages by blending of treated copper-bearing solution with solution of organic cation-exchange extractant. After extraction it is implemented mixture separation by sedimentation with receiving copper-bearing extract and raffinate. Copper re-extraction from extract is implemented by 1-2 stages of extract blending with solution of sulfuric acid or treated electrolyte with further separation of mixture by sedimentation with receiving re-extract and extractant solution. From re-extract it is implemented re-extraction of copper with receiving of cathode copper and spent electrolyte.

EFFECT: reduction of extractant consumption, increasing of copper extraction selectivity, increasing of cathode copper quality.

8 cl, 2 ex

 

The invention relates to hydrometallurgy of copper, and ferrous other non-ferrous metals, obtaining metals by the method of extraction from sulfuric acid solutions of organic extractants and electroextraction, particularly from solutions leaching of the ore heap, underground and cenowym ways, as well as concentrates, waste, sludge, slag, etc..

In the USSR were widely used extraction of copper from aqueous solution by precipitation in the form of cement residue on the iron scrap - cementation. The method is characterized by a low quality product, high cost of further processing, the high cost of the acid and the value of scrap iron. Despite the shortcomings, this outdated process and currently often used in hydrometallurgy of copper.

In the modern world metallurgical practice there are two main methods to extract pure metals from solutions of - way "solvent extraction - electroextraction" (SX-EW) and ion-exchange sorption. Both solve the same task - selective isolation of target metal of the multicomponent "dirty" solution.

The known method of extraction of copper from copper sulfate contained in the concentrate, such as chalcopyrite (US 6503293, SW 3/08, publ. 07.01.03). A fine powder concentrate containing copper sulfide, dispersed in aq is m sulfuric acid solution to form a slurry and add the required amount of surface-active substances, for example lignosol or quebracho. The mixture is subjected to heating at an elevated pressure oxygen-containing gas for the extraction of copper from concentrate. In the end you get a copper and a solid residue. Then the solution containing the copper is separated from the solid residue.

The extraction method is not selective in a pair of copper-iron, which does not allow to obtain high-quality commercial products, and difficult to implement at high temperature and pressure).

There is also known a method of selective extraction of non-ferrous metals ions from aqueous solutions (EN 2203969, SW 3/26, publ. 10.05.03). Process for the selective extraction of ions of non-ferrous metals from aqueous solutions, including contact of the extractant and the solution, stirring the mixture, settling and separation of the phases, wherein the selective extraction of non-ferrous metals carry out a fractional extraction with a gradual change in the pH of the solution and maintaining the modified pH at each periodic extraction, the extractant using CYANEX 272, the active component of which is di(2,4,4-trimethylpentyl)phosphinic acid, and removing mainly of copper ions carry out the extraction at pH 4-5, cobalt at pH 5-6, Nickel at pH 6-7.

In this method of extraction is used, the selectivity of the extractant to the different metals at different the conditions of acidity. However, the used extractant related to phosphinic acids, do not show selective properties in a pair of copper-iron, respectively, does not allow to obtain high-quality commercial products.

The closest analogue of the claimed invention is a method of processing copper-containing products (EN 2178342, WV 7/00, publ. 20.10.02). The liquid phase is subjected to extraction with separation of the raffinate and copper-bearing extractant solution. The method is reextracted of copper from copper-bearing extractant solution and regeneratory extractant used in the extraction and clean the copper-containing solution is subjected to electroextraction, after which the spent electrolyte used for Stripping. The extraction is carried out by contacting a copper-containing solution (liquid phase product) with an organic cation-exchange extractant type.

The disadvantage of this method is the lack of cleaning fluids from contaminating metal ions and therefore requires the use of expensive selective for copper extractants.

The invention is achieved technical result, which was to reduce the flow of extractant, increasing the selectivity of the extraction of copper, improving the quality of cathode copper.

This technical result is achieved as follows.

The method of extracting copper from chamois is acidic solutions, containing copper ions and ferrous ions, which consists in the treatment of oxidant solution containing active oxygen forms, extraction of copper in 2-3 steps of mixing the treated copper-containing solution with a solution of an organic cation-exchange extractant, separating the mixture by settling with obtaining a copper-containing extract and the raffinate Stripping of copper in 1-2 steps from the extract by mixing the extract with a solution of sulfuric acid or spent electrolyte and separation of the mixture by settling with getting realstrat and mortar extarget, electroextraction of copper from reextract to produce cathode copper and spent electrolyte.

When this extract is made from copper sulfate solutions leaching the ore or concentrate enrichment containing ferrous ions.

In addition, processing sulfuric acid solution containing ferrous ions, carried out with ozone and/or hydrogen peroxide.

At the same time mixing in the processes of extraction and re-extraction is 2.0÷10.0 min, settling in the processes of extraction and re-extraction is 2.0÷10.0 minutes.

The solution used for extraction, has a pH value of 1.5÷3,0.

Reextraction copper from the extract to provide a sulfuric acid concentration of 40÷ 200 g/l

Also, the processes of extraction and re-extraction is performed in countercurrent mode.

Copper-containing solution formed by leaching of ore underground, heap and cenowym methods, contain in addition to copper ions of other metals, most often in a large number of iron ions. Iron can fully or partially be extracted together with copper, polluting the end result of commodity products and reducing their quality. To prevent this phenomenon designed and synthesized selective copper extractants, in particular class oksioksana ketoxime and aldoxime. Selective extractants primarily on copper, which in solution is in the divalent form. In this regard, the extractants capture when contacting the divalent ions is greater than trivalent.

The oxidation of divalent iron ions to reactive oxygen species are formed ferric ions which are not captured by cation exchange extractants. Ozone and hydrogen peroxide in the oxidation of iron do not form containing compounds that form of suspended solids and worsen the extraction process.

For successful application of the extraction process is of great importance to the choice of extractant is an organic substance that forms with the metal compounds capable extracted in the organic phase./p>

If in acidic sulphate solutions of copper is in the form of a divalent cation, for its extraction in the organic phase is suitable reagents, extracting metals by cationic mechanism.

Extraction the extraction of copper cation exchange organic extractant in General can be viewed as the exchange reaction

2(HR)+CuSO4-CuR2+H2SO4

The operation method is as follows.

Copper sulfate solution is mixed with a solution of an organic cation-exchange extractant type, the extractant captures metal ions, the mixture is settled and stratified on copper extractant solution with a high content of copper, including iron, and the remaining metals of the solution raffinate concentration of sulfuric acid in which the cation exchange reaction is increased.

Copper extractant solution is subjected to Stripping by contact with a solution of sulfuric acid concentration 140-200 g/DM3. This concentration of the acid provides a high degree of extraction (Stripping) of copper from the loaded organic.

After settling allocated net copper sulphate solution - reextract and the regenerated organic extractant, which is reused in the extraction.

Rext who act first are usually cleared, then provocat electroextraction emitting cathode and copper spent electrolyte.

The spent electrolyte due to what is happening in the process of electroextraction chemical processes doubleplays acid, sulfuric acid concentration increases, so it is used when Stripping. This allows to reduce the consumption of sulphuric acid on the implementation process and copper losses.

After Stripping copper from a solution of an organic copper-bearing extractant regenerated extractant used in the extraction.

The pH value of the starting solution at 1.5 to 3.0 allows you to prevent decomposition of the organic phase, taking place under the action of acid, and to avoid loss of different kinds of precipitation, which can contaminate the organic phase and to prevent separation of the phases, to reduce the technical characteristics of the process.

The contact time of the phases on the stages of extraction and re-extraction within 2-10 min allows to maintain a high degree of extraction of copper while maintaining the high performance extraction installation.

The time separation of the extractant solution (organic and aqueous phases in the stages of extraction and re-extraction depends on the composition of the extractant, in particular diluent and a liquid phase and is determined to implement in a short time, usually within 210 minutes.

The application of the extraction mode simple counter allows you to more fully extract the copper from the solution, as in this case, a poor solution in contact with less saturated organic extractant.

Extraction of copper from solutions in one stage does not always provide a sufficient degree of extraction of copper from sulfate solution, as and when one stage of Stripping cannot show all the copper in the acid solution. To reduce copper losses with the raffinate after the first stage extraction depleted solution is subjected again to the mixing with the solution of the extractant extraction and carry out the extraction in two or three stages. The number of stages of Stripping is usually smaller than the stages of extraction.

Examples of implementation of the method.

Example 1.

Extraction of copper was carried out from the solution of the sulfuric acid leaching of copper ore Udokan Deposit containing copper 5.7 g/DM3, divalent iron 19,2 g/DM3, sulfuric acid, 6.2 g/DM3.

Solution before extraction was treated by bubbling an ozone-oxygen gas mixture concentration of 80 g/DM3ozone for 15 minutes. In the ferrous ions were oxidized to trivalent form.

Extraction was carried out in two stages by stirring for 5 minutes, treated copper-containing solution with a 20% solution LIX 986N in kerosene. The phases were separated by settling in for 2 minutes to obtain a raffinate after the second stage, containing 0.27 g/DM3copper and 19.2 g/DM3trivalent iron, and the extract containing 8,2 g/DM3copper, not iron. The raffinate after extraction was going on leaching.

Reextraction copper of the extract was carried out by single-stage stirring for 4 minutes with spent electrolyte containing sulfuric acid with the addition of fresh sulfuric acid to a concentration of 165 g/DM3. After settling separated organic extractant and reextract.

Electroextraction carried out in the electrolytic flat cathodes of stainless steel and lead anodes.

The content of copper in cathodes in the result amounted to 99.99%.

The content of copper in cathodes for extraction under the same conditions without processing copper-containing solution of hydrogen peroxide was 99.89 per cent.

Example 2.

Extraction of copper was carried out from the solution of the sulfuric acid leaching of copper sulfide concentrate Udokan Deposit, combined with the washing water containing copper and 19.4 g/DM3, divalent iron 8,4 g/DM3, sulfuric acid 4.5 g/DM3.

In the solution before extraction was added 30% hydrogen peroxide, the ferrous ions are completely oxidized the camping to the trivalent form.

Extraction was carried out in three stages by stirring for 7 minutes processed copper-containing solution with a 25% solution of extractant LIX 984N in kerosene. The phases were separated by settling in for 5 minutes to obtain a raffinate containing 1.5 g/DM3copper and 8.4 g/DM3trivalent iron, and the extract containing 12.5 g/DM3copper, not iron.

Reextraction copper of the extract was carried out in two stages by stirring for 5 minutes with spent electrolyte containing sulfuric acid, with the addition of fresh sulfuric acid to a concentration of 180 g/DM3. After settling separated organic extractant and reextract.

Electroextraction carried out in the electrolytic flat cathodes of stainless steel and lead anodes.

The content of copper in cathodes in the result amounted to 99.99%.

The content of copper in cathodes for extraction under the same conditions without processing copper-containing solution of hydrogen peroxide was 99.89 per cent.

1. The method of extracting copper from sulfuric acid solutions containing copper ions and ferrous ions, which consists in the treatment of oxidant solution containing active oxygen forms, extraction of copper in 2-3 steps of mixing the treated copper-containing solution with a solution of an organic cation-exchange extractant, section the research Institute of the mixture by settling with obtaining a copper-containing extract and the raffinate, Stripping copper in 1-2 steps from the extract by mixing the extract with a solution of sulfuric acid or spent electrolyte and separation of the mixture by settling with getting reextract and extractant solution, electroextraction of copper from reextract to produce cathode copper and spent electrolyte.

2. The method according to claim 1, wherein removing the copper lead from sulfate solutions leaching the ore or concentrate enrichment containing ferrous ions.

3. The method according to claim 1, wherein the processing sulfuric acid solution containing copper ions and ferrous iron, carried out with ozone and/or hydrogen peroxide.

4. The method according to claim 1, in which the solution used for extraction, has a pH value of 1.5÷3,0.

5. The method according to claim 1, in which the mixing time of extraction and re-extraction is 2.0÷10,0 minutes

6. The method according to claim 1, wherein a time of settling in the processes of extraction and re-extraction is 2.0÷10,0 minutes

7. The method according to claim 1, in which reextraction copper from the extract to provide a sulfuric acid concentration of 140÷200 g/l

8. The method according to claim 1, in which the extraction and reextraction carried out in a countercurrent mode.



 

Same patents:

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 relates to hydrometallurgy of rare elements and can be used for selective extraction of rhenium from sulfuric, muriatic and composite acid sulphate- chloride solutions from leaching concentrate included rhenium and secondary raw materials. This method includes selective treatment of acid liquor contained rhenium (VII) by second aliphatic alcohols at support of equilibrium concentration in raffinate 4,5-7 mole/l. At the same time the main part of rhenium (VII) turns into extract and main part of acid turns into raffinate. For selective treatment it is used secondary aliphatic alcohols with value of carbon atom C7-C10, predominately heptanol-4, octanol-2, octanol-3, nonanol-4, decanol-5, technical compound of alcohol based on octanol-2. Second aliphatic alcohol additionally can contain 0.5-1.2 mole of mineral acid. Re-extraction of rhenium (VII) is implemented by ammonia water.

EFFECT: technical result is increasing of rhenium (VII) extraction ratio at an average at 5.8%, increasing of re-extraction purity by 2.9-14.8% because of reducing co-extraction of mineral acid and also reducing of reactant consumption by 5-10% while 2 times reducing of extraction operation duration.

10 cl, 1 tbl, 8 ex

FIELD: inorganic chemistry, hydrometallurgy, chemical technology.

SUBSTANCE: invention relates to a method for separation of hafnium and zirconium. Method involves extraction step of the parent aqueous mixture containing zirconium oxychloride, hafnium oxychloride and thiocyanate salt with a thiocyanate-containing organic solvent for preparing zirconium-containing aqueous raffinate flow and hafnium-containing organic raffinate flow, separation of organic raffinate flow from aqueous raffinate flow. In the aqueous parent mixture the ratio value of total acidity to the total sum of zirconium and hafnium oxides (TA/MO2) in maintained in the range from about above 2.55 to about less 3.5. Method provides optimization process for separating zirconium from hafnium by extraction procedure.

EFFECT: improved separating method.

21 cl, 2 dwg, 1 ex

FIELD: hydraulic metallurgy, namely processes for extracting rare and rare-earth metals from natural organic raw materials such as coals and their burning products such as ash-slag waste materials.

SUBSTANCE: method is realized by using nitric acid for leaching. Selective extraction of rare-earth metal nitrates is realized due to extraction with use of organic solutions of tributyl phosphate and due to using part of heat of coal burning for regeneration of nitric acid by thermal decomposition of refined products and contained in them nitrates of potassium, aluminum, iron and other metals.

EFFECT: lowered consumption of reagents (acids) for leaching rare-earth elements from coals or ash-slag waste materials, simplified process for extracting and purifying rare-earth metals after processing leaching solutions.

4 ex

FIELD: mining industry.

SUBSTANCE: invention relates to rare-earth element recovery technology in integrated processing of mineral stock, especially to hydrogen chloride technology of eudialyte concentrate. Method according to invention comprises introduction of nitrate ion into initial chloride solution containing rare-earth and impurity elements. Chloride-nitrate solution thus obtained is treated with tributyl phosphate extractant to transfer nitrates of rare-earth elements and a part of impurity elements into first organic phase, which is then separated from chloride-nitrate solution to form first extract and first raffinate containing major part of impurity elements. First extract is washed with nitrate solution and wash solution is then returned into initial chloride solution. Rare-earth element nitrates are reextracted with water and first reextract is separated. Concentrated 35-37% hydrochloric acid is added to the first raffinate to provide 5-10% excess of the acid relative to nitrate ion content. Raffinate is treated with tributyl phosphate to transfer nitric acid into second organic phase and to form chloride solution of the major part of impurity elements. Second organic phase is separated to form extract and second raffinate, after which nitric acid is reextracted from the second extract with alkali solution to form second reextract in the form of nitrate solution, which is used to wash the first extract.

EFFECT: increased rare-earth element recovery efficiency under better environmental conditions.

5 cl, 1 dwg, 3 ex

FIELD: methods of determination of content of palladium and platinum in ores containing considerable amount of iron, copper, zinc and other metals.

SUBSTANCE: proposed method includes decomposition of ore by hydrofluoric and nitric acids followed by further decomposition by aqua regia, boiling-off to moist salts, dissolving of them in hydrochloric acid and extraction. Determination of content of palladium is carried out in organic phase thus obtained and that of platinum is carried out in hydrochloric acid phase. Extractants used for such determination are s-alkylisothiouronium halides and alcohols of C5-C8 fractions, as well as kerosene, benzene, toluene and xylols used as diluents. Used as s-alkylisothiouronium halides are chlorides, bromides and iodides from C7 to C14 and their fractions.

EFFECT: extended range of reagents and inert diluents.

2 cl, 2 ex

FIELD: hydrometallurgy; ore concentrates processing.

SUBSTANCE: the invention is pertaining to the field of hydrometallurgy, in particular, to processing of the loparite concentrate. The method includes a decomposing of the loparite concentrate at the temperatures of 103-105°C and the concentration of hydrofluoric acid of 38-42 mass % with production of the pulp containing fluorides of titanium, rare earth elements (REE), niobium, tantalum and sodium. The pulp is filtered at the temperature of 90-95°C with extraction into the fluorotitanium solution of fluorides of niobium and tantalum and no less than 58 % of sodium in terms ofNa2O and separation of the sediment containing fluorides of rare earth elements (REE) and a residual sodium. The produced solution is cooled down to 18-24°C with separation of the second sediment of sodium fluorotitanate. After that they extract niobium and a tantalum from the solution by octanol-1 extraction at a ratio of the organic and water phases as 1.1 : 1. The sediment of REE fluorides is washed from fluorotitanate by sodium water in a single phase at the temperature of 90-95°C and at the solid :liquid ratio = 1:2-2.5. The cleansing solution is separated and evaporated with extraction of the additional sediment of sodium fluorotitanate. After extraction of niobium and tantalum the fluorotitanium solution is evaporated and filtered with separation of the first sediment of sodium fluorotitanate from the concentrated solution of fluorotitanium acid, which is directed to extraction of titanium. The gained first, second and additional sediments of sodium fluorotitanate are combined and subjected to conversion with production of sodium fluorosilicate and the conversional fluorotitanium acid added to fluorotitanium solution before its evaporation. The technical result of the invention is a decrease in 2.0-2.5 times of the volume of the cleansing solutions at provision of a high degree of extraction of compounds of titanium and other target products. The produced sodium fluorotitanate contains the decreased amount of the impurity ingredients of calcium and strontium.

EFFECT: the invention ensures a decrease in two-two and a half times of the volume of the used cleansing solutions at provision of a high degree of extraction of compounds of titanium and other target products and a decreased amount of impurities of calcium and strontium in the sodium fluorotitanate.

7 cl, 1 dwg, 1 tbl, 3 ex

FIELD: metallurgy of rare and dispersed metals, chemical technology.

SUBSTANCE: invention relates to a method for extraction separation of tantalum and niobium. Method involves extraction separation of tantalum from niobium with organic solvent. As an organic solvent method involves using a mixture of methyl isobutyl ketone taken in the amount 40-80 vol.% with aliphatic (C7-C9)-alcohol taken in the amount 20-60 vol.%. At the extraction process tantalum transfers into organic phase and niobium - into aqueous phase. Then organic and aqueous phases are separated. Invention provides enhancing the extraction degree of tantalum into organic phase and to enhance the separation degree of tantalum and niobium in extraction.

EFFECT: improved separating method.

5 tbl, 5 ex

The invention relates to the processing orangutango raw materials

The invention relates to the field of hydrometallurgical processing of tantalum raw materials and are aimed at achieving its complex use

FIELD: metallurgy.

SUBSTANCE: invention concerns copper hydrometallurgy. Particularly it concerns method for copper extraction received, for instance, ore leaching by means of dense, subterranean and vat method and also from concentrates, dumps, sledges, slugs etc. Method for copper extraction from sulfuric solutions includes extraction at blending of sulfuric solutions with solution of cation-exchange organic selective extractant and further separation of mixture by means of sedimentation with receiving of copper-bearing extract and extraction raffinate. Copper re-extraction from extract is implemented by means of blending extract with solution of sulfuric acid cwith further separation with receiving of copper-bearing extract extractant solution. Then it is implemented cleaning of re-extract by flotation with further filtration or coalescing and electro extraction of copper from clean re-extract with receiving of cathode copper and spent electrolyte. Spent electrolyte is used for copper re-extraction.

EFFECT: decreasing of sulfuric acid consumption, increasing of copper extraction, decreasing of copper losses with spent solutions, improving of cathode copper.

11 cl, 2 ex

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

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: 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

Up!