Method for complex reprocessing of metal iron concentrate, containing nonferrous and precious metals
SUBSTANCE: metallic iron concentrate, containing nonferrous and precious metals is melted at the temperature 1400-1600°C with feeding of oxygen-containing wind and not containing flux silicon with forming of metal melt and wustite dross. 70-95% of iron is transferred into the wustite dross, containing less then 5-10% SiO2, and nonferrous and precious metals - into metallic melt with following divided discharge of melt products.
EFFECT: invention provides transferring of major mass of iron into the wustite dross, and nonferrous and precious metals to concentrate in metal alloy, available for further inclusion into the technology of copper-nickel manufacturing.
4 cl, 2 tbl, 1 ex
The proposed method relates to the field of metallurgy and can be used for processing of various raw materials containing metallic iron, non-ferrous and precious metals, including ores and concentrates metal iron.
Known methods of processing materials based on metallic iron containing non-ferrous and precious metals, based on the conversion of iron in the slag, and collectormania base and/or precious metals in the metal alloy.
There is a method of processing materials (scrap and residues from leaching), containing precious metals, base metals, iron, silicon, sulfur, etc. by smelting to matte and silicate slag. Stein then mixed with molten metallic iron, Nickel or copper for translation of platinum group metals, gold and partly of silver in the metallic phase (EPO application No. 0077128, MKI SW 11/02).
Methods based on obtaining silicate slag, do not allow to use the iron-containing slag as raw materials for ferrous metallurgy.
There is a method of processing materials (waste)containing metallic iron, non-ferrous and precious metals (US patent 4451289, IPC SW 1/00). Waste is loaded into a bath of molten copper, together with flux, bath blown with oxygen at a temperature of 1250-1400°C. When it is copper and/or precious metals are transferred into the bath melt and iron in the slag. Melt non-ferrous metals, containing precious metals, is supplied to the conversion.
The disadvantage of this method is the necessity of maintaining a bath of molten copper. Ferrous slag obtained in the refining process, is characterized by a high copper content and is not suitable for use as iron-containing raw materials for ferrous metallurgy. For lowering the melting temperature of slag flux is used, which can also lead to contamination of unwanted toxins for ferrous metallurgy impurities.
A method of refining of concentrates of platinum-bearing ores and secondary products of industrial production, in particular, processes BF and BOF heats (patent RU No. 2224034, IPC SW 11/02). The method includes melting a starting material in the presence of a carbonaceous reductant, followed by concentration of recoverable metals in the iron phase. According to the invention as starting material using a mixture containing not less than 2 g/t platinum group metals, as well as silicate, metal and sulfide components. Carbon reductant take in excess of for full recovery of the oxide components of the iron. Melting lead to the formation of the heterogeneous melt sulfide, silicate and metal phases. Sulfide and Seeley is atny the melt is poured, separating from the metal phase based on iron, Kollektornaya IPY. The PGM content in the metal phase, 50-60% of the mass. The metal phase is drained from the furnace, forming ingots or granulare, and subjected to oxidation treatment to oxidize the iron and full selection of platinum group metals air-blown at a temperature of 1000-1100°C or oxygen-blown at a temperature of 800-1000°C. the Process is carried out in the solid phase oxidation or in the bath melt (Converter, equipped with bottom tuyeres) to complete selection of platinum group metals in the metallic phase.
The disadvantages of the method in the context of this raw material is Novoperedelkino and high PGM content in the target metal phase, which leads to significant losses of precious metals from the slag, because, despite the high distribution coefficient of precious metals between the matte and slag, the amount of metal phase containing 50-60% PGM, ten times lower than the amount of slag.
Closest to the claimed method is integrated processing of materials based on metallic iron containing non-ferrous metals, alloy steels and alloys, Nickel-iron-cobalt alloys and Nickel-hydrogen batteries), including the melting of the processed material and the subsequent oxidation of the melt feed gazoobraznogo oxidant (A.S. No. 494414, CL SW 7/00, 02.04.1974). The oxidizer into the metal melt leads to oxidation and transfer of iron in the slag, and the remaining metal phase at this collective non-ferrous metals.
According to this method, after the melting of the processed material and set the bath in an arc or induction furnace to the surface of the melt is served quartz or soda flux or the flux mixture and the solid oxidizer. Added flux outputs of oxidized iron in a fluid slag. The iron content in the final alloy is 3-15%, this value is directly related to the content of non-ferrous metals in the slag. The reduction of iron content in the alloy to values smaller than 3 wt.% leads to an excessive decrease in the extraction of refined cobalt in the alloy. This is due to the existence of equilibrium in the distribution of iron and cobalt between the alloy and slag, and therefore required a certain minimum residual concentration of iron in the alloy, prevents increased slagging cobalt. Increased concentration of iron in the alloy (>15 wt.%) reduce the efficiency of further processing of the alloy. The obtained alloy enriched with non-ferrous metals, it is recommended to send in copper-Nickel production in the Converter, at the final stage of cooking copper-Nickel matte; cast into anodes to follow what his electrolytic refining to produce cathode Nickel; on granulation and subsequent processing of granulated alloy carbonyl-process.
The objective of the invention is to develop a technology of complex processing of metallic iron concentrates containing non-ferrous and precious metals (mainly ores containing significant amounts of metallic iron, and these components), with intermediates suitable for further processing in ferrous and nonferrous metallurgy. Technical results of the invention are the extraction of iron in the slag on the basis of vustite and preferential extraction of non-ferrous and precious metals in the metal alloy, which is suitable for further involvement in the technology of copper-Nickel production.
The technical result is achieved in that in the method of processing materials constituting the metallic iron concentrate containing non-ferrous and precious metals, including the melting of the processed material and the subsequent oxidation of the melt supply of oxygen-containing oxidizing blast, according to the invention the melting is carried out at a temperature of 1400-1600°C without feeding the silicon-containing flux to oxidation and translation in Vostochny slag 70-99,5% iron source materials.
Melting and simultaneous oxidation of the material may be maintained in autogenous mode accounts for the heat, released during the oxidation of iron.
In the melting process can optionally be entered flux containing alkali and alkaline earth metals.
It is known that oxidative melting materials based on metallic iron containing Cu, Ni, Co, Ag, Au, PGM (platinum group metals), etc., iron will oxidize in the first place, and non-ferrous and precious metals will be collectorbase in the bottom of the metal phase. This is based on several methods of removal of iron and collectormania non-ferrous and precious metals in the metallic phase. Incomplete oxidation of iron (up to 70-99,5%) without filing for melting silicon-containing flux allows you to extract the principal amount of iron in the product is suitable for ferrous metallurgy, and, on the other hand, to save some amount of iron in the metallic phase. Since the basis of the processed product is metallic iron, even at the maximum declared oxidation of iron (99,5%), the content of iron in the melt bottom phase does not drop below 40-50 wt.%. In this part of the molten metal thermodynamic activity of iron in it exceeding 0,35-0,40 and, therefore, thermodynamically complicated formation in the slag phase ferrites, including magnetite, the accumulation of which can lead to heterogenization VOSTOCHNOGO slag and stop the process. Color is haunted and noble metals thus "protected" from oxidation and transition into the slag.
The temperature of the liquidus VOSTOCHNOGO slag, not containing magnetite, will not exceed 1400°C, which is below the liquidus temperature of the metal melt (1400-1500°C depending on composition). The relative fluidity VOSTOCHNOGO slag allows you to refuse submission to the melting of the flux containing SiO2that leads to the production of ferrous slag suitable for use in ferrous metallurgy: slag on the basis of Fe-O with a strictly limited silicon dioxide content (not more than 5-10 wt.%). Bustany slag will be sufficient for normal progress fluidity at temperatures above 1400°C. To adjust the fluidity VOSTOCHNOGO slag may use small quantities of CA-containing flux to produce ferrailleur slag. Increasing the process temperature above 1600°C is impractical due to the aggressiveness of the slag melt.
Even if the feedstock contains some sulphur (up to 1-5 wt.%), the sulfur content in wustite the slag does not exceed 0.1 wt.%, as the main part of the sulphur will be redistributed during oxidative melting between the bottom phase and the exhaust gases of the process. Negligible sulfur content in wustite slag valid for the source of raw materials for ferrous metallurgy.
Oxidative fusion of the processed material provides with the content of copper in the slag is less than 0.2-0.3 wt.%. Therefore, bustany slag is conditioned on the content of the copper raw material of ferrous metallurgy.
Since the oxidation of iron is accompanied by a significant release of heat, the melting process is implemented in autogenous mode: burning fossil fuels needed to heat the aggregate and material when the process starts.
The process is carried out at autogenous furnace feed on the surface of the slag molten metallic iron concentrate. Oven cheshireman, in the operation of the caissons protected from the effects of slag and metal melts the crust. The heat required for melting the material and functioning of the unit, is allocated as a result of oxidation of iron concentrate oxygen blast (air or oxygen-enriched air)supplied through submerged in the slag melt or not submerged lance (lance). The process is conducted at a ratio of feed concentrate and blast that provide oxidation and transfer in the slag phase is the main part of iron (70-99%) concentrate. As the bottom metal phase contains more than 30-40 wt.% iron, the formation of magnetite in the slag bath is minimized. The slag on the basis of FeO retains a high fluidity at temperatures above 1400°C.
The combination of the claimed methods and parameters of oxidative acetylene PLA the key concentrate of metallic iron allows you to receive molten metal phase, enriched colored and precious metals, as well as the slag melt with minimal sulfur content, non-ferrous and precious metals and containing more than 60% Fe and less than 5 wt.% SiO2.
The method is illustrated by an example.
The proposed method for the processing of metallic iron concentrate was tested in laboratory conditions.
The source material is metallic iron concentrate obtained magnetic separation of ore Galtelli intrusion Kureika district of Krasnoyarsk region. The content of the main components in the concentrate of metallic iron ( wt.%, g/t):
|Fe ocil. + Fe silicate||Cu ocil.||SiO2||TiO2||Al2O3||Cr2O3||MgO||MnO||CaO||V2O5|
In Lundby crucible volume of 100 ml was loaded suspension concentrate of metallic iron with a mass of 50 grams. The crucible with the material was placed in an induction furnace and heated to a temperature of 1550°C using the indirect heating of the graphite tube. Complete melting of the material was observed at a temperature of 1500°C.
After melting of the material to the surface of the melt were summed blast (air or gaseous oxygen brand CHP). As lance was used Alentova tube with a channel diameter of 2 mm, the Amount of blast - 0.5 l/min oxygen Uptake blast as by blowing air or by blowing gaseous oxygen was 90-95%.
Significant heat due to the exothermic effect of the reaction of oxidation of metallic iron, it was necessary to reduce the load applied to the inductor furnace to ensure the process temperature at the level of 1550°C.
After the desired purge time (weight 50 g, blowing O2≈100% 0.5 l/min, the absorption 95% ((50*0,9)* 15,9994/55,847)*22,4/31,9988)/0,5/0,95=19,0 min) the crucible with the melt is removed from the furnace and cooled in air. The slag is separated from the metal bottom phase. Samples of slag and metal were analyzed by chemical methods.
The content of the main components of the produced slag and metal (wt.%, g/t)and the distribution of the main components of the concentrate between the slag and metal are presented in table 2
As can be seen from the presented data, it was also investigated the composition of the metal, resulting from the smelting of the concentrate without conducting oxidative blowing.
When carrying out oxidative blowing molten slag foaming, which could indicate the formation of magnetite in the complete or almost complete oxidation of iron metal phase was not observed.
Studies have confirmed theoretical background for the practical implementation of the method pyrometallurgical processing of metallic iron concentrate containing non-ferrous and precious metals, with a melt of the metal phase, enriched colored and precious metals, as well as the slag melt with minimal sulfur content, non-ferrous and precious metals and containing more than 60% Fe and less than 5 wt.% SiO2.
Thus, the proposed method allows to process materials based on metallic iron containing non-ferrous and precious metals, with the receipt of slag on the basis of FeO, which is conditioned raw black metal and can be recycled to the extraction of iron and metal alloy based on iron containing color and b Gorodnya metals, which can be recycled together with copper-Nickel matte or sent to hydrometallurgically the redistribution of copper and Nickel production. When this is achieved the extraction of iron in Vostochny slag 70-99,5%, non-ferrous and precious metals in the metal alloy is 50-99%.
|Material||Mass, gr.||Content, % mass||Content, g/t|
|The metal to oxidation purge||46,0||1,05||0,52||0,42||n/a||0,31||97,5||0,2||5,0||15,5||2,0||0.1||0.5||0.03|
|Removing the metal, %Rel.||69,2||45,1||51,2||3,2||3,6||98,5||96,4||of 76.8|
|*estimated value : |
n/a - not diagnosed used method of analysis
n/a - not analyzed
1. A method of processing metallic iron concentrate containing non-ferrous and precious metals, including its loading and melting when applying oxygen-containing blast with the formation of molten metal and VOSTOCHNOGO slag, in which the melting is carried out at a temperature of 1400-1600°C With feed containing silicon flux and translation 70-95% of iron in Vostochny slag containing less than 5-10% of SiO2and non - ferrous and precious metals in the metal melt with subsequent separate product melting.
2. The method according to claim 1, in which during the melting process serves flux containing alkali and alkaline earth metals.
3. The method according to claim 1 or 2, in which the process is conducted at autogenous mode.
4. JV the property according to claim 1 ili, in which the metallic iron concentrate load on the surface VOSTOCHNOGO slag melt.
SUBSTANCE: furnace contains cylindrical body with constant inner diametre, burner for furnace heating and shutter for compact closing of open side. Furnace body is installed on the frame, merely supported on foundation elements, at that furnace body is implemented with ability of deviation or inclination for different angles. As internal walls of furnace body allows constant diametre, it is not obligatory more to incline furnace per too big angle for teeming of molten metal, as narrow spot absence, which before operating as threshold. Air for burning is directed to burner through supply ducts into burner of fuel and air for burning, formed by damper loops or installed in those loops. Supplying system of air/fuel contains gastight revolving and knee joints, fixed to furnace and inclines and moved with furnace. Intelligence system processing parameters and regulates furnace operating.
EFFECT: invention removes problems, related to existing furnaces, increasing of metal extraction degree from wastes.
34 cl, 7 dwg, 1 tbl
SUBSTANCE: invention relates to the method of lead utilisation. Method of lead utilisation from waste accumulators includes location of undisturved lead plates with active mass of waste accumulator in electrolyte. Then it is implemented simultaneous dissolving of undisturved lead plates with active mass in electrolyte and lead electrochemical isolation. Additionally lead isolation is implemented at current density 5-15 mA/cm2. In the capacity of electrolyte it is used maleic acid.
EFFECT: providing of almost total lead utilisation from waste lead accumulators.
1 dwg, 1 tbl, 3 ex
SUBSTANCE: invention relates to ferrous metallurgy field, particularly, it relates to processing of disintegrating slag. Processing of disintegrating slag includes preliminary and final cooling, screening, dedusting and magnetic separation of decay daughter. Preliminary cooling and screening of disintegrating slag is implemented on screening grating with cells sizes from 80×80 mm till 300×300 mm with vibration action of frequency 3000-6000 vibration per minute with driving force from 2.5 till 9.0 kN. Final cooling and dedusting are implemented simultaneously in revolve drum with linear velocity of the internal surface of shell ring 0.2-0.5 m/s and rate of airflow in cavity of drum 0.6-4.0 m/s. Additionally powdered and dust-free decay products of slug is subject to magnetic separation separately.
EFFECT: reduction of cooling duration and slag disintegration, reduction of metal loss with lump and powdered slag, increasing of amount of metal production and products from slag mineral constituents.
2 cl, 1 dwg, 3 tbl
SUBSTANCE: invention relates to installation for melting of the primary and secondary aluminium with screening and collecting of slag. Facility contains rotary kiln for aluminium melting excluding usage of salt bath, inside of which there are helical element, bleed channel implemented with required inclination located in isolated chamber, allowing window between hole of rotary kiln and spherical accumulator tank located lower in blind area and outfitted by rotary joint for providing of the constant inclination of bleed channel and ability of direct and continuous pouring with metal melt into reservoir, device for automatically continuous screening and collection of melting slag, built into the facility and double system of channels for withdrawing of effluent gases.
EFFECT: provision of qualitative removing of pollutants, essential saving of energy in melting furnace, cost saving for waste treatment and maintenance and replacement of worn spots.
23 cl, 6 dwg
SUBSTANCE: invention relates to non-ferrous metallurgy field, particularly it relates to manufacturing of briquettes from secondary raw materials, particularly from secondary aluminium. Briquettes from secondary aluminium is received by pressing of mixture from grinned aluminium with admixture. In the capacity of aluminium it contains aluminium scrap with fraction size from more than 3 till 10 mm. In the capacity of addition it is included slag-forming component quicklime CaO in amount from more than 10 till 30% from the common mass of mixture, at that mass of received briquette is 15-2000 g. For receiving of AB-91 in the capacity of aluminium scrap briquette contains alimentary aluminium tin as the basis and no more than 10% of foil, for receiving of AB-87 in the capacity of aluminium scrap it contains alimentary aluminium tin as the basis no more than 10% of foil and no more than 10% of aluminium alloys chips, with briquette is implemented in the form of cylinder of diametre 10-15 mm and height from 15 till 200 mm.
EFFECT: increasing of cost-effectiveness of briquettes from the secondary raw materials.
SUBSTANCE: brick includes iron-containing and zinc-containing materials, reducer and binder. In the capacity of iron-containing material it is used ferrous materials scale, zinc-containing material - dust electric furnace steelmaking, in the capacity of reducer - screening of breeze coke, and in the capacity of binder ladle slag of electric furnace steelmaking. Ratio of components in brick is following, wt %: gas cleaning dust of electric furnace steelmaking 30-70; ferrous materials scale 1-25; screening of breeze coke 1-15; ladle slag of electric furnace steelmaking 5-45. Invention will provide receiving of semiproduct for zinc industry in the form of collected dust with zinc content no less than 32%.
EFFECT: effective materials recovery.
SUBSTANCE: invention refers to method of phosphorus recovery from aqueous slurry to be divided into aqueous suspension containing suspended phosphorus particles and impurities, and coarse solid particles. Adding flocculant to the suspension enables to agglomerate suspended phosphorus particles and impurities removed from water and heated up to melt element phosphorus. Coalescing agent is added to coalesce melted element phosphorus separated from impurity particles. Coarse solid particles are mixed with hot water to melt phosphoric sludge thereafter separated from inert solid particles. Solid particles are heated up to burn any residual element phosphorus. Separated melted phosphoric sludge is mixed with chromic acid solution to recover phosphorus as a separate phase. Reducing agent is added to residual water and solid particles thus reducing Cr+6 in Cr+3. At last, alkali is added to water and solid particles to ensure reaction with residual phosphorus and produce phosphorus compounds. Reaction mass is filtered. Filter cake is to be buried as a safe waste.
EFFECT: transformation of residual processing sludge into safe waste.
9 cl, 1 dwg, 1 ex
FIELD: sewage treatment facilities.
SUBSTANCE: invention may be used in production of fluoroberyllate ammonia - initial product for production of beryllium and its compounds. Method for processing of beryllium metal wastes includes operations of flushing from foreign admixtures, chopping to size of 2-5 mm and dilution in solution of ammonia bifluoride during heating. Process of beryllium metal wastes dilution is done in presence of oxidant - nitric acid or ammonia nitrate taken in amount of 0.4-0.8 mole per mole of metal powder, at the temperature of 85-90°C. Ammonia bifluoride is taken in amount of 180-200% from stoichiometry.
EFFECT: invention makes it possible to reduce release of fire-and-explosive hazardous gaseous hydrogen and to prevent possible exhaust of highly toxic fluoride-beryllium pulp from reactor.
1 tbl, 1 ex
SUBSTANCE: invention refers to method of mercury removal from mercury-contaminated polluted alkali or alkali alcoholate spirit. Mercury-contaminated alkali or alkali alcoholate spirit is filtered through coal at first and then through inert fibrous material. Filtration is followed with introducing distillation column into solution over the bottom. Water or spirit are reduced, while mercury-depleted alkali or spirit are delivered to the column bottom.
EFFECT: lower mercury content in solutions to maximum value 3 fractions to billion.
4 cl, 3 tbl, 3 ex
FIELD: technological processes; metallurgy.
SUBSTANCE: invention is related to ferrous and non-ferrous metallurgy, namely to recycling of slags and ash-and-slag wastes. Method for slags recycling for extraction of valuable components includes magnetic separation and gravitational enrichment with production of concentrate and rewash discard. Rewash discard after enrichment are exposed to cavitation processing and biohydrometallurgical redistribution, which provides for additional extraction of valuable components available in slag matrix. Recycling is carried out by means of bacteria growing to concentration of 103-105 cells per 1 ml, addition of rewash discard to solution with bacteria in the ratio of T:Zh=1:5 and development of bacteria cultures to concentration of 107 cells per 1 ml. In process of recycling permanent aeration is carried out at medium temperature of 15-32°C. Valuable components are extracted from produced solution.
EFFECT: higher efficiency of slag and ash-and-slag wastes recycling.
SUBSTANCE: invention relates to hydrometallurgy, particularly it relates to method of joint separation of platinum metal (PM). Method includes several stages: first stage is implemented for leaching of initial material, containing PM and impurity element. The second stage is implemented for removing of impurity elements from alkaline solution from leaching by solvent extraction, the third stage - for removing of palladium from raffinate. The fourth stage is implemented for removing from raffinate of impurity element cations by extraction by dissolvent. The fifth stage is implemented for extraction from the raffinate of platinum by hydrolysis, the sixth stage - for extraction from ruthenium settling by leaching and the seventh stage - for extraction of iridium by solvent extraction with receiving of desorbed alkaline solution, containing iridium, and raffinate containing rhodium.
EFFECT: effective removing of impurity elements, with each of separated PM allows grade enough for that it could serve in the capacity of commercial product.
18 cl, 14 tbl, 1 ex, 3 dwg
SUBSTANCE: invention relates to hydrometallurgy. Particularly it relates to method of extraction of nonferrous (Cu, Zn, Co, Ni and others), rare (U, rare earths, Y, Re, Ti, In and others) and precious (Au, Ag, Pt, Pd and others) metals from ores and materials. Method includes leaching of ores in two stages. At the first stage ore and materials treatment is implemented by the first spillage leaching solution with introduction of sulfuric acid and salts of ferric iron in amount, providing in the end of leaching in productive solution molar ratio ion concentration of ferric and ferrous iron no lower than 1:1. At the second stage ore and materials treatment is implemented by the second spillage leaching solution with introduction of sulfuric acid, thiocyanate salts and ferric iron in amount, providing in productive solution molar ratio of ion concentration of thiocyanate and ferric iron no higher than 2:1 and no lower 0.5:1, and ratio of concentration ferric and ferrous iron ions are also no lower than 1:1. Then it is implemented separate processing productive solutions of each stage by means of chemical deposition, sorption and/or electrolysis and spillage solutions return for corresponding stage.
EFFECT: increasing of extraction ratio of nonferrous, rare and precious metals.
5 cl, 5 tbl, 11 ex
SUBSTANCE: invention is related to noble metals metallurgy and can be used for technology of desilverisation and gold extraction from zinc-bearing golden-silver cyanic sediments with increased content of silver. Initial zinc-bearing golden-silver cyanic sediment is leached, at first, in nitric acid solution and then into received pulp excluding filtration it is added caustic soda solution till achieving the concentration NaOH, equal to 100-140 g/l. After it alkaline solution is separated from non-solved sediment. The latter is washed by alkaline solution, dried, molten with fluxes on golden-silver alloy. Received alloy is settled, slag is separated from silver gold-bearing alloy, which is directed to silver refining by means of electrolysis in nitro-acid electrolyte. Electrolysis products are refined cathodic silver and golden sludge, which is refined by well-known methods.
EFFECT: removing of detrimental impurities, essentially, zinc, selenium and tellurium made of initial cyanic sediment.
SUBSTANCE: invention refers to methods of gold and silver recovery from sulphide concentrates and industrial deposited concentrates. Method involves leaching gold-bearing and argentiferous concentrates with acid thiocarbamide liquors with the oxidiser added and extraction recovering noble metals from leaches. Extraction is preceded with adding thiocyanate ions to leaches in amount to ensure complete transferring thiocyanate gold and silver complexes into the organic phase. Extractant is mixed tributyl phosphate (TBP) and diphenylthiocarbamide (DPTC) in kerosene, containing TBP 1.5-2.0 mole/l and DPTC 0.015-0.022 mole/l. Gold and silver are re-extracted from the organic phase with the reducing agents precipitating noble metals within reduction process.
EFFECT: lower thiocarbamide loss at the stage of noble metal extraction from the leach.
9 cl, 1 tbl, 25 ex
SUBSTANCE: invention relates to method of metals heap leaching, notably, gold from ore. Method includes ore reduction, ore division into fractions, ore dump by uniform in fractions inclined layers with reduction of ore fineness from the low layer to top with separation of layers by perforated polymer film. Then it is implemented stack irrigation by leaching cyanide solution with concentration 0.2-0.8 g/l. Additionally after dump of each ore leaching it is implemented treatment of layer by cyanide solution with strengthen concentration and its standing. Concentration of cyanide solution and standing duration are reduced from low later to top from 2.0-4.0 g/l till 1.0-1.5 g/t and from 5-6 days till 2-3 days correspondingly.
EFFECT: leaching effectiveness increase.
FIELD: technological processes; metallurgy.
SUBSTANCE: method for cuvette-heap leaching of metals is related to hydraulic metallurgy and may be used in leaching of non-ferrous, rare and precious metals ores. Method includes treatment of mineral mass with solution of leaching agent and metal extraction. Treatment of mineral mass with solution of leaching agent and metal extraction is carried out in two stages. Previously mineral mass is placed in cuvettes with hydraulically insulated walls and bottom. Then solution of initial reagent is introduced, and local portion activation of produced pulp is carried out with provision of secondary reagents. After activation pulp is exposed to fractioning with extraction of sludge-clay and sand fractions. Sand fraction is dehydrated. Productive solution and sludge-clay fraction produced as a result are exposed to sorption or electric sorption leaching. Stacks are formed from sand fraction, and material is exposed to heap leaching. Liquid phase that remained after leaching of sand and sludge-clay fraction is additionally strengthened and sent for heap leaching.
EFFECT: higher efficiency of process.
2 cl, 1 ex
SUBSTANCE: it is implemented treatment of copper-nickel sulfide concentrate by fluoride and/or ammonium bifluoride at the temperature 165-210°C during 2-3 hours with forming of hard fluorination products and emission of ammonia gas and water vapor. Fluoride and/or ammonium bifluoride are used in amount 1.0-1.2 from stoichiometric with respect to overall content in copper-nickel concentrate of silicates and pyrrhotine. Hard fluorination products exposed to water leaching at the temperature 40-60°C and S:L=1:5-6 during 1-2 hours with transformation to residue nickel sulfide, copper, cobalt, platinum metal and magnetite, and into solution - fluorine-ammonium silicon saline, magnesium, iron, aluminium and calcium. Residue is separated from solution and exposed to magnetic separation with magnetite extraction. Received solution is neutralised by ammonia water till providing of pH 8-10 with regeneration of fluoride and/or ammonium bifluoride and receiving of residue of magnesium, iron, aluminium, calcium and silica hydroxides. In the capacity of ammonia water for solution neutralisation can be used ammonia gas and water vapors from the stage of raw materials fluorination. Formed ammonium fluoride and/or bifluoride are returned to raw materials treatment stage.
EFFECT: energy content reduction and providing of selectivity sulfide crude ore treatment at less number of operations.
5 cl, 1 dwg, 4 ex
SUBSTANCE: invention concerns treatment of hard gold-arsenic ores. Particularly it concerns antimonous sulphide ores and concentrates. Method includes without oxidising melting in smelting chamber with receiving of matte and slag melts and treatment of melting products by metallic phase. At that without oxidising melting is implemented continuously in circulating melted slag with out of melting products into settling chamber to interphase boundary slag - matte. Before melting circulating melted slag is separated from operating gases. For circulating it is used maximum separated from matte slag. Treatment of matte by metallic phase is implemented in continuous operation. Furnace for processing of hard gold -arsenic ores and concentrates includes smelting chamber. Furthermore, it is outfitted by recycling contour, containing of gas-lift unit with tuyeres and descending and ascending channels of melted slag, gas separating and settling chambers. Gas separating chamber is communicated with smelting chamber through bleed blowhole by means of channel for separation of working gas of gas-lift unit and gas separating chamber from circulating melted slag. Smelting chamber immersed into settling chamber to interphase boundary slag - matte. Settling chamber contains gas flue for withdrawal of sublimates and low blowing melting products.
EFFECT: increasing of noble metals extraction into matte.
8 cl, 3 dwg
SUBSTANCE: invention refers to hydrometallurgy, particularly to facility for extraction of precious metals, notably, gold and silver out of tails and other materials with high contents of fine fractions. The facility consists of a solution proof base and a border and also of a drainage system. The drainage system is made in form of a perforated tube with a gate at a discharge end. On the solution proof base there are successively laid: a layer of crushed stone of 2-5 mm size and of 150-200 mm thickness, then a layer of crushed stone of 5-40 mm size and 300-600 mm thickness, in the central part of which the perforated tube is located, then there is a layer of fabric out of geotextiles and a layer of crushed stone of 2-5 mm size and of 200-300 mm thickness; also the solution proof base is made with counter incline of 3-5° from each side from two counter borders into the direction of the perforated tube and also with the incline to horizon of 2-4° into the direction of the discharge end of the perforated tube in a vertical plane passing through the central longitudinal axis of the perforated tube.
EFFECT: facilitating extraction of precious metals out of materials with high contents of fine fractions and also simplification and reduction in cost of facility and its operation.
FIELD: metallurgy of iron.
SUBSTANCE: method comprises steps of mixing iron-containing components with carbon-containing reagents being technical carbon produced at process of thermal-oxidation decomposition or thermal decomposition of hydrocarbons; providing reaction of iron containing components heated and soaked in furnace with carbon-containing reagent for depositing finely dispersed carbon on surface and also in macro- and micro-pores of iron-containing component volume; creating in furnace protection atmosphere due to feeding nitrogen into furnace; cooling produced sooty iron in furnace. Invention allows shorten time period of production of sooty iron and increase by 2.9 - 4.5 times efficiency of said process.
EFFECT: improved efficiency of method, shortened duration of process for producing sooty iron.