Extraction of basic metals from sulfide ores and concentrates

FIELD: chemistry.

SUBSTANCE: process comprises the steps of mixing the ore-containing base metal with the ferric salts. Base metals are preferably copper, nickel and zinc. The mixture is then heated, water is added to form a slurry, mixed and the slurry is filtered.

EFFECT: increasing the efficiency of extraction of the specified metals at processing of ores and concentrates with the low maintenance of sulfides.

10 cl, 3 tbl, 3 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: wastes are mixed with saltpetre and soda in ratio 1:(1-1.25):(1-1.25), theoretically required for oxidation reaction. After that, heating is performed first to 200-300C, with further, after an hour, heating to temperature 460-500C. Cake is cooled, crushed and leached in water at temperature 20-30C, arsenous solution is separated, and gallium cake is leached in 13-19% alkali solution at temperature 60-80C. Filtered from insoluble residue solution is cooled to 15C and admixture of sodium phosphate is filtered; gallium solution is supplied to electrolysis.

EFFECT: elimination of harmful emissions, reduction of gallium oxide sublimation and reduction of gallium output into circulating industrial product.

1 tbl, 1 ex

FIELD: mining.

SUBSTANCE: invention relates to a method of leaching of valuable minerals from a permeable ore body or from the solid particles obtained from the ore containing components of metal carbonates and sulphides. The method comprises initial leaching of carbonates by water leachant containing the acid selected for dissolution of carbonates, but not sulphides, at controlling of level of leaching for avoidance of CO2 gas release in an ore body. Then sulphides are leached by a water leachant containing a salt of multivalent metal capable to oxidation of sulphides in soluble oxidation products. Then extraction of the required valuable metals from separate products of leaching is performed.

EFFECT: exception of blocking in the depths of the flow channel preventing leaching of all required valuable metals.

13 cl

FIELD: chemistry.

SUBSTANCE: invention relates to rare and radioactive element technologies and can be used to obtain concentrates of rare and rare-earth elements from monazite. The method of processing monazite concentrate includes treating the feed stock with a mixture of sulphuric acid and ammonium fluoride at 200-230C for 30-40 min, purifying the obtained product from phosphate and fluoride products by sublimation, water leaching sulphates of rare-earth elements, neutralising the solution with barium chloride, selectively separating the thorium, uranium, iron and rare-earth product, wherein separation of the rare-earth product is carried out through a step of precipitating double salts of rare-earth elements with ammonium sulphate, followed by conversion into nitrates of rare-earth elements through a calcination step, dissolving in nitric acid and solvent refining from thorium impurities.

EFFECT: invention provides high degree of extraction and purity of the rare-earth product.

3 cl, 2 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to technology of obtaining zinc oxide and can be applied for obtaining zinc oxide with displaced isotopic composition. Method includes obtaining zinc hydroxide from diethylzinc, which is carried out in flow-type reactor in water or water pulp stream, containing zinc hydroxide, with consumption of diethylzinc up to 40 kg and hour with obtaining pulp, which contains zinc particles. Pulp is subjected to separation to separate it from reaction gases and re-supplied into reactor as hydrolysing agent. After pulp saturation zinc hydroxide is separated from water by settling. Zinc hydroxide is dried and decomposed to zinc oxide.

EFFECT: process safety which is achieved due to instant removal of heat and reaction products by water stream.

3 ex

FIELD: mining.

SUBSTANCE: invention relates to a processing method of Domanic formations. The method involves agitation neutralisation - decarbonation by treatment with pulp of crushed ore or by a neutraliser of a hardened solution cleaned from aluminium so that a productive solution and decarbonated cake is obtained. Then, a clay product is leached from decarbonated cake in the form of nepheline with the hardened solution so that pulp sulphate is obtained. After that, autoclave oxidation leaching of uranium, vanadium, molybdenum and rare-earth metals is performed from a solid phase of pulp sulphate in presence of substances that oxidise vanadium selectively so that a hardened solution, which contains aluminium, vanadium, uranium, molybdenum and rare-earth metals, and insoluble residue is obtained. Gold and platinum is extracted from the insoluble residue. Potassium aluminium sulphate alum is extracted from the hardened solution. Uranium and molybdenum and vanadium and rare-earth metals are extracted from the productive solution.

EFFECT: extraction of aluminium, uranium, vanadium more than 90%, reduction of emissions to atmosphere due to complex use of residues of Domanic formations.

16 cl, 1 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: method involves stage-by-stage deposition of sulphides of non-ferrous metals from a solution of oxidised pulp by metallic iron and a polysulphide-thiosulphate reagent at the temperature below the melting point of elemental sulphur and by continuous mixing with the next release of sulphides and elemental sulphur by floatation to a bulk sulphur sulphide concentrate. With that, deposition of sulphides of non-ferrous metals is performed in presence of an organic additive having an ability for selective heterocoagulation of sulphides and elemental sulphur, at weight ratio of the sulphur introduced with the polysulphide-thiosulphate reagent to the organic additive which is equal to 1:(0.0015-0.020). After the deposition stage of sulphides with the polysulphide-thiosulphate reagent, metallic iron is additionally added to the pulp.

EFFECT: reduction of iron consumption at simultaneous preservation of quality of a sulphur-sulphide concentrate and improvement of an extraction level to it of non-ferrous and precious metals.

5 cl, 1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to recycling active material of a nickel oxide electrode of a nickel-cadmium accumulator. The method includes dissolving the active mass in 1M ammonium chloride solution. The solution then undergoes electrolysis with a titanium vibration cathode and a graphite anode in rectangular pulsed current mode with amplitude of 0.3-0.5 A/cm2, pulse duration of 0.05-0.15 s and pause duration of 0.05-0.1 s. Before electrolysis, the solution is held in a flow mixer for 10-12 hours. The method enables to obtain nickel powder with particle size in the range of 4-6 mcm.

EFFECT: high output of the product and efficiency of the process, obtaining ultrafine electrolytic nickel powder, high cost-effectiveness and environmental safety of the process.

2 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: method includes application of active soda solution, subjected to electrochemical and/or photoelectrochemical processing, and leaching by supply of leaching solution, containing complexants for gold, for its extraction. Hydrogen peroxide is introduced into soda solution after electrochemical processing with obtaining active carbonate-peroxide solution. After that obtained active carbonate-peroxide solution is supplied into gold-containing mineral mass, carbonate-peroxide solution being supplied cyclically, alternating with cycles of supply of leaching solution, until acceptable level of gold extraction is achieved.

EFFECT: increase of process efficiency due to formation of mineral mass of raw material more permeable for leaching solution.

2 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: initial raw material is crushed to fraction 0.25-0.5 mm, mixed with water in equal ratio, loaded into working reservoir of autoclave installation to 2/3 of its volume, sealed with locking membrane and heated to temperature, value of which corresponds to maximal pressure on thermobarogram, obtained for said raw material by method of vacuum decriptometry. After termination of leaching process, locking membrane is opened, with solid-gas-liquid flow from closed high-pressure volume being emitted into reaction chamber vacuum, reflected from its cylindrical wall, creating reverse explosion wave, which results in intensive fluid-thermal dissolution of said type of raw material.

EFFECT: increased output of valuable elements-admixtures from mineral raw material due to increased intensity of the process of metal compound destruction in processing of raw material with different degree of metamorphism.

4 cl, 7 dwg, 4 tbl

FIELD: chemistry.

SUBSTANCE: method of immobilising mercury in solid wastes, containing mercury oxide and metal mercury, includes oxidation of metal mercury with water hydrogen peroxide solution and precipitation of mercury in form of basic bivalent mercury carbonate (HgCO32HgO). Precipitation of mercury simultaneously with oxidation or after oxidation is carried out by processing wastes with carbon dioxide in autoclave under pressure 15-20 atm at temperature 40-50C for 4-5 hours.

EFFECT: reduction of consumption of reagents and elimination of formation of secondary wastes.

3 cl, 3 tbl, 3 ex

FIELD: metallurgy.

SUBSTANCE: method of heap leaching of silicate nickel ores includes ore crushing, ore mix preparation with fluoride adding from the group: sodium silicofluoride, fluoric calcium, ammonium fluoride and/or ammonium hydrofluoride amounting 1.3-1.7 wt % (in terms of fluorine). Then the mix is balled by pelletizing using the concentrated sulphuric acid in the ratio S : L = (88.0-94.0): (6.0-12.0) as a binder. After pelletizing the pellets are laid in a heap and leached by sulphuric acid solution.

EFFECT: shortening time of leaching at high level of extraction of nickel, cobalt and magnesium, decrease of power and material inputs.

4 cl, 1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to the recovery of secondary metal scraps, in particular, to processing of metal scraps of nickel-based rhenium containing heat-resisting alloys. Under method the electro-chemical dissolution of the heat-resisting alloy is performed upon anode polarization by pulse current at constant parameters (current) in nitric electrolyte with further nickel and rhenium extraction at monitored cathode potential. The inert electrode is used as cathode. The soluble alloy is used as anode. Dissolution of the nickel-based rhenium containing heat-resisting alloy is performed at fixed current density, and further extraction of nickel and rhenium is performed at monitored cathode potential.

EFFECT: processing of the nickel-based rhenium containing heat-resisting alloys with production of nickel and rhenium powders with different composition of components.

5 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy of non-ferrous metals, namely to production of cobaltous oxide Co3O4 for hard alloys of WC-Co type manufacturing. The cobaltous oxide is deposited from nitric solution of cobalt containing feed stock by treatment in autoclave by ammonium hydroxide (NH4OH) at 240-260C for 1-2 h.

EFFECT: assurance of deposition containing 98% of cobaltous oxide.

2 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: method involves stage-by-stage deposition of sulphides of non-ferrous metals from a solution of oxidised pulp by metallic iron and a polysulphide-thiosulphate reagent at the temperature below the melting point of elemental sulphur and by continuous mixing with the next release of sulphides and elemental sulphur by floatation to a bulk sulphur sulphide concentrate. With that, deposition of sulphides of non-ferrous metals is performed in presence of an organic additive having an ability for selective heterocoagulation of sulphides and elemental sulphur, at weight ratio of the sulphur introduced with the polysulphide-thiosulphate reagent to the organic additive which is equal to 1:(0.0015-0.020). After the deposition stage of sulphides with the polysulphide-thiosulphate reagent, metallic iron is additionally added to the pulp.

EFFECT: reduction of iron consumption at simultaneous preservation of quality of a sulphur-sulphide concentrate and improvement of an extraction level to it of non-ferrous and precious metals.

5 cl, 1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to recycling active material of a nickel oxide electrode of a nickel-cadmium accumulator. The method includes dissolving the active mass in 1M ammonium chloride solution. The solution then undergoes electrolysis with a titanium vibration cathode and a graphite anode in rectangular pulsed current mode with amplitude of 0.3-0.5 A/cm2, pulse duration of 0.05-0.15 s and pause duration of 0.05-0.1 s. Before electrolysis, the solution is held in a flow mixer for 10-12 hours. The method enables to obtain nickel powder with particle size in the range of 4-6 mcm.

EFFECT: high output of the product and efficiency of the process, obtaining ultrafine electrolytic nickel powder, high cost-effectiveness and environmental safety of the process.

2 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to the recovery of secondary metal scraps, in particular, to processing of metal scraps of nickel-based heat-resisting alloys (superalloys). Method of recovering nickel from nickel-based heat-resisting alloys by electrochemical processing involves anodic dissolution of the alloy at anodic polarisation by pulse current at constant potential in nitric acid electrolyte. The anodic dissolution is carried out at nitric acid concentration of 100 g/L at fixed value of the anode potential equal to 1.0-1.2 V. As a result the cathode product - nickel concentrate with the purity of at least 95% per one stage - is obtained.

EFFECT: processing of nickel-based heat-resisting alloys producing nickel concentrate of high purity.

3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of flotation dressing of sulphide copper-nickel ores, containing metals of platinum group, and can be used in collective flotation of sulphides from disseminated copper-nickel ores. Method includes crushing and conditioning of ore in presence of sulphhydryl collector -butyl potassium xanthate, introduction of foaming agent into flotation stage and isolation of nickel and copper sulphides into foam products, with waste rock minerals being separated into final tailings. Reagent B-56, representing polystyrylphosphinoxide of formula (C25H30O5P2)k, is introduced as foaming agent, with consumption 20 g/t.

EFFECT: increase of technological parameters of flotation process, extension of assortment of effective flotoreagents - foaming agents.

1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: proposed process comprises definition of nickel content in laterite nickel ore. Then, said ore is processed to nickel-bearing precursor proceeding from nickel content definition to produce fused ferrochromium from chromite ore. Then, nickel-bearing precursor is fed while fused ferrochromium is loaded into converter to get fused stainless steel. Then, produced stainless austenite steel is fed to continuous casting machine to get steel slab.

EFFECT: higher efficiency of this process.

18 cl

FIELD: chemistry.

SUBSTANCE: invention relates to removal of manganese from nickel chloride solutions used in nickel electrolysis. Content of the chloride ion in the nickel chloride solution is increased to 8.2-9.0 M by adding nickel chloride with concentration of 190-210 g/l nickel or hydrochloric acid with concentration of 9-11 M HCl. The nickel solution is then treated with an extraction mixture containing 33-41% trioctylamine in chloride or sulphate form, 35-60% 2-octanone and an inert diluent - Exide-100 or Shellsol D-40. Extraction treatment is carried out in 1-2 steps for 2-3 minutes with extraction of manganese (II) into an organic phase and obtaining a pure nickel chloride solution.

EFFECT: purifying nickel chloride solution to residual manganese (II) concentration of 5-8 mg/l while reducing the number of extraction steps and duration of the process.

6 cl, 7 ex

FIELD: metallurgy.

SUBSTANCE: proposed method comprises mixing of initial stock with alkaline metal chlorides (NaCl, KCl) and low-temperature annealing at 350-400C for 1.5-2 hours. After annealing, cinder is leached by water with transition of water-soluble copper and cobalt compounds in solution. Annealing makes not only copper and nickel but cobalt as well change into water-soluble sulphates and chlorides.

EFFECT: simplified, non-polluting process.

2 cl, 4 ex

FIELD: mining.

SUBSTANCE: invention relates to a method of leaching of valuable minerals from a permeable ore body or from the solid particles obtained from the ore containing components of metal carbonates and sulphides. The method comprises initial leaching of carbonates by water leachant containing the acid selected for dissolution of carbonates, but not sulphides, at controlling of level of leaching for avoidance of CO2 gas release in an ore body. Then sulphides are leached by a water leachant containing a salt of multivalent metal capable to oxidation of sulphides in soluble oxidation products. Then extraction of the required valuable metals from separate products of leaching is performed.

EFFECT: exception of blocking in the depths of the flow channel preventing leaching of all required valuable metals.

13 cl

Up!