Procedure for production of ultra-micro-dispersed powder of nickel oxide

FIELD: metallurgy.

SUBSTANCE: procedure consists in electrolysis with asymmetrical alternate current of 50 Hz frequency at heating in alkali medium. Electrolysis is carried out at density of current of anode and cathode half-periods 2.5 A/cm2 and 0.5…2 A/cm2 correspondingly, while size of parts of produced nickel oxide is 9…20 nm.

EFFECT: production of ultra-micro-dispersed powder of nickel oxide applicable for usage in catalytic production of nano carbon materials by pyrolysis of hydrocarbon raw stock.

2 cl, 4 ex

 

The invention relates to methods for producing powders of metal oxides, and in particular to methods of obtaining ultramicrobacteria powder of Nickel oxide. The resulting powder can be used to prepare the catalysts used in the synthesis of carbon nanotubes.

There are various ways to obtain ultramicrobacteria particles of Nickel and its oxides. They can be divided into three large groups: chemical, physical and physico-chemical methods.

1. Chemical methods

These include vapor deposition, recovery in solid and liquid phase pyrolysis, Sol-gel technology.

Method for the synthesis of nanosized particles of Nickel oxide is in the deposition of nitric acid solution in ethanol medium (ethanol, propanol), a diluted solution of sodium hydroxide at a temperature of 60...80°C, followed by washing of precipitates with water and drying at 50°C. the Obtained hydrated oxides of Nickel NiO·nH2O have a specific surface area of 280 mg/cm2[Lincrusta, War, BHU. Production of nano-sized particles of oxides of cerium, copper, cobalt and Nickel // the Second all-Russian conference on nanomaterials, "Nano-2007". 13-16 March 2007. Novosibirsk. S]. One of the problems of receiving such materials from aqueous solutions is agglomeration UltraATA is such particles. To prevent clumping use organic liquids, including alcohol. This expensive and inefficient method finds application in laboratories and for special purposes.

There is a method for the synthesis of nanosized powder of Nickel oxide deposition from solutions, in which as initial reagents used nitrate of Nickel, and the precipitant is ammonium carbonate [Agilos, Ozernovskiy, Avetrana. Production of nano-sized particles of oxides of Nickel and cobalt from solutions // Journal of applied chemistry, 2006, №3. S.353-357]. Formed during thermal decomposition of basic carbonate particles of Nickel oxide have a rounded shape with particle sizes of 5-10 nm.

Nanoparticles of Nickel synthesize traditionally-chemical method in reverse micelles [Swholesale, Are. Synthesis and properties of nanosized Nickel particles and nanocomposites // physical chemistry of surfaces and protection of materials. 2008. No. 4. S.400-403]. To prepare the solution using hydrated nitrate Nickel and trichitillomania water. To obtain reverse micelles as a surface-active composition used a solution of bis(2-ethylhexyl) and sulfosuccinate sodium in isooctane. Adsorption of nanoparticles of Nickel is carried out on silochrome. The prepared solution is irradiated on the installation RKHM-γ-20 (source60). Absorption of radiation dose on ferrosulfate the dosimeter equal 0,26 G/s Value of radiation dose at 17.8 kGy. The resulting Nickel nanoparticles have a spherical shape and sizes of the order of 1 to 100 nm. Found that the oxygen of the metallic Nickel particles are oxidized to nanoparticles of Nickel oxide (II).

Method for obtaining nanosized particles of Nickel oxide chemical recovery from aqueous solutions of salts of Nickel [Alevosia, Gvineria, Averof. Obtaining nanoparticles of Nickel // VII international conference. Moscow - Stavropol: Sevkat, 2007. - 510 C.]. As a stabilizer using 1% aqueous solution of polyvinyl alcohol as a reducing agent used sodium borohydride. The concentration of Nickel sulfate range from 0.1 to 0.001 mol/DM3, sodium borohydride is from 1.0 to 0.01 mol/DM3. The resulting suspension is very stable and remains suspended for more than a week. The sizes of the particles in this solution, have an average radius of 280 nm, with a large asymmetry of the distribution curve in the direction of increasing particle size.

The Nickel powder is produced by recovery from solutions of salts of Nickel, elemental phosphorus, taken in its active form in an alkaline environment, and before recovery to the original solution injected silicone grease [A.S. No. 1479539, CL SI 23/04, 16.03.87, publ. 15.05.89]. The resulting powders have a high ferromagnetic properties, and low bulk weight.

A known method of extraction of the Nickel powder from waste solutions chemical Nickel plating, including his recovery from solutions by hypophosphite sodium, characterized in that to reduce the content of Nickel ions in the solution to the maximum permissible concentrations in the waste electroplating plants recovery of Nickel is carried out in the presence of the Nickel powder at a pH of 6.5...7,0, temperatures 65...70°C and the ratio of the content of Nickel ions and hypophosphite sodium 1:5 [A.S. No. 1673616 CL C22B 3//44, C22B 23/00, 31.05.89, publ. 30.08.91].

Known methods for producing the Nickel powder by restoring its salts with hydrogen by the method [Application Germany No. 2244746, CL C22B 23/04, publ. 10.07.75] solution douglasthe Nickel is treated with gaseous ammonia or aqueous ammonia solution, the precipitate Ni(NH3)6Cl2separated by filtration, dried to a partial transformation in Ni(NH3)2Cl2and restore at 450...1000°C hydrogen; by the way [France Application No. 2227336, CL C22B 23/04, B22A 9/00, publ. 27.12,75] source of Nickel salt solution is treated with alkali metal oxalate, restore the sediment in the autoclave with hydrogen in the presence of a hydroxide of an alkali metal.

Proposed methods for the obtaining of Nickel powder by hydrogen deposition in an autoclave at elevated temperature and pressure [A.S. No. 1126374, CL B22F 9/24, C22B 23/04, 18.05.82. publ. 30.11.84]. With the aim of increasing the activity of powder and cheaper process, the deposition of lead from aqueous slurry of Nickel carbonate with the addition of sulfate ion in an amount equivalent to 0.05 mol of Nickel per 1 mol of Nickel carbonate, and after deposition of the slurry is injected inhibitor with restorative properties. As an inhibitor use formic acid in the amount of 0.5 to 2 g per 1 DM3slurry of Nickel powder.

2. Physical methods

These include techniques based on the processes of evaporation and condensation. The powders are formed as a result of the phase transition of vapor - solid or vapor - solid - liquid in the gas volume or on the surface to be cooled.

Developed a new process of manufacturing a Nickel nano-powder in an atmosphere of various gases (air, argon, nitrogen, helium, xenon. The process is the evaporation of solid natural or technogenic raw materials, followed by rapid cooling of high-temperature steam and condensation of matter in the form of nanoparticles [Sperdakos, Aigerim, Eccucino, Average, Rassimov, Snehadeep, Val. Obtaining nanosized powders by powerful electron accelerator at atmospheric conditions // Laurentian reading in mathematics, mechanics and physics. Novosibirsk, 27-31 may, 2005 http://www.ict.nsc.ru/wsshow_abstract.dhtml?ru+120+66]. The latter can have different sizes from 10 to 500 nm. The process provides a temperature sufficient to vaporize any material at the heating temperature of more than 1000 K/s Additional advantage is fewer production stages.

Obtaining a powder of Nickel oxide is also an electric explosion of Nickel wire with different diameters and length [Whakatau, Averageif, Iveco. Characterization of powders of Nickel oxide obtained by electrical explosion of wire // Journal of technical physics. 2005, t, vyp. P.39-41]. Apply discharge circuit with an inductance of 0.5 μh, and the capacitance of the capacitor Bank 3,2 international film festival. Charging voltage change from 10 to 33 kV. The explosion is carried out at normal pressure in a mixture of nitrogen and oxygen and the change in concentrations of from 10 to 30%. The resulting particles have different shapes both monocrystalline and polycrystalline structure with a particle size of about 100 nm.

3. Physico-chemical methods

These include the processes of evaporation - condensation involving chemical reactions, electro-deposition, drying - freezing.

Ultramicrobacteria powder of Nickel oxide can be obtained by the method of freeze-drying [Roehrig F.K., T.R. Wright Freeze drying: a unigue approach to the synthesis of ultrafine powders. - J. Vac. Sci. and Techn., 1972. 9. No. 6. P.1368-1372]. Of raw materials,in particular metal salts, prepare a solution of the required composition, which quickly freezes by spraying into the chamber with a cryogenic environment (e.g., liquid nitrogen). Then the pressure of the gaseous medium above the frozen granules is reduced so that it was below the equilibrium point formed by the cooling system, and the material is heated in a vacuum to the sublimation of the solvent. The resulting product consists of a very thin porous granules of the same composition. Further processing depends on the purpose of the final powder. Calcination of the pellets in the air, you can get the oxides of Nickel, recovery powder suitable metal.

The Nickel powder is produced by electrolysis of ammonium sulfate solutions of Nickel (the source material is with NISO4·7H2O). The electrolyte contains 5...15 g/DM3Nickel (Ni2+), 75...80 g/DM3ammonium sulfate, 2...3 g/DM3sulfuric acid, 40...50 g/DM3ammonium chloride and 200 g/DM3sodium chloride. The electrolysis is conducted at the temperature of the electrolyte 35...55°C, current density of 1000...3000 a/m2and the voltage on the tub 10...15 Century, the current Output is up to 90...94%, and the power consumption of about 3000 kWh/t [Libenson GA Fundamentals of powder metallurgy. M: Metallurgy. 1975, s].

Describes the process of obtaining powders of oxides of Nickel by electrolysis on a symmetric alternating current (5 Hz), according to which the maximum rate of destruction of the Nickel - 20 mg/(cm2·h) was observed in 17 M sodium hydroxide solution at current density of 2.5 a/cm2the electrolyte temperature 70°C [Cab. The destruction of Nickel and cadmium in the electrolysis of alternating current of industrial frequency // Bulletin of the Tomsk Polytechnic University. 2003. No. 1. P.23-24].

The closest in technical essence and the resulting effect to the claimed method is a method of obtaining Nickel oxide, described in [HAB. The destruction of Nickel and cadmium in the electrolysis of alternating current of industrial frequency // Bulletin of the Tomsk Polytechnic University. 2003. No. 1. P.23-24] (prototype).

Existing methods are characterized by low productivity, high temperature and various chemical reagents, creating environmental problems in industrial implementation.

Our proposed method of obtaining ultramicrobacteria powder of Nickel oxide on an asymmetric alternating current environmentally friendly, as the process is carried out in 17 M sodium hydroxide solution at temperatures up to 60°C, the voltage at the cell 4 In and not use any radioactive, toxic materials and components, and high voltage in contrast to existing industrial methods. Besides, soon the be the destruction of the Nickel electrodes (education ultramicrobacteria powder of Nickel oxide) increases in 3 times in comparison with the prototype.

The method is as follows.

The electrolysis is carried out in temperature-controlled cell with a volume of 200 ml in 17 M solution of sodium hydroxide AC 50 Hz. The electrodes and thermometer is fixed in the insulating cover, such as Teflon or polypropylene. A constant solution temperature (60°C) pot support with the help of a thermostat with an accuracy of 0.5°C. after a predetermined time process, the electrodes are removed from the cell, washed with distilled water and alcohol, and then weighed on an analytical balance. The resulting powder was separated by filtration, washed with distilled water, dried and weighed. The rate of destruction of Nickel and education ultramicrobacteria powder of Nickel oxide determined by the gravimetric method.

Distinctive features of the proposed method are:

the process of education ultramicrobacteria powders of Nickel oxide in a concentrated alkali solution to an asymmetric alternating current with a current density of anodic and cathodic half-cycle 2.5 a/cm2and 0.5...2 A/cm2respectively.

The proposed method for ultramicrobacteria powder of Nickel oxide is illustrated by the following examples.

Example 1

The electrolysis of a concentrated solution of alkali on an asymmetric alternating current hour is Auteuil 50 Hz with a current density of anodic and cathodic half-cycle 2.5 a/cm 2and 2 A/cm2accordingly carried out in temperature-controlled cell with a volume of 200 ml. of Electrodes and thermometer is fixed in the insulating cover, for example, PTFE or polypropylene. The temperature of the solution in the cell (60°C) support using a thermostat with an accuracy of 0.5°C. the dissolution Rate of Nickel determined by the gravimetric method. The surface speed of the destruction of Nickel is 35 mg/(cm2·h). Corresponding to this value of surface the rate of formation of Nickel oxide is equal to 49 mg/(cm2·h). The particle size of the obtained Nickel oxide is 9...20 nm.

Example 2

In the conditions of example 1 the process of education ultramicrobacteria powders of Nickel oxide in a concentrated alkali solution is performed on asymmetric alternating current with a current density of anodic and cathodic half-cycle 2.5 a/cm2and 1.5 a/cm2respectively. The surface speed of the destruction of Nickel is 42 mg/(cm2·h). Corresponding to this value of surface the rate of formation of Nickel oxide is equal to 59 mg/(cm2·h).

Example 3

In the conditions of example 1 the process of education ultramicrobacteria powders of Nickel oxide in a concentrated alkali solution is performed on asymmetric alternating current with a current density of anodic and cathodic half-cycle 2.5 a/cm2and 1 A/cm2with therefore, its. The surface speed of the destruction of Nickel is 64 mg/(cm2·h). Corresponding to this value of surface the rate of formation of Nickel oxide is equal to 90 mg/(cm2·h).

Example 4

In the conditions of example 1 the process of education ultramicrobacteria powders of Nickel oxide in a concentrated alkali solution is performed on asymmetric alternating current with a current density of anodic and cathodic half-cycle 2.5 a/cm2and 0.5 A/cm2respectively. The surface speed of the destruction of Nickel is 35 mg/(cm2·h). Corresponding to this value of surface the rate of formation of Nickel oxide is equal to 49 mg/(cm2·h).

1. The method of obtaining ultramicrobacteria oxide powder of Nickel from Nickel electrodes, including the electrolysis of alternating current with frequency of 50 Hz during heating in an alkaline medium, characterized in that the electrolysis is carried out in an asymmetric alternating current with a current density of anodic and cathodic half-cycle 2.5 a/cm2and 0.5...2 A/cm2accordingly, the particle size of the obtained Nickel oxide is 9...20 nm.

2. The method according to claim 1, characterized in that to achieve the highest speeds of education ultramicrobacteria powder of Nickel oxide electrolysis is carried out with a current density of anodic and cathodic half-cycle 2.5 a/cm2and 1 A/cm2rela is estwenno.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: there are used soluble and insoluble anodes connected to separate sources of current for control over soluble anode dissolution during process of electrolysis and concentration of ions of metal in solution by means of correcting ratio of anode strengths of current of soluble and insoluble anodes at constant value of cathode density of current. Also, constant value of cathode density of current is achieved by constant area of cathode and sum of current strength on the soluble and insoluble anodes.

EFFECT: avoiding labour-intense operation of correction of electrolyte due to equalising cathode and anode current outputs at production of powders of metal.

8 dwg, 3 ex

FIELD: electricity.

SUBSTANCE: metal particles from electrolyte are deposited on substrate till the stage of formation of icosahedral micro- and nano-particles is ended. Then, particles are subject to annealing in neutral medium at temperature of 450-500°C with exposure during 25-60 minutes. Heating to annealing temperature is performed with speed of 5-15°C/min. After annealing the conditions for particle destruction are created. Obtained micro- and nanoparticles are separated from substrate prior to annealing or after annealing.

EFFECT: enlarging specific surface area of obtained powders and improving efficiency of their use.

3 cl, 4 dwg

FIELD: metallurgy.

SUBSTANCE: invention relates to production of copper nanoparticles to be used as biocide component in medicine and veterinary science. Proposed method comprises dissolving stabilising components in solvent, introducing anode nanoparticles, in the form of copper plate and node, into stabiliser solution, and electrochemical dissolution of anode in causing stabilised direct current to flow through the solution. Note here that distilled water is used as a solvent, while organic and inorganic stabilising components are used as stabilisers. Dissolution of stabilising components is carried out in two stages. Note here that, first, in heating and mixing, organic stabilising components are dissolved, and, then after cooling at mixing, inorganic components are dissolved. Note also that stainless steel plate is used as cathode.

EFFECT: copper nanoparticles are produced in aqueous medium that features high stability.

1 tbl, 6 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to production of copper nanoparticles to be used as biocide component in medicine and veterinary science, etc. Proposed method comprises dissolving stabilising components in solvent, introducing anode nanoparticles, in the form of copper plate and node, into stabiliser solution, and electrochemical dissolution of anode in causing stabilised direct current to flow through the solution. Note here that distilled water is used as a solvent, while organic and inorganic stabilising components are used as stabilisers. Dissolution of stabilising components is carried out in two stages. Note here that, first, in heating and mixing, organic stabilising components are dissolved, and, then after cooling at mixing, inorganic components are dissolved. Note also that stainless steel plate is used as cathode.

EFFECT: production of nanoparticles with strongly pronounced bactericidal Catalytic, antirust and magnetic properties.

1 tbl, 6 ex

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy, in particular, to production of electrolytic powders. To produce silver powders, silver is settled down from electrolyte containing hydrogen nitrate silver nitrate at electrolyser plant comprising soluble anode made from silver and cathode. Flocculants "АК" or "Магнафлок" are added as polyacrylamide-based surfactants into electrolyte in amount of 30-200 mg per 1 kg of produced silver powder. Deposition is performed at revering current and periodic change of anode and cathode polarity.

EFFECT: high yield of powders.

1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy, particularly to silver powders for electrodes of chemical current source and metalceramic contacs and method of its receiving. It is precipitated silver hydroxyde from the solution of silver nitrate by solution of potassium hydroxide. Received silver hydroxyde is flushed and thermally disintegrated for silver oxide and water. Received silver oxide is mechanically treated and it is implemented thermal reconditioning up to metallic silver. Received powder is flushed from potassium hydroxyde at temperature 60÷80°C during 30÷60 minutes, crushed and compacted in ball crusher during 15÷20 minutes and separated for particle fractions by sizes. Received silver powder consists of cellular particles of value less than 56 mcm, with pores size in particles 0.3-3.0 mcm, allows specific surface area 0.07-0.12 m2/g and packed density 1.4-1.7 g/cm3 or from porous particles of size 56-160 mcm, with pores size in particles 0.3-5.0 mcm, allows specific surface area 0.1-0.2 m2/g, packed density 1.8-2.4 g/cm3 and fluidity 7-12 g/s or from porous particles of value 160-450 mcm, with pores size in particles 0.3-5.0 mcm, allows specific surface area 0.15-0.25 m2/g, packed density 1.8-2.7 g/cm3 and fluidity 8-14 g/s.

EFFECT: it is provided receiving of powder with defined structural and processing characteristics.

10 cl, 3 dwg, 1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention can be used for electrochemical isolation of metal chosen from the group consisting of copper, tin, manganese, zinc, nickel, chrome and cobalt, from solutions, containing metal ions. Cell contains anode chamber, cathode chamber allowing falling cathode layer in the form of growing metal balls and separated from the anode chamber by means of electrically isolating diaphragm and vertical external pipeline for passing of upstream of metal balls and electrolyte, directed for feeding of cathode layer. At least one ejector located inside external pipeline nearby its foundation or nearby the bottom of cathode chamber or on the outside of the cell in hydraulic communication with the bottom of cathode chamber is provided for installation of metallic balls and electrolyte upstream. Cell is described by process continuity of metal extraction, more simple for control and operation.

EFFECT: providing of process continuity of metal extraction.

17 cl, 5 dwg

FIELD: nanotechnologies.

SUBSTANCE: invention relates to methods for obtaining nanoparticles of platinum metals - iron alloy. The method includes electrochemical dissolution of iron - platinum metal alloy, at controllable value of anode potential from +0.1 to +0.6 V with production of nanoparticles of the size of 0.5 - 10 nanometers in the form of non-dissolved deposit with of iron content of up to 40% from the sediment mass. At electrochemical dissolution of the iron-platinum metal alloy with the content of platinum metal of up to 10 wt % in sulphate-chloride dissolvent, anode potential is set to a value of +0.1 V to produce nanoparticles of the size of 5-10 nanometers with the iron content of up to 40 % from the sediment mass of the deposit, and to a value of +0.6 V to produce nanoparticles of the size of 0.5-5 nanometers with iron content of up to 10% from deposit mass. At electrochemical dissolution of iron-platinum-palladium-rhodium-iridium alloy with platinum content of 2.5%, palladium content of 2.5%, rhodium content of 2.5% and iridium content of 2.5% from mass of the alloy, anode potential is set to a value of +0.6 V to produce nanoparticles of the size of 1-5 nanometers with iron content of 10% from the sediment mass. The technical result is the possibility to produce nanoparticles of necessary composition and structure adjusting potential of the anode.

EFFECT: chances to obtain nanoparticles of necessary structure and composition by adjusting anode potential value.

4 cl, 4 ex

FIELD: nanotechnologies.

SUBSTANCE: invention relates to methods for obtaining platinum metal nanoparticles. The method includes electrochemical dissolution of non-ferrous and platinum metals alloy at controllable value of anode potential from +0.1 to +1.2 V with production of nanoparticles of 1-15 nanometers. At dissolution of nickel-platinum metal alloy with platinum metal content of up to 5 wt % in sulphate-chloride dissolvent, anode potential is set to a value of +0.3 V to produce nanoparticles of the size of 10-15 nanometers and to a value of up to +0.8 V to produce noparticles of the size of 1-7 nanometers. At dissolution of nickel-platinum-palladium-rhodium alloy with platinum content of 2%, palladium of 1.5% and rhodium of 1.5 % from mass of alloy, anode potential is set to a value of +0.8 V to +1.2 V to produce nanoparticles of the size of 1-5 nanometers. At dissolution of copper-platinum metal alloy in sulfuric acid, anode potential is set to a value of +0.6 V to produce nanoparticles of the size of 1.0-4.0 nanometers.

EFFECT: chances to obtain nanoparticles of necessary structure and composition by adjusting anode potential value.

5 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention pertains to electrochemical decomposition of solid substances. Description is given of an electrolyte cell, consisting of an electrically insulated case and two permeable electrodes fitted inside the case. At least one electrode consists of a support plate with openings, perforated electrode plates, and a filtering cloth, put between the support plate with openings and the electrode plate. The cathode is separated from the inside part of the cell by a filler sheet made from permeable non-conducting material. On the cathode side there is a distribution chamber for the electrolyte, and on the anode side there is a collecting chamber for the electrolyte. The cell also consists of a recirculation duct between the collection chamber and the distribution chamber, fitted outside the cell, a device for returning the electrolyte from the collection chamber to the distribution chamber. This electrolyte cell can be used for decomposing powders.

EFFECT: longer life span of electrodes with low consumption of material during production.

15 cl, 1 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: procedure for production of nano-structured agglomerate of metal cobalt consists in interaction of solutions of cobalt salt of general formula CoX2, where X2 are chlorides, nitrates and/or sulphides with reagents and in reduction at higher temperature. A stabilising agent is introduced into solution before reaction of solutions of cobalt salts with reagents. As a stabilising agent there is used sodium-potassium tartrate. Simultaneously introduced alkali in form of NaOH or KOH are used as reagents at interaction and reduction, while as a reducing agent there is used hydrazine hydrate.

EFFECT: production of new nano structured fractal agglomerates of metal cobalt by simple method under soft process conditions; production of target product of high purity.

7 cl, 4 dwg, 5 ex

FIELD: metallurgy.

SUBSTANCE: procedure consists in sorption of cobalt on complex forming ionite from manganese containing solution and of desorption of cobalt from ionite. Desorption of cobalt is performed with solution with pH value=4.5÷5.5 containing ions of copper and(or) nickel possessing higher affinity to functional groups of ionite, than cobalt.

EFFECT: reduced amount of solution processing stages, reduced consumption of reagents and process equipment, increased efficiency and reduction of process cost.

1 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: there are performed following stages: ore leaching at presence of hydrochloric acid with formation of soluble chloride of metal in solution for leaching, addition of sulphuric acid and/or sulphur dioxide into solution for leaching, regeneration of solid sulphate of metal or sulphate of metal from solution for leaching, regeneration of hydrochloric acid and continuous transformation of at least part of hydrochloric acid from solution into vaporous phase. Further, vaporous hydrochloric acid is absorbed and returned to the leaching stage. The sulphuric acid and/or sulphur dioxide are added to solution for leaching during process of leaching or after it. Valuable metal is usually chosen from group including Zn, Cu, Ti, Al, Cr, Ni, Co, Mn, Fe, Pb, Na, K, Ca, metals of platinum group and gold. Metal in sulphate of metal or sulphite of metal corresponds to valuable metal or less valuable metal in comparison with metal leached from ore, for example, magnesium.

EFFECT: raised efficiency of procedure.

14 cl, 27 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: procedure consists in following stages: ore leaching at presence of hydrochloric acid with production of soluble metal chloride in solution for leaching, addition of sulphuric acid into solution for leaching, extraction of metal sulphate from solution for leaching and regeneration of hydrochloric acid. As ore there is used oxide ore of non-ferrous metal, such as oxide zinc ore, laterite nickel ore such as saprolite or limonite, sulphide ore or titanium ore. Valuable metal is chosen from group including Zn, Cu, Ti, Al, Cr, Ni, Co, Mn, Fe, Pb, Na, K, Ca, metals of platinum group and gold. Valuable metal or less valuable metal, such as magnesium, can be metal in composition of metal sulphite. Regenerated hydrochloric acid is directed into re-circulation system into process of leaching.

EFFECT: raised efficiency of procedure.

40 cl, 36 dwg, 5 tbl

FIELD: metallurgy.

SUBSTANCE: procedure for processing final tailings of galvanic production consists in crumbling, leaching, separation of solution from sedimentation and in extracting heavy non-ferrous metals from produced solution. Also, final tailings are crumbled with mechanic-chemical activation by wet crumbling in form of pulp suspension at pH≤3 and ratio s (solid): l (liquid) = 1:(0.4-1) and temperature 60-90°C.

EFFECT: reduced harmful environmental impact and power expenditures due to elimination of thermal treatment stage at processing final tailings; raised efficiency of extraction of heavy metal compounds.

3 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: there are used soluble and insoluble anodes connected to separate sources of current for control over soluble anode dissolution during process of electrolysis and concentration of ions of metal in solution by means of correcting ratio of anode strengths of current of soluble and insoluble anodes at constant value of cathode density of current. Also, constant value of cathode density of current is achieved by constant area of cathode and sum of current strength on the soluble and insoluble anodes.

EFFECT: avoiding labour-intense operation of correction of electrolyte due to equalising cathode and anode current outputs at production of powders of metal.

8 dwg, 3 ex

FIELD: metallurgy.

SUBSTANCE: procedure consists in leaching at atmospheric or raised pressure, in production of effluent and in utilisation of ion-exchanging resins for absorption and extraction of nickel and cobalt. Before extraction of nickel and cobalt effluent in form of solution or pulp is treated with cation or chelate resin possessing selectivity relative to extraction of iron, aluminium and copper for their removal; it also increases pH of solution.

EFFECT: elimination of neutralisation stage of solution, efficient purification of effluent, prevention of nickel losses and avoiding division of solid and fluid phase of formed pulp at laterite ore leaching.

6 cl, 2 dwg

FIELD: metallurgy.

SUBSTANCE: procedure consists in leaching with chloride solution at supply of chlorine, in purification of solution from copper and in production of copper sulphide cake, in extracting concentrate of precious metals and in electro-extraction of nickel from solution. Prior to leaching matte is separated to a sulphide and metallised fractions. The sulphide fraction is subjected to leaching with chloride solution with supply of chlorine. The metallised fraction produced at separation of matte is added into pulp produced at leaching thus performing purification of solution from copper and its withdrawal to copper sulphide cake. Upon purification of solution from copper solution is purified from iron, zinc and cobalt. Copper sulphide cake is roasted and produced cinder is leached. Solution is directed to electro-extraction of copper, while concentrate of precious metals and chamber product are extracted from residue by flotation.

EFFECT: reduced material and operational expenditures and losses of non-ferrous and precious metals.

2 cl, 12 ex, 2 dwg

FIELD: metallurgy.

SUBSTANCE: procedure consists in processing wastes with sulphuric acid at raised temperature, in supplying hydrogen peroxide, in introducing rhenium, nickel and cobalt into leaching solution and in concentrating tungsten, niobium and tantalum in insoluble residue. Further, solution is separated from insoluble residue; extraction of rhenium from solution is leached with secondary aliphatic alcohol. Extract is washed and rhenium is re-extracted with leaching solution upon extraction. Hydrogen peroxide is supplied after main part of nickel and cobalt have passed into solution at maintaining redox potential in interval of 0.50-0.75 V relative to a saturated chlorine-silver electrode, while extraction of rhenium, extract washing and rhenium re-extraction are carried out on 2-5 steps.

EFFECT: increased extraction of rhenium at reduced consumption of oxidant, increased safety of procedure due to separated in time operations followed with release of hydrogen and oxygen.

6 cl, 4 ex

FIELD: metallurgy.

SUBSTANCE: procedure consists in underground leaching nickel with solution of sulphuric acid and in pumping product solution out. Further, acidity of product solution is reduced, and nickel is sorbed on ionite resin with its following desorption. Upon desorption raffinate of nickel sorption is made-up with sulphuric acid and directed to leaching as leaching solution. Also, excessive sulphuric acid is sorbed on separate ionite with following desorption for reduction of product solution acidity. Upon nickel sorption raffinate is made-up with sulphuric acid and with sulphuric acid after operation of its desorption.

EFFECT: simplification of process, increased ecological safety and reduced consumption of sulphuric acid.

1 dwg, 1 tbl

FIELD: metallurgy, in particular complex metal recovery from oxidized ore.

SUBSTANCE: claimed method includes granulation with sulfuric acid. Obtained granules are sulfated at 250-4500C for 1-2 h in one or two steps. Then leaching of nickel and other metal sulfates are carried out followed by metal recovery using known methods. Invention is useful in reprocessing of oxidized nickel-cobalt ores, as well as laterite ores containing nickel, cobalt, and copper, and iron-manganese nickel-containing nodules.

EFFECT: high yield nickel recovery; inexpensive and usable equipment.

3 cl, 3 tbl, 4 ex

Up!