Method for europium (iii) from salt solutions |
|
IPC classes for russian patent Method for europium (iii) from salt solutions (RU 2482201):
Processing method of red muds of alumina industry / 2480412
Invention refers to non-ferrous metallurgy, and namely to complex processing of red muds of alumina industry. Processing method of red muds of alumina industry involves obtaining of red mud pulp, extraction and concentration of rich components by combination of classification and magnetic separation methods. After the pulp classification, fine-grain fraction pulp is extracted and subject to vibrocavitation treatment and further magnetic separation with extraction of magnetic and non-magnetic products. At that, magnetic product is subject to additional classification so that iron-bearing and scandium-bearing concentrates are obtained.
 Method of producing scandium oxide / 2478725
Proposed method comprises dissolving scandium-bearing concentrate in sulfuric acid, removing acid-insoluble residue, and precipitating scandium in the presence of ammonium compounds. Then, precipitate is filtered, flushed, dried and calcined to obtain scandium oxide precipitate. With acid-insoluble residue removed, sulfuric acid concentration in filtrate is increased to 540-600 g/dm3, ammonium chloride is added to solution in amount of 26.7-53.5 g/dm3 at 50-70°C and held for one hour at mixing. Produced precipitate is flushed by ethanol at volume ratio of 1-10-11.
 Method of extracting yttrium (iii) from salt solutions / 2478724
Method of extracting yttrium (III) from salt solutions involves floatation extraction using an organic phase and a collector. The organic phase used is isooctyl alcohol. The collector used is an anionic surfactant - sodiium dodecyl suphate in a concentration which corresponds to the stoichiometry: Y+3+SDS-=Y[DS]3, where Y+3 is a yttrium cation, DS- is a dodecyl sulphate ion. Floatation extraction is carried out at pH=7.0-7.8 and ratio of the organic phase to the aqueous phase of 1/20-1/40.
 Complex processing method of carbon-silicic black-shale ores / 2477327
Invention refers to complex processing method of carbon-silicic black-shale ores, which contain vanadium, uranium, molybdenum and rare-earth elements. The above method involves ore crushing to the particle size of not more than 0.2 mm and two leaching stages. Oxidation sulphuric-acid leaching is performed at atmospheric pressure. Autoclave oxidation sulphuric-acid leaching is performed at the temperature of 130-150°C in presence of oxygen-containing gas and addition of a substance forming nitrogen oxide, as a catalyst of oxygen oxidation. Ion-exchange sorption of uranium, molybdenum, vanadium and rare-earth elements is performed from the obtained product solution.
Method of extracting rare-earth elements from phosphogypsum / 2473708
Invention relates to the technology of producing compounds of rare-earth elements during complex processing of apatites, particularly extraction of rare-earth elements from phosphogypsum. The method involves preparation of pulp from phosphogypsum and sorption of rare-earth elements on a sorbent. The pulp is prepared from ground phosphogypsum and sulphuric acid solution with pH=0.5-2.5 until achieving liquid:solid ratio of 4-7. Sorption is carried out directly from the phosphogypsum pulp on a sorbent with sulphuric acid functional groups for 5-7 hours with solid:sorbent ratio of 4-7.
 Universal method of selective extraction of salts of transition, rare-earth and actinoid elements from combination solutions by means of nanoporous materials / 2472863
Method involves selective extraction of salts in volumes of nanopores of nanoporous conducting materials due to effect of electrostatic interaction of dipole moments of solvated ionic complexes of transition, rare-earth and actinoid elements with electric field of double electric layer of "nanopore wall - solution" boundary line. The method is implemented by subsequent filling of nanopore of nanoporous conducting material with the solution containing ionic complexes of transition, and/or rare-earth and/or actinoid elements, displacement from nanopore of ionic complexes of transition, rare-earth and actinoid elements weakly localised in nanopores by means of pressure of gases or liquids, by filling of nanopore with solution of inorganic acid of high concentration, and by extracting from nanopores of residual ionic complexes of transition, rare-earth and actinoid elements by means of pressure of gases or liquids. The above method can be implemented in an electrochemical cell.
 Extraction method of rare-earth metals from phosphogypsum / 2471011
Invention can be used in the technology of obtaining the compounds of rare-earth metals at complex processing of apatites, and namely for obtaining of concentrate of rare-earth metals (REM) from phosphogypsum. Method involves sorption of rare-earth metals. At that, prior to sorption, phosphogypsum is crushed in water so that pulp is obtained in the ratio Solid : Liquid=1:(5-10). Sorption is performed by introducing to the obtained pulp of sorbent containing sulphate and phosphate functional groups, at the ratio of Solid : Sorbent=1:(5-10) and mixing during 3-6 h.
Processing method of micro production wastes of constant magnets / 2469116
Method involves oxidation of micro production wastes at temperature of 550-650°C in air atmosphere for destruction of crystal latitude Nd2Fe14B so that Fe2O3, Nd2O3, Fe2B is formed and moisture and oil is removed. Then, anhydrous fluorides of rare-earth metals are obtained and their metallothermic reduction is performed for production of constant magnets. After oxidation from oxidated microwastes is completed, rare-earth metals are leached with nitric acid with concentration of 1-2 mol/l at temperature of 20-80°C. Obtained nitrate solutions containing rare-earth metals and impurity elements are processed with solution of formic acid with extraction of formiates of rare-earth metals in the form of the deposit cleaned from impurity elements, which includes iron, aluminium, nickel, cobalt, copper and other transition metals.
Method of extracting rare-earth elements from wet-process phosphoric acid / 2465207
Invention relates to methods of extracting a concentrate of rare-earth elements from wet-process phosphoric acid, which is obtained in a dihydrate process of processing an apatite concentrate, and can be used in chemical and related industries. The method involves sorption of rare-earth elements and thorium contained in wet-process phosphoric acid at temperature 20-85°C, wherein the sorbent used is a sulphoxide cationite, washing the saturated sorbent with water, desorption of rare-earth elements and thorium with concentrated ammonium sulphate solution to form a desorbate, and treating the desorbate with an ammonia-containing precipitant in form of ammonium carbonate or ammonia gas, which is fed in two steps, wherein at the first step the precipitant is fed until achieving pH 4.5-5.0 with precipitation and separation of a thorium-containing precipitate, and at the second step - until achieving pH of not less than 7 with precipitation and separation of a concentrate of rare-earth elements.
 Method to extract holmium (iii) cations from nitrate solutions / 2463370
Method to extract holmium (III) cations from nitrate solutions includes ion floatation using an anion-type surfactant as a collector. Besides, the collector is dodecyl sodium sulfate in a concentration corresponding to stoichiometry of the following reaction: Ho+3+3C12H25OSO3Na=Ho[C12H25OSO3]3+3Na+, where Ho+3 - holmium cation, C12H25OSO3Na - sodium dodecyl sulfate. Moreover, ion floatation is carried out at pH=6.6-7.4, which makes it possible to achieve 90% extraction of holmium from aqueous solutions of its salts.
 Method of extracting samarium (iii) cations / 2481141
Invention relates to extraction of substances with organic extractants from aqueous solutions, particularly a method of obtaining samarium (III) cations from impoverished or industrial material using a liquid extraction technique. The method of extracting samarium (III) cations involves liquid extraction using an extractant - isooctyl alcohol and an organic diluent in form of sodium dodecylsuphate in a concentration which corresponds to stoichiometry. Extraction is carried out at pH=3.0-6.0.
Method of producing scandium oxide / 2478725
Proposed method comprises dissolving scandium-bearing concentrate in sulfuric acid, removing acid-insoluble residue, and precipitating scandium in the presence of ammonium compounds. Then, precipitate is filtered, flushed, dried and calcined to obtain scandium oxide precipitate. With acid-insoluble residue removed, sulfuric acid concentration in filtrate is increased to 540-600 g/dm3, ammonium chloride is added to solution in amount of 26.7-53.5 g/dm3 at 50-70°C and held for one hour at mixing. Produced precipitate is flushed by ethanol at volume ratio of 1-10-11.
 Luminescent coordination compounds of lanthanides for light-emitting diodes / 2478682
Invention relates to complexes of lanthanides and organic ligands which are luminescent in the visible spectrum and are used in electroluminescent devices, means of protecting security paper and documents from falsification etc. Disclosed are novel luminescent coordination compounds of lanthanides of formula:
 Electrolytic method for obtaining ultradisperse powder of lanthanum hexaboride / 2477340
Method for obtaining pure lanthanum hexaboride is implemented by combined electrodeposition of lanthanum and boron from chloride molten metal on the cathode and their further interaction at atomic level. The process is performed in three-electrode quartz cell, where a tungsten bar serves as a cathode; a glassy carbon bar sealed in pyrex glass serves as a comparison electrode; a glassy carbon melting pot serves as anode and at the same time as a container. Synthesis of ultradisperse powder of lanthanum hexaboride is performed by means of controlled potential electrolysis from equimole KCl-NaCl melt containing lanthanum trichloride and potassium fluoroborate in the environment of cleaned and dried argon at potentials of -2.0 to -2.6 V relative to glassy carbon comparison electrode at the temperature of 700±10°C.
Method of obtaining compounds of divalent lanthanides / 2471710
Invention relates to methods of obtaining novel compounds of divalent lanthanides Ln(II), namely to method of obtaining compounds LnCl2·0.5H2O·(0.04-0.07)Bui 4Al2O. Method of obtaining compounds of lanthanides LnCl2·0.5H2O·(0.04-0.07)Bui 4Al2O, where Ln=Sm or Ln=Yb lies in reduction of trivalent lanthanides Ln(III), with crystallohydrates YbCl3·6H2O and SmCb·6H2O being used as such, to divalent lanthanides Ln(II), on condition that molar ratio LnCl3·6H2O/Bui 3Al constitutes 1/50-70, and reaction takes place at atmospheric pressure, room temperature, in hexane, in nitrogen atmosphere.
Method of obtaining alcohol solvate of neodymium chloride / 2468995
Invention relates to method of obtaining alcohol solvate of neodymium chloride, which can be used as component for obtaining catalyst of polymerisation of diene hydrocarbons. Method includes mixing water neodymium chloride with monoatomic alcohol or mixture of monoatomic alcohols and with paraffinic or aromatic hydrocarbon or their mixture, inert with respect to organoaluminium compounds, with concentration of neodymium in obtained mixture 3.7-12.5 wt %. Water neodymium chloride is obtained by step-by step removal of crystallisation water from neodymium chloride hexahydrate by heating with mixing in vacuum, supplying nitrogen through the layer of dried product to the content of 3.0-3.5 mole of water per 1 mole of neodymium chloride at temperature from 70 to 105°C and further to content of water not more than 0.8 mole per 1 mole of neodymium chloride at temperature from 130 to 135°C.
Electrolytic method of obtaining ultrafine powder of gadolinium hexaboride / 2466217
Anhydrous gadolinium trichloride is used as gadolinium source, potassium fluoroborate is used as boron source, and equimolar mixture of potassium and sodium chlorides is used as base electrolyte. Electrolysis is carried out in potentiostatic mode at temperature of 700±10°C, current densities of - 0.1 to - 1.0 A/cm2 and electrolysis potential of - 2.6 to -2.8 V relative to glass-carbon quasi-stationary comparison electrode.
 Method and device for recovery of powder gadolinium oxide wastes / 2466092
Invention relates to processing of wastes of various mixes, in particular, inorganic wastes, and may be used for recovery of powder gadolinium oxide wastes. Proposed method comprises extracting gadolinium oxide powder fro waste material and its cleaning of impurities. Note here that cleaning is performed by flotation in mixing the pump with disperse phase unless homogeneous pulp is produced. Then, tank with pulp is subjected to dynamic loading till compaction of settled powder of Gd2O3 to single-piece mass with dark layer of impurities on its surface. Then, flotation medium is removed to cut top dark layer from compacted precipitate to layer of clean gadolinium oxide colour. Then, residues of compacted piece are placed onto pan to be dried in air furnace to allow separating the fractions by sieving. Now, prior to reuse of recovered Gd2O3 powder, its quality is inspected by spectral analysis.
Electrolytic method of producing ultrafine cerium hexaboride powder / 2466090
Invention relates to electrolytic methods of producing pure cerium hexaboride. The cerium source used is 1-4 wt % anhydrous cerium chloride, the boron source is 1-3 wt % potassium fluoroborate and the background electrolyte is a eutectic mixture of potassium, sodium and cerium chlorides, which makes up the balance amount. Synthesis of ultrafine cerium hexaboride powder takes place via electrolysis from a eutectic melt of KCl-NaCl-CsCl, which contains cerium chloride and potassium fluoroborate.
 Method of producing colloidal solutions of luminescent nanoplates of rare-earth oxides / 2465299
Solution of rare-earth salts is prepared, for example, nitrates of gadolinium, europium, terbium and ytterbium, in non-polar solvents - oleyl amine, oleic acid or compositions thereof with concentration of rare-earth elements of 0.05-0.1 mol/l. The solution is heated in an inert atmosphere of argon to 80-100°C and held at that temperature for 15-30 minutes. Diphenyl ether is then added in amount of 5-10 moles of ether per mole of rare-earth elements. The mixture is heated to 250-300°C and held for 1-2 hours. Excess polar solvent - acetone - is added to the obtained mixture. The coagulated nanoparticles are separated from the solution by centrifuging and the residue is redispersed in excess heptane. Colloidal solutions of luminescent nanoplates of rare-earth oxides with average diameter of 8-17 nm and thickness of 1-15 nm are obtained.
Method of dressing man-made mineral stock of nonferrous metals / 2480290
Invention relates to flotation of man-made stock. Method of flotation of sulfide ores of nonferrous and noble metals comprises conditioning crushed ore with dithiophosphate solution or other sulfhydric collectors in lime medium and flotation. Note here that for reduction in floatability of pyrite and increase in extraction of metal up to 10 wt % of thiourea ((NH2)2CO) or its derivatives are preliminary introduced in the solution of dithiophosphate as a modifying agent. Then, pulp from ore is conditioned, first, with modified dithiophosphate at pH 8.5-9.0 for 3-5 minutes and, then, with, xanthate at pH over 9.0 for 1.0 minute. Then flotation of sulphides of nonferrous metals and mineral forms of noble metals at input of modified of dithiophosphate and xanthate varying from 1:3 to 3:1, respectively.
|
FIELD: metallurgy. SUBSTANCE: invention relates to hydrometallurgy, in particular, to the method for extraction of europium (III) from salt solutions by floating extraction. In process of floating extraction of europium (III) cations the organic phase is represented by isooctyl alcohol, and the collector of surfactants of anion type is sodium sodium dodecyl sulfate in the concentration corresponding reaction stoichiometry: Eu+3+3NaDS=Eu(DS)3+Na+, where Eu+3 - cation of europium (III), DS- - dodecyl sulfate-ion. At the same time the floating extraction is carried out at pH=7.5-8.5, and at the ratio of organic and water phases 1/20-1/40. EFFECT: increased extent of europium (III) extraction. 2 dwg
The invention relates to enrichment, in particular to methods for rare earth metals (REM) or their oxides from poor or man-made materials using the method of protectable. The known method photoexciting extraction of cobalt in the form cyanide complexes (Walkowiak W. Ion flotation and solvent sublation of cobalt cyanides // J. Chem. Biotechnol. 1980. V.30. P.611-619). The extraction was performed from aqueous solutions using as colligenda the pyridinium chloride. Isooctyl alcohol was used as the organic phase. The disadvantages of the method are the length of the process, the complex composition of the extracted complexes and incomplete extraction of metal cations. The method for extracting heavy metals such as Nickel, cobalt and copper, the method protectable (K..Valsaraj, G.J.Thoma, L.J.Thibodeaux Nonfoaming adsorptive bubble separation processes // Separations Technology, V.1, Iss. 5, 1991, P.234-244), where as the collector used 8-hydrochinon (HQ) (y-S.Kim, J-H.Shin, Y-s.Choi, W.Lee, Y.-I.Lee. Solvent sublation using 8-hydroxyquinoline as ligand for determination of trace elements in water samples // Microchemical Journal, V.68, 2001, P.99-107). The disadvantage of this method is not sufficiently complete removal of metal ions from solutions. There is a method of extraction of iron (III), cobalt (II), Nickel (II), thorium (IV), prolactine (V), uranium (VI) using the method of protectable (Bittner M, Mikilski J. The flotation extraction of Fe (III), Co (II), Ni (II), Th (IV),Pa (V). U (VI) // Nucleonica. 1967. V.12. No. 9. P.599-603)adopted for the prototype. As collectors used surfactants tetradecanamide sodium, dodecylamine hydrochloride, pyridinium bromide. As the organic phase used isooctanol. The process was carried out for 20 minutes. The disadvantage of this method is the inability to sufficiently complete removal of metal cations from solutions. The technical result of the invention is to increase the degree of extraction of cations of europium (III). The technical result is achieved in that in the method of extraction of europium (III) from solutions of salts, including protectrail organic phase and the collector, as the organic phase used isooctyl alcohol, and as a collector of using sodium dodecyl sulphate at a concentration corresponding to the stoichiometry of the reaction: Eu+3+3NaDS=Eu(DS)3+3Na+, where Eu+3- cation of europium (III), LPF - sodium dodecyl sulphate, and the process of photoexcitable carried out at pH 7.5-8.5 and the ratio of organic and aqueous phase 1/20-1/40. Use as a collector of anionic type surfactants sodium dodecyl sulfate provides an increase in the degree of extraction of europium (III) in the process of protectable. Sodium dodecyl sulphate is a transport agent in the process and not the flow rate is changing. In solution, the cations of europium (III) form with sodium dodecyl sulfate stable complexes, which are due to the hydrophobicity of the alkyl radicals are transferred to the organic phase is isooctyl alcohol. Parameter extraction of cations of europium (III) is the distribution coefficient Kp. The value of Kpextracted ion between aqueous and organic phases was calculated by the ratio of the concentration of [Eu+3] in the organic phase to the concentration of [Eu+3] in aqueous solution according to the formula: K=[Eu+3]org/[Eu+3]aq. It is found experimentally that the value of the coefficient of distribution of cations europium (III) between the aqueous and organic phases depends on the solution pH of the aqueous phase. The process of protectable at pH 7.5 to 8.5 also provides an increase in the degree of extraction of cations of europium (III) not less than 98%. The ratio of organic and aqueous phases 1/20-1/40 also provides an increase in the degree of extraction of cations of europium (III) not less than 98% (experimentally obtained). The method is as follows. To aqueous salt solution of europium (III) add collector - surfactants of the anionic type, mix, bring the pH to 7.5 to 8.5. As anionic surfactants of the type used sodium dodecyl sulphate, the concentration of which corresponds to the specified stoichiometry of the reaction. Then we use the t organic phase, which use isooctyl alcohol, in a ratio of organic and aqueous phase 1/20-1/40. Protectrail be performed within 15 minutes After protectable solution to analyze the content of cations of europium (III). The method is illustrated by example. Spend protectrail in the column, made in the form of a cylinder, the bottom of which served as a filter SCHOTT. To 200 ml of nitrate solution of europium (III) concentration of 0.001 mol/l was added anionic type surfactants sodium dodecyl sulphate in an amount corresponding to the concentration of 0.003 mol/L. pH of the aqueous solution was brought to 7.5 to 8.5. The solution was poured into a column was added 10 ml of organic phase isooctyl alcohol and was in the process of protectable within 15 minutes After protectable solution remaining in the column was analyzed for cations of europium (III). Figure 1 presents the dependence of the distribution coefficients of ions of europium (III) of pH of aqueous salt solutions. Figure 2 presents experimental data on photoextract.com cations europium (III) from nitrate solutions of its salts using sodium dodecyl sulfate. The experiment showed that when the value of pH 8.0 extraction of cations of europium (III) from the solution reaches not less than 98%. Thus, the method allows to increase the degree of extraction of europium (III) from a solution of its salts. How WPI is ecene europium (III) from solutions of salts, including protectrail organic phase and a collector, wherein as the organic phase used isooctyl alcohol, and as a collector of used surfactants of the anionic type sodium dodecyl sulphate at a concentration corresponding to the stoichiometry of the reaction:
|