Исследована сорбция комплексных ионов иттрия с Трилоном Б на слабоосновном анионите D-403 в нитратной форме из кислых сред со значением рН 3 при постоянной ионной силе (NaNO3, 1 моль/кг). Термодинамическое описание изотермы сорбции анионных комплексов иттрия проведено методом, основанным на линеаризации уравнения закона действующих масс, модифицированного для реакций ионного обмена. Рассчитаны значения константы ионного обмена, энергии Гиббса ионного обмена, емкости анионита и предельной сорбции этилендиаминтетраацетатоиттрат-иона (ЭДТА-иттрат-ион). С использованием фронтального варианта ионообменной хроматографии проведено разделение церия и иттрия на анионите D-403 с долей чистого иттрия на выходе из колонки не менее 30%.

A mechanism of extraction of cerium by tributyl phosphate (TBP) from phosphate solutions using model and production solutions containing, %: 26–28 P 2 O 5 , 1.2–2.8 SO 3 , 0.3–0.8 CaO, 0.1–0.4 Al 2 O 3 , 0.3–0.4 Fe 2 O 3 , and 0.09–0.1 REE(NO 3 ) 3 is investigated. The model solution of phosphoric acid corresponds to the industrial solution of extraction phosphoric acid (EPA) by the content of P 2 O 5 and Ce(NO 3 ) 3 and value of pH (0.6). Dependences of extraction parameters on the TBP concentration in o-xylene and concentration of nitrate ions introduced by magnesium and calcium nitrates, which are used as a salting-out agent, are found. The composition of the extracted organic complex of cerium Ce(H 2 PO 4 )(NO 3 ) 2 TBP org is determined. A constant of extraction equilibrium and the Gibbs energy of extraction are calculated. It is concluded by the results of the experiment that it is unreasonable to use TBP to extract Ce from phosphoric acid systems without introducing a considerable amount of the salting-out agent.

Gallium sorption from alkaline solutions over various weak- and strong-basic anion-exchange resins under the dynamic conditions has been studied. The values of dynamic exchange capacity before breakthrough and full dynamic exchange capacity have been calculated. D-403 selective anion exchange resin has been selected. The gallate-ion sorption isotherm over D-403 weak-basic anion-exchange resin is described by Langmuir equation modified for ion-exchange equilibrium and the thermo-dynamic sorption parameters are determined. A method for determining gallium forms in alkaline solution is proposed. A series of anion sorption ability on the solid phase surface of D-403 anion exchange resin is presented.

The sorption of complex yttrium ions with Trilon B onto the weakly basic anionite D-403 in nitrate form from an acidic medium at pH 3 with constant ionic strength (NaNO3, 1 mol/kg) is investigated. A thermodynamic evaluation of the sorption isotherm of anionic yttrium complexes is performed using a method based on the linearization of the equation of the law of active mass, modified for ionic exchange reactions. The ionic exchange constant, the Gibbs free energy of ionic exchange, the capacity of the anionite, and the sorption limit of ethylenediaminetetraacetatoyttrate ions (EDTA yttrate ions) are calculated. Using a frontal version of ion exchange chromatography, cerium and yttrium are separated on D-403 anionite with a fraction of pure yttrium at the column outlet of no less than 30%.

Experimental data on solvent extraction of lanthanum (III) and samarium (III) by solutions of naphthenic acid from nitrate medium was obtained. Dependences of distribution coefficient of pH, concentration of organic and aqueous phase was obtained. thermodynamic characteristics of extraction equilibrium was calculated.

Technology of solvent extraction and separation of cerium lanthanides by solutions of naphthenic acid in o-dimethylbenzene was obtained. The sequence of extraction Eu > Sm > Ce > La from nitrate media was calculated.

The sorption of gallium from alkali solutions on various weakly and strongly basic anionites is studied in dynamic conditions, and the breakthrough dynamic exchange capacity and complete exchange dynamic capacity are investigated. The D-403 selective anionite is selected. The sorption isotherm of gallate ions on the D-403 weakly basic anionites is described by the Langmuir equation modified for the ionexchange equilibrium and the thermodynamic parameters of the sorption are determined. The method of evaluating the form of situating gallium in the alkali sodium solution is suggested. The sorption ability series of the anions on the surface of the solid phase of the D-403 anionite is presented.

Technology of solvent extraction and separation of cerium lanthanides by solutions of naphthenic acid in o-dimethylbenzene was obtained. The sequence of extraction Eu > Sm > Ce > La from nitrate media was calculated.

Sorption isotherms was obtained in the form sulfate complex of cerium on the anion exchanger D-403 at a temperature of 298 K and pH = 2 divided by 4 in the presence of various concentrations of magnesium sulfate. Thermodynamic description of the sorption isotherm sulfate complexes of cerium by the method, which based on linearization of the equations of the law of mass action modifed for the reaction of ion exchange. The values of the apparent constants of ion exchange and differential Gibbs energy calculated for the ions of. Ce(SO4)(2)(-).

Experimental data on solvent extraction of lanthanum (III) and samarium (III) by solutions of naphthenic acid from nitrate medium was obtained. Dependences of distribution coefficient of pH, concentration of organic and aqueous phase was obtained. thermodynamic characteristics of extraction equilibrium was calculated.

The kinetics parameters of phenol oxidation by MnO2 on the surface of iron-manganese nodules at pH = 5,5±0,5 at temperature region from 293 till 353 K was described in this paper. The oxidation reaction runs by second order on phenol. At temperature region from 293 till 353 K the limited stage is chemical reaction. The activation energy of oxidation on the surface of iron-manganese nodules is equal 6,65 kJ/mol, and it is less than it’s one for oxidation on MnO2 surface (42,0 kJ/mol). The oxidation products are hydrohinon and less than 10 pier. % p-benzohinon.

The kinetics parameters of phenol oxidation by MnO2 on the surface of iron-manganese nodules at pH = 5,5 +/- 0,5 at temperature region from 293 till 353 K was described in this paper. The oxidation reaction runs by second order on phenol. At temperature region from 293 till 353 K the limited stage is chemical reaction. The activation energy of oxidation on the surface of iron-manganese nodules is equal 6,65 kJ/mol, and it is less than it's one for oxidation on MnO2 surface (42,0 kJ/mol). The oxidation products are hydrohinon and less than 10 pier. % p-benzohinon.

Extraction in a system sodium dodecyl sulfate-aqueous solution of a lanthanide salt-isooctyl alcohol was examined in the study. It was found that a distribution ratio was varied from 120 to 480 in a pH range of 3–6. Gibbs energy of solvation was determined: Δ s G°298 = −70.00 ± 1.30 kJ mol−1.

Установлено, что окисление гексацианоферрата(III) калия при рН 7–11 протекает по реакции псевдовторого порядка с константами скорости 2.93, 4.19, 6.16, 8.66, 9.22 л/(моль мин) при температурах 313, 323, 333, 343 и 353 К соответственно. Показано, что энергия активации реакции составляет 27.82 кДж/моль. Отмечено, что второй порядок реакции, а также независимость константы скорости от соотношения объема жидкой фазы к массе твердой и числа оборотов мешалки, позволяют предположить протекание реакции в кинетической области с переходом в диффузионно-кинетический режим при 353 К.

Isotherms of the sorption of cerium in the form of a sulfate complex onto D-403 anionite at a temperature of 298 K and pH values from 2 to 4 in the presence of magnesium sulfate of different concentrations are obtained. The thermodynamic description of the sorption isotherm of cerium sulfate complexes is verified by linearization of the mass action law, modified for ion exchange reactions. The values of the apparent ion exchange constant and differential Gibbs energy for Ce(SO 4 ) 2 − ions are calculated.

Исследована сорбция церия в виде комплексов c Трилоном Б из кислых сред при значении рН 3 с использованием слабоосновного анионита D-403 в нитратной, хлоридной или сульфатной формах. Для реакций ионного обмена проведена линеаризация уравнения закона действующих масс, что позволило рассчитать значения предельной сорбции этилендиаминтетраацетатцеррат-ионов (ЭДТАцеррат-ионов) на анионите, значения констант ионного обмена комплексных ионов церия на хлорид-, нитрат- и сульфат ионы. Установлено, что значение предельной сорбции ЭДТАцеррат-ионов в фазе анионита, переведенного в сульфатные формы, ниже предельной сорбции ионов на анионите в нитратной форме или хлоридной формах, что объясняется высоким значением ионного потенциала сульфат-ионов. По значению энергии Гиббса ионообменного равновесия представлен ряд сорбируемости ЭДТАцеррат-ионов на анионите D-403 в различных ионообменных формах.

Получены изотермы сорбции церия в виде сульфатного комплекса на анионите D-403 при температуре 298 К и значениях рН 2–4 в присутствии сульфата магния различной концентрации. Термодинамическое описание изотермы сорбции сульфатных комплексов церия проведено методом, основанным на линеаризации уравнения закона действующих масс, модифицированного для реакции ионного обмена. Рассчитаны значения кажущейся константы ионного обмена и дифференциальной энергии Гиббса для ионов Ce(SO4) .

It is established that the oxidation of potassium ferricyanide at pH 7–11 proceeds as a pseudo-second-order reaction with rate constants of 2.93, 4.19, 6.16, 8.66, and 9.22 L/(mol min) at 313, 323, 333, 343, and 353 K, respectively. The activation energy of the reaction is found to be 27.82 kJ/mol. The second order of the reaction, as along with the non-dependence of the rate constant on the liquid-phase volume: solidphase weight ratio, and on the rotation speed of the mixer, allow us to assume that the reaction proceeds in the kinetic region with a transition to the diffusion-kinetic mode at 353 K.

The information about life time of famous chemist and metallurgist N.S.Kurnakov and the capsule review of his scientific achievementsis represented in this paper. The formation of chemical and metallurgical scientific school in Saint Petersburg Mining Institute is shown.

Sorption of cerium in the form of complexes with Trilon B (EDTA) from acid media at pH 3 using weakly basic anionite D-403 in nitrate, chloride, or sulfate forms is studied. The equation of the mass action law is linearized for ion exchange reactions, allowing us to calculate the limiting sorption of ethylenediaminetetraacetate cerate (EDTA cerate) ions on anionite and the constants of the exchange of complex cerium ions by chloride, nitrate, and sulfate ions. The limiting sorption of EDTA cerate ions in the anionite phase transitioning to the sulfate form is lower than that of ions on nitrate or chloride anionite, due to the high ionic potential of the sulfate ions. A sorption series of EDTA cerate ions on anionite D-403 in different ion exchange forms is presented according to the Gibbs energy of the ion exchange equilibrium.