V. I. Ivanenko

Sorption of rare earth elements of waste solution of leaching uranium

The possibility of sorption recovery of rare earth elements from the waste sulfate solutions of uranium leaching, which contain a few tens of milligrams per liter of the rare earth elements, up to 1 g L−1 of aluminum, and 2 g L−1 of iron, with using a carboxyl sorbent CYBBER LX 280, hydrated titanyl hydrogen phosphate and its analogue modified with zirconium(IV). It was shown that 95% of the rare earth elements and more can be recovered by neutralizing the solution by sodium hydroxide to pH ≈ 4.2, separating the resulting precipitate based on iron hydroxide, and subsequent sorption at the CYBBER LX 280 sorbent.

Potentiometric Study of Reactions of Titanium Complexes in Phosphate–Perchlorate Acid Solutions

AbstractThe potentiometric method is used to measure the equilibrium potential in the Ti(IV)/Ti(III) system and determine that monophosphate Ti(IV) complexes and Ti3+hydrated complexes dominate in phosphate–perchlorate acid solutions, 4M(H, Na)ClO4, at

Sorption extraction of lanthanides from phosphoric acid solutions

c_{{\text{H}}_{\text{3}} {\text{PO}}_{\text{4}} }

Physicochemical Reasons for the Use of TiOHPO4 for Treatment of Liquid Radioactive Waste

of 5 × 10–2to 4 × 10–1M. Equations that describe the total electrode reaction are proposed. Decreasing the concentration of free hydrogen ions from 3 to 0.12 M results in the deprotonation of TiO(H2PO4)+complexes and the formation of TiO(HPO4) complexes. Equilibrium constants for reactions of the formation of Ti(IV) monophosphate complexes and the protonation of TiO(HPO4) complex are calculated.

Preparation of the Li1.5Al0.5Ge1.5(PO4)3 solid electrolyte with high ionic conductivity

The process for producing the electrode material LiCoPO4 modified by the lithium-conducting solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP) was studied. To create a composite consisting of an electrochemically active substance and an electrically conductive additive distributed uniformly between LiCoPO4 particles, a peroxide solution of a LATP precursor was used. After annealing at 700°C, the two-phase composite LiCoPO4/LATP was obtained, the conductivity of which was two orders of magnitude higher than that of binary lithium cobalt phosphate at room temperature.

Study of Li 4 Ti 5 O 12 interaction with solid lithium-containing electrolytes

The possibility of sorption extraction of lanthanides from nitric-phosphoric and phosphoric acid solutions with inorganic sorbents based on hydrated titanyl hydrophosphate was studied. New technological solutions were suggested for lanthanide sorption from the products which are formed in processing of the Khibiny apatite concentrate on mineral fertilizers (frozen nitric-phosphoric acid extract, a product of nitric acid decomposition of apatite, and the production phosphoric acid from the dihydrate process).

Thermodynamics of cationic substitutions on titanyl hydrogen phosphate

Effect of the degree of hydration and the phosphorus to titanium ratio in sorbents based on hydrated oxotitanium hydrophosphate on their sorption properties: constant of heterogeneous substitution of hydrogen ions by cations of sodium, cesium, and strontium and static exchange capacity, was studied.

Synthesis of micro-and nanocrystalline powders of alkali metaniobates and metatantalates

Heterogeneous exchange of the proton of hydrated titanyl hydrogen phosphate with Li, Na, K, Rb, and Cs cations in aqueous solutions was studied potentiometrically. The sorption equations were proposed. The concentration and thermodynamic equilibrium constants were calculated. The optimal pH range of the solution providing effective sorption of radioactive cesium on hydrated titanyl hydrogen phosphate was determined. The decrease in the efficiency of radiocesium sorption from liquid waste with a high content of competing nonradioactive alkali metal cations is due to a decrease in the pH of this solution in the course of the sorption. To provide efficient sorption removal of radiocesium, the pH should be maintained in the range 4-7, or the sodium form of the sorbent should be used. The selectivity of radiocesium sorption on TiOHPO4 in the presence of excess sodium cation was estimated.