V. G. Maiorov

Extraction of thorium with tributyl phosphate from chloride solutions

Thorium distribution was studied in relation to concentration of Th, HCl, and metal chloride in aqueous solutions, the nature of the diluent, and the tributyl phosphate concentration in the extractant. Thorium extraction from salt solutions increases in the order NaCl < CaCl2 < AlCl3. The fact that introduction of up to 30% of benzene or dodecane into tributyl phosphate has virtually no effect on the Th extraction is important for industrial application. The results obtained are discussed.

Extraction Recovery of Tantalum(V) and Niobium(V) from Hydrofluoric and Hydrofluoric-Sulfuric Acid Aqueous Solutions with Octanol

Comparative study of extraction of tantalum(V) and niobium(V) with octanol and tributyl phosphate was made. The data on distribution of tantalum(V) and niobium(V) between octanol and hydrofluoric and hydrofluoric-sulfuric acid aqueous solutions were obtained. The flowsheet for preparation of pure tantalum and niobium oxides was developed.

Extraction of tantalum, niobium, and antimony fluorides

This report deals with the effects of the HF and H2SO4 concentrations and the organic-to-aqueous phase ratio Vorg: Vaq on the distribution of Ta, Nb, and Sb in their extraction with tributyl phosphate and n-octanol from model solutions that are similar in composition to those obtained in columbite-tantalite processing. The recovery of these elements decreases in the order Ta ≫ Sb ≥ Nb. Process conditions for efficient separation of Ta from Nb and Sb have been found.

Extraction of Tantalum(V) Impurities from Niobium(V) Fluoride Solutions with Octanol

Fine purification of niobium(V) to remove tantalum(V) by extraction was studied at various compositions of solutions and ratios of phase volumes. Washing of tantalum(V) and niobium(V) extracts with aqueous solutions of their fluorides was considered.

Extraction of Th(IV) with tributyl phosphate from aqueous HCl solutions containing sodium, calcium, or aluminum chloride

Extraction of thorium(IV) from 0.1–3 M aqueous hydrochloric acid solutions containing NaCl, CaCl2, or AlCl3 was studied. The experimental results are discussed.

Extractive Recovery of Tantalum(V) and Niobium(V) with Octanol from Hydrofluoric Acid Solutions Containing Large Amounts of Titanium(IV)

Extractive recovery with n-octanol of tantalum(V) and niobium(V) from hydrofluoric acid solutions containing large amounts of titanium (up to 2-3 M) was studied. The conditions were found for separation of tantalum(V) and niobium(V) from titanium(IV), allowing recovery of 95.7 and 84.1% of tantalum and niobium fluoride complexes, respectively, in one extraction cycle, with 2.6% recovery of titanium.

Preparation of alkaline solutions of niobium(V)

Alkaline niobium(V) solutions containing up to 190 g l−1 of niobium oxide were prepared by sintering niobium(V) oxide with potassium carbonate and following leaching of the sinters with water.

Preparation of concentrated alkali solutions of niobium

Concentrated alkali solutions of niobium containing up to 238 g/L of Nb2O5 have been obtained by sintering of Nb2O5 with K2CO3 · 1.5 H2O. These solutions are recommended for use in the production of welding and other functional materials.

Extraction of phosphorus(V), molybdenum(VI), and tungsten(VI) from fluoride solutions

The influence of titanim(IV) and silicon(IV) on the extraction of phosphorus(V), molybdenum (VI), and tungsten(VI) fluoride complexes by tributyl phosphate was studied.

Utilization of waste solutions in perovskite technology

A scheme for utilization of chloride solutions of complex composition with α-and β-activity of up to 35 and 28 kBq 1−1, respectively, is suggested.