Zobrazeno 1 - 10
of 20
pro vyhledávání: '"V. K. Kopkov"'
Publikováno v:
Theoretical Foundations of Chemical Engineering. 50:547-553
The conditions of tantalite (Congo deposit) and the decomposition of columbite (Zashikhinsk deposit) using an HF and H2SO4 mixture when heated to 80°C have been found. The extraction of Ta and Nb into solutions achieved levels of more than 99% and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8bb566ee3090e1292133c0b348cef50
https://doi.org/10.1134/s0040579516040175
https://doi.org/10.1134/s0040579516040175
Autor:
Sergey V. Krivovichev, Elena S. Zhitova, V. K. Kopkov, V. G. Maiorov, M. P. Rys’kina, A. I. Nikolaev
Publikováno v:
Russian Journal of Inorganic Chemistry. 59:172-177
The effects of KOH and K2CO3 concentrations in the solution and temperature on the solubilities of K7[HNb6O19] · 10H2O and K8 [Nb6O19] · 16H2O are studied. The structure of K7[HNb6O19] · 13H2O is established.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89ad2bd23f3beda8beb33f90f0403c9c
https://doi.org/10.1134/s0036023614030152
https://doi.org/10.1134/s0036023614030152
Publikováno v:
Russian Journal of Applied Chemistry. 86:108-111
Leaching with water of products obtained by sintering of Nb2O5 with K2CO3·1.5H2O, KHCO3, and KOH was studied. Solutions containing up to 500 g l−1Nb2O5 were obtained. These solutions can be recommended for use in production of welding and other fu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c55697bc66a8611c57fa7e3fd2017e5
https://doi.org/10.1134/s1070427213010199
https://doi.org/10.1134/s1070427213010199
Autor:
V. K. Kopkov, N. L. Mikhailova, O. A. Zalkind, G. I. Kadyrova, V. G. Maiorov, V. Ya. Kuznetsov, A. I. Nikolaev
Publikováno v:
Russian Journal of Applied Chemistry. 85:1820-1826
Solutions containing 500 g L−1 Nb2O5 were obtained by sintering Nb2O5 with potash followed by leaching with water. The potassium niobate released from niobium(V) alkaline solutions was examined with an application of methods of physical and chemica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::164f48b4a808a2f257275be849d64691
https://doi.org/10.1134/s1070427212120051
https://doi.org/10.1134/s1070427212120051
Publikováno v:
Theoretical Foundations of Chemical Engineering. 46:563-566
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.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c02002dfcd0a5bf579ed8c7c9abf67f
https://doi.org/10.1134/s0040579512050065
https://doi.org/10.1134/s0040579512050065
Publikováno v:
Russian Journal of Applied Chemistry. 84:1694-1697
Sintering of columbite and tantalite with K2CO3·1.5H2O with subsequent leaching of the sinters with water was studied. The possibility of selective extraction of Nb(V) and Ta(V) into liquid phase was demonstrated.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::779b7c8bb8802dce4f97a05c8c82a770
https://doi.org/10.1134/s107042721110003x
https://doi.org/10.1134/s107042721110003x
Publikováno v:
Russian Journal of Applied Chemistry. 84:1137-1140
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.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::85f2c6e242bb057cc649bce67785d484
https://doi.org/10.1134/s1070427211070020
https://doi.org/10.1134/s1070427211070020
Publikováno v:
Russian Journal of Applied Chemistry. 82:911-914
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.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b15b11de97910cfe04fc2d8a6032308a
https://doi.org/10.1134/s1070427209050310
https://doi.org/10.1134/s1070427209050310
Publikováno v:
Russian Journal of Applied Chemistry. 80:2020-2023
Leaching of vanadium(IV, V) with water and a NaOH solution from ash produced in black oil combustion was studied.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a68ef4f3e2438118ed8be197be1b8ce
https://doi.org/10.1134/s1070427207120029
https://doi.org/10.1134/s1070427207120029
Publikováno v:
Russian Journal of Applied Chemistry. 78:1566-1570
Recovery of thorium(IV) and radium(II) by precipitation methods in the chloride technology of perovskite processing was studied.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cdf58c3ebfd91832ed45292dfb23c8eb
https://doi.org/10.1007/s11167-005-0562-y
https://doi.org/10.1007/s11167-005-0562-y