Mineralization at Different Structural Levels in the Crust
Acta Geologica Sinica - English Edition, Volume 99, Issue 4, Page 1042-1058, August 2025.Abstract Metallogenic research on structural levels can reveal vertical patterns of mineralization and facilitate the deep exploration of economic minerals. However, research focusing on the correlation between structural levels and mineralization remains limited.
Saisai LI, Hongrui ZHANG, Zengqian HOU
wiley +1 more source
Caustic fusion of columbite-tantalite concentrates with subsequent separation of niobium and tantalum [PDF]
, 2013 A procedure for the production of spectrographically pure niobium and tantalum oxides from columbite-tantalite concentrates was developed in this study. The procedure involves a caustic fusion process and the separation of tantalum and niobium by liquid ...
Wilhelm, H., Pierret, J.
core
Dissolution kinetics of columbite in nitric acid
, 2012 An investigation of the dissolution kinetics of a Nigerian columbite mineral ore sample in nitric acid media has been undertaken. The effects of acid concentration, process temperature, stirring rate and particle size on the dissolution rate were also ...
Adekola, Folahan A +2 more
core +1 more source
High-temperature and high-pressure study on columbite structured ZnNb2O6
Results in PhysicsHigh-temperature and high-pressure experiments were conducted on columbite-type ZnNb2O6, reaching temperatures up to 873 K at ambient pressure and pressures up to 30 GPa at ambient temperature, respectively.
A. Tyagi +8 more
doaj +1 more source
Columbite Crystal (1 x 3/4 ) in Quartz
, 1994 Columbite Crystal (1 x 3/4 ) in Quartzhttps://digitalmaine.com/mgs_geologic_field_photos/6910/thumbnail ...
Poisson, John
core
Processing of a Nigerian columbite-rich ilmenite ore for improved industrial application by sulphuric acid solution [PDF]
, 2018 Due to increasing technological advancements, the demand for pure niobium products emanated from columbite ore processing has led to the wide array of its application in capacitors, nuclear uses, superconducting RF cavities, an electromagnetic radiation ...
Adeola O. Womiloju +13 more
core +1 more source
Crystal-chemical and genetic controls of U-Pb systematics of columbite-tantalite
, 1996 Columbite-tantalite can accommodate considerable amounts of uranium and excludes lead almost completely. It is thus potentially suited for U-Pb elating. Discordias generally yield closely constrained upper intercept ages.
Smeds, SA,, Cerny, P,, Romer, RL,
core +2 more sources
Synthesis, Structural, and Magnetic Properties of High-Entropy (Fe0.2Co0.2Cu0.2Ni0.2Mn0.2)Nb2O6
MagnetochemistryIn this work, we present the first report on the synthesis via the sol–gel method of a high-entropy (Fe0.2Co0.2Cu0.2Ni0.2Mn0.2)Nb2O6 with columbite–orthorhombic structure. Polyvinylpyrrolidone (PVP), ammonium niobium oxalate, and equimolar amounts of Fe,
Maria J. S. Lima +5 more
doaj +1 more source
Leaching of a Nigerian Columbite in Hydrochloric Acid: Dissolution Kinetics
, 2012 This paper presents the kinetics of dissolution of a Nigerian columbite mineral ore sample in hydrochloric acid media. The effects of acid concentration, process temperature, stirring rate and particle size on the dissolution rate were examined ...
Adekola, Folahan A +1 more
core +1 more source
Metallographic and in situ compositional study on columbite–tantalite mining concentrates from placers at Maçainhas (Central-East Portugal): insights for tantalum exploration [PDF]
, 2017 Purpose In the middle part of 20th century, the Portuguese Gaia-Ma double dagger ainhas Sn-Ti-Ta placers were important tin and tantalum producers in Europe.
Joana Fernandes +3 more
core +1 more source