Results 51 to 60 of about 2,095 (190)

Using an economic method to prepare TiO2 from natural ilmenite for photodegradable dye removal

Results in Chemistry
In this work, nanoparticles of ilmenite powder (47 nm) were prepared via ball-milling of natural ilmenite ore to enhance the specific surface area of particles. The photocatalytic activity of magnetically separable ilmenite nanoparticles was investigated
Maryam Ehsani Besheli, Mahdi Heidari-Golafzani, Tohid Mohammadi, Rahmatollah Rahimi   +3 more
doaj   +1 more source

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

UV–Vis–NIR Reflectance Spectra of Ilmenite Mixtures: Implications for Estimation of TiO2 Content in Lunar Mare Regions

The Planetary Science Journal
We performed spectral measurements on mixtures of ilmenite powder (
Moe Matsuoka, Satoru Yamamoto
doaj   +1 more source

Certified Reference Materials Preparation of Ilmenite Chemical Composition

Yankuang ceshi, 2014
At present, there are no ilmenite chemical composition certified reference materials, the closest being of vanadium-titanium magnetite ore composition.
HONG Fei, LIU Yao-hua, LV Zhen-sheng, ZHAO Wei, WANG Qing, ZHANG Ying-ming   +5 more
doaj   +2 more sources

Isothermal and Kinetic Studies on Oxidation Roasting of Kahnooj Ilmenite Concentrate

Chemical Engineering Transactions, 2018
In this study, the effect of oxidation conditions, specifically reaction time, temperature and ilmenite particle size for Kahnooj ilmenite concentrate were investigated.
Hossein Salehi, Hossein Aghajani, Hamed Salimkhani   +2 more
doaj   +1 more source

A Comparative Study of Different Machine Learning Algorithms in Predicting the Content of Ilmenite in Titanium Placer

Applied Sciences, 2020
In this study, the ilmenite content in beach placer sand was estimated using seven soft computing techniques, namely random forest (RF), artificial neural network (ANN), k-nearest neighbors (kNN), cubist, support vector machine (SVM), stochastic gradient
Yingli LV, Qui-Thao Le, Hoang-Bac Bui, Xuan-Nam Bui, Hoang Nguyen, Trung Nguyen-Thoi, Jie Dou, Xuan Song   +7 more
doaj   +1 more source

TITANOMAGNETITE ORES: MINERAL COMPOSITION AND MÖSSBAUER SPECTROSCOPY [PDF]

Минералогия, 2017
Chemical and mineral composition of ilmenite-titanomagnetite ores from Chiney, Sludinsky, Bystrinsky and Kruchininsky deposits (East Siberia) are studied and compared with those from the Panzhihua pluton in China using microprobe and X-ray diffraction ...
V.P. Lyutoev, B.I. Gongalsky, A.B. Makeyev, A.Yu. Lysyuk, L.O. Magazina, V.I. Taskaev   +5 more
doaj  

Progressively Fenitised Schist and Carbonatitic Clasts From a Metasomatic Aureole Beneath the Alkalic Dunedin Volcano, Otago, New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
Clasts of albite‐porphyroblastic quartzofeldspathic schist, derived from the Otago Schist basement, occur within the Port Chalmers Breccia, a diatreme at the centre of the Dunedin stratovolcano, New Zealand. Schists have undergone varying degrees of replacement reactions (at temperatures of 300° to >500°C) producing hornfelses, with Ca‐ and K‐enriched ...
Alan F. Cooper
wiley   +1 more source

New Magnetite Reference Material for SIMS δ18O Measurements and a Study of Precision and Accuracy Due to Crystal Orientation Effects

Geostandards and Geoanalytical Research, Volume 50, Issue 2, Page 391-406, June 2026.
Key Points A new magnetite reference material (PF21mt) is available for δ18O measurements by SIMS. Reproducibility of measurement results in two laboratories suggest orientation bias of ±2‰ (2s) at 20 keV. Repeatability improves to ±1‰ (2s) when using a 13 keV protocol, suggesting reduced orientation bias. In situ isotope ratio measurements provide the
Michelle Ulrich, Daniela Rubatto, Maria Rosa Scicchitano, Benita Putlitz, Thomas Bovay   +4 more
wiley   +1 more source

Cryptic Paleomagnetic Complexity in the Ediacaran Egersund Dikes

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract The Ediacaran Period (∼635–539 Ma) represents a critical interval in Earth's evolution, yet its paleomagnetic record remains complex and contentious. One of the few Ediacaran paleomagnetic results from Baltica considered robust is a pole from the ca.
Yi Xue, Mathew Domeier, Petter Silkoset, Leandro C. Gallo, Justin A. D. Tonti‐Filippini, Harald J. Walderhaug   +5 more
wiley   +1 more source