The sorption of selenite (Se(IV)) at trace (sub-ppm) to high concentrations on periclase (MgO) under high-pH conditions (pH > 10) was examined by macroscopic sorption experiments and nanoscale solid phase analyses via transmission electron microscopy and X-ray absorption spectroscopy. The maximu...

The interactions between nanoparticles (NPs) and metals in aquatic environments may modify the bioavailability and toxicity of metals to organisms. In this study, we investigated the effects of titanium dioxide NPs (n-TiO2) on the bioconcentration, depuration, and neurotoxic effects of lead (Pb)...

Development of the cities is facing many problems; one of them is runoff water pollution. On the other hand, some technologies have been applied to remove water pollution such as the photocatalytic effect method using nano-titanium dioxide (nTiO2). That technology exhibited a significant effect ...

The adsorption of cyanide ions (CN−) on pyrite, marcasite and pyrrhotite surfaces was studied using density functional theory. The depressing effects of CN− on these three minerals were then investigated by flotation tests. The calculated results show that the adsorption energy of CN− on the mar...

Pyrite is an attractive material as its good photovoltaic performance; however, the presence of marcasite phase is considered to be detrimental to pyrite as a photovoltaic material due to its low band gap. Density functional theory (DFT) combined with Hubbard U correction was used to perform the...

The structural and electro-optical influence of marcasite on the properties of solution-processed iron pyrite thin films was investigated. Marcasite has a strong tendency to form simultaneously with pyrite upon sulfurization of amorphous iron-oxide precursor films, leading to a mixed-phase struc...

Mechanical activation in order to improve lithium recovery from a lepidolite ore concentrate was investigated. The concentrate was mechanically activated using different milling times and the effect on the resulting products was evaluated by X-ray powder diffraction, FTIR spectroscopy, TG-DTG an...

Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, and many of the related phyllosilicate mineral of the mica group have been well studied from the chemical and structural point of view; however, to the best of our knowledge, studies on their luminescence properties have been scarcely reported. This work ...

Lithium extraction from hard-rock ores has regained importance due to the increased demand for this metal to supply the growing battery market. Therefore, several studies have been focused on the lithium extraction from ores, however, leaching and purification steps are sparsely studied. Thus, t...

Lepidolite has recently become valued as an important lithium ore resource due to the rapidly increasing demand for lithium (Li) for lithium-ion batteries (LIBs). However, existing processes to extract Li from lepidolite are still difficult and uneconomical, since the amount of lithium contained...

The lepidolite located in Yichun, Jiangxi Province, China, was adopted to investigate the recovery of alkali metals and leaching kinetics of lithium with sulphuric acid solution under atmospheric pressure. The results show that the recoveries of alkali metals were achieved under the leaching con...

In-situ capturing of fluorine (F) with CaO in a fluidized bed reactor is proposed to accelerate the defluorination reaction and to improve the lithium extraction from lepidolite ore. Compared to the roasting process without addition of CaO, the Li extraction efficiency is improved by ca. 15 perc...

The treatment of lepidolite by a multistage leaching process was studied for the extraction of alkali metals as alkali alums and brines. The precipitation characteristics of the aluminum and fluorine in the solution were also investigated. The transformation of the mineralogical species in lepid...

In this work, fine magnetite was used as a magnetic seed to enhance the separation efficiency of fine hematite from quartz during reverse micro-flotation. Gradual increases in hematite recovery and iron grade were accomplished with increasing magnetite content, whereas the iron content in quartz...

The depression of hematite in the reverse flotation system of oleate-starch-hematite was investigated at the atomic level by atomic force microscopy (AFM) combined with density functional theory (DFT). AFM imaging and cross-sectional imaging show that the adsorption configurations of oleate and ...

Glauconite occurs either as unaltered greenish or as altered brownish variety in Upper Cretaceous-Palaeocene sediments in the southeastern corner of Western Siberia. Studied section within the Bakchar iron-ore deposit includes Ipatovo, Slavgorod, Gan'kino and Lyulinvor formations, which are...

This study presents geochemical characteristics of glauconites in estuarine deposits within the Maastrichtian Lameta Formation in central India. Resting conformably over the Bagh Group, the Lameta Formation consists of ∼4–5 m thick arenaceous, argillaceous and calcareous green sandstones under...

Mineralogical and geochemical studies were carried out on Upper Cretaceous (Cenomanian – Maastrichtian) glauconites from Egypt by means of polarizing microscope, XRD, SEM, microprobe and XRF techniques. Most of the investigated glauconite grains display zoning-like appearance. X-ray diffraction...

Rare earth element (REE) analyses are reported on glauconite-bearing phosphorites from northeastern Algeria. These rocks of Paleocene-Eocene age are located in the Eastern part of the Saharan Atlas, where two localities were investigated: the Djebel El Kouif in the north and the Kef Essenoun in ...

The Demerara Plateau is a marginal plateau which forms a bathymetric relief on the sea floor. Here, contourite deposits have been studied in detail, following the recent discovery of contourite sequences likely related to the bottom currents and linked both to contour current and peculiar sea-fl...