Removal of chromium (VI) from aqueous solution …
chromium-containing compounds, such as pigments, paints, catalysts, chromic acid, and tanning agents [1]. Chromium occurs in the environment commonly as Cr (III) and Cr (VI) oxidation states, which have quite different chemical properties. Cr (VI) can be transformed to Cr (III) and vice versa depending on pH, the presence of oxidizing and …
Chromium biogeochemical cycling in basalt-derived …
Basalt-derived paddy soils contain high Cr concentrations (up to 429 mg/kg). •. Available Cr increased under anoxic phase but decreased under oxic phase. •. Cr …
A literature review on leaching and recovery of vanadium
Stepwise sodium roasting-water leaching technology [ 25] was applied to recover vanadium and chromium from high-chromium vanadium slag. About 87.9% of the vanadium could leach out at first step of Na 2 CO 3 -roasting-water-leaching at roasting temperature of 800 ℃ for 120 min.
The mean composition of ocean ridge basalts
"ALL MORB" is the total composition of the crust apart from back-arc basins, N-MORB the most likely basalt composition encountered along the ridge >500 km from hot spots, and D-MORB the depleted end-member. ALL MORB and N-MORB are substantially more enriched than early estimates of normal ridge basalts. The mean composition of …
Chromium transformation driven by iron redox cycling in basalt …
Introduction. Chromium (Cr) in trivalent (Cr(III)) and hexavalent (Cr(VI)) states showed significantly distinct characteristics in the soil system (Shahid et al., 2017).The mobility of Cr(VI) is relatively high in soils, whereas the Cr(III) is easily adsorbed and further immobilized (Stewart et al., 2003; Yang et al., 2019).In regards to …
Enrichment and speciation of chromium during basalt …
Basalt-derived soils are widespread worldwide. Such soils contain high levels of heavy metals like chromium (Cr), which is a serious environmental concern. However, little is known regarding the enrichment and speciation of Cr during the basalt weathering process. Therefore, two basalt-derived soil …
Platinum-bearing chromite layers are caused by …
We show that basaltic melts located adjacent to a so-called chromite topological trough in deep-seated reservoirs become saturated in chromite alone upon …
Sustainability | Free Full-Text | Reduction of High …
In addition, the chromium sludge resulting from the treatment process, after calcination, was tested in a ceramic glaze as a pigment and, when compared with an industrial pigment, showed similar …
Recovery of chromium by calcium-roasting, …
The Cr (III) was oxidized into water-soluble Na2CrO4. And then leached at 25 °C for 20 min with the liquid-to-solid of 3:1 mL/g, nearly 96.4% chromium was leached out. In order to …
Basalt | Properties, Formation, Composition, Uses
Basalt is a dark-colored, dense rock composed primarily of plagioclase feldspar and pyroxene. It is the most common rock type found in oceanic crust and is an important component of the Earth's continental crust. Basalt is formed through the rapid cooling and solidification of magma at Earth's surface, resulting in the formation of lava ...
Application of integrated local plant species and vesicular basalt …
Chromium is a grey, hard metal mostly found in the trivalent and hexavalent oxidation states in nature. The sources of Cr are from geogenic and anthropogenic sources. ... Vesicular basalt rock (15−20 mm) was used to fill the constructed units that helped to vegetate the local plants on it. 2.3. Pilot scale constructed wetland units.
chromium in basalt stone
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Will Chromium Leach From Basalt
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Reduced chromium in olivine grains from lunar basalt …
Reduced chromium in olivine grains from lunar basalt 15555: X-ray Absorption Near Edge Structure (XANES) Author links open overlay panel S.R Sutton 1 2, ... Chromium in olivine has been particularly intriguing since lunar olivines are enriched in Cr compared with ter- restrial olivines (STEELE and SMITH, 1975; SMITH and …
The Ability of Basalt to Leach Nutrients and Support Growth …
ABSTRACT The influence of different rock mineralogical compositions on element leaching and bio-weathering processes is poorly understood. Here, the role of basalt composition on nutrient leaching (calcium, iron, phosphorus or magnesium) and subsequent support of Cupriavidus metallidurans CH34 growth was evaluated. Seven …
[PDF] Adsorption of chromium (III) from aqueous solution …
Abstract Chromium (III) is one of the chemicals widely used in various industrial processes. The wastewater containing Chromium (III) can be interconverted to Cr (VI) in the environment, which is one of the most toxic chemicals to biological systems. This paper investigates the removal of chromium (III) from aqueous solutions by adsorption …
Chromium biogeochemical cycling in basalt-derived paddy …
The chemical weathering of basalt is a vital source of Cr in agricultural fields (Gloaguen and Passe, 2017). Basalt principally comprises primary mafic silicate minerals such as pyroxene, olivine, and hornblende, which are easily weathered and contain high Cr concentrations (Gislason et al., 2009). Such basalt-derived paddy soils are widespread ...
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Enrichment and speciation of chromium during …
Results showed that Cr concentrations in the saprolites (234 to 315 mg·kg -1) were higher than those in basalt rocks (139 to 159 mg·kg -1 ), indicating that Cr was …
Processes | Free Full-Text | Chromium Distribution, …
Hexavalent chromium (Cr(VI)) waste produced by chrome plating activities pollutes the surrounding environment and harms human health. However, information about the chromium (Cr) pollution characteristics of actual electroplating sites is still lacking. In this study, the concentration, leachability and speciation of Cr in soils from a typical …
chromium in basalt stone
chromium in basalt stone. will chromium leach from basalt. will chromium leach from basalt XSM excellent mining crushing machinery products or production line design, the company is committed to building the Chinese brand mine crushing and processing machinery, mainly crusher, mill, sand making our products (will chromium leach from …
Mineral processing: leaching process of chromium …
Abstract. The current strategy reports the recovery of precious group metals (PGMs) from Na 2 CO 3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under …
Recovery of chromium by calcium-roasting, sodium …
Here, we review chromium resources and methods to leach out Cr, such as calcium-roasting, sodium-roasting, acidic leaching, alkaline leaching and sub-molten …
Trace element partitioning in basaltic systems as a function …
Along with temperature, pressure and melt chemistry, magmatic oxygen fugacity (fO2) has an important influence on liquid and solid differentiation trends and melt structure. To explore the effect of redox conditions on mineral stability and mineral-melt partitioning in basaltic systems we performed equilibrium, one-atmosphere experiments …
Removal of chromium (VI) from aqueous solution using vesicular basalt
This study indicated that vesicular basalt, which is inexpensive, has the potential to remove chromium (VI) from polluted water. X-ray diffractogram of powdered vesicular basalt sample.
Chromium transformation driven by iron redox cycling in basalt …
Chromium (Cr) is an expression toxic metal and is seriously released into the soil environment due to its extensive use and mining. Basalt is an important Cr reservoir in the terrestrial environment. …
Enrichment and speciation of chromium during basalt …
@article{Sun2022EnrichmentAS, title={Enrichment and speciation of chromium during basalt weathering: Insights from variably weathered profiles in the Leizhou Peninsula, South China.}, author={Shengsheng Sun and Ming Ao and Ke-Rui Geng and Jie-Qian Chen and Teng-Hao-Bo Deng and Jingjie Li and Zeting Guan and Bingguo Mo and Ting Liu …
Iron, aluminium and chromium co-removal from
The study on iron, aluminium and chromium removal from laterite heap leach solutions by Guise and Castro (1996) showed that 41.3% iron, 21.8% aluminium and 29.5% chromium were rejected at pH 1.8 and 90 °C by the addition of 50 g/L MgO slurry in the first stage of the precipitation process. In the second stage of the precipitation …
Basalt – Minecraft Wiki
Trivia. Geologically, basalt is a volcanic rock that cools from mafic lava flows. Mafic lava is runny, much like Nether lava, and under the right conditions it can cool into the stacks of basalt columns seen in basalt deltas . Basalt makes up most of Earth's sea floor, as well as Iceland and the Hawaiian Islands.
Enrichment and speciation of chromium during …
However, the decreasing contents of Cr bound to Fe-oxides in the upper soils of the Ferralsol profile indicated that Cr could also be released during Fe leaching. …