Enrichment and speciation of chromium during basalt …
(DOI: 10.1016/j.scitotenv.2022.153304) This article is published in Science of The Total Environment.The article was published on . It has received 8 citations till now. The article focuses on the topics: Medicine & Weathering.
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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 …
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Enrichment and speciation of chromium during basalt …
Chromium (Cr) accumulating in soil caused serious pollution to cultivated land. At present, nano zero-valent iron (nZVI) is considered to be a promising remediation material for …
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Microbes In Basalt Thrive On A Mixed Diet Of Toxic Wastes
Once inside the cell, these ions are reduced (electrons are added) first to pentavalent chromium (Cr5+), then to trivalent chromium (Cr3+), which disrupts DNA replication.
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Chromium biogeochemical cycling in basalt-derived paddy …
Although basalt-derived paddy soils contain high Cr levels and pose serious environmental risks, the mechanisms controlling Cr transformation during anoxic–oxic alternation remain unclear. In this study, the major geochemical processes controlling the release, geochemical speciation, and Cr redistribution during anoxic–oxic alternation were investigated …
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The chromium and nickel distribution in basaltic rocks and …
Covariance of chromium and nickel in basaltic rocks has been observed for a worldwide sampling and during fractional crystallization of a basaltic magma suggesting preservation of the …
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(PDF) Chromium transformation driven by iron redox cycling in basalt
The model-based findings demonstrated that the Cr transformation in the basalt-derived paddy soil with high geological background values was highly driven by redox sensitive iron cycling. Discover ...
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chromium mining machinery
what machines are used to mine chromium,Chromium ore processing and chromium mining rating 4.7/5018332Chat Online>> Chromium ore processing and chromium mining ...
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A green method to leach vanadium and chromium from …
The leaching efficiency of chromium exhibited a significant increase with the increase of VR from 0.2 ml/g to 1.0 ml/g. During the leaching process, H 2 O 2 was mainly used to oxidize chromium in low valent to water-soluble chromate (CrO 4 2−). In other words, leaching of chromium was much more depend on the addition of H 2 O 2 than vanadium.
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en/165/chromium crusher associated.md at main
Write better code with AI Code review. Manage code changes
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Basics of Geochemistry and Mineralogy of Chromium
The atomic weight of the most abundant (83.789%) chromium isotope is 51.996. A total of 26 isotopes of chromium from 42 Cr to 67 Cr are known. Among them, there are three stable isotopes: 52 Cr, 53 Cr, and 54 Cr. 53 Cr is the product of 53 Mn radiogenic decay (a half-life is 3.74 m.y.). In addition, there are 19 radioisotopes with 50 Cr being the most stable (with a …
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Recovery of chromium from vanadium precipitated solution …
The chromium-containing vanadate solution was provided by Pangang Group Vanadium & Titanium Resources Co., Ltd., which was obtained by roasting vanadium slag with Na 2 CO 3 and then leaching with water. The vanadium precipitated solution is obtained by adding Ca(OH) 2 and ball milling for 60 min which was the raw material for this study, and its …
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Chromium contamination and effect on environmental …
Chromium (Cr) is a trace element critical to human health and well-being. In the last few decades, its contamination, especially hexavalent chromium [Cr(VI)] form in both terrestrial and aquatic ecosystems, has amplified as a result of various anthropogenic activities. Chromium pollution is a significant environmental threat, severely impacting ...
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Chromium geochemistry and speciation in natural waters, …
Chromium is the 24th most abundant element in Earth's crust with an average concentration of ∼100 ppm (null, Emsley, 2001).In contrast, the chromium concentrations in natural waters are generally low or <1 ppb (e.g. Richard and Bourg, 1991, Davis et al., 1994).Elevated concentrations of up to several ppm may occur in waters having low pH values, …
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Chromium biogeochemical cycling in basalt-derived paddy …
DOI: 10.1016/j.chemgeo.2023.121393 Corpus ID: 257037193; Chromium biogeochemical cycling in basalt-derived paddy soils from the Leizhou Peninsula, South China @article{Xia2023ChromiumBC, title={Chromium biogeochemical cycling in basalt-derived paddy soils from the Leizhou Peninsula, South China}, author={Zhao Xia and Yang Yang and Tongxu …
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Preventing Chromium Leaching
In figures 3 and 4, the chromium leach-ability increases as the CaO:SiO2 ratio is decreased below the range around 1.2 to 1.3, the level of minimum leachability. The appearance of a more leachable chromium phase is evidently occurring. This result complicates the addition of silica proposed in the patent by Nagaya.
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Mineral processing: leaching process of chromium and …
The current strategy reports the recovery of precious group metals (PGMs) from Na2CO3 roast of Saudi Arabian ophiolitic chromite ore at 1160 °C under atmospheric O2. The influence of roasting temperature (960–1200 °C) and leaching agents (H2O, HCl, H2SO4) and their concentrations on the recovery of PGMs was studied. Chromite roast concentrates a …
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Extraction of vanadium from vanadium slag by sodium …
In the present work, a sustainable process for extraction of vanadium (V) from vanadium slag was proposed. The vanadium slag was first roasted by Na 2 CO 3, then leached by (NH 4) 2 SO 4.The effect of roasting and leaching conditions on V and major impurities (P, Si) leaching have been systematically investigated.
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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 worldwide and enrich in …
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Chromium |
Chromium(III) is the predominant oxidation state of chromium in many soils. Cr(III) binds to soil and has low mobility. A lower soil pH favors the reduction of Cr(VI) to Cr(III). Runoff from soil and industrial processes may …
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Chromium transformation driven by iron redox cycling in basalt …
Chromium transformation driven by iron redox cycling in basalt-derived paddy soil with high geological background values ... (Wu et al., 2021). The rapid weathering of basalt lead to the leaching of Ca, Na and Mg, and consequent formation of acidic soils rich in Fe/Al oxides as well as Cr (Chorover et al., 2004; Mendoza-Grimón et al., 2014 ...
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(PDF) Chromium isotope fractionation during magmatic …
Chromium (Cr) isotopes represent a powerful tool for tracing the redox conditions during planetary magmatic evolution. However, so far, the systematic investigation of Cr isotope variation has ...
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Mass transfer coefficients (τ Nb,j ) for Cr and major elements …
Chromium was locally found at the dispersed spots and lines in basalt rocks (Fig. S-3), indicating that the main Cr-bearing minerals are chromite (Cr-spinel). The differential abundance of Cr vs....
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(PDF) Enhanced Weathering Using Basalt Rock Powder: …
Importantly, basalt amendment did not negatively affect potato growth and yield (which even tended to increase), despite increased Al availability in this alkaline soil.
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Silicon and chromium stable isotopic systematics during basalt
Two Deccan Traps basalt weathering profiles of contrasting age and alteration intensity provide a natural laboratory for investigating the effects of rock alteration on Si and Cr and their isotopic systematics. The Quaternary Chhindwara profile has progressed to a moderate degree of alteration (saprolite), while the Paleogene Bidar example displays an extremely …
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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 …
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Separation and Recovery of Chromium from Solution After Vanadium
The separation and recovery of chromium from solution after vanadium precipitation were investigated by deep removal of vanadium, hydrolysis precipitation of chromium, and preparation of chromium oxide. Hydrous oxide of trivalent iron is an effective deep vanadium remover and can be recycled. Under the most suitable conditions including hydrous …
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AN ANALYSIS OF STEEL SLAG AND ITS USE IN ACID MINE
Chromium <0.038 5.0 Lead <0.004 5.0 Mercury <0.0 0.2 Selenium <0.003 1.0 Steel slag may also contain other heavy metals, including: Sb, Cu, Mn, Mo, Ni, Ag, Tl, Sn, V, and Zn. There is some concern that these elements may leach from steel slag if slag is used in AMD treatment. This issue will be discussed in more detail later in this paper.
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Stainless Steel Leaching into Food and Beverage — …
The addition of chromium prevents the corrosion that causes rust, and also prevents stains, thus the name "stainless steel." The chromium--and this is an important point with regards to metal toxicity--forms a layer of chromium oxide over the steel when exposed to oxygen. This layer is impervious to water and air, protecting the metal beneath.
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Chromium ingot
Chromium ingots are metal bars dropped by The Leviathan, The Whisperer, Vardorvis, and Duke Sucellus. They are used in the process of creating the four ancient rings, each requiring three ingots. Item sources [edit | edit source] Source Level Quantity Rarity League region; Duke Sucellus: 538; 758; 1099 : 1: 3/720: The Leviathan:
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