chromite ore toxic

Pollution resistance assessment of plants around chromite

From open-cast mining, a massive amount of gaseous pollutants, toxic substances, fine ore particles and dust are released to the environment (Das et al. 2020). These released pollutants mix with the atmosphere and are transported at a long distance through the air from the mine area and lead to pollution in the surrounding undisturbed …

(Bio)leaching Behavior of Chromite Tailings

Because of its toxicity, mobility, and enrichment in chromite and other Cr bearing phases in chromite tailings, the leaching behavior of chromium is of particular interest. ... For the chromite ore 1, Cr(VI) extracted with water is equivalent to total Cr extracted with KH 2 PO 4, with an average value of 3.4 mg/kg, while the Cr(VI) ...

Particle size and pH effects on remediation of chromite ore processing

The COPR materials used throughout this study were obtained from a deposition site located in Hudson Country, NJ, USA. COPR materials are derived from the roasting process of chromite ore mixed with lime and soda ash at ∼ 1200 °C to oxidize the chromium (Cr) from the trivalent to the hexavalent state and sequester impurities. The …

A new method for the treatment of chromite ore processing …

Chromite ore processing residue (COPR), derived from the so-called high-lime processing of chromite ore, contains a significant fraction of a leachable Cr(VI) which is harmful to human being and other organisms. In recent years, the concern over environmental pollution from the waste residue containing Cr(VI) has become a major …

Occupational health assessment of chromite toxicity

The Sukinda Valley ore samples contain 50% chromite ore is economic. But the >7% of CR (III) ore in the tailings and overburden shall warrant the future expected exorbitant Cr (VI) in the geo-bio ...

Sufficient extraction of Cr from chromium ore processing

Chromium ore processing residue (COPR) is a hazardous waste generated during the production of chromate. Currently, approximately 10% of Cr2O3 cannot be extracted after chromite sodium roasting ...

One-step natural pyrite-assisted mechanochemical

Traditional wet and dry Chromite Ore Processing Residue (COPR) detoxification methods consume acid for pH adjustment and produce greenhouse gasses (CO 2), yielding potential secondary pollution.It is imperative to develop an environmentally-friendly, efficient, and effective method for COPR treatment. This study reported the one …

Efficient Process for the Production of Cr2O3 from Chromite Ore

The method improves the mass-transfer rate of liquid-phase materials, leading to greater leaching efficiency of chromium from chromite. Additionally, this method reduces pollution from toxic chromite ore processing residues. Additionally, other metal components of the mixture can be utilized more efficiently.

Chromite Ore from the Transvaal Region of South Africa; Toxic …

The delisting of both chromite ore mined in the Transvaal Region of South Africa and the unreacted ore component of the COPR from the EPCRA section 313 list of toxic chemicals will reduce the overall reporting and recordkeeping burden estimate provided for the TRI program, but this action does not require any review or approval by …

A detoxification and value-added process for chromium ore …

Chromite ore processing residue (COPR) is a byproduct produced in chromite processing at high temperature (1000–1200 °C) ... The toxic Cr (Ⅵ) was reduced to Cr (Ⅲ) which was concentrated in high alumina spinel phases during the sintering process. The obtained sinters were identified as nontoxic, and no secondary waste was …

Chromite mining pollution, environmental impact, …

Abstract. Chromite mining activities are indispensable for production of goods and services. Sukinda is a major mining site of Odisha, India, polluted by …

Detoxification and immobilization of chromite ore

The Toxicity Characteristic Leaching Procedure (TCLP) total Cr concentration of the detoxified slag was 0.26 mg/L meeting the EPA standard (＜5 mg/L). The reaction mechanism was elucidated based on thermodynamics, kinetics, and mineral characterization. ... The traditional chromite ore processing residue (COPR) …

Production of chromite ore from Odisha (>

To reduce Cr (VI) toxicity, a study was undertaken to assess the effectiveness of common macrophytes in the range of Cr concentration prevalent in chromite mining areas at Sukinda, Odisha, India ...

Chromite

Chromite ore is the primary material to produce chromium compounds and chromium-containing products. In 2018, the global mine production of chromite ore was about 43 million metric tons, with more than 90% of those mined in five countries, Finland, India, Kazakhstan, South Africa, and Turkey. South Africa is the leading chromite producer ...

Full article: Health hazards of hexavalent chromium …

To its widespread use in industries Cr (VI) is highly toxic and one of the most common environmental contaminants. Cr (VI) is frequently non-biodegradable in nature, which …

Simultaneous oxidation of Cr(III) and extraction of Cr(VI) …

Chromite ore processing residue (COPR) is commonly produced as the byproduct in the manufacture of chromates and dichromates by chromite-ore high-lime roasting technique [1]. ... (VI), including both the encapsulated Cr(VI) and the oxidation of Cr(III) from the unreacted feedstock of ore-chromite. In this work, a novel non-toxic and ...

The disposition of chromite ore processing residue (COPR) incorporating

The feasibility of using industrial symbiosis for solid waste disposal was explored via a regional industrial symbiosis case that recycled chromite ore processing residue (COPR) in the sintering, iron-making and steel-making process. The process was analyzed from three aspects: the reduction rate of Cr(VI) in chromium slag, the utilization …

Chromium: A Thoroughly Modern Metal | Dartmouth Toxic …

The crushed ore was mixed with a resin and pressed into brick shapes. Alternatively, they were fired at low temperatures like clay. In the 1930s refractories made from mixtures of chromite and magnesite in various percentages were produced for different applications. In 2000, four million metric tons of chromite were mined worldwide.

Metal biomonitoring using fractioned dust to investigate

The major toxic metal in chromite mining is Cr, and its occupational exposure usually occurs through chromite mining, chrome plating, chromate stainless-steel production, and tanning industries. ... Cr in the chromite ore processing plants had a mean concentration of Cr 354.10 ± 12.43 and 303.69 ± 66.39 mg/kg in 75–106 µm and 106–150 …

Geology, Mining and Environment with an …

Despite people suffering from several forms of ill health, physical and mental deformities, constant exposure to toxic wastes and chronic diseases as a result of chromite mining, there is a tragic ...

Source, Pollution and Remediation of Carcinogenic Hexavalent …

Toxicity; Technology; Download chapter PDF 12.1 Introduction. French chemist Louis Nicolas Vauquelin discovered a metal with ability to form coloured compounds in 1797 and named chromium after Greek word Chroma, meaning colour. ... India rank 3rd in chromite ore production worldwide and 97% of that production of India comes from a …

Effective Extraction of Cr(VI) from Hazardous Gypsum Sludge …

Through controlling the phase transformation and chromium species under hydrothermal condition, the Cr(VI) was extracted fully from hazardous Cr( VI)-containing gypsum sludge, with a very high efficiency. Through controlling the phase transformation and chromium species under hydrothermal condition, the Cr(VI) was extracted fully from …

What Is Chromium?

Trivalent (Cr [III]) and hexavalent (Cr [VI]) compounds are thought to be the most biologically significant. Cr (III) is an essential dietary mineral in low doses. Cr (VI) compounds are carcinogenic. Cr (VI) is generally considered 1,000 times more toxic than Cr (III) [EPA …

Chromite Ore Processing Residue in Hudson County, …

Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Many of these sites are in urban residential areas. This waste is a result of 70 years of chromate and ... Acute toxicity of chromium compounds from industrial accidents or deliberate ingestion can result in gastro-intestinal symptoms and bleeding. A late ...

Remediation of hexavalent chromium contamination in chromite ore …

Large amounts of chromite ore processing residue (COPR) wastes have been deposited in many countries worldwide, generating significant contamination issues from the highly mobile and toxic hexavalent chromium species (Cr(VI)). In this study, sodium dithionite (Na 2 S 2 O 4) was used to reduce Cr(VI) to Cr(III) in COPR containing …

Recovery of chromium by calcium-roasting, sodium …

A large amount of leaching residue contained toxic Cr (VI) was produced, which was up to 2.5–3.0 t/t chromium products. ... the oxidation of chromite ore in sub-molten process was more easily and quantitatively controlled the oxidation reaction and the separation process due to the oxygen anion exchange in the sub-molten salt medium …

Eco-toxicity of hexavalent chromium and its adverse …

A far-reaching production of different forms of chromite ore has bowed this area into a contamination-prone region due to the deposition of an unacceptable …

Characterization of Chromite Ore Processing Residue

Oct 1, 2007. Characterization of Chromite Ore Processing Residue. Authors: Wiwat Kamolpornwijit, Jay N. Meegoda, and Zhengbo Hu Author Affiliations. Publication: …

Chromite

Chromite ore is mined in over 20 countries, but about 80% of production originates from four countries: South Africa, India ... The metal form of chromium, as it exists in this product, is of low toxicity. However, the chromite with hexavalent form is toxic. The adverse effects of the hexavalent form of chromite on the skin include ulcerations ...

(PDF) A Review of Chromite Ore Processing Residue (COPR): …

Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr[VI]). Although the high temperature chromite process was ...