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The obtained results showed that chromium extraction causes numerous irreversible degradation of the environment in the Bulqiza area, such as the destruction of surface land layers and erosion,...
The persistence of Cr(VI) in water has serious implications both for human and aquatic fauna due to its toxicity. The present mining activities and its expansion in future are …
Wastes of Chromite Mining. Chromite mining wastes have the potential to cause serious environmental contamination. This occurs in places around the world where these wastes are inadequately managed. Overburden is an important type of mine waste. Overburden includes the soil and rock that is removed to gain access to ore deposits at …
The primary aim of the study was to investigate the degree of soil pollution occurring near chromite mines, and make a systematic evaluation of soil contamination based on geoaccumulation index, enrichment factor and pollution index.
Factors affecting carbon dioxide fixation in chrysotile mining residues (CMR) under environmental conditions were studied by reproducing mineral dissolution and carbonation in laboratory columns packed with CMR particles. Carbonation is very sensitive to water saturation and watering frequency of the CMR porous media.
Chromium hexavalent is mobile in the environment and is highly toxic to all forms of living systems including microorganisms which cause oxidative stress in organisms. It can easily penetrate the...
Waste and dust generated by chromite mines and ferrochrome smelters may contain Cr in its highest oxidized hexavalent state (Cr (VI)), which is extremely …
The refractory industry uses chromite for forming bricks and shapes, as it has a high melting point, moderate thermal expansion, and stable crystalline structure; Tanning leather; References: Chromite mineral facts. …
In addition, mining puts a stress on the environment and would likely damage the biodiversity and ecological integrity which may include habitat loss/ alteration, habitat fragmentation, introduction of foreign species and …
Abstract and Figures. Sukinda valley in Jajpur and Dhenkanal district of Odisha contains about 98% of the chromite reserve and it is being exploited by Opencast Mining since 1950. Out of six ...
The detrimental outcomes associated with AMD can impact three environmental areas such as (1) contaminated drinking water; (2) disrupted growth and reproduction of aquatic plants and animals; and (3) corroding effects of acid on infrastructure such as bridges, railways and ships.
Chromium is unstable in an oxygenated environment and, when exposed to air, immediately produces an oxide layer which is impermeable to further oxygen …
However, the Ring of Fire is located in an area that forms part of the largest peatland (a type of wetland) in the world (Warner and Rubec, 1997), which makes it environmentally and logistically challenging for mining operations. Developing chromite mining and/or processing, as well as building infrastructure in this sensitive ecosystem …
Case Study: Chromite mining and health concerns 4 Human exposure Although humans are exposed to chromium through air, water, food or supplements containing chromium, …
From mining to processing ferrochrome, various toxic emissions, waste products and greenhouse gas emissions are produced. There are impacts of roads and developments in the Ring of Fire area,...
Sukinda is one of the most polluted regions of the globe due to chromium pollution. The study sheds light into the heavy metal pollution around the mining area and its effect on the health of the resident populace. The Cr (VI) was in the range of 0.027–2.48 mg/L in surface water and BDL–1.35 mg/L in the groundwater.
Thus, the incorporation of enforceable dual environmental responsibility requirements in contract mining agreements is needed to overcome this problem. This article recommends that, to break the poverty cycle, the primary cause of environmental mismanagement in the sector, miners need to be empowered through claim ownership …
Chengde city is located in the agro–pastoral transitional zone in northern China near the capital city of Beijing, which has experienced large-scale ecological construction in the past three decades. This study quantitatively assessed the environmental changes in Chengde through observation records of water resources, …
Chromium and magnesite are two georesources considered (chromium) or listed (magnesium) as Critical Raw Materials for the EU. This mineralogical association is hosted within peridotites, the main source of olivine, and can therefore provide an interesting case of sustainable mining.
Waste and dust generated by chromite mines and ferrochrome smelters may contain Cr in its highest oxidized hexavalent state (Cr (VI)), which is extremely soluble, reactive and far more hazardous...
Case Study: Chromite mining and health concerns 5 Chromium mining and processing In nature, chromium is found as chromite ore, composed of elemental iron, oxygen and chromium (FeOCr 2 O 3). 1,2 heavily in about a 700 m vicinity around the Countries with commercially significant chromite mines include Russia, South Africa, Zimbabwe, …
Chromite mining activities expose the heavy metal Cr(VI) to the surrounding environment. Cr(VI) being a proven environmental carcinogen, expresses its toxicity on the biological entities. Several pieces of research have been …
ENVIRONMENTAL PROBLEMS OF CHROMITE MINING: Presence of Cr(VI) in mine drainage water: Opencast chromite mining generate huge volumes of seepage water. Eventhough chromium in chromite is in the trivalent state, some hexavalent Cr(VI) is always formed due to certain complex reactions.
Abstract A combination of poor mining methods, waste storage and disposal systems, as well as the day-to-day activities associated with tribute and contract chromite mining are primarily responsible for environmental problems on the Zimbabwe Great Dyke.
Chromite mining can create hostile conditions for organisms in the surrounding environment. Overburden soil and mine water samples were collected and analyzed for their microbial diversity, nutrient content, and …
Chromium in the environment. Chromium is mined as chromite (FeCr 2 O 4) ore. Chromium ores are mined today in South Africa, Zimbabwe, Finland, India, Kazakihstan and the Philippines. A total of 14 million tonnes of chromite ore is extracted. Reserves are hestimated to be of the order of 1 billion tonnes with unexploited deposits in Greenland ...