Potential Toxic Effects of Chromium, Chromite Mining and
Chromium-III oxidation to Cr-VI occurs under favourable pH and moisture conditions with the presence of manganese oxides, alkali oxides or calcium compounds, during bush fires, water treatment, waste incineration and chromite ore dry grinding and smelting. Chromium-VI can have long residence times in surface water, groundwater and
Case Study: Chromite mining and processing
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, Turkey, the
Hexavalent Chromium Compounds - Cancer-Causing Substances
15/2/2019& 0183;& 32;Learn about chromium, exposure to which can increase your risk of lung cancer and cancer of the paranasal sinuses and nasal cavity. Hexavalent chromium compounds have been used as corrosion inhibitors in a wide variety of products and processes.
Chromium in Environment, Its Toxic Effect from Chromite
6/7/2018& 0183;& 32;Due to the friability of the South African chromite ores, it is common to only recover 10–15% lumpy ore 15 mm < typical size range < 150 mm and 8–12% chip/pebble ores 6 mm < typical size range < 15 mm during the beneficiation process employed after chromite mining, which has the effect that large dump sites are formed Beukes et al. 2010; Glastonbury et al. 2010 .Cited by: 32
Chromite mining - The Oregon Encyclopedia
Chromite is a mineral that contains chromium. It is considered a strategic mineral, which generally means that it is necessary for military and industrial use during periods of national emergency. The strategic mineral concept was created during World War I and became law just prior to World War II with the passage of the Strategic Minerals Act of 1939.
Chromium Memorial Sloan Kettering Cancer Center
26/11/2019& 0183;& 32;Chromium is an element required by the body in very small amounts 0.025 mg a day . Adequate amounts are usually obtained in the diet from foods such as American cheese, meat, fish, fruits, and whole grains. Lab experiments suggest chromium is involved in maintaining adequate levels of glucose, fats, and insulin in the body.
Chromite Ore - an overview ScienceDirect Topics
The chromium content ranges from 34 to 42%, that of silicon from 38 to 45%, and that of carbon from 0.05 to 0.06%. The mix order is similar to that of smelting high-carbon ferrochromium except that it requires a source for additional silicon. It is produced by smelting together chromite ore and quartz.
Chromium Mining, Chromium Mine, Chromium Mines, Metal
Chromium is mined as chromite FeCr2O4 ore. About 2/5ths of the chromite ores and concentrates in the world are fashioned in South Africa, while Kazakhstan, India, Russia, and Turkey are also sizeable producers. Unexploited chromite deposits are plentiful, but …
Chromite - Department for Energy and Mining
Chromite, a brownish black cubic mineral belonging to the spinel group, is the only ore mineral from which metallic chromium and chromium compounds are obtained. It has the chemical formula FeCr 2 O 4, and a theoretical composition of 32.0% FeO and 68.0% Cr 2 O 3. In its natural form it occurs in solid solution with other minerals in the spinel
Chromite - ScienceDirect
1/1/2016& 0183;& 32;Although the intention of chromite mining is to remove chromite from the ore for the production of ferrochrome, the process is not 100% efficient, so mining and smelting wastes including dust, wastewater, tailings, waste rock, and slag produced during ferrochrome separation from the ore still can contain different forms of Cr, including Cr VI .
Potential Human Health Effects of Uranium Mining
Many of the findings related to occupational exposures and adverse health outcomes presented in this chapter are based on studies of uranium and hard-rock miners e.g., worker-based radon studies for periods of disease risk when the magnitude of the exposures was much greater than the exposures reported at most mines and processing facilities in North America today. Nevertheless, although
PDF 40 Common Minerals and Their Uses - The National Mining
chromite ore production in various forms of im-ported materials, such as chromite ore, chromite chemicals, chromium ferroalloys, chromium metal and stainless steel. It’s used as an alloy in stainless and heat resisting steel products. It’s also used in chemical and metallurgical indus-tries chrome fixtures, etc. . Superalloys require chromium.
REE - Rare Earth Elements - Metals, Minerals, Mining, Uses
Mining companies see high prices as an opportunity and attempt to develop new sources of supply. With rare earth elements, the time between a mining company's decision to acquire a property and the start of production can be several years or longer. There is no fast way to open a new mining property.
Sodium chromate Na2CrO4 - PubChem
The capacity of glutathione to reduce Cr VI to Cr III in vitro was investigated.The reaction was determined spectrophotometrically by following the absorption of Cr VI at 370 nm. At stoichiometric conditions molar ratio Cr VI /GSH of 1:3 the reduction was strongly dependent on the solution's pH. It was much slower at pH 7.4 than at pH values below 5.
Life cycle assessment of cobalt extraction process
Aug 01, 2019& 0183;& 32;Open-pit mining. This method can be used if the ore is close to the surface and it is known to be the most economical mineral extraction method. In this type of mining, overburdens are removed to extract the desired metals using trucks or other conveying machines Zhao et al., 2013 . 2.2. Underground mining
6 Potential Environmental Effects of Uranium Mining
If surface or underground uranium mining were conducted in Virginia, the extent of surface water contamination, including releases of both radionuclides and toxic metals, would depend on the mineral composition of the ore, the miti-gative steps taken to minimize impacts to downstream receiving waters, and the long-term performance of those
Lung cancer - Wikipedia
Lung cancer, also known as lung carcinoma, is a malignant lung tumor characterized by uncontrolled cell growth in tissues of the lung. This growth can spread beyond the lung by the process of metastasis into nearby tissue or other parts of the body. Most cancers that start in the lung, known as primary lung cancers, are carcinomas. The two main types are small-cell lung carcinoma SCLC and
Molybdenum - Wikipedia
Molybdenum is a chemical element with the symbol Mo and atomic number 42. The name is from Neo-Latin molybdaenum, which is based on Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known throughout history, but the element was discovered in the sense of differentiating it as a new entity from the mineral salts of
Physical Properties of Water - an overview ScienceDirect
Chromium III is a nutritionally essential element. Chromium VI is much more toxic than chromium III and causes liver and kidney damage, internal hemorrhaging, respiratory damage, dermatitis, and ulcers on the skin at high concentrations. Copper: Enters environment from metal plating, industrial and domestic waste, mining, and mineral leaching.
Iron Fe - Chemical properties, Health and Environmental
Iron may cause conjunctivitis, choroiditis, and retinitis if it contacts and remains in the tissues. Chronic inhalation of excessive concentrations of iron oxide fumes or dusts may result in development of a benign pneumoconiosis, called siderosis, which is observable as an x-ray change.
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