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Chromite ore processing residue (COPR) poses a great environmental and health risk with persistent Cr(VI) leaching. To reduce Cr(VI) and subsequently immobilize in the solid matrix, COPR was incubated with nanoscale zero-valent iron (nZVI) and the Cr(VI) speciation and leachability were studied.
The process of chromite ore mining can be divided into 2 areas: 1. Feed preparation. 2. Concentration. The feed preparation stage involves the introduction of various physical separation equipment including crushers, screens and grinding mills. The principal function of this stage is size reduction in preparation for the concentration phase.
chromite ore soda sodium chromate 1 1 (4-10). Processing of chromite ore in the melt soda and sodium chromate, i.e. in the presence of the product of the high temperature processing, and are formed in the liquid (molten) state, eliminates nataliapopovalui. The main component of …
Mar 18, 2020 Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of northern India.
May 21, 2021 Chromite ore processing residue (COPR) storage sites are widely distributed all over the world, causing serious soil and groundwater pollution. However, the differences in soil constituents and properties between different regions are significant, and …
May 01, 1991 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 bichromate chemical manufacturing. At least 15% of the sites contain total chromium concentrations greater than 10,000 mg/kg, with hexavalent content ...
May 22, 2021 The present study investigates the recovery of chromite from a low-grade ferruginous ore through the carbothermic magnetization route using convention…
Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite ...
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 ...
Chromite is important because it is the only economic ore of chromium, an essential element for a wide variety of metal, chemical, and manufactured products. Many other minerals contain chromium, but none of them are found in deposits that can be economically mined to produce chromium.
Reducing energy consumption by alternative processing routes to produce ferrochromium alloys from chromite ore . Authors: Arthur Barnes (corresponding) (1); Mika Muinonen(1) and M. J. Lavigne(2) (1) XPS Testwork and Consulting Services 6 Edison Rd, Falconbridge, ON, P0M 1S0
Evaluation of the treatment of chromite ore processing . The effectiveness of the treatment of chromite ore processing residue (COPR) with ferrous sulfate and encapsulation into asphalt were explored separately and in . Inquiry Online. Sustainable use of earth's natural resources - Outotec.
T1 - Chromium steel from chromite ore processing residue - A valuable construction material from a waste. AU - Meegoda, Jay N. AU - Kamolpornwijit, Wiwat. PY - 2011/6/1. Y1 - 2011/6/1. N2 - As species we humans generate excessive amounts of waste and hence for sustainability we should explore innovative ways to recover them. The primary ...
Mihail I. Gasik, in Handbook of Ferroalloys, 2013 8.2.3 Chromium Ores and Chromites Processing. Chromite ores, as might many others, be mined by open-pit and underground methods. The share of underground mining varies between countries and deposits. The extracted ore is subjected to crushing and sorting (normally rich ore containing more than 45% Cr 2 O 3 is supplied to the processing plant ...
Apr 24, 2020 The process of chromite ore mining can be divided into 2 areas: 1. Feed preparation. 2. Concentration. The feed preparation stage involves the introduction of various physical separation equipment including crushers, screens, and grinding mills. The principal function of this stage is size reduction in preparation for the concentration phase.
The speciation and distribution of Cr(VI) in the solid phase was investigated for two types of chromite ore processing residue (COPR) found at two deposition sites in the United States: gray-black (GB) granular and hard brown (HB) cemented COPR. COPR chemistry and mineralogy were investigated using micro-X-ray absorption spectroscopy and micro-X-ray diffraction, complemented by laboratory ...
Sodium chromate is produced via the soda-ash roasting of chromite ore with sodium carbonate. After the reaction, nearly 15 pct of the chromium oxide remains unreacted and ends up in the waste stream, for landfills. In recent years, the concern over environmental pollution from hexavalent chromium (Cr6+) from the waste residue has become a major problem for the chromium chemical industry.
May 15, 2019 Study of Chrome Ore Magnetic Separation and Gravity Separation Process. The chrome ore beneficiation processes include gravity separation, flotation, magnetoelectric separation and chemical beneficiation, etc. Because of the chrome ore composition that composed of one or more silicate, and the density difference between the chrome and silicate, the research both in home and aboard about chrome beneficiation process mainly focuses on the gravity separation process.
Jul 14, 2020 As an alternative, processing of ore through pyro-metallurgical route was evaluated. Chromite fines mixed with carbon and lime in the form of pellets/granules was charged to a plasma reactor. In about ten minutes, the metal globules/prills were separated from the slag in 1:6 ratio.
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