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chromite ore processing method of outokumpu

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Making of chrome ore amidst 70 bird species

“Oxidic chromite ore is insoluble and does not release harmful compounds into the environment. Our concentration method is also entirely chemical-free. It is based on mechanical crushing, gravity separation and sealed water circulation,” explains Juha Kekäläinen, Manager of Environmental Affairs at Outokumpu’s Kemi and Tornio sites. The main outputs from the concentration process are sand and

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Chromite Mine Exploration Method

Chromite Ore Processing Method Of Outokumpu. Chromite ore processing method of outokumpu Outokumpu has awarded P246yry with the detail engineering project and site services assignment for the expansion project of the Kemi mine In this 250 million investment Outokumpu s Kemi mine will be deepened from the current 500 m level to 1 000 m to ensure continued ore supply for the future The investment enables Outokumpu

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Chromium: Outokumpu assessing higher chromium

2020-7-10  Much like Kazakhstan and India, Finland’s chromite output has been integrated with domestic ferrochrome production. This stands in contrast to South Africa, where the majority of chromite supply is now consumed by China. Outokumpu

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Kemi Mine, Finland Outokumpu

The mine is the source of chromite ore that is concentrated into upgraded lumpy ore and fine concentrate through sophisticated industrial operations at the surface. Both are then transported to the Tornio Ferrochrome Works for processing. Sustainability is a priority at Outokumpu. No chemicals are used in the gravity concentration process at the Kemi Mine.

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A new method for the treatment of chromite ore

2007-10-22  The chromite components are oxidized according to the following reaction: (1) 2FeCr 2 O 4 + 4Na 2 CO 3 + 3.5O 2 → 4Na 2 CrO 4 + Fe 2 O 3 + 4CO 2 (2) MgCr 2 O 4 + 2Na 2 CO 3 + 1.5O 2 → 2Na 2 CrO 4 + MgO + 2CO 2 The use of dolomite as a filler results in a large quantity of waste—chromite ore processing residues (COPR), sometimes as much as

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Extraction of Chromium from Chromite Ore

2017-7-20  Chromite Ore Processing. Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report.

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Detoxification and immobilization of chromite ore

2017-1-5  A promising strategy for the detoxification and immobilization of chromite ore processing residue (COPR) in a spinel-based glass-ceramic matrix is reported in this study. In the search for a more chemically durable matrix for COPR, the most critical crystalline phase for Cr immobilization was found to be a spinel solid solution with a chemical composition of MgCr 1.32 Fe 0.19 Al 0.49 O 4 .

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Application of the Rietveld method to assess

2007-3-15  Chromite ore processing residue (COPR) is generated as a by-product of the chromite ore ((Mg,Fe) (Cr,Al,Fe) 2 O 4) processing to isolate and extract chromium. The ore is mixed with quicklime and soda ash and roasted at high temperature (∼1200 °C).

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v117n11a9 SEM image processing as an alternative

2018-1-23  SEM image processing as an alternative method to determine chromite pre-reduction process are also being developed in China, but information regarding production capacities of these facilities is not yet available in the public domain. In the pelletized chromite pre-reduction process, fine chromite ore, a clay binder, and a

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Chromium processing Britannica

2 天前  Pure chromium is produced either by the thermal reduction of Cr 2 O 3 with aluminum or by the electrolysis of trivalent chromium solutions. The aluminothermic process begins with the roasting of fine ore, soda, and lime in air at 1,100 °C (2,000 °F).

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Chromium: Outokumpu assessing higher chromium

2020-7-10  Outokumpu has initiated an Environmental Impact Assessment (EIA) for plans to expand the Kemi mine in Finland. Though no decision has been made, planned changes to operations include: expansion of the mining concession area and mine within the limitations of the current allowed area; increases in the volumes of ore

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Chromite Beneficiation Process

2016-4-12  Chromite Grinding. The 36″x 8′ Adjustable Stroke Ore Feeder is used to accurately control feed of crushed ore to the grinding section. Before it is fed to the 4’x 8′ Peripheral Discharge Rod Mill, the minus ¼” chrome ore is removed from the grinding

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A new method for the treatment of chromite ore

2007-10-22  Chromite ore processing residue (COPR), derived from the so-called high-lime processing of chromite ore, contains a significant fraction of a leachabl

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A new method for the treatment of chromite ore

It is a great challenge to find an effective method for the treatment of chromite ore processing residue (COPR), due to the highly toxic and mobile characteristic of Cr(VI) in the sludge.

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Detoxification and immobilization of chromite ore

2017-1-5  A promising strategy for the detoxification and immobilization of chromite ore processing residue (COPR) in a spinel-based glass-ceramic matrix is reported in this study. In the search for a more chemically durable matrix for COPR, the most critical crystalline phase for Cr immobilization was found to be a spinel solid solution with a chemical

get price

Extraction of Chromium from Chromite Ore

2017-7-20  Chromite Ore Processing. Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known

get price

Characterisation and Pre-concentration of Chromite

2013-12-24  Floatex density separator. Generally for processing chromite ores, different types of gravity methods are employed after crushing, grinding followed by classification. The Tata Steel Chrome Ore Beneficiation (COB) plant is generating 50 tph of tailings assaying 17% Cr2O3. A

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Methods of Treatment of Chromite Ore Processing

2010-7-22  1. 1-75. (canceled) 76. A method for reducing chromium (VI) in an underground deposit of chromium ore processing residue, comprising: injecting a ferrous liquid into the underground deposit of chromium ore processing residue, with the underground deposit comprising solid residue particles, and with pore spaces between particles, with the ferrous liquid reducing the pH of the pore water to less

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Cellulose Mediated Reduction and Immobilization

2020-7-15  It is a great challenge to find an effective method for the treatment of chromite ore processing residue (COPR), due to the highly toxic and mobile characteristic of Cr(VI) in the sludge. This work reported a facile strategy to thoroughly reduce and immobilize Cr(VI) that was encapsulated in COPR by biomass-assistant hydrothermal treatment.

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v117n11a9 SEM image processing as an alternative

2018-1-23  SEM image processing as an alternative method to determine chromite pre-reduction process are also being developed in China, but information regarding production capacities of these facilities is not yet available in the public domain. In the pelletized chromite pre-reduction process, fine chromite ore, a clay binder, and a

get price

Case Study: Chromite mining and processing

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 Philippines and India.2 Chromite ore is initially

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Kaivosvastuu Outokumpu Chrome Oy

Description. The Kemi Mine is owned by Outokumpu Chrome Oy, a subsidiary of Outokumpu Oyj. It is located in Elijärvi, in the municipality of Keminmaa, to the north of Kemi. The Kemi Mine is the largest underground mine in Finland, with an annual production capacity of 2.7 million tonnes of ore. It is also part of the integrated ferrochrome and

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Chromite Beneficiation Process

2016-4-12  Chromite Grinding. The 36″x 8′ Adjustable Stroke Ore Feeder is used to accurately control feed of crushed ore to the grinding section. Before it is fed to the 4’x 8′ Peripheral Discharge Rod Mill, the minus ¼” chrome ore is removed from the grinding

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FACTORS AFFECTING THE REDUCIBILITY OF SINTERED

2015-5-22  Outokumpu Oy has developed a steel belt sintering process for sintering pellets from fine chromite concen-trate. Smelting of these pellets result s in excellent efficiency and smelting key figures. The recovery of chro-mium depends on the grade of chromite, the method of chromite pre-treatment and the smelting process (e.g. temperatures).

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A new method for the treatment of chromite ore

It is a great challenge to find an effective method for the treatment of chromite ore processing residue (COPR), due to the highly toxic and mobile characteristic of Cr(VI) in the sludge.

get price

Characterisation and Pre-concentration of Chromite

2013-12-24  Floatex density separator. Generally for processing chromite ores, different types of gravity methods are employed after crushing, grinding followed by classification. The Tata Steel Chrome Ore Beneficiation (COB) plant is generating 50 tph of tailings assaying 17% Cr2O3. A

get price

Thermodynamics of chromite ore oxidative roasting

2011-1-14  and large quantities of chromite ore processing residues (COPR) containing a lot of highly toxic, carcinogenic most popular chromate production method [1, 6]. The chromite ore oxidative reactions in lime-free roasting process are complicated gas−liquid−solid

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Extraction of Chromium from Chromite Ore

2017-7-20  Chromite Ore Processing. Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known

get price

Methods of Treatment of Chromite Ore Processing

2010-7-22  1. 1-75. (canceled) 76. A method for reducing chromium (VI) in an underground deposit of chromium ore processing residue, comprising: injecting a ferrous liquid into the underground deposit of chromium ore processing residue, with the underground deposit comprising solid residue particles, and with pore spaces between particles, with the ferrous liquid reducing the pH of the pore water to less

get price

v117n11a9 SEM image processing as an alternative

2018-1-23  SEM image processing as an alternative method to determine chromite pre-reduction process are also being developed in China, but information regarding production capacities of these facilities is not yet available in the public domain. In the pelletized chromite pre-reduction process, fine chromite ore, a clay binder, and a

get price
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