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CHARACTERIZATION AND BENEFICIATION OF ANKA

The only important ore mineral of chromium is the chromite FeO.Cr 2O3 (68% Cr 2 O 3,32% FeO) which crystallizes in the isometric system. The hardness value is 5.5 on

Characterization and Beneficiation of Anka Chromite Ore

Chromium is largely used as alloying elements in steels for production of stainless steels. It is added in form of ferro-chromium, which is presently imported from Russia and Germany to meet the need of Nigerian Steel Industry. Chromite ore (FeOCr2O3) is the most important mineral occurrence of chromium, and some deposits are reported in Anka Local Government Area of

Characterization of Chromite Ore Processing Residue

The manual/dry magnetic separation was able to concentrate iron and chromium oxides in COPR from the former group to 34.9–40.9 and 6.3–8.6%, respectively. The morphology of COPR from a sample containing high iron content revealed that COPR is mainly the remnant of chromite ore.

Characterization of chromite ore processing residue —

Abstract. This paper summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions, phases, and recycling potential of iron and chromium through preliminary magnetic separation. COPR from nine hazardous waste sites in Hudson County, N.J., were analyzed using nondestructive instruments including

Chemical Composition of the Enriched Ore Download Table

Download Table Chemical Composition of the Enriched Ore from publication: Characterization and Beneficiation of Anka Chromite Ore Using Magnetic Separation Process Chromium is largely used as

Chromium (VI) Retrieval from Chromium Ore Processing

2017-9-11  “Chromite ore processing residue” (COPR) is a typical waste from the chromium metal industry. Chromium production started in the first part of the nineteenth century and has been increasing ever since, particularly for use in the production of stainless steel and a wide range of other materials (Blazy and Hermant 2014).The production of chromate, a raw

Discovery, properties and applications of chromium and its

2015-2-13  Naturally occurring chromium is composed of the three stable isotopes 52 Cr, 53 Cr and 54 Cr with 52 Cr being the most abundant (83.8 %). 19 radioisotopes have been characterized with the most stable being 50 Cr with a half-life of more than 1.8 × 10 17 years and 51 Cr with a half-life of 27.7 days. All of the remaining radioactive isotopes have half-lives that

Microstructural Analyses of Cr(VI) Speciation in Chromite

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,

Characterization of Chromium (III) Compounds Isolated

2018-9-20  Characterization of the Chromium Precipitates Isolated from the SARM 131 Reference Sample, Merensky Reef, and UG2 Mineral Ore Using IR, SEM-EDX, XRD, and Raman Spectroscopy IR Characterization The chromium precipitates obtained after the flux fusion step for the three different samples were initially characterized using IR spectroscopy.

Characterization and Beneficiation of Anka

2016-8-29  Chromium is largely used as alloying elements in steels for production of stainless steels. It is added in form of ferro-chromium, which is presently imported from Russia and Germany to meet the need of Nigerian

Characterization of chromite ore processing residue —

Abstract. This paper summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions, phases, and recycling potential of iron and chromium through preliminary magnetic separation. COPR from nine hazardous waste sites in Hudson County, N.J., were analyzed using nondestructive instruments including

Characterization of Kalimashi Chromite Ore (Albania) by

2021-4-19  1980). Other ore bodies occur in the more northerly massifs of Tropoja (Kam, Ragam) and Kukes (Kalima­ shi) (Pumo, 1977). Until a few years ago the extrac­ tion of chrome ore presented no particular difficul­ ties, because of the shallow depth of the mines and the high chromium grades encountered. The situa­

Minerals Free Full-Text Characterization of a Chromium

This study investigates the potential to recover iron and chromium from a chromium-bearing carbon steel Electric Arc Furnace (EAF) slag. This slag contains indeed about 30 wt.% Fe and 2.5 wt.% Cr. However, the minerals are intergrown at small scale (<100 µm) and iron and chromium are mostly contained in spinel phases which makes the separation challenging.

Chromium (VI) Retrieval from Chromium Ore Processing

2017-9-11  “Chromite ore processing residue” (COPR) is a typical waste from the chromium metal industry. Chromium production started in the first part of the nineteenth century and has been increasing ever since, particularly for use in the production of stainless steel and a wide range of other materials (Blazy and Hermant 2014).The production of chromate, a raw

Size wise chemical analysis of the chromite ore Download

2022-1-2  The ore of the study area is low grade contains 21.5% Cr 2 O 3 with the liberation size of chromite mineral in the range (0.30-0.05) mm. The

Leaching Mechanism of Cr(VI) from Chromite Ore

The leaching behavior of hexavalent chromium (Cr(VI)) and major metal elements relevant to Cr(VI) leaching from chromite ore processing residue (COPR) to HNO3 are investigated by batch leaching tests. According to the test results, aqueous Cr(VI) accounted for 70-80% of the content of total Cr. Cr(VI) concentration was controlled by the dissolution degree of Cr(VI)-bearing

Adsorption Characteristics and Transport Behavior of Cr(VI

This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1–6 m) nearby the COPR

Carburization of ferrochromium metals in chromium ore

摘要 Chromium ore fines containing coal (COFCC) can be rapidly heated by microwave to conduct the voluminal reduction, which lays a foundation of getting sponge ferrochromium powders with a lower content of C. Under the conditions of COFCC with n(O)-n(C

Characterization and Beneficiation of Anka

2016-8-29  Chromium is largely used as alloying elements in steels for production of stainless steels. It is added in form of ferro-chromium, which is presently imported from Russia and Germany to meet the need of Nigerian

Minerals Free Full-Text Characterization of a Chromium

This study investigates the potential to recover iron and chromium from a chromium-bearing carbon steel Electric Arc Furnace (EAF) slag. This slag contains indeed about 30 wt.% Fe and 2.5 wt.% Cr. However, the minerals are intergrown at small scale (<100 µm) and iron and chromium are mostly contained in spinel phases which makes the separation challenging.

Chromite ore processing residue in Hudson County, New

1991-5-1  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 ranging from

Adsorption Characteristics and Transport Behavior of Cr(VI

This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1–6 m) nearby the COPR

Heavy Metal Pollution from Gold Mines: Environmental

2016-10-26  Chromium is widely distributed in soils and rocks where it occurs in minerals such as chromite [(Fe, Mg, Al) Cr 2 O 4]. Chromium concentration ranges between 2 and 60 mg/kg in unpolluted soil but a higher concentration of 486 mg/kg was reported in gold mine tailings in Oman . Chromium is mainly found in chromate FeCr 2 O 4 having 70% of pure Cr

Carburization of ferrochromium metals in chromium ore

摘要 Chromium ore fines containing coal (COFCC) can be rapidly heated by microwave to conduct the voluminal reduction, which lays a foundation of getting sponge ferrochromium powders with a lower content of C. Under the conditions of COFCC with n(O)-n(C

Active biochar-supported iron oxides for Cr(VI) removal

Chromium (Cr), especially in forms of hexavalent chromium (Cr(VI)) remains a serious threat to public health and environmental safety for its high toxicity. Herein, two types of iron-modification methods adopting co-pyrolysis and surface-deposition respectively were carried out to prepare active Fe-biochar composites (FeBC) for Cr(VI) removal

Characteristics and environmental aspects of slag: A

2015-6-1  Characterization of the environmental aspects of slag helps to evaluate its potential to release contaminants and its suitability as a potential resource. This paper is a review of over 150 published studies on slag, and incorporates some new data generated by the authors on steel slag from the Chicago (USA) area.

研究员_中国科学院西北生态环境资源研究院油气资源研究

Stevens Institute of Technology 2005: Chromium speciation in chromite ore processing residue (COPR) investigated by using XANES spectroscopy 3. Stevens Institute of Technology 2005: Development of alternative berm media and associated best management practices for the management of firing ranges.

Discovery and characterization of UipA, a uranium- and

2021-9-23  Uranium is a naturally occurring radionuclide. Its redistribution, primarily due to human activities, can have adverse effects on human and non-human biota, which poses environmental concerns. The