e traction of chromium from a chromiuore

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E Traction Of Chromium From A Chromiuore

Extraction Of Chromium From A Chromium Ore - Mining . Extraction of chromium from a chromium ore. Extraction of Chromium from Chromite Ore.Extraction Chromite FeCr 2 O 4 is the most commercially useful ore and is extensivelyused for extraction of chromiumChromium is produced in two forms Chemistry of the

Extraction of Chromium from Chromite Ore

Chemical analyses of the ores used for the research are shown in table 1. The calculated chromite heads in subsequent tables, although not in perfect agreement with head assays, show that the tests are within experimental error and the assay variations on the feed materials. A petrographic examination of the Auburn ore showed that it contains major amounts of epidote, chlorite, and serpentine, with minor amounts of calcite, enstatite, chromite, magnetite, hematite, and olivine. Examination of the ores from the Seiad Creek area showed the following minerals and the estimated volume-percent of each constituent: The chromite grains in both samples were essentially liberated from the gangue at 100 mesh, although chromite was still locked with magnetite particles as small as 400 mesh. Both samples also contained fibrous structured minerals that may present environmental and/or health problems in the event of commercial mining and/or processing. See full list on 911metallurgist.com 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 beneficiationtechniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report. Tabling of the ore followed by upgrading the tabled chromite concentrate using magnetic separation to remove magnetite gave far superior results. The results and discussion of gravity-magnetic separation tests on the Auburn ore follow. See full list on 911metallurgist.com Two samples of ore containing about 6 pct Cr2O3 were obtained from a core drilling operation in the Seiad Creek area of northern California. Two table concentration tests were made on each sample, one dry crushed to minus 35 mesh, and the other dry crushed to minus 100 mesh. In each test a rougher concentrate was recovered and then retabled. The results, given in tables 13 and 14, show that both samples responded in about the same manner. When tabling the minus 35-mesh material, a concentrate was produced from each ore sample that assayed about 47 pct Cr2O3 with a recovery of 60 pct, and a Cr:Fe ratio of 1.9:1 to 2.0:1. The concentrates obtained from both the minus 100- mesh feeds assayed about 50 pct Cr2O3, but showed a decrease in recovery from 60 to about 50 pct with no change in the Cr:Fe ratio. The nickel concentrations remained nearly constant (about 0.2 pct) in all products. See full list on 911metallurgist.com The combination of tabling and magnetic separation of a 2.5-pct-Cr2O3 ore from Auburn, Calif., resulted in a concentrate containing about 45 pct Cr2O3 with a chromium-to-iron ratio of 1.6:1, a product well suited to chemical use. The cleaner concentrate obtained by tabling the 5- and 6-pct-Cr2O3 ores from the Seiad Creek area in northern California contained from 47 to 49 pct Cr2O3 with a chromium-to-iron ratio of 1.9:1 to 2.0:1. The recoveries from both these ores were low, but the concentrates are suitable for metallurgical and/or chemical use and the grades compare favorably with those of imported chromite. See full list on 911metallurgist.com extraction of chromium by an oxidizing roast of chromite ore extraction of chromium from ore. Chromium Chemistry Chromium is the earth's 21 st most abundant element (about 122 ppm) is the most commercially useful ore, and People also ask How is chromium extracted from crushed chromite ore? Approximately 150 pounds of ore were stage crushed with rolls to minus 35 mesh, then blended and sampled for screen analysis. The results of the screen analysis, given in table 2, show that 48.3 pct passed 100 mesh, the point of chromite liberation. Extraction of Chromium from Chromite Ore

Process of extracting chromium from a chromium ore or concentrate by oxidation, which comprises suspending the chromium ore or concentrate in a bath of molten salts and introducing an oxygen-containing gas into the suspension in a sufficient amount and for a sufficient amount of time to oxidize chromium therein. Author: Roland BachelardCited by: 3Publish Year: 1975 The process used for the extraction of chromium ore is required to increase the recovery rate of chromium. Generally, the common process used for the extraction of chromium ore mainly includes single gravity separation, single magnetic separation, or gravity separation-magnetic separation combined process. Underground mining of the chromium ore is employed when the ore of the chromium is present in the greater depths. The ore in the underground is either accessed through open pit mining or it is carried through different techniques like shaft, tunnel or room and pillar method. Other techniques to extract the ore of the chromium are blastholestoping method. When the surrounding rock of the chromite is hard for the removal process, this method is carried to break the rocks. Ferrochromium is the