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optimum mesh of grind chromite

optimum mesh of grind chromite

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.

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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.

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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 in all products.

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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.

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