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The application of the centrifugal concentration gains importance in the world scenario, considering the low environmental impact and the concentration of fine particles. Literature does not present articles using centrifugal concentration (Falcon) for chromite. The material used in the tests is the tailings from a Northeastern Brazil concentration plant, which was homogenized in the laboratory. In the process assays, the number of G (25-300 G) and the fluidization water pressure (20-100 kPa) were optimized. The initial tests used a wide range of particle size of 1 kg mass, with the 'best results' being for 50 and 100 G at a pressure of 60 and 80 kPa, respectively, where a metallurgical recovery of 25% and grade close to 20% of Cr 2O 3 were obtained. The amount of mass showed to be a significant variable in the process, being 250 g the ideal for the material used, which obtained considerable recoveries, even though the grade is still low.
These results led to a cut at 250 µm, considering that the liberation of the chromite is of the order of 77%. The best result was with 150 G and fluidization water pressure of 60 kPa for a metallurgical recovery of 72% and a grade of 28% Cr 2O 3.
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Keywords: centrifugal concentrator; Falcon; chromite; tailings. Introduction Chromium minerals are found on Earth under the form of oxides and silicates. However, chromite is the only chromium mineral with an economically viable production, which gives it an outstanding position in the mineral industry.
Its theoretical composition is 68% Cr 2O 3 and 32% FeO: however, these grades are never found in nature, due to the existence of contaminations. Chromite is one of the most important industrial minerals: It is used in the metallurgical (main consumption), refractory, chemical and foundry industries. It was first used as a pigment in the late eighteenth century. In the early nineteenth century, it was discovered that this mineral provided stainless properties to the alloy steels ( ). Centrifugal concentrators are machines that emerged in the 80's and exert a high centrifugal force, which can be used for a retraction of tailings of heavy minerals such as chromite, gold, scheelite, among others, making better use of the mineral concentrate.
They have relatively low operating and equipment costs, as stated. Falcon applications can be found in literature. Initially, centrifugal concentrator application was restricted to the concentration of gold. Carried out experiments with this ore in a region of Pedra Lavrada-PB, reaching concentrations around 82%. Also, verified that Falcon was able to recover fine particles of gold (- 74 µm) in the order of 44% in 30 minutes of operation in sulfide ore (17% pyrite and 2% chalcopyrite).