The role of gravity concentration in modern processing plants

Burt, R.O.

doi:10.1016/s0892-6875(99)00117-x

Cited by 69 publications

(26 citation statements)

References 1 publication

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“…Gravity concentration techniques are simple, low costs, and environmental friendly mineral processing techniques since no chemical reagents are needed [21]. Over the past few decades, the necessity of processing more complex ores displaying finer liberation meshes resulted in a decrease of the overall efficiency of classical gravity separation methods [5].…”

Section: Enhanced Gravity Concentration Using Centrifugal Separatorsmentioning

confidence: 99%

Application of Falcon Centrifuge as a Cleaner Alternative for Complex Tungsten Ore Processing

et al. 2019

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Scheelite (CaWO4) is one of the main raw material for the production of tungsten. It is usually encountered in skarn deposits where it is commonly associated with other calcium minerals as fluorite, apatite, and calcium silicates. Worldwide, scheelite is upgraded to the chemical grades by direct flotation, but the separation efficiency remains limited due to similar flotation behaviors of scheelite and gangue minerals with fatty acid. The only solutions used to overcome this issue involve high energy consumption or ecotoxic reagents. In the present study, a novel method based on the use of a centrifugal Falcon concentrator was investigated to perform an efficient elimination of gangue minerals and fine particles as well as an acceptable scheelite recovery enabling a decrease of the flotation reagents consumption. The performances of the two types of laboratory Falcon bowls, Falcon UltraFine (UF) and Falcon Semi-Batch (SB), were modeled using the design of experiments (DoE) methodology, which allowed to determine the best operating parameters for each bowl. The separation performances were mainly affected by the rotary speed and the pulp density for the Falcon UF and by the rotary speed and the fluidization pressure for the Falcon SB. Due to the fluidization pressure, the Falcon SB exhibited higher gangue minerals rejection with slightly lower recoveries than the Falcon UF. Overall, the optimized Falcon SB test allowed to reach 71.6%, 22.6%, 17.2%, and 12.6% for scheelite, calcium salts, dense calcium silicates, and light non-calcic silicates respectively while the desliming efficiency reached 98.8%. For comparison purposes, a classical hydrocyclone allowed to attain 89.1%, 89.3%, 79.5%, and 76.5% for scheelite, calcium salts, dense calcium silicates, and light non-calcic silicates respectively while the desliming efficiency reached 52.0%. Theses results can be used reliably to assess the separation performances of an industrial Falcon C which can be regarded, along with Falcon SB, as a sustainable and efficient gangue rejection method for complex W skarn ore, which allows the use of environmentally friendly reagents during downstream flotation stages.

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Section: Enhanced Gravity Concentration Using Centrifugal Separatorsmentioning

confidence: 99%

Application of Falcon Centrifuge as a Cleaner Alternative for Complex Tungsten Ore Processing

et al. 2019

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“…6a-f), meaning that this ore is not suitable for froth flotation processing (O'Connor and Dunne, 1994;Matis, 1995). In addition, native gold and electrum are generally present as very small elongate interstitial fill within pyrite, meaning that gravity concentration processing is unsuitable in this case (Burt, 1999).…”

Section: Native Gold and Electrummentioning

confidence: 99%

Electron microprobe analyses of ore minerals and H–O, S isotope geochemistry of the Yuerya gold deposit, eastern Hebei, China: Implications for ore genesis and mineralization

Kong

Yin

et al. 2015

Ore Geology Reviews

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“…Gravity concentration has been accepted as a low-cost and an environmental-friendly process for the separation of minerals (Richards et al 2000). The gravimetric separation is the result of relative movement between two or more minerals in response to gravity and one or more other forces (Burt 1999). However, particle gravity separation is difficult for particle sizes below 0.100 mm (Galvin et al 2010;Traore et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Iron recovery from the waste generated during the cutting of granite

Junca

Oliveira

Espinosa

et al. 2013

Int. J. Environ. Sci. Technol.

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Metallic iron is present in the waste left when granite blocks are cut. Thus, the purpose of this study was to characterize this waste using chemical and particle size analyses. To achieve this, X-ray diffraction and scanning electron microscopy coupled with electron back-scattered diffraction were used. To find the method with the best metallic iron recovery from the waste of ornamental rock, three distinct methods were examined: magnetic separation, table concentration and cyclone processing. The first method involved three steps: (1) use of a wet high-intensity magnetic separator, where only the equipment's remaining magnetic field was present; (2) the material from the first step was then submitted to separation again, this time using a magnet for rare earth particles; and (3) this material after two separation processes was finally submitted to ferromagnetic separation. The second method used a concentration table set at various inclinations, oscillation frequencies and wash flow rates. Meanwhile, for the third method, the cyclone tests, only the water pressure was varied. After each test, a chemical analysis was performed to determine the metallic iron present in each sample. The tests revealed that magnetic separation presents the best results. Using this technique, a ferrous concentrate with 93 % metallic iron content and a granite concentrate with only 0.6 % metallic iron were obtained. On the other hand, in the table concentrator tests, the ferrous concentrate only had a metallic concentration of 13.6 %. In separation by the cyclone processing, the product barely contained metallic iron (7.2 % maximum).

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The role of gravity concentration in modern processing plants

Cited by 69 publications

References 1 publication

Application of Falcon Centrifuge as a Cleaner Alternative for Complex Tungsten Ore Processing

Application of Falcon Centrifuge as a Cleaner Alternative for Complex Tungsten Ore Processing

Electron microprobe analyses of ore minerals and H–O, S isotope geochemistry of the Yuerya gold deposit, eastern Hebei, China: Implications for ore genesis and mineralization

Iron recovery from the waste generated during the cutting of granite

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