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Nov 01, 2019· The Musoshi concentrator, which is currently out of use and partially dismantled, was operated by the “Société de DévéloppementMinière du Congo” (SODIMICO), previously owned by the Japanese consortium led byNippon Mining(Takeushi et al., 1986, pp. 129–130), was processing mixed ores with Cu occurring as chalcopyrite,bornite, cuprite,malachite, chalcocite and azurite
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A pneumatic table concentrator a mobile pilot-scale unit of the FGX Separator was evaluated in the clean of lignite sub-bituminous and bituminous coals . As shown in Fig. 6 the FGX dry cleaning system includes the separation principles of both an autogenous medium and a table concentrator. The separating compartment consists of a deck
The table& 39;s collection boxes for concentrates middlings and tailings provide for the dry recovery of materials if required. The tables are available in three ranges: the smallest a 0.25 kW machine with a surface area of 0.25 m.sup.2 is suitable for laboratory use; a larger 0.35 kW model
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By Lisa Zyga , Phys.org
Scientists from Spectrolab, Inc., a subsidiary of Boeing, have recently published their research on the fabrication of solar cells that surpass the 40% efficiency milestone—the highest efficiency achieved for any photovoltaic device. Their results appear in a recent edition of Applied Physics Letters.
Most conventional solar cells used in today’s applications, such as for supplemental power for homes and buildings, are one-sun, single-junction silicon cells that use only the light intensity that the sun produces naturally, and have optimal efficiency for a relatively narrow range of photon energies.
The Spectrolab group experimented with concentrator multijunction solar cells that use high intensities of sunlight, the equivalent of 100s of suns, concentrated by lenses or mirrors. Significantly, the multijunction cells can also use the broad range of wavelengths in sunlight much more efficiently than single-junction cells.
"These results are particularly encouraging since they were achieved using a new class of metamorphic semiconductor materials, allowing much greater freedom in multijunction cell design for optimal conversion of the solar spectrum," Dr. Richard R. King, principal investigator of the high efficiency solar cell research and development effort, told PhysOrg.com. "The excellent performance of these materials hints at still higher efficiency in future solar cells."
In the design, multijunction cells divide the broad solar spectrum into three smaller sections by using three subcell band gaps. Each of the subcells can capture a different wavelength range of light, enabling each subcell to efficiently convert that light into electricity. With their conversion efficiency measured at 40.7%, the metamorphic multijunction concentrator cells surpass the theoretical limit of 37% of single-junction cells at 1000 suns, due to their multijunction structure.
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