A Sorting System for Aluminum Alloy Scrap Based on Laser-Induced Breakdown Spectroscopy
Issue:
Volume 7, Issue 3, May 2019
Pages:
65-71
Received:
28 May 2019
Accepted:
3 July 2019
Published:
13 July 2019
Abstract: A sorting system for aluminum scrap using laser-induced breakdown spectroscopy (LIBS) has been developed, which employs the sequential sample cells that are moved by the electric actuator in order to carry scrap pieces. A combination of a Q-switched Nd: YAG laser (30mJ, 10ns) with an objective lens having a long focal length of 600 mm were used to generate plasmas, and the emitted light was analyzed spectroscopically by a compact fiber-optic spectrometer having a CCD array detector. A pulse generator was constructed in order to synchronize the laser pulse, the CCD spectrometer and the electric actuator. The elemental composition of aluminum alloy scrap was determined by the calibration curves obtained by analyzing the standard aluminum alloy samples. The sorting algorithm based on the difference of the concentration of main additional elements of aluminum alloy was proposed. The developed LIBS sorting system was applied for the analysis of aluminum alloy samples and complete classification and separation of cast and wrought aluminum alloys into specific alloy groups was achieved.
Abstract: A sorting system for aluminum scrap using laser-induced breakdown spectroscopy (LIBS) has been developed, which employs the sequential sample cells that are moved by the electric actuator in order to carry scrap pieces. A combination of a Q-switched Nd: YAG laser (30mJ, 10ns) with an objective lens having a long focal length of 600 mm were used to ...
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Experimental Modeling of the Formation of the Metallic Core of the Moon by the Method of High-Temperature Centrifuges
Lebedev Evgeny Borisovich,
Averin Viacheslav Vasilyevich,
Lukanin Oleg Alexandrovich
Issue:
Volume 7, Issue 3, May 2019
Pages:
72-75
Received:
23 June 2019
Accepted:
27 July 2019
Published:
13 August 2019
Abstract: At early stages of the formation of planetary bodies, silicate, metallic, and sulfide phases, which have been formed in the course of the partial or complete fusion of the initial planetary substance, were subject to a gravitational differentiation. The latter is related to the separation of the crystalline and molten phases in density and composition. Althose in recent years a number of papers deal with the experimental and theoretical determination of the processes of the percalation of metallic melts through the crystalline silicate matrix and the physical properties of the metallic and sulfide melts. For the Moon, the problem of the existence of the metallic or sulfide core still remains unsolved. There is stil the nessity of further investigation in this direction. The possible origin of the Moon’s metallic core at the precipitation of iron-sulfide phases during the partial melting of ultramafic material under various redox conditions was experimentally modeled by partially melting the model system olivine (85 wt %)+ ferrobasalt (10 wt %)+ metallic phase Fe95S5 (5 wt %) in a high-temperature centrifuge at 1430-1450°C.
Abstract: At early stages of the formation of planetary bodies, silicate, metallic, and sulfide phases, which have been formed in the course of the partial or complete fusion of the initial planetary substance, were subject to a gravitational differentiation. The latter is related to the separation of the crystalline and molten phases in density and composit...
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