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collecting X-ray data at each grid point when minerals have similarly bright BSE images (Fandrich R. et al., 2007). The seven basic measurement modes are listed (Fandrich R. et al., 2007): 1. Standard BSE liberation analysis (BSE). 2. Extended BSE liberation analysis (XBSE). 3. Sparse liberation analysis (SPL). 4. Particle X-ray mapping (PXMAP). 5. Selected particle X-ray mapping (SXMAP). 6. X-ray modal analysis (XMOD). 7. Rare phase search (RPS). 4.1.2 Quantitative Evaluation of Minerals by Scanning Electron Microscope (QEMSCAN) The QEMSCAN at Mines is a fully automated micro-analysis system performed with a Carl Zeiss EVO 50 Scanning Electron Microscope (SEM) combined with four Bruker X275HR silicon drift X-ray detectors, and the iMeasure-iDiscover ® software is employed to process all analytical information. The QEMSCAN provides bulk modal analysis, particle maps, locked and liberated textual analysis, size-by-size and mineral-by-mineral chemical assay, and trace mineral search. The particle map is also capable of determining grain and particle sizes, shape factors, particle types, and proportions of mineral species present in the sample. A sample mineralogy is obtained by the measured back-scattered electrons (BSE) and energy dispersive (EDS) X-ray spectra. To be specific, a BSE scan is performed to locate mineral particles, followed by an EDS analysis. The EDS spectrum is analyzed by windowing, background subtraction, overlap correction, thresholding, and the calculation of peak ratios (Gottlieb P. et al. 2000). 4.1.3 Atomic Absorption Spectroscopy An atomic absorption spectroscopy, PerkinElmer AAnalyst 400, is used in this study to measure the concentration of atoms in an aqueous sample in the parts-per-million range based on their ability to absorb light at a specific wavelength, because the tolerance of total dissolved solids is higher than ICP-MS. Generally, atomic absorption spectroscopy consists of a light source, an atomizer, a monochromator and a detector. An aqueous sample is introduced into the atomizer to 35PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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