Depression of Pyrite in Seawater Flotation by Guar Gum
Autor: | Ricardo I. Jeldres, Pedro Robles, Norman Toro, Alejandro Lopez-Valdivieso, Eder C. Piceros, César I. Castellón |
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Rok vydání: | 2020 |
Předmět: |
lcsh:TN1-997
fbrm pyrite depression medicine.drug_class Potassium 0211 other engineering and technologies chemistry.chemical_element FBRM 02 engineering and technology engineering.material Polysaccharide chemistry.chemical_compound medicine guar gum General Materials Science seawater flotation lcsh:Mining engineering. Metallurgy 021102 mining & metallurgy chemistry.chemical_classification Guar gum Metals and Alloys 021001 nanoscience & nanotechnology Copper sulfide chemistry engineering Seawater Depressant Pyrite Xanthate 0210 nano-technology Nuclear chemistry |
Zdroj: | Metals, Vol 10, Iss 2, p 239 (2020) Metals Volume 10 Issue 2 |
ISSN: | 2075-4701 |
Popis: | The application of guar gum for pyrite depression in seawater flotation was assessed through microflotation tests, Focused Beam Reflectance Measurements (FBRM), and Particle Vision Measurements (PVM). Potassium amyl xanthate (PAX) and methyl isobutyl carbinol (MIBC) were used as collector and frother, respectively. Chemical species on the pyrite surface were characterized by Fourier-transform infrared spectroscopy (FTIR) spectroscopy. The microflotation tests were performed at pH 8, which is the pH at the copper sulfide processing plants that operate with seawater. Pyrite flotation recovery was correlated with FBRM and PVM characterization to delineate the pyrite depression mechanisms by the guar gum. The high flotation recovery of pyrite with PAX was significantly lowered by guar gum, indicating that this polysaccharide could be used as an effective depressant in flotation with sea water. FTIR analysis showed that PAX and guar gum co-adsorbed on the pyrite surface, but the highly hydrophilic nature of the guar gum embedded the hydrophobicity due to the PAX. FBRM and PVM revealed that the guar gum promoted the formation of flocs whose size depended on the addition of guar gum and PAX. It is proposed that the highest pyrite depression occurred not only because of the hydrophilicity induced by the guar gum, but also due to the formation of large flocs, which could not be transported by the bubbles to the froth phase. Furthermore, it is shown that an overdose of guar gum hindered the depression effect due to redispersion of the flocs. |
Databáze: | OpenAIRE |
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