Comparative Study on the Effect of Pyrophosphate and Tripolyphosphate on the Flotation Separation of Arsenopyrite and Muscovite
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Abstract:
The aim of the study was to compare the effects and mechanism of tetrasodium pyrophosphate (TSPP) and sodium tripolyphosphate (STPP) as dispersants on the selective flotation of arsenopyrite from muscovite. The results of single-mineral flotation showed that the recovery of arsenopyrite was 81.4% when no dispersant was added. The recovery of arsenopyrite slightly decreased with increasing dosage of TSPP. When the dosage of STPP was 6 × 10−5 mol/L, the recovery of arsenopyrite was only 28.6%. Neither of the dispersants had significant influence on the muscovite flotation (<10%). However, in a mixed-mineral system, the recovery of arsenopyrite dropped significantly, and then under the action of dispersants, its recovery back up. The RPM results showed that the dispersion effect of TSPP was superior to that of STPP. The electrokinetic potential showed that the potential change value of muscovite with TSPP was −17.37 mV, while that of muscovite with STPP was −8.33 mV (pH = 8). The adsorption of TSPP onto muscovite was stronger than that of STPP. FTIR and XPS analysis confirmed that dispersants exhibited chemical adsorption with the Al atoms on muscovite and that dispersant STPP exhibited stonger adsorption than TSPP on arsenopyrite, which was consistent with flotation experiments.Keywords:
Muscovite
Arsenopyrite
Tourmaline
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Muscovite
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Tourmaline
Pegmatite
Muscovite
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Partially sericitized tourmaline from a pegmatite was investigated using high-resolution transmission electron microscopy (HRTEM).Fine-grained muscovite crystals form extensive narrow veinlets preferentially developed along the {110} and {100} cleavages of tourmaline, indicating that a cleavage-controlled alteration mechanism was dominant.HRTEM images show that tourmaline-muscovite interfaces parallel well-defined {110} and {100} of tourmaline.In general, (001) of muscovite parallels the c axis of tourmaline, but otherwise tourmaline and replacing muscovite lack crystallographically oriented relationships.The muscovite consists of numerous 100 to 1000 A ˚thick subparallel packets, and the angles between (001) of muscovite and (110) of tourmaline are highly variable.Aluminous minerals other than muscovite were not observed as alteration products of tourmaline, suggesting that the tourmaline reacted directly to form muscovite; the alteration apparently involved residual fluids in which K ϩ was available and silica was not deficient.* Muscovite formula normalized to O 10 (OH) 2 .† Tourmaline formula normalized to 6 Si atoms.‡ Boron assumed to be 3 ions per formula unit.§ Total Fe reported as FeO.
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Muscovite
Pegmatite
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The Nedvědice orthogneiss is characterized by high contents of F, and B2O3, manifested by the presence of F-rich muscovite, F-rich tourmaline, and rare fluorite-tourmaline layers. Tourmaline forms subhedral grains in the orthogneiss, prismatic crystals in muscovite and fluorite-tourmaline layers in the orthogneiss. Tourmaline is also present as fine-grained layers in the muscovite layers. In our study, two types of tourmaline zoning were distinguished in the four types of studied rocks. Our results show a significant change of tourmaline composition during metamorphic recrystallization.
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Muscovite
Recrystallization (geology)
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