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Abstract. A high percentage of high-ash fine slime materials can deteriorate flotation selectivity through surface covering. This covering of the surface is one of the …
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The decarburization sample of stone coal was well mixed and divided into 200 g samples for quartz flotation, while NaOH and H 2 SO 4 were the modifiers, sodium silicate was the inhibitor, Fm EDA-C was the collector, and neutral oil (2# oil) was the ing agent. The decarburization sample flotation was conducted in a single flotation …
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Sodium silicate is a depressant extensively used in coal flotation to depress quartz and silicate gangue minerals [11,12]. However, high dosage and unstable depression limit its industrial application. ... to ionize in aqueous solutions and produces active anions to form colloidal complexions or chelate with divalent metal ions (such as Ca 2 ...
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In the flotation of gas coal using sodium chloride solution, when the content of chloride ions is 4–6 g/L, significant increase is noted in the concentrate yield, the ash content of the waste, and the extraction of combustible mass in the concentrate, with small decrease in concentrate quality but considerable decrease in the consumption of ...
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Coal flotation is the most proficient technique used to improve the nature of fine particles by diminishing pollution substance (Majumder and Barnwal, 2011). The hypothesis of froth flotation is complex and has not been fully comprehended. This reality has been brought by many difficulties observed in coal preparation plants (Ye et al., 2017).
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The ion flotation process showed low-energy consumption, limited volume demands, reduced sludge volumes, and selective treatment 96. The precipitation flotation process is basically a chemical ...
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Using 6×10 -5 M EDTA together with 2.5×10 -4 M octanohydroxamic acid and 0.05 g/L sodium silicate, monazite recovery of more than 90% was achieved while only recovering 20% of calcite. Based on the fundamental study, rare earth concentrates with 4700 ppm of REEs were produced from the Fire Clay fine coal refuse using column …
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In the present work, the salt flotation technique has been tested with 27 different inorganic electrolytes on two high ash coal samples. The performance of various salt solutions were compared in terms of the separation efficiency. At an arbitrary concentration of 0.07 moles/liter, the best results were obtained with CuSO/sub 4/ at 68 percent separation …
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Xing et al. [148, 149] studied the effect of calcium ions on coal flotation in the presence of kaolinite clay. The interaction force between coal and kaolinite was measured using AFM (Fig. 11
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The tetrahedral layer is negatively charged due to isomorphic substitution of about 1/4 of the Si 4+ ions by Al 3+ ions. ... Flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and presence of Dowfroth 250. Int. J. Miner. Process., 98 (2011), pp. 137-144.
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effective than monovalent ions in the flotation of heat‐treated coals in salt solutions. Zheng et al. [29] Na+, Mg2+, Ca2+ Anthracite coal Only divalent ions of Ca2+ and Mg2+ significantly compressed the double electrical layer and en‐ hanced the attachment between bubbles and coal particles
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Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species …
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In some cases, carrier flotation might be used. Oil agglomeration [85, 86]-another kind of surface-based separation technique-is appropriate for ultra-fine coal cleaning when flotation is ...
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iron (II) and (III) ions had little effect on the flotation ofclean coal in the presence of a hydrocarbon collector, but coal flotation was depressed without a collector. The objective ofthe present study was to identify special reagents that spec ifically render the pyrite surface hydro ph ilic. Various kinds of organic and inorganic depressants
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Experiments show that coal flotation in the presence of sodium chloride (chloride-ion concentration 4–6 g/L) significantly increases the yield of concentrate, its …
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salt ions available in water can enhance coal flotation. Since the researchers (Majer et al., 1934) discovered in 1934 that that coal could be floated with the increase in salt
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EFFECT OF MULTIVALENT IONS ON COAL FLOTATION 385 scintillation counter. While the released iron was measured by atomic absorption. the released and adsorbed aluminum were measured by colorimetry using aluminon at 535 nm. All chemicals used in this study were of ACS Fisher certified grade, and solutions were prepared using triple distilled water.
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The induction time has been shown to correlate well with the corresponding recovery in coal flotation. To assess the coal floatability in a dynamic flotation system, the induction time is a better numerical characteristic than the wetting angle . The floatability of coal with different density—1.4; 1.4–1.6 and higher than 1.6 g/cm 3 was ...
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A classification of flotation processes carried out in concentrated electrolyte solutions, e.g., seawater, is proposed using the most obvious features of these processes: low or high content of Mg 2+ and Ca 2+ ions, pulp ionic strength, and pH. The first distinguishable group is the processes carried out in NaCl/KCl solutions, about 0.5 M in …
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The microflotation of three single minerals, mixed coal–kaolinite and mixed coal–montmorillonite were examined to study the effects of clay and calcium ions on …
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1. Introduction. Flotation is a practical technology to realize the separation of aimed minerals and gangue in fine-grained minerals based on the difference in mineral surface properties, and it has been widely applied in the separation of coal, metal, and nonmetallic minerals [1].The mineral adhere to the bubbles firmly is the premise of …
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This trend can be attributed to the replacement of hydrogen ions (H+) by hydroxide ions (OH-) on the coal surface, resulting in an increase in negative charge. ... M. Coal flotation using a biosurfactant …
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Particle-bubble attachment is an essential step for a successful flotation; the induction time is defined as the minimum contact time required for particle-bubble attachment in a solution. A novel induction timer was built to investigate the effect of calcium ions on induction time between the coal particle and air bubble. The induction-time …
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The flotation results showed that 90% of the coal particles float within 1 min which suggests rapid flotation kinetics in the presence of salt ions. These results also indicated that a poor flotation response for particles coarser than 0.106 mm.
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A study on the mechanism of calcium ion in promoting the sedimentation of illite particles. Author links open overlay panel Xiaohui Yan a, Lubin Wei a, Qi Meng a, Jian Wang b, Qi Yang a ... Effects of clay species on coal flotation under the cationic regulation. Chem. Phys. Lett., 753 (2020), Article 137626, 10.1016/j.cplett.2020.137626. View ...
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2.1 Potential-Determining Ions. The surface charge in systems of importance to mineral processing may arise from a variety of different sources. In the case of ionic solids, such as BaSO 4, CaF 2, CaCO 3, and AgI, the surface charge arises from a preference of one of the lattice ions for sites at the solid surface in comparison to the …
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In flotation, certain ions are considered as "structure breaking", ... Laskowski (1965) conducted coal flotation using inorganic salts (NaCl and KCl) and proposed that the electrical double layer around the particles was compressed, resulting in the opening of hydrophobic surface sites. The sites may then attract bubbles by hydrophobic bonding.
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The effect of these multivalent ions on coal flotation has been investigated, the result of which shows that multivalent electrolytes depress coal flotation in the pH region of metal hydroxide precipitation (Celik and Somasundaran, 1986, Rao and Finch, 1989, Somasundaran et al., 2000).
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In many mineral processing plants, using saline water has become necessary to improve water efficiency. However, the dissolved ions in the water such as Ca 2+ and Mg 2+ may have a significant negative impact on the flotation of RE (rare earth) minerals due to the chemical reaction with flotation reagents used in RE flotation. Although some …
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The enhancement of coal and graphite flotation by salt ions depends on the salt type and concentration. Multivalent Mg 2+, Ca 2+, and La 3+ significantly improved the floatability of coal and graphite at lower salt concentrations. Bubble coalescence in salt solutions seems to be a significant factor in coal flotation in saline water.
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