This study investigates the hydrophobic aggregation of fine quartz particles through shear flocculation induced by dodecylamine in aqueous solutions. The effect of stirring speed, collector concentration, flocculation time, and pH were investigated. The results showed that the impact of stirring speed on particle aggregation in the absence of …Web
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This paper studies in a detailed manner the selective flocculation and flotation of fine hematite with the PAAS to separate the fine hematite from quartz using NaOL as the collector and probes deeply the mechanism for interaction between the PAAS and hematite. 2. Materials and methods. 2.1. Samples and reagents.Web
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Flocculation studies on iron-ore fines (size < 10 μm) were conducted using three anionic polyacrylamide polymers over the pH range 4.0–10.0 and flocculant dosages up to 0.20 kg/ton.The flocculation was favourable under acidic conditions and was helped substantially by CaCl 2 additions in alkaline conditions. Zeta potential measurements …Web
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Fig. 2 expresses the flocculation results of molybdenite, chalcopyrite and quartz. In the absence of PADD, the molybdenite, chalcopyrite and quartz suspensions had good dispersibility, as shown in tubes 1, 3 and 5 in Fig. 2 (a) and 2(b, d and f) are their fluorescence microscope images, respectively. The three minerals uniformly dispersed …Web
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The flocculation responses for single mineral suspensions of hematite and quartz are shown in Fig. 6 as a function of concentration of sodium polystyrenesulfonate. The percentage of hematite settling in 45 sec is higher thamthat for quartz and the results suggest that separation of hematite from quartz by selective flocculation should be ...Web
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Ultra flocculation of quartz suspensions: effects of shear rate, particle size distribution and solids content. N. Rulyov V. Korolyov N. Kovalchuk. Materials Science. 2009; Abstract The process of ultra flocculation of fine quartz suspensions with a cationic flocculant has been studied.Web
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This paper reports the results of studies on flocculation and dewatering of kaolin suspensions by anionic polyacrylamide (PAM-A) flocculant in the presence of surfactants. They were namely anionic Sodium Dodecyl Sulphate (SDS), cationic Cetyl Trimethyl Ammonium Bromide (CTAB) and a non-ionic surfactant of polyoxyethylenic …Web
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Flocculation of fine hematite and quartz suspensions with anionic cellulose nanofibers ... cellulose nanofibers in flocculating fine hematite and quartz particles. Flocculation was studied at pH ...Web
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Moreover, the flocculation, de-flocculation and re-flocculation of molybdenite and quartz particles with different stirring speeds were investigated and the results are shown in Fig. 11. Upon adding PEO to the molybdenite suspensions, the particle size increased rapidly within a very short time and reached the maximum size value at …Web
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FLOCCULATION WITH POLYMERS 7.1 INTRODUCTION For several decades both natural and synthetic water soluble polymers have been used as flocculents, dispersants, thickeners, flotation depressants, filtration and settling aids throughout a wide range of industries (i.e. mineral, paper, effluent, textile, food). This versatility is due to the …Web
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This study investigates the hydrophobic aggregation of fine quartz particles through shear flocculation induced by dodecylamine in aqueous solutions. The effect of …Web
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This work investigated the hydrophobic flocculation of cassiterite using four alkyl hydroxamic acids with varying carbon chain lengths, i.e., hexyl hydroxamate (C6), octyl hydroxamate (C8), decyl hydroxamate (C10) and dodecyl hydroxamate (C12), as collectors. Microflotation tests were performed to investigate the flotation behaviour of cassiterite in …Web
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Abstract The process of ultra flocculation of fine quartz suspensions with a cationic flocculant has been studied. The influence of several variables such as quartz …Web
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For inorganic clay suspensions, the properties of the inorganic clay minerals determine their flocculation and dewatering behaviours. ... Rigaku, Japan) results, the purity of Kaolinite in samples can reach 96.5%; other minerals have a small amount of quartz, illite, and other impurities. The moisture content, specific resistance to filtration ...Web
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The flocculation behaviour was characterised in terms of both flocculation kinetics and the corresponding morphology changes during flocculation. Both Chi-g-CPAM and CPAM were grafted from silica wafers by means of atom transfer radical polymerization (ATRP). The quartz crystal microbalance with dissipation (QCM-D) tests were conducted.Web
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It has been shown that the fine quartz suspensions (quartz particle diameter <5 μm) can be effectively flocculated in high non-uniform hydrodynamic fields (mean …Web
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Abstract and Figures. Real life example ultra-flocculation testing on coal concentrator's tailings shows that hydrodynamic treatment of mineral suspensions in strongly non-uniform hydrodynamic ...Web
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The images of the flocculation investigation with the silica suspension show light white and turbid suspensions as flocculation series with a flocculation window in the middle of the series where the solution becomes clear due to sedimentation of the mixture of silica-PEL. ... Maruyama, H.; Seki, H.; Igi, A. Flocculation of quartz and kaolin by ...Web
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The flocculation behavior of coal, quartz and clay was studied by measuring the turbidity of the supernatant liquid after one hour of settling. Figure 14 is a plot of turbidity and adsorption density against equilibrium concentration. ... When salt is added to these suspensions, the double layer is compressed and flocculation by bridging is ...Web
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Flocculation was studied on model suspensions of kaolin. Kaolin is a type of white clay that consists of silicon oxides (30–70%) and aluminum (10–40%). Kaolin particles mostly have a negative charge due to the presence of silanol groups in the surface layer. Average particle size (radius) of the suspensions kaolin was 9 μm.Web
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The process of ultra flocculation of fine quartz suspensions with a cationic flocculant has been studied. The influence of several variables such as quartz particle …Web
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Flocculation of gangue mineral suspensions such as quartz and kaolin in seawater at pH 11 at any dose of flocculant is noticeably reduced compared to the same tests at pH 8. The difference is the appearance of Mg(OH) 2 precipitate at pH 11 which effectively competes for the flocculant. The magnesium hydroxide blocks the active sites …Web
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In this study, nine variables of ultrafine quartz flocculation systems, defined in Part 1 of this study, were analysed. ... KITCHENER, J. A. Role of surface silanol groups in the flocculation of silica suspensions by polyacrylamide. Part 1. Chemistry of the adsorption process. Transactions of the Faraday Society, v. 61, p. 1026-1031, 1965.Web
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Synthetic tailings were prepared from mixtures of quartz and kaolin in different proportions. The quartz particles were available in our lab (XRD in Figure 1 a) and the kaolin was procured from Ward's Science (Rochester, NY, USA). The kaolin composition included mainly kaolinite and halite and a small proportion of SiO 2 (XRD in Figure 1 b). …Web
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Fig. 5 shows the shear flocculation of quartz with sodium oleate as a function of pH in the presence of calcium and magnesium ions. As seen from Fig. 5, the sedimentation of the suspension was not much assisted by the cations and sodium oleate at pH 8 and 9. However, the shear flocculation of quartz increased with increasing pH …Web
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Research was undertaken to investigate the efficiency of anionic dicarboxylic acid (DCC) and sulfonated (ADAC) cellulose nanofibers in flocculating fine hematite and quartz particles. Flocculation ...Web
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Different PAMs exhibited diverse flocculation effects on chlorite and quartz, whereas only the combination of anionic PAM and calcium ions flocculated them effectively and simultaneously. Results from zeta potential and Fourier-transform infrared spectroscopy (FTIR) measurements suggested that flocculation was mainly affected by the affinity ...Web
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Quartz dispersionsAdding non-adsorbing polymers to suspensions depletion and viscosity effects occur simultaneously. At lower polymer concentration the depletion effect will induce weak flocculation, which might be absent at higher polymer concentration (depletion stabilisation) [1]. On the other hand the associated increase in …Web
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Abstract Research was undertaken to investigate the efficiency of anionic dicarboxylic acid (DCC) and sulfonated (ADAC) cellulose nanofibers in flocculating fine …Web
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Flocculation is a complex process, normally carried out under conditions that are constantly varying. The effectiveness of the process depends not only on the use of appropriate chemical reagents (coagulants, flocculants, ... calcite and quartz suspensions. Int Miner Process, 59 (2000), pp. 89-112. View PDF View article View in Scopus Google ...Web
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This work aimed to evaluate the performance of anionic nanocelluloses as flocculation agents for pure hematite and quartz suspensions. In the present research …Web
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The absorbance of the sample was measured at 700 nm spectrophotometrically. The flocculation efficiency was evaluated with the relative absorbance, A/A 0, where A and A 0 represent the absorbance of the suspensions in the presence and the absence of flocculant, respectively. Most of the clarification …Web
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The zeta potential was measured by the streaming potential method (Fuerstenau, 1953) and the effectiveness of the dispersion or flocculation of the quartz suspensions was determined by weighing the mineral slimes dis- persed in the upper 5 ml of the suspensions after 5 minutes of settling in a calibrated flask.Web
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In seeking to better understand the inline flocculation technique for enhanced water recovery from concentrated fine-particle suspensions, polymers of different molecular weight (MW) and chemistry were used to treat a synthetic tailings slurry in a low-shear mixer for continuous flocculation under controlled conditions.Web
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