Kaolinite deposition from moving suspensions: The roles of flocculation ...
SSC decline curves are very valuable for evaluating the flocculation behaviour of moving suspensions of clays and other fine-grained materials. Derived critical velocities of sedimentation match those gathered from floccule imaging and require significantly less effort to acquire. ... (quartz, feldspar, etc.), will hinge on the ability to ...
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Flocculation of clay suspensions separated from soils of different soil ...
The flocculation of clay suspensions by various electrolytes has been well studied (1, 6, 7). In general, flocculation by inert electrolytes is governed ... Quartz porphyry Granite Pleistocene sediments Pleistocene sediments Paleozoic schist Pleistocene sediments Amphibolite (metamorphic) Pleistocene sediments Dacite Tertiary siltstones &
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Flocculation Dynamics of Mud: Sand Mixed Suspensions
Parameterised data indicated that by adding more sand to a mud:sand mixture, the settling velocity of the macrofloc fraction slows and the settling velocity of microflocs (sizes < 160 μm) increases. In terms of floc composition, effective density data of many of the microfloc fractions ranged between 800-1200 kg.m -3.
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SciELO - Brasil - Ultrafine quartz flocculation: Part I. System ...
A characterization study was performed to verify the more relevant physicochemical properties for quartz flocculation with polyacrylamide, as well as to define which variables should be further investigated regarding this flocculation system. ... flocculation addition time, agitation intensity, pH of the suspension, flocculation time, and solid ...
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Evaluation of flocculation performance of polysaccharide-protamine ...
The concentration of quartz suspension was 3.0 g/L. At around the neutral pH (pH 6.5–7.5), protamine which is a basic protein has a positive charge, ... Model parameters estimated from model calculation of quartz suspension flocculation by polysaccharide-protamine complex flocculant.
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P. 5aIB-~ - Columbia University
flocculation characteristics of quartz suspen-.ions. In these tests, the percentage ot light transmitted through the supernatant of a sus-pension is _asured; higher percentage trans-ai.sion indicates reduced dispers~on. (4) Torque _asurements on an impeller stir-rinq the quartz suspensions
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University of Alberta The Role of High Molecular Weight Polyethylene ...
5.3.2 Flocculation of quartz and chalcopyrite single minerals ..... 56 5.3.3 Flocculation of quartz-chalcopyrite mixtures with varying amounts of ... Table 6.2 Binding energy of O 1s peaks of quartz suspension samples at pH 9 .. 85 Table 6.3 Binding energy of O 1s peaks of quartz suspension samples at pH 2. . 86
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A novel pH-responsive flocculant for efficient separation and recovery ...
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.
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Deflocculation of cellulosic suspensions with anionic high molecular ...
In addition, the method has been successfully used for fiber suspension flocculation studies earlier (Blanco et al. 2002; Ordóñez et al. 2009; Taipale et al. 2010). Therefore, the method is expected to be applicable to compare different deflocculants and dosage levels, and explain how different parameters affect the deflocculation of the pulp.
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Doctor of Chemistry, Ph D - ResearchGate
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 size distribution, solids ...
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Flocculation and Clarification of Mineral Suspensions - US EPA
At this point the sign of the zeta potential on quartz is reversed.26 These two points, namely: the hydrophobic surface and the reversal of the sign of the zeta potential, become of particular interest in inducing the flocculation condition for quartz suspensions.
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Flocculation and rheology of kaolinite/quartz suspensions
James and Williams, Flocculation and rheology of kaolinite/quartz suspensions 177 rather than a sphere, see e.g. [3, 5]. Herein these models together with additional calculations of inter- action energies for kaolinite-quartz interactions are used to examine the influence of flocculation on the
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Selective Flocculation
Selective flocculation utilizes the differences in the physical-chemical properties of the various mineral components in the mixed suspension. It is based on the preferential adsorption of an organic flocculant on the particular solids to be flocculated, leaving the remainder of the particles in suspension. In order to understand the mechanics ...
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A novel pH-responsive flocculant for efficient separation and recovery ...
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 into the suspension in the form of fine particles.
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The influence of particle size in flocculation phenomena of mixed ...
The U.S. Department of Energy's Office of Scientific and Technical Information
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Dispersant Adsorption and Viscoelasticity of Alumina Suspensions ...
The short-chain comb copolymer adsorbed in a 1.5 nm thick, rigid layer and gave low final strength to the consolidated suspension. It is likely that the poor consolidation behavior is caused by flocculation due to insufficient stabilization of the dispersion.
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Preparation of Flocculated and Deflocculated Suspensions, Stability ...
This means that a suspension that is smaller in particle size will be more stable. When particle-particle interaction occurs, it results in floccules or coagulates, increasing sedimentation. By wet milling the final suspension or by dry milling before the suspension, the particles are finely ground. 2. The viscosity of the medium
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European Journal of Engineering and Natural Sciences » Makale ...
Determination of the Effects of Operating Parameters on the Residual Turbidity of Quartz Suspensions by Design of Experiments Yıl 2016
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Selective Flocculation Separation of Fine Hematite from Quartz Using a ...
The suspension was made following the same procedure as flocculation process and then removed by centrifuging at 5000 r/min for 10 min. The supernatant was run through a UV spectroscope (UV−2000 Shimadzu, Kyoto, Japan) at 490 nm. ... Drzymala, J.; Fuerstenau, D.W. Selective flocculation of hematite in quartz–hematite–ferric ion ...
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Tasdemir and Tasdemir
content indicating that the sample is pure enough. The quartz sample which may causes pollution was chosen as a pollutant material since it is considered as one of the common components present in soils and clays [27]. SPP 508 (supplied from Superkim, Turkey) polymer was used for the flocculation of synthetically prepared fine quartz suspensions.
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Effects of Suspension Dispersity and Concentration on Flocculation ...
The objective of this research comprises the study how the suspension dispersity and concentration effect the efficiency of its flocculation in a static tubular flocculator and in a dynamic Couette flocculator. The studies used aqueous suspensions of ultra-fine calcium carbonate (<7 μ m) and fine silica (<90 μ m) as objects.
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Tasdemir and Tasdemir
Quartz suspension, Flocculation, Response surface method, Box-Behnken Design 1. INTRODUCTION Dewatering is a process identified as a part of solid/liquid separation and is an important process in most mineral processing operations. Generally, dewatering is accomplished by sedimentation or filtration ([1], [2]).
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Controlling the Stability of Medicinal Suspensions | American ...
Promoting Flocculation. The data displayed in Figure 2 suggests that more strongly acidic systems may be prone to flocculation. While flocculation is likely to lead to settling, and is therefore clearly linked to suspension instability, in this case it offers a potential route to formulation success (see second strategy outlined above) when the primary particles cannot be stabilized, as is the ...
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Ultrafine quartz flocculation: Part II. Main variables
The Fractional Factorial Design Method was used for the analysis of 32 flocculation and settling experiments with ultrafine quartz suspensions. Nine variables in two experimental levels, low (−) and high (+), were evaluated using the a statistical method for processing the numeric values.
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Marek Pawlik - UBC Professor - Faculty Member - Researcher - Supervisor
It was found that flocculation of model quartz suspension using a CT-exposed flocculant resulted in a lower settling rate of the flocs compared to flocculation using a fresh non-exposed polymer. This indicates the polymer breakage due to radiation exposure results in shorter polymer chain length and decreased flocculation performance. View record
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The Effects of pH on the Flocculation of Quartz Aqueous Suspensions ...
The effects of pH on the flocculation of quartz aqueous suspensions containing Ba2+, Fe3+ or Cu2+, respectively, were investigated by means of electrokinetic measurements. The violent flocculation takes place in the characteristic range of pH with respective cation involved. The calculation of the potential energy between approaching quartz particles indicates that the violent flocculation is ...
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Ultra flocculation of quartz suspensions: effects of shear rate ...
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 particle size distribution, solids content and shear rate has been investigated. It has been shown that the fine quartz suspensions (quartz particle diameter <5 μm) can be effectively flocculated in high non-uniform hydrodynamic ...
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(PDF) Determination of flocculation characteristics of natural stone ...
Determination of flocculation characteristics of natural stone powder suspensions in the presence of different polymers January 2014 Physicochemical Problems of Mineral Processing 50(1):169-184
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Selective Flocculation of Synthetic ... Modified Polymers
Flocculation of single mineral suspensions Flocculation refers to the process of aggregation involving interparticle bridging (La Mer, 1964; Kane and La Mer, 1964). Ability of polymers to ... Flocculation response of quartz as a function of conditioning time with Separan AP-30 is shown in Fig. 2. Good flocculation of quartz was observed
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Use Sodium Silicate as Dispersant in Selective Flocculation
Selective Flocculation Tests. A Ca++ addition of 10 ppm was chosen because flocculation tests, on quartz showed that considerably higher amounts of sodium silicate, involving higher ionic strength and the presence of colloidal silicate complexes, would be required to disperse quartz suspension containing more than 10 ppm Ca++.
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