The impact of achieving a higher aggregate density on polymer-bridging flocculation

2013 ◽  
Vol 124 ◽  
pp. 83-94 ◽  
Author(s):  
A.F. Grabsch ◽  
P.D. Fawell ◽  
S.J. Adkins ◽  
A. Beveridge
Keyword(s):  
Bridging Flocculation ◽  
Polymer Bridging ◽  
The Impact

scholarly journals A Population Balance Model for Shear-Induced Polymer-Bridging Flocculation of Total Tailings

Minerals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 40
Author(s):  
Zhuen Ruan ◽  
Aixiang Wu ◽  
Raimund Bürger ◽  
Fernando Betancourt ◽  
Rafael Ordoñez ◽  
...  
Keyword(s):  
Population Balance ◽  
Particle Collision ◽  
Balance Model ◽  
Population Balance Model ◽  
Frequency Model ◽  
Floc Size ◽  
Bridging Flocculation ◽  
Polymer Bridging ◽  
The Difference ◽  
Fitting Parameters

Shear-induced polymer-bridging flocculation is widely used in the solid–liquid separation process in cemented paste backfill, beneficial to water recycling and tailings management in metal mines. A flocculation kinetics model based on Population Balance Model (PBM) is proposed to model the polymer-bridging flocculation process of total tailings. The PBM leads to a system of ordinary differential equations describing the evolution of the size distribution, and incorporates an aggregation kernel and a breakage kernel. In the aggregation kernel, a collision frequency model describes the particle collision under the combined effects of Brownian motions, shear flow, and differential sedimentation. A semi-empirical collision efficiency model with three fitting parameters is applied. In the breakage kernel, a new breakage rate coefficient model with another three fitting parameters is introduced. Values of the six fitting parameters are determined by minimizing the difference between experimental data obtained from FBRM and modeling result through particle swarm global optimization. All of the six fitting parameters vary with flocculation conditions. The six fitting parameters are regressed with the flocculation factors with six regression models obtained. The validation modeling demonstrates that the proposed PBM quantifies well the dynamic evolution of the floc size during flocculation under the given experimental setup. The investigation will provide significant new insights into the flocculation kinetics of total tailings and lay a foundation for studying the performance of the feedwell of a gravity thickener.

Using turbulent pipe flow to study the factors affecting polymer-bridging flocculation of mineral systems

2008 ◽  
Vol 87 (3-4) ◽  
pp. 90-99 ◽  
Author(s):  
A.T. Owen ◽  
P.D. Fawell ◽  
J.D. Swift ◽  
D.M. Labbett ◽  
F.A. Benn ◽  
...  
Keyword(s):  
Pipe Flow ◽  
Turbulent Pipe Flow ◽  
Factors Affecting ◽  
Bridging Flocculation ◽  
Polymer Bridging

Mechanism and Strength of Polymer Bridging Flocculation

1998 ◽  
Vol 81 (26) ◽  
pp. 5840-5843 ◽  
Author(s):  
J. Swenson ◽  
M. V. Smalley ◽  
H. L. M. Hatharasinghe
Keyword(s):  
Bridging Flocculation ◽  
Polymer Bridging

Sedimentation and consolidation of different density aggregates formed by polymer-bridging flocculation

2018 ◽  
Vol 184 ◽  
pp. 111-125 ◽  
Author(s):  
F.A. Benn ◽  
P.D. Fawell ◽  
J. Halewood ◽  
P.J. Austin ◽  
A.D. Costine ◽  
...  
Keyword(s):  
Bridging Flocculation ◽  
Polymer Bridging

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics

1997 ◽  
Vol 161 ◽  
pp. 197-201 ◽  
Author(s):  
Duncan Steel
Keyword(s):  
Probability Distributions ◽  
Regions Of Interest ◽  
Significant Fraction ◽  
Organic Chemicals ◽  
Impact Speed ◽  
The Mean ◽  
The Impact

AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbital distribution of known asteroids; and (ii) the expected distribution of near-parabolic cometary orbits. It is found that cometary impacts are far more likely to eject rocks from Mars (over 99 percent of the cometary impacts are at speeds above 20 km/sec, but at most 5 percent of the asteroidal impacts); paradoxically, the objects impacting at speeds low enough to make organic/volatile survival possible (the asteroids) are those which are depleted in such species.

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