What is Banana screens and how it works?
Banana or Multi-slope screens have become widely used in high-tonnage sizing applications where both efficiency and capacity are important. Banana screens typically have a variable slope of around 40-30 degree at the feed end of the screen, reducing to around 0-15 degree in increments of 3.5-5 degree. Banana screens are usually designed with a linear-stroke vibrator. The steep sections of the screen cause the feed material to flow rapidly at the feed end of the screen. The resulting thin bed of particles stratifies more quickly and therefore has a faster screening rate for the very fine material than would be possible on a slower moving thick bed. Towards the discharge end of the screen, the slope decreases to slow down the remaining material, enabling more efficient screening of the near-size material. The capacity of banana screens is significantly greater and is reported to be up to three or four times that of conventional vibrating screens.
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Banana or Multi-slope screens have become widely used in high-tonnage sizing applications where both efficiency and capacity are important. Banana screens typically have a variable slope of around 40-30 degree at the feed end of the screen, reducing to around 0-15 degree in increments of 3.5-5 degree. Banana screens are usually designed with a linear-stroke vibrator. The steep sections of the screen cause the feed material to flow rapidly at the feed end of the screen. The resulting thin bed of particles stratifies more quickly and therefore has a faster screening rate for the very fine material than would be possible on a slower moving thick bed. Towards the discharge end of the screen, the slope decreases to slow down the remaining material, enabling more efficient screening of the near-size material. The capacity of banana screens is significantly greater and is reported to be up to three or four times that of conventional vibrating screens.
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Vane Feedwell
Introduction
Thickening of solids to separate and recover water has been a critical step in mineral processing plants since the late 19
century. Initially due to effective dewatering of the solids being required to recover the valuable minerals, but now in the 21 century recovery and re-use of the water is equally important.
Development of flocculants in the early 1960’s started a
revolution in thickener design and operation eventually leading to the start of high rate thickening in the late 1960’s. These thickeners are characterised by a feedwell with a bottom plate to deflect the flocculated feed horizontally into a preformed flocculated bed.
Modern high rate thickeners generally incorporate some form of internal dilution into the feedwell to dilute the feed and improve flocculation. Other than some minor design changes feedwells in high rate thickeners have changed little for nearly 40 years.
The Feedwell’s Job
A thickener feedwell has six basic functions to fulfil:
1. Dissipate the energy of the incoming feed
2. Introduce dilution water to achieve the optimal density
in the feedwell for flocculation of the solids
3. Mix the flocculant into the incoming feed
4. Retain feed in the feedwell whilst dilution and
flocculation occur
5. Distribute the flocculated material evenly over the
thickener diameter
6. Deaeration of the incoming feed
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Introduction
Thickening of solids to separate and recover water has been a critical step in mineral processing plants since the late 19
century. Initially due to effective dewatering of the solids being required to recover the valuable minerals, but now in the 21 century recovery and re-use of the water is equally important.
Development of flocculants in the early 1960’s started a
revolution in thickener design and operation eventually leading to the start of high rate thickening in the late 1960’s. These thickeners are characterised by a feedwell with a bottom plate to deflect the flocculated feed horizontally into a preformed flocculated bed.
Modern high rate thickeners generally incorporate some form of internal dilution into the feedwell to dilute the feed and improve flocculation. Other than some minor design changes feedwells in high rate thickeners have changed little for nearly 40 years.
The Feedwell’s Job
A thickener feedwell has six basic functions to fulfil:
1. Dissipate the energy of the incoming feed
2. Introduce dilution water to achieve the optimal density
in the feedwell for flocculation of the solids
3. Mix the flocculant into the incoming feed
4. Retain feed in the feedwell whilst dilution and
flocculation occur
5. Distribute the flocculated material evenly over the
thickener diameter
6. Deaeration of the incoming feed
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The Vane Feedwell
A feedwell with an inner floor of vanes separating it into two chambers is the answer. The upper chamber is mixed using tangential feed entry and directional feed dilution whilst the lower chamber is maintained as a low shear zone that allows aggregates to grow prior to being evenly distributed into the main thickener body.
Extensive development and modelling of this idea, and others, by Outotec has led to the design seen in figure 👇. During the development phase Outotec, through their sponsorship of the AMIRA P266E “Improving Thickener Technology” project, engaged CSIRO’s Computational Fluid Dynamic modellers to verify and improve on the Next Generation design.
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A feedwell with an inner floor of vanes separating it into two chambers is the answer. The upper chamber is mixed using tangential feed entry and directional feed dilution whilst the lower chamber is maintained as a low shear zone that allows aggregates to grow prior to being evenly distributed into the main thickener body.
Extensive development and modelling of this idea, and others, by Outotec has led to the design seen in figure 👇. During the development phase Outotec, through their sponsorship of the AMIRA P266E “Improving Thickener Technology” project, engaged CSIRO’s Computational Fluid Dynamic modellers to verify and improve on the Next Generation design.
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OTE_Vane_Feedwell_eng_web.pdf
232.4 KB
OTE_Vane_Feedwell
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امام علی (ع) :
لاف بلاغت مزن با کسی که راه نیکو سخن گفتن را به تو آموخت. عید غدیر مبارک
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لاف بلاغت مزن با کسی که راه نیکو سخن گفتن را به تو آموخت. عید غدیر مبارک
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