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A separation device with dual drives and a method of reducing donutting in a separation device

A separation device and drive shaft technology, applied in the direction of separation methods, chemical instruments and methods, mixers with rotating stirring devices, etc., can solve the problem of increasing wear of drive components, hindering thickened slurry bed, thickener performance and efficiency Adverse effects and other issues

Inactive Publication Date: 2011-09-21
OUTOTEC OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, this phenomenon adversely affects thickener performance and efficiency in three main ways
First, the accumulation of agglomerated agglomerates around the rake assembly prevents the desired relatively uniform bed of thickened slurry from forming and reduces the effective cross-sectional area available for separation, thereby reducing the slurry density or underflow density
Second, the increased torque required to rotate the rake assembly increases wear on the drive assembly, thereby increasing the frequency of maintenance and thus increasing thickener downtime
Third, cake formation prevents the rake assembly from performing its primary function of raking settled solids to a central discharge point

Method used

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  • A separation device with dual drives and a method of reducing donutting in a separation device
  • A separation device with dual drives and a method of reducing donutting in a separation device
  • A separation device with dual drives and a method of reducing donutting in a separation device

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Embodiment Construction

[0152] A preferred field of application of the invention is mineral processing, separation and extraction whereby refined ore is suspended as a slurry in a suitable liquid medium such as water at a concentration that allows flow and settles at rest. The slurry settles out of suspension by gravity or a combination of gravity and chemical and / or mechanical treatment. As the slurry descends from the feedwell towards the bottom of the tank, the slurry gradually coagulates together to form agglomerates of larger slurry particles. This process is usually enhanced by the addition of flocculants (also known as "coagulants"), which hold together the settling solid particles or slurry particles. These larger and denser slurry aggregates settle more rapidly than individual particles due to their overall size and density relative to the surrounding liquid, thereby gradually forming a compacted structure within the slurry bed, as shown in Figure 1 best shown in. However, despite this com...

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Abstract

The present invention provides a separation device (20) for separating pulp from a feed material, the separation device comprising a tank (1 ) for receiving the feed material, a rake assembly (21 ) mounted for rotation within the tank (1) to move pulp towards an outlet (22) thereof and a shearing device (23) for shearing pulp within the tank (1), the shearing device (23) being mounted for movement independently of the rake assembly (21). The invention also provides a method for reducing donutting in a separation device (20).

Description

technical field [0001] The present invention relates to a separation device for suspensions and slurries, and in particular to a separation device comprising shearing means for shearing the slurry. This separation device was developed for use mainly in thickeners and will be described below with reference to this application. However, it will be appreciated that the invention is not limited to this particular field of application. Background technique [0002] The following discussion of the prior art is intended to present the invention in its proper technical context and to enable its significance to be properly understood. However, unless expressly indicated to the contrary, reference to any prior art in this specification should not be construed as an admission that such art is well known in the field or forms part of the common general knowledge. [0003] Separation devices such as thickeners, clarifiers and concentrators are commonly used to separate solids from susp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/02B01D21/20B01F7/30B01D21/06B01F7/18D21D5/00
CPCB01F7/003B01D21/06B01F7/30B01D21/283B01F7/00208B01F7/166B01F11/0082B01F7/00583B01D21/20B01D21/18B01D21/2427B01D21/286B01D21/28B01D21/34B01F27/091B01F27/11251B01F27/13B01F27/84B01F27/95B01F31/441
Inventor I·阿巴斯诺特R·特里格拉夫卡宁J·V·贝尔克
Owner OUTOTEC OYJ
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