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Perfected flotation cell for purifying fibrous suspensions

A flotation machine and suspension technology, applied in fiber raw material processing, flotation, fiber raw materials, etc., can solve the problems of pump suction device consumption, high power, complicated maintenance time and other problems, and achieve low implementation cost, overall simplicity, The effect of great flexibility

Inactive Publication Date: 2010-03-24
COMER SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The disadvantage of the described pumping devices connected to the venturi tubes is that the pumping devices consume a lot of power because they have to overcome the flow resistance caused by the venturi tubes, with the result that the flotation machines are expensive to operate
[0017] Another disadvantage posed by the above-mentioned flotation machines is the maintenance complexity and the maintenance time required due to the presence of the venturi tube and the corresponding pumping device

Method used

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  • Perfected flotation cell for purifying fibrous suspensions
  • Perfected flotation cell for purifying fibrous suspensions
  • Perfected flotation cell for purifying fibrous suspensions

Examples

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Embodiment Construction

[0040] figure 1 The flotation machine that is the subject of the invention is illustrated in , where the reference number 1 indicates the flotation machine as a whole, in figure 1 As can be seen in , the flotation machine comprises a container 2 for the suspension 3 to be purified, said container 2 being preferably but not necessarily cylindrical.

[0041] The suspension 3 is introduced into the container 2 through supply pipes 4 , the number and outlet positions of which can vary in different embodiments of the invention according to the flow generated in the container 2 .

[0042] For simplicity, figure 1 Only three supply pipes 4 on the left are shown, however, as image 3 As shown in the plan view of , the supply pipe 4 is arranged on the entire periphery of the container 2 .

[0043] The flotation machine 1 of the invention also comprises means 5 for intercepting the purified suspension flowing downwards towards the bottom of the vessel 2 due to gravity, said means 5 b...

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Abstract

The invention concerns a flotation cell (1; 30) for purifying fibrous suspensions through the dispersion of air microbubbles (22), comprising: a container (2; 31); feed pipes (4; 34) for conveying thesuspension (3) into the container (2; 31); means (5; 35) for intercepting the purified suspension; means (6) for extracting the purified suspension; means (7) for discharging the foams created by theimpurities contained in the suspension (3); rotary vanes (19; 36) arranged inside the container (2; 31). The cell (1; 30) comprises air dispersers (10; 32; 42) for generating air microbubbles (22) and dispersing them in the suspension (3), in each one of which it is possible to identify one rotor (11; 45) with axial flow associated with driving means (12; 47) and one duct (13; 40; 46) for conveying external air at the level of the rotor (11; 45).

Description

technical field [0001] The invention relates to a flotation machine for cleaning fiber suspensions, especially suitable for use in recycled paper processing. Background technique [0002] As is known, recycled paper is manufactured from an aqueous mixture of fiber suspensions which also contain impurities, mainly inks, which must be removed from the mixture. [0003] Purification of the suspension is carried out according to known techniques in a suitable flotation machine essentially consisting of a vessel in which the fibrous suspension is mixed with a large number of air microbubbles which move spontaneously upwards towards the surface of the suspension, these air microbubbles Bubbles bring impurities to the surface. [0004] Impurities accumulate on the surface of the mixture in the form of foam which can be removed from the vessel while the purified fiber suspension travels towards the bottom of the vessel and is drawn from one or more points to continue the process cy...

Claims

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Application Information

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IPC IPC(8): D21B1/32D21F1/70
CPCD21B1/327B03D1/1412B03D1/24D21F1/70B03D1/1462B03D1/18Y02W30/64
Inventor 佛朗哥·阿韦尔
Owner COMER SPA
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