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Process and device for aerating suspensions

一种悬浮液、液体的技术，应用在浮选、纺织品和造纸、回收利用技术等方向，能够解决降低印墨和污点去除的效率、增大纤维损失、污点难去除等问题，达到省去二次浮选、减少纤维的损失、改进污点的去除的效果

Inactive Publication Date: 2004-09-01
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if we try to remove fillers by making certain changes in the process, the efficiency of ink and stain removal will always be reduced, which will require additional changes in aeration, adjustments for raw material fluctuations, and changes in production volume.
In addition, if the spill volume is increased to increase stain and mineral removal, the fiber loss will be increased proportionally, which will increase the cost of processing materials and raw materials.
Stains are difficult to remove during flotation due to their particle size and resistance to flow in the tank

Method used

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  • Process and device for aerating suspensions
  • Process and device for aerating suspensions
  • Process and device for aerating suspensions

Examples

Experimental program
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Effect test

Embodiment Construction

[0030] figure 1 It is a schematic diagram of a flotation device with four primary batteries P1, P2, P3, P4 and two secondary batteries S1, S2 in the prior art. The flow of slurry suspension Z enters the first galvanic cell P1 at a suitable point. Air bubbles are generated in the cell via circuit 1 , which is disconnected from the feed section, and air L is sucked in via injector 2 and mixed into the suspension. The entire flotation device is largely filled with a suspension whose surface 0 is formed with froth, containing as much material and ink particles as possible to be removed by flotation. The receiving stream filtered to remove ink and impurities in the primary cell P1 is conveyed through an opening 5 in the bottom of the partition wall 10 to the second primary cell P2. In all other galvanic cells at this time, the suspension was treated in the same way by means of bubble-generating injectors operated by the internal cell circuit and discharged as receiver G to the pl...

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PUM

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Abstract

In a waste paper recovery floatation process a fibrous suspension is aerated in a multi-stage process (P1-P4, S1-S2), each with a discrete liquid circulation system (6). Each stage selectively removes a particular impurity in or between a primary or secondary cell. Also claimed is a commensurate assembly in which the concentration of suspended fibres is reduced to 0.8-1.3% prior to admission to secondary cells. The process further incorporates one or more intermediate cleaners (12) that are located in accordance with the particular process requirements and the degree of cleansing required in the primary cells. Alternatively or in addition, a cleaner (12') may be installed in a secondary cell circuit immediately after an injector pump (13) operating at higher pressure than prior art.

Description

technical field [0001] The present invention relates to a method of aerating a suspension using one or more stages and / or cells, and in particular to a method of flotation such as in the deinking of slurry suspensions, wherein each stage / cell has its own Separate liquid circuit. Furthermore, the invention relates to a device for carrying out the method. Background technique [0002] Reuse of printed paper containing high concentrations of minerals (pigments such as calcium carbonate and kaolin) requires process adjustments during recycling and in secondary pulping during the deinking process. [0003] The input of non-fibrous substances involved (inks, minerals, etc.) is problematic with respect to the recycling process. Operators of waste paper processing plants are forced to remove excess ink and minerals. Deinking flotation is the process of removing impurities and ink particles from fiber stock suspensions, especially those produced in wastewater treatment. Since it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02B03D1/14D21B1/32D21D5/24D21F1/70
CPCB03D1/1418D21D5/24D21B1/327B03D1/14B03D1/1406B03D1/1462B03D1/02D21F1/70Y02W30/64
Inventor H·加布尔
Owner ANDRITZ AG
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