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A papermaking recycling pulp processing technology

A technology for processing and recovering pulp, which is applied in papermaking, papermaking machines, textiles and papermaking, etc. It can solve the problems of pulping and quantitative fluctuations, reduce production stability, production loss, etc., and achieve reduced loss and stable broken paper line concentration Effect

Active Publication Date: 2018-01-12
上海东冠纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the design of some economical paper machines, the broken paper line process is often very simple, and the thickener and deflaker are often canceled. In this way, the concentration control of the broken paper line becomes very important. If the concentration is lower than the pulp concentration , will affect the normal concentration fluctuations of the pulp line, resulting in fluctuations in refining and ration, reducing production stability, and sometimes causing production losses

Method used

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  • A papermaking recycling pulp processing technology
  • A papermaking recycling pulp processing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 2 Shown, a kind of papermaking recovery slurry processing technology comprises the following steps in sequence:

[0029] (1) Air flotation process papermaking white water to obtain recycled slurry; the steps and process conditions of the air flotation method are: open the white water pump to make the white water enter the air flotation device; after the white water is about to be injected to the overflow level , turn on the driving and skimming device of the air flotation device; the air flotation device starts to operate, and adjust the inlet pressure and outlet water pressure of the steam dissolving tank so that the slurry in the white water can float normally;

[0030] The air flotation device is connected with an air compressor, the air compressor pressure is 0.8MPa, and the air flow rate is 1.0m 3 / h, the outlet pressure of the steam tank is 0.5MPa, the driving motor frequency of the air flotation device is 25Hz, and the motor frequency of the skim...

Embodiment 2

[0039] A process for treating pulp recovered from papermaking, comprising the following steps in sequence:

[0040] (1) Air flotation process papermaking white water to obtain recycled slurry; the steps and process conditions of the air flotation method are: open the white water pump to make the white water enter the air flotation device; after the white water is about to be injected to the overflow level , turn on the driving and skimming device of the air flotation device; the air flotation device starts to operate, and adjust the inlet pressure and outlet water pressure of the steam dissolving tank so that the slurry in the white water can float normally;

[0041] The air flotation device is connected with an air compressor, the pressure of the air compressor is 0.6MPa, and the air flow rate is 0.8m 3 / h, the outlet pressure of the steam tank is 0.4MPa, the driving motor frequency of the air flotation device is 20Hz, and the motor frequency of the skimming device is 5Hz.

...

Embodiment 3

[0050] A process for treating pulp recovered from papermaking, comprising the following steps in sequence:

[0051](1) Air flotation process papermaking white water to obtain recycled slurry; the steps and process conditions of the air flotation method are: open the white water pump to make the white water enter the air flotation device; after the white water is about to be injected to the overflow level , turn on the driving and skimming device of the air flotation device; the air flotation device starts to operate, and adjust the inlet pressure and outlet water pressure of the steam dissolving tank so that the slurry in the white water can float normally;

[0052] The air flotation device is connected with an air compressor, the pressure of the air compressor is 1MPa, and the air flow rate is 1.5m 3 / h, the outlet pressure of the steam tank is 0.6MPa, the driving motor frequency of the air flotation device is 30Hz, and the motor frequency of the skimmer is 15Hz.

[0053] Th...

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Abstract

The invention relates to a process for treating recycled pulp in papermaking, which is characterized in that the process comprises the following steps in sequence: (1) treating papermaking white water by air flotation to obtain recycled pulp; (2) treating the recycled pulp obtained in step (1) Transport to the hardwood pulper for pulping treatment, and stabilize the concentration in the pulper; (3) The slurry obtained in step (2) is mixed into the pulp line for subsequent papermaking production. Compared with the prior art, the invention has the advantages of high concentration of recovered pulp, stable pulp line concentration and the like.

Description

technical field [0001] The invention relates to a process for treating recycled pulp in papermaking, in particular to a process for treating recovered pulp treated by an air flotation method. Background technique [0002] Cleaner production is an inevitable trend for the sustainable development of the paper industry, and the recycling of production water in the paper industry is an important way of cleaner production. The latest "Water Pollutant Discharge Standard for Paper Industry" issued by the State Environmental Protection Administration has played a positive role in promoting the development of this process. The national standard GB3544-2008 has improved the discharge requirements of environmental water, and the new discharge standard further tightens the discharge of papermaking water. At present, the reduction of water used for papermaking and the reuse of white water have been carried out to varying degrees in our country, but there is still a big gap between the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F1/66
Inventor 洪增源杜林王红星翟荣甫
Owner 上海东冠纸业有限公司
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