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Method for treating liquid flows at a chemical pulp mill

A pulping plant and liquid flow technology, applied in the regeneration of pulping chemical liquid, washing/replacing pulp treatment liquid, pulping with inorganic alkali, etc., can solve the problems of efficiency decline and other problems

Active Publication Date: 2012-10-03
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A decrease in the efficiency of the bleaching stage is observed as a reduced brightness change or higher kappa number after the bleaching stage or stages

Method used

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  • Method for treating liquid flows at a chemical pulp mill
  • Method for treating liquid flows at a chemical pulp mill
  • Method for treating liquid flows at a chemical pulp mill

Examples

Experimental program
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Effect test

Embodiment Construction

[0103] exist figure 1 The system listed in describes the bleach sequence O-A / D-EOP-D, only the sequence of scrubbers 2-5 is listed. The wash water is passed in reverse with respect to the pulp, and the filtrate originating from each washing unit is treated in a separate purification. Via process line 6 fresh water, or water from a pulp dryer or respectively, is introduced into the washer 5 of the D stage. The wash filtrate is discharged from wash 5 via work line 7 to effluent purification 8 . Scrubber 4 at the EOP stage uses purified water, which flows here via process line 9 . The filtrate produced in scrubber 4 is discharged via line 10 to effluent purification 11 and after this treatment is also discharged via line 12 to scrubber 3 of the A / D stage. The A / D stage scrubber filtrate 13 is treated in purification 14 whereby it is discharged via line 15 to an oxygen stage scrubber for filtrate production, which is also discharged via line 16 to brown stock treatment. Via wo...

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Abstract

The present invention relates to a method for treating liquid flows at a chemical pulp mill comprising at least an alkaline cooking process for producing pulp, treatment of brown stock generated in the cooking, a bleaching plant using ECF-bleaching, in which chloride-containing effluents are formed, an effluent purification plant for treating bleaching plant effluents and other effluents generated at the mill. At least a portion of the effluents is returned after the purification to the pulp production line as source of process water. Essentially, more than one treatment line is arranged at the effluent purification plant for the mill effluents and that effluents with different chemical compositions are purified in separate treatment lines so that the quality and amount of purified water from each treatment line is suitable for use in a stage or stages of the production process, whereto purified effluent is returned.

Description

technical field [0001] The present invention relates to a process for the treatment and utilization of liquid streams in a chemical pulp mill comprising at least an alkaline cooking process for the production of pulp, treatment of the brown stock produced in the cooking, a bleaching plant using ECF bleaching in which chlorinated Effluents, effluent purification plants for the treatment of bleach plant effluents and other effluents generated at pulp mills. Background technique [0002] During the past few years, the size of pulp mills has increased substantially, as today a pulp mill producing 1 million tons / a is the standard size, and it seems that the increase in pulp mill size will not stop. While pulp mills are growing in size, pulp mills are being built in areas and surroundings with very strict environmental protection regulations. For example, a pulp mill may have to strictly limit the amount of water used. A small reduction in the amount of water used by the pulp mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/14
CPCD21C9/02D21C9/14D21C3/02D21C9/10D21C11/00
Inventor 雅纳·韦赫马奥拉维·皮卡佩卡·特沃拉
Owner ANDRITZ AG
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