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A purification method and application of pulping alkali recovery white liquor

A white liquor and pulping technology, which is applied to chemical instruments and methods, pulp bleaching, filtration treatment, etc., can solve the problem that the white liquor recovered by alkali cannot be used as alkali for bleaching, etc., so as to reduce the consumption of bleaching agent and improve the utilization rate of resources , cheap effect

Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing alkali recovery white liquor that cannot be used as alkali for bleaching and the prior art, and provide a white liquor purification method with high processing efficiency and automatic operation

Method used

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  • A purification method and application of pulping alkali recovery white liquor

Examples

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Embodiment 1

[0028] Example 1 Purification treatment and application of white liquor recovered from alkali recovery of waste liquor from chemical mechanical pulping

[0029] As a high-yield pulping method, chemical mechanical pulping can effectively utilize fiber raw materials, and the raw material consumption and water consumption per ton of pulp are less than those of chemical pulping. Pulping black liquor is similar and has the same calorific value. Therefore, for large-scale chemical mechanical pulp production enterprises, alkali recovery has been adopted for treatment. In this embodiment, the finished white liquor from the chemical mechanical pulp waste liquor alkali recovery workshop is processed as follows: first pump the white liquor from the pulping alkali recovery workshop into the storage tank, and then send it to the filter device at a flow rate of 5 m³ / h (The filter device is a stainless steel microporous membrane filter, and the material of the filter element is titanium) to ...

Embodiment 2

[0030] Example 2 Purification treatment and application of chemical mechanical pulping waste liquor and chemical pulping black liquor mixed with alkali to recover white liquor

[0031] For medium-sized chemical mechanical pulping enterprises, the pulping waste liquor can be pre-concentrated and mixed into the chemical pulping black liquor for alkali recovery together. In this embodiment, the mixed alkali recovery white liquor is processed as follows, the white liquor from the pulping alkali recovery workshop is first pumped into the storage tank, and then sent to the filter device at a flow rate of 5 m³ / h (the filter device It is a stainless steel microporous membrane filter, and the filter element material is titanium) to filter, and the filtered white liquor enters the refined white liquor tank. When the qualified refined alkali drops below 60% of the design capacity, start backwashing; first wash the tank with water The white liquor in the pipeline is pushed forward by the ...

Embodiment 3

[0032] Example 3 Purification treatment and application of chemical pulping black liquor alkali recovery white liquor

[0033] In this embodiment, the chemical pulping soda recovery white liquor is processed as follows, the white liquor from the pulping soda recovery workshop is first pumped into the storage tank, and then sent to the filter device at a flow rate of 5 m³ / h (the filter The device is a stainless steel microporous membrane filter, and the filter element material is titanium) to filter, and the filtered white liquor enters the refined white liquor tank. When the qualified refined alkali drops below 60% of the design capacity, start backwashing; wash with water first The clean water in the tank pushes out the white liquor in the pipeline in the forward direction, and then through the switching valve, the clean water enters the filter device in the reverse direction, and the flushing time is 2 minutes; then, the 6 wt% dilute hydrochloric acid in the pickling tank is ...

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Abstract

The invention discloses a method of purifying pulping alkali recovery white liquor and application; white liquor from a pulping alkali recovery workshop is fed to a filtering device for removing the impurities such as insoluble substances to obtain refined white liquor, backflushing the filtering device multiple times, and treating the washing wastewater. The scientific process with high treating efficiency and automated operation function is provided herein, the refined white liquor acquired by treating alkali recovery white liquor can be used for pulp bleaching instead of commercial alkali, the consumption of a bleaching agent is significantly reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to the field of pulping alkali recovery, in particular to a purification method and application of pulping alkali recovery white liquor. Background technique [0002] After years of rapid growth, my country's paper industry ranks first in the world in terms of annual output and consumption. However, compared with paper-making developed countries, my country's paper industry wastewater is still a serious problem of environmental pollution, and the cost of water treatment remains high; on the other hand , due to fierce market competition, improving resource utilization and reducing production costs is the key to the sustainable development of enterprises. [0003] Chemical pulping and chemical mechanical pulping are the main two primary pulp production methods. In the chemical pulping black liquor and chemical mechanical pulping waste liquor, inorganic substances such as carbohydrates, lignin, extracts and alkalis are produced. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F1/44D21C9/10C02F103/28
CPCC02F1/001C02F1/444C02F2103/28C02F2303/14D21C9/10
Inventor 徐峻吴振华李军莫立焕陈克复
Owner SOUTH CHINA UNIV OF TECH