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A process for recycling wood pulp and papermaking black liquor

A technology for papermaking black liquor and recycling, which is applied in the regeneration of alkali liquor, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. , complex process and other problems, to achieve the effect of energy saving, emission reduction and recycling, wide application range and simple process

Inactive Publication Date: 2016-02-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although our country has been actively exploring the comprehensive treatment, development and utilization of papermaking black liquor for many years, and has achieved some practical results, the treatment methods of papermaking black liquor mainly used in my country are still relatively traditional and backward, such as alkali recovery method , acid analysis method, flocculation precipitation method, chemical oxidation method, biological treatment method, etc., these methods have certain limitations, often have shortcomings such as high investment, complicated process, high energy consumption, and low comprehensive utilization efficiency, and cannot be compared effectively Thoroughly solve the problem of papermaking black liquor

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  • A process for recycling wood pulp and papermaking black liquor

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Embodiment 1

[0025] A method for recycling wood pulp and papermaking black liquor, the specific steps are as follows:

[0026] (1) will be 60m 3 The wood pulp and papermaking black liquor with a processing capacity of / h is heat-exchanged through a plate heat exchanger, and its temperature is controlled at 20-50°C. The pH of the wood pulp and papermaking black liquor is 12.5-13.5, and the solid content is 10-12%. Suspended matter content is less than 30mg / L.

[0027] (2) The 60m after heat exchange 3 / h Wood pulp and papermaking black liquor is coarsely filtered with a sand filter. The sand filter adopts an anti-corrosion shell lined with carbon steel and hard rubber, and is filled with ASM special sand and gravel filter material. The patented product of Israel ARKAL company, its particle size is 0.6-0.7mm. The total filtration area of ​​the sand filter is 4.52m 2 , the height of the filter layer of the special sand and gravel filter material is 50cm, and the filter operation paramete...

Embodiment 2

[0031] The method and device for recycling wood pulp and papermaking black liquor in this embodiment are substantially the same as those in Embodiment 1. The differences are: 1) The solid matter concentration of the treated wood pulp and papermaking black liquor is about 15%, and the suspended matter content is about 40mg / L; 2) The operating parameters of the coarse filtration process are: the inlet pressure is about 0.4MPa, the backwash pressure About 0.4MPa, filtration rate of about 15m / h, backwash interval time of about 4h, backwash flow rate of about 45m / h, flushing time of about 2min; 3) The selected self-cleaning filter is made of polypropylene laminated sheets, and the filtration accuracy is 100μm , the operating parameters of the fine filtration process are: operating pressure 0.5MPa, external source backwashing, backwashing pressure 0.7MPa, backwashing flow 50m 3 / h, the backwashing interval is about 2.5h, each filter unit is backwashed one by one in sequence, the bac...

Embodiment 3

[0033] The method and device for recycling wood pulp and papermaking black liquor in this embodiment are substantially the same as those in Embodiment 1. The differences are: 1) The solid matter concentration of the processed wood pulp and papermaking black liquor is about 18%, and the suspended matter content is 50mg / L; About 0.5MPa, filtration rate about 20m / h, backwash interval time about 2h, backwash flow rate about 50m / h, flushing time about 3min; 3) The selected self-cleaning filter is made of polypropylene laminated sheets, and the filtration accuracy is 200μm , the operating parameters of the fine filtration process are: the operating pressure is about 1.0MPa, the external source backwashing is adopted, the backwashing pressure is 1.0MPa, and the backwashing flow rate is 50m 3 / h, the backwashing interval is about 1.5h, each filter unit is backwashed one by one in sequence, the backwashing time of each unit is about 30 seconds, and the backwashing interval of each unit...

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Abstract

The invention belongs to the field of waste water treatment in environmental protection technology, and provides a process of wood pulp papermaking black liquor resourceful treatment. The process mainly comprises the following steps: (1) the wood pulp papermaking black liquor is treated by a plate type heat exchanger for heat transfer, and the temperature is controlled at 20-50 DEG C.; (2) the wood pulp papermaking black liquor is treated by a sand filter for coarse filtration; (3) the wood pulp papermaking black liquor is treated by a self-cleaning filter for precision filtering; (4) the wood pulp papermaking black liquor after fine filtration is treated by a nanofiltration membrane for filtering treatment; (5) the obtained nanofiltration membrane colature can be returned to a boiling workshop section for recycling of alkali, and after the obtained nanofiltration membrane concentrate is evaporated and concentrated, the concentrate can be used for exploitation of lignin series industrial products. The starting point of the invention is the treatment present situation and real demand of the wood pulp papermaking black liquor in our country, thereby realizing energy saving and emission reduction and recycling of pollutants in the wood pulp papermaking black liquor, and the invention has the advantages of wide range of application, advanced process, simple flow, reliable technology, reality application and popularization value.

Description

field of invention [0001] The invention belongs to the field of waste water treatment in the environmental protection technology, and in particular relates to a process for resourceful treatment of wood pulp and papermaking black liquor. technical background [0002] In my country, the total amount of papermaking wastewater is second only to metallurgical wastewater and petrochemical wastewater, and the environmental pollution of papermaking wastewater is very serious. Among them, the pollutants in papermaking black liquor account for about 90% of the total pollutants in papermaking wastewater. Black liquor contains refractory lignin and its degradation derivatives. Lignin is a three-dimensional network polymer with aromatic structure. , has comprehensive utilization value. And papermaking black liquor is also a highly alkaline complex pollution system, which can easily cause water pollution and serious damage to the ecological environment. Therefore, how to reasonably and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/04C02F9/02
Inventor 谢雄鲍建国
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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