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Treatment method of papermaking black liquid

A technology for papermaking black liquor and a treatment method, applied in the papermaking field, can solve the problems of incapable of resource utilization and ineffective reduction of waste water treatment load, and achieve the effects of reducing waste water treatment load, increasing economic benefits, and reducing CODCr value

Active Publication Date: 2015-05-20
GOLD EAST PAPER JIANGSU
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Problems solved by technology

[0004] However, the existing black liquor treatment technology can neither effectively reduce the wastewater treatment load, nor can it be utilized as a resource, turning waste into wealth and increasing the economic benefits of enterprises

Method used

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  • Treatment method of papermaking black liquid

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no. 1 approach

[0019] refer to figure 1 , figure 1 It is the first embodiment of the processing method of papermaking black liquor of the present invention, comprises the steps:

[0020] Step S110: concentrating and separating the papermaking black liquor to obtain a first solid and a first clarified liquid.

[0021] At present, the plant fiber raw materials used in papermaking mainly contain three parts: cellulose, lignin and hemicellulose (polysaccharides). The lignin accounting for 25%, the hemicellulose accounting for about 28%, and other organic extracts and inorganic substances are discarded along with the papermaking black liquor.

[0022] In this embodiment, firstly, the papermaking black liquor is concentrated to separate out the solid phase in the papermaking black liquor. In order to precipitate the solid phase of the papermaking black liquor, it can be concentrated by evaporation. Further, in order to fully separate out the solid phase of the papermaking black liquor, multipl...

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Abstract

The invention discloses a treatment method of papermaking black liquid. The treatment method comprises the following steps: concentrating the papermaking black liquid, and separating to obtain a first solid matter and a first supernatant; neutralizing the first supernatant with an acid, and separating to obtain a second solid matter and a second supernatant; concentrating the second supernatant, and separating to obtain a third solid matter and a third supernatant. By adopting the treatment method disclosed by the invention, the CODCr of the waste liquid can be reduced, the wastewater treatment load can be reduced, different solid matters can be recycled respectively, and the economic benefit of enterprises can be increased.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a processing method for papermaking black liquor. Background technique [0002] With the development of society and economy, the state has stricter and stricter requirements on the pollution control and discharge of papermaking enterprises. The new standard of the Ministry of Environmental Protection stipulates that the discharge of water pollutants in the paper industry, of which COD Cr The concentration limit shall not be higher than 80mg / L. [0003] COD of black liquor produced in chemical mechanical pulping process Cr Up to 10000~15000mg / L, of which lignin and degradation products account for about the total COD Cr 50% of. At present, the main method of black liquor treatment is to separate organic matter, and then incinerate to recover chemicals. [0004] However, the existing black liquor treatment technology can neither effectively reduce the wastewater treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04D21C11/10
CPCD21C11/00D21C11/0071D21C11/10
Inventor 闵斗勇董郑伟黄铖於旺盛
Owner GOLD EAST PAPER JIANGSU
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