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Treatment method and device for alkaline straw pulp paper making black liquor

A technology of papermaking black liquor and treatment method, which is applied in papermaking, textiles and papermaking, fiber raw material treatment, etc. It can solve the problems of yellow slag increasing process complexity, adding more aluminum sulfate, increasing processing cost, etc., and achieves good separation Practical, small investment, simple equipment and process

Inactive Publication Date: 2007-09-12
济南大陆机电股份有限公司
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  • Application Information

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Problems solved by technology

[0003] In the application number 00113922 titled "in the comprehensive treatment method of alkaline papermaking sewage", a kind of local materials are disclosed, and the aluminum sulfate solution in the production process is selected to carry out the black liquor neutralization acidification and the

Method used

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  • Treatment method and device for alkaline straw pulp paper making black liquor
  • Treatment method and device for alkaline straw pulp paper making black liquor
  • Treatment method and device for alkaline straw pulp paper making black liquor

Examples

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Example Embodiment

[0035] 1. A kind of soda straw pulp papermaking black liquor processing method adopts two steps successively:

[0036] 1) Black liquor treatment:

[0037] a. will be 130m 3 COD 120,000 mg / L black liquor is pumped into static mixer 8, 9m from black liquor tank 3 through black liquor pump 6 3 The flocculant is poured into the static mixer 8 from the flocculant tank 1 through the flocculant pump 4, and its flow rate is 0.8 meters per second, and the first half of the length of 4 meters in the passing static mixer is mixed, and the mixing time is 5 seconds. The flocculant is high-molecular polyacrylamide with a molecular weight of 14 million, and the amount added is 10 / 10,000 of the total weight of the black liquor.

[0038] b. The static mixer 8 can allow the two to fully mix, and then mix with the waste sulfuric acid with a concentration of 24% from the dilute acid tank 2 through the dilute acid pump 5 and pass through the second half of the static mixer 8. The length of the s...

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Abstract

The invention relates to a device and method of black liquor processing in soda straw paper-making. It contains the following two steps: 1. Black liquor processing: black liquor, flocculant and diluted acid are mixed in a static mixer and overflowed by a flocculation precipitation pot into a stew net filter to filtrate. Add inorganic acid acidulant to lower pH of the mixture to 3.5-1.5. The lignin in black liquor forms brown floccule which is easy to filtrate. Filtrate and floccule can be separated quickly in stew net filter. 2. Filtrate processing: after deposited and hydrolyzed for 1-3 days, the filtrate is neutralized with waste white clay or lime produced by Silvola recovery to get a pH between 6.5 and 7.2. After being deposited by a desilter, it experiences biochemical process in an anaerobic pool. Then, processed by aerobic treatment in intermediate water treatment system and recovered or released if acceptable. The invention has simple technology and small investment. After hydrolyzing, neutralizing, anaerobic and biochemical treatments, the filtrate is mixed into intermediate water without influence on treating effect and qualified release of the subsequent intermediate water treatment.

Description

(1) Technical field [0001] The invention relates to the technical field of alkaline papermaking sewage treatment, in particular to a treatment method and equipment for alkaline straw pulp papermaking black liquor. (2) Background technology [0002] The environmental pollution of straw pulp papermaking wastewater has always troubled papermaking enterprises, and has now affected the survival of enterprises, especially the alkaline cooking liquor in the papermaking process is difficult to deal with, and its COD is as high as 80,000-120,000 mg / L, which is the main source of pollution. [0003] In the application number 00113922 titled "in the comprehensive treatment method of alkaline papermaking sewage", a kind of local materials are disclosed, and the aluminum sulfate solution in the production process is selected to carry out the black liquor neutralization acidification and the method of flocculation filtration, but the aluminum sulfate addition is relatively large. More, th...

Claims

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Application Information

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IPC IPC(8): D21C11/00
Inventor 唐公义武文焕李守顺
Owner 济南大陆机电股份有限公司
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