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Microfiltration film separation technology for straw pulp balck liquor

A separation technology, straw pulp black liquor technology, applied in the field of water treatment and sewage treatment for environmental protection, can solve problems such as interference, difficult control operation, etc., reduce equipment investment and energy consumption, low requirements for process conditions, and occupy an area small effect

Inactive Publication Date: 2004-04-07
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to solve the problems of evaporation energy consumption, difficult control operation and "silicon interference", and the recycling is fast and direct without loss of recycled materials, so as to be suitable for small and medium-sized paper manufacturers in China who use rice straw as raw material

Method used

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Embodiment Construction

[0031] Its specific implementation and operation methods are as follows:

[0032] In the first step, the black liquor is introduced into the storage tank.

[0033] The black liquor (pH at 11, temperature 65 degrees Celsius) extracted by steaming rice straw and extracting machinery (extracting machinery is the original machinery of the manufacturer itself, which can be vacuum drum type, extrusion type, double screw type, horizontal belt type, etc.) , Baume degree 8) introduce black liquor storage tank (single storage tank volume 10 cubic meters, totally four, the material of storage tank itself is carbon steel, and the geometric shape of storage tank itself is cubic type.), at this moment in the storage tank The COD of the black liquor is 100,000 mg per liter, the lignin is 18 grams per liter, the silicon content is 3.5 grams per liter, the total alkali content is 20 grams per liter, and the effective alkali content is 4 grams per liter. The purpose of the first operation is t...

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Abstract

The microfiltration film separation technology for straw pulp black liquor features the technological process includes five relatively independent steps: treating black liquor, reusing effective matters from the black liquor, steaming, blowing and extracting. The specific technological process includes: leading black liquor into storage tank and mixing homogeneously; pumping black liquor to microfiltration film separation with microfiltration film of alumina or zirconia material and of pore size 0.1-100 microns to obtain permeated liquid, with the flow rate, pressure and temperature being controlled in 5-15 m / s, 0.1-0.8 MPa and 30-120 deg.c separately; and returning the permeated liquid to steaming step for feuse. The present invention has the advantages of low equipment investment, simple technological process, no 'silicon interference' problem, and high COD and lignin eliminating rate.

Description

technical field [0001] The invention belongs to the technical field of water treatment and sewage treatment for environmental protection, and in particular provides a microfiltration membrane separation technology for straw pulp black liquor, which is suitable for black liquor treatment and reuse in straw pulp paper mills. Background technique [0002] The black liquor produced by paper mills using rice straw and wheat straw as raw materials when cooking grass raw materials is a unique waste liquor in China's papermaking industry. The black liquor has complex organic and inorganic compositions, low calorific value, high viscosity, and high silicon content. The serious environmental pollution is difficult. For effective treatment, the traditional treatment method is "alkali recovery", but "alkali recovery" is a technology developed abroad based on wood pulp papermaking, which is not suitable for the characteristics of straw pulp papermaking and has many shortcomings. There ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44D21C11/00
Inventor 施汉昌刘广立石磊徐农
Owner TSINGHUA UNIV
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