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Evaporation pretreatment process method for alkaline peroxide mechanical pulp

A process method and pretreatment technology, applied in the direction of concentrated waste liquid, etc., can solve the problems of low alkali recovery efficiency, large consumption, waste, etc., and achieve the effects of high recovery efficiency, improved utilization efficiency, and high alkali recovery efficiency

Inactive Publication Date: 2011-11-02
SHANDONG TAIYANGZHIYE
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Problems solved by technology

[0003] At present, in the alkali recovery process of chemical and mechanical pulp, the collected waste liquid is directly entered into the alkali recovery process. On the one hand, due to this method, there are many impurities in the waste liquid, mixed with a lot of slag, and most of the waste liquid is water. , and in the chemical-mechanical pulping system, the consumption of water is very large, if the water in the waste liquid is not utilized, it will also cause a great waste, and the efficiency of alkali recovery from the waste liquid with low concentration directly also lower

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Embodiment Construction

[0017] For ease of description, the following describes the invention of the chemical machine pulp alkali recovery evaporation pretreatment process method in detail with reference to the accompanying drawings:

[0018] As shown in the figure, a chemical pulp alkali recovery evaporation pretreatment process method includes a waste liquid recovery process and an alkali recovery process. The waste liquid recovery process collects filtered water from the chemical pulp production process to the waste liquid intermediate tank In the alkali recovery process, the collected waste liquid in the waste liquid intermediate pool is subjected to alkali recovery treatment, and the alkali recovery treatment also includes the following evaporation pretreatment steps:

[0019] (A) Pressure filtration of the waste liquid, the waste liquid in the waste liquid intermediate tank is filtered through a pressure screen, the slag produced by the filtering is discharged into the sieving residue t...

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Abstract

The invention provides an evaporation pretreatment process method for alkaline peroxide mechanical pulp, which comprises a waste liquor recovery process and an alkali recovery process, wherein in the waste liquor recovery process, filter water in the production process of the alkaline peroxide mechanical pulp is collected to a waste liquor intermediate pond, and in the alkali recovery process, collected waste liquor in the waste liquor intermediate pond is subjected to alkali recovery treatment. Before the alkali recovery treatment, the method also comprises the following evaporation pretreatment steps of: (a) performing pressure filtering on waste liquor, namely filtering the waste liquor in the waste liquor intermediate pond by a pressure sieve, discharging dregs formed during filtering to a dreg sieving pond, and discharging the filtered waste liquor to a waste liquor tower to enter the step (b); and (b) performing evaporation grading treatment on the filtered waste liquor by an evaporator, wherein heavily-polluted concentrated solution is discharged to a concentrated solution pond for alkali recovery treatment, mildly-polluted concentrated solution is discharged to a wood chip washing water tank to clean wood chips, and after being mixed with disk mill dilution water in a white water tower, white water generated during evaporation is discharged to a hot white water tank and enters a pulping system of the alkaline peroxide mechanical pulp. The evaporation pretreatment process method has the advantages of high alkali recovery efficiency and environment friendliness.

Description

Technical field [0001] The invention relates to the field of pulping, in particular to the treatment of waste liquid in the field of chemical mechanical pulp, and specifically refers to a process method for pretreatment of chemical mechanical pulp alkali recovery and evaporation. Background technique [0002] As the APMP (Alkaline Hydrogen Peroxide Mechanical Pulp) workshop generates a lot of waste water, waste residue, and waste gas during the production of chemical pulp, in order to protect the environment and save costs for the company, there are a series of services such as alkali recovery. In the pulping section, on the one hand, wastewater is treated to meet environmental protection requirements and discharged. In addition, alkali recovery also allows waste to be reused, which improves the economic benefits of the enterprise. [0003] At present, the chemical pulp alkali recovery treatment process is to directly enter the collected waste liquid into the alkali recovery treatm...

Claims

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Application Information

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IPC IPC(8): D21C11/10
Inventor 应广东陈克复刘泽华李军乔军曹衍军安庆臣徐峻李明阳钟洪霞
Owner SHANDONG TAIYANGZHIYE
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