Process for treating chemical fiber cotton pulp black liquor

A treatment process and black liquor technology, which are applied in the fields of water/sewage multi-stage treatment, heating water/sewage treatment, processing wastewater treatment, etc., which can solve the problems of increased treatment costs, low combustion value, and difficulty in meeting national discharge standards for wastewater.

Active Publication Date: 2009-11-25
山东光华纸业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment method of chemical fiber cotton pulp black liquor is generally mixed with the acidic water produced in the follow-up, and discharged after the middle water treatment, the environmental protection treatment cost is high, and the treated wastewater is difficult to meet the national discharge standard
In recent years, many chemical fiber enterprises have tried to use alkali recovery system to treat chemical fiber cotton pulp black liquor. However, due to the low organic content and low combustion value of chemical fiber cotton pulp black liquor, it is necessary to add a large amount of heavy oil to support combustion when using alkali recovery system. Significant increase in processing fees

Method used

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  • Process for treating chemical fiber cotton pulp black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using the above process, when the chemical fiber cotton pulp black liquor and wood pulp black liquor are mixed in a ratio of 1: 2.0-1: 2.66, they are evaporated by an evaporator until the solid content in the mixed black liquor is between 43% and 44%. The solid content of the furnace concentrated black liquor is between 45% and 46%. It is difficult to dry the black liquor during the combustion process of the alkali recovery furnace. Around 65%.

Embodiment 2

[0019] Using the above process, when the chemical fiber cotton pulp black liquor and wood pulp black liquor are mixed in a ratio of 1:2.7-1:3.0, the solid content in the mixed black liquor is evaporated by an evaporator until the solid content is between 46%-47%. The solid content of the furnace concentrated black liquor is between 53% and 54%. During the combustion process of the alkali recovery furnace, the black liquor is well dried, no need to add heavy oil to support the combustion, and there is no phenomenon of alkali ash flying off. The steam production is relatively high, and the alkali recovery rate is in the About 80%.

Embodiment 3

[0021] Using the above process, when the mixing ratio of chemical fiber cotton pulp black liquor and wood pulp black liquor is more than 1:3.5, the solid content in the mixed black liquor is evaporated by the evaporator until the solid content of the mixed black liquor is above 48%, and the solid content of the concentrated black liquor entering the furnace is at More than 55%, the black liquor is well dried during the combustion process of the alkali recovery furnace, without the need for aggravated oil to support combustion, and there is no phenomenon of alkali ash flying off, the gas production is higher than that of Example 2, and the alkali recovery rate is above 80%.

[0022] In summary, when the mixing ratio of chemical fiber cotton pulp black liquor and wood pulp black liquor is 1:2.7-1:3.5, the alkali recovery system can be used to effectively treat chemical fiber cotton pulp black liquor and wood pulp black liquor, and recover The NaOH solution is used as alkali for p...

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Abstract

The invention discloses a process for treating chemical fiber cotton pulp black liquor, which comprises the following steps: filtering the chemical fiber cotton pulp black liquor and wood pulp black liquor by a black liquor filter, mixing the two black liquors according to a proportion, then evaporating the mixture through a two-stage evaporator, spraying the thick black liquor after evaporating into an alkali reclaiming furnace, drying the thick black liquor sprayed into the furnace by using heat in the furnace, drying, fully burning and oxidizing the thick black liquor during falling, and introducing the burned molten substances into a dissolving tank to form green liquor; and conveying the green liquor in the dissolving tank to a slaking slag extractor, simultaneously adding enough amount of calcium oxide into the slaking slag extractor so as to carry out chemical reaction on the that the green liquor and the calcium oxide, and conveying emulsion generated in the reaction to a causticizer to generate NaOH. The process overcomes the defects of low combustion value and high treatment cost existing in the process of treating the chemical fiber cotton pulp black liquor only by using an alkali reclaiming system, lowers the production cost and reduces environment pollution; and the obtained alkali liquor can be recycled.

Description

technical field [0001] The invention relates to a papermaking sewage treatment process, in particular to a treatment process for chemical fiber cotton pulp black liquor. Background technique [0002] The content of COD, BOD and alkali in the black liquor of chemical fiber cotton pulp is high, and the pollution to the environment is very serious. At present, the treatment method of chemical fiber cotton pulp black liquor is generally mixed with the acidic water produced in the follow-up, and discharged after the middle water treatment. The environmental protection treatment cost is high, and the treated wastewater is difficult to meet the national discharge standard. In recent years, many chemical fiber enterprises have tried to use alkali recovery system to treat chemical fiber cotton pulp black liquor. However, due to the low organic content and low combustion value of chemical fiber cotton pulp black liquor, it is necessary to add a large amount of heavy oil to support com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D1/04C02F1/04C02F103/28
Inventor 赵学杰马修国周传宝张继国王永梅张建华郑万坤秦国文
Owner 山东光华纸业集团有限公司
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