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Process and device for treating black liquor

A technology of black liquor and black liquor tank, which is applied in the field of black liquor processing technology and its devices, can solve the problems of environmental damage, high cost of chemicals, high COD and salinity, and achieve the effects of lightening load, reducing burden and reducing COD.

Pending Publication Date: 2019-05-10
阿拉尔市中泰纺织科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The black liquor after cooking has high COD and salt content, and it is discharged directly, which not only makes it difficult to treat in the sewage workshop, but also causes great harm to the environment
In the existing technology, the cost of the agent is extremely high, and the solid formed after simple cooking still has the problem of high COD, which urgently needs to be solved

Method used

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  • Process and device for treating black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 Shown, a kind of process of processing black liquor comprises the following steps:

[0040] A, raw material waste liquid in 1000kg papermaking process enters described first black liquor squeezer 1 and described second black liquor squeezer 3 successively through described raw material liquid feeding pump 18 and squeezes to obtain 500kg dilute black liquor ;

[0041]B, the 500kg dilute black liquor in step A is passed in the described sedimentation tank 5 by described dilute black liquor feeding pump 4, then in the described sedimentation tank 5, add the calcium hydroxide of 80g, generate calcium carbonate solid Precipitation, after 3h of precipitation, the 230kg supernatant of the settling tank 5 is passed through the second delivery pump 6 into the desulfurization tower 7 as a desulfurizer to obtain 184kg desulfurization waste liquid;

[0042] C, the 184kg desulfurization waste liquid that obtains in the step B is passed in the described filter pres...

Embodiment 2

[0047] The difference with Example 1 is that the calcium carbonate solid precipitation at the bottom of the settling tank 5 is passed into the filter press 9 by the precipitation feed pump 16 to obtain calcium carbonate solids and clear liquid, and the filter press The clear liquid in 9 is passed in the described settling tank 5 by the reflux pump 17, and the calcium carbonate solid is passed in the collection tank 12 by the fourth delivery pump 11. The method realizes the full treatment of raw material waste liquid and the collection of calcium carbonate in the papermaking process, and realizes waste utilization.

Embodiment 3

[0049] Such as figure 1 Shown, a kind of process of processing black liquor comprises the following steps:

[0050] A, raw material waste liquid in 1000kg papermaking process enters described first black liquor squeezer 1 and described second black liquor squeezer 3 successively through described raw material liquid feeding pump 18 and squeezes to obtain 510kg dilute black liquor ;

[0051] B, the 510kg dilute black liquor in step A is passed in the described sedimentation tank 5 by described dilute black liquor feeding pump 4, then in the described sedimentation tank 5, add the calcium hydroxide of 82g, generate calcium carbonate solid Precipitation, after 3h of precipitation, the 225kg supernatant of the settling tank 5 is passed into the desulfurization tower 7 through the second delivery pump 6 as a desulfurizer to obtain 174kg desulfurization waste liquid;

[0052] C, the 174kg desulfurization waste liquid that obtains in the step B is passed in the described filter pre...

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Abstract

The invention belongs to the field of black liquor treatment in the papermaking industry, and particularly relates to a system for treating black liquor and a process for treating the black liquor bythe system. The process includes sequentially passing raw material waste liquid in a papermaking process through a first black liquor press and a second black liquor press to obtain diluted black liquor; injecting the diluted black liquor into a sedimentation tank and adding calcium hydroxide; injecting supernatant liquid, as a desulfurizing agent, of the sedimentation tank into a vulcanization tower to obtain the desulfurized waste liquid; collecting the desulfurized waste liquid by a diluted black liquid tank, allowing the desulfurized waste liquid to enter a black liquor five-effect evaporator for evaporation, and collecting condensates in the evaporation process; drying the condensates by a drying tower to obtain finished solids. The black liquor is treated by the process based on a device, and the COD is reduced to a composite discharge standard; the resulting solids can be used as fertilizer to achieve waste utilization; the problems concerning the black liquor treatment in the current paper industry are solved.

Description

technical field [0001] The invention belongs to the field of black liquor treatment in the papermaking industry, and in particular relates to a process and a device for treating black liquor. Background technique [0002] In the paper industry, during the kraft or caustic soda pulping process, the washing liquid of the pulp after washing and cooking is black, which is called black liquor. Black liquor contains inorganic substances in cooking liquor, lignin, hemicellulose and cellulose degradation products and organic acids dissolved from plant fiber raw materials. Inorganic substances include free sodium hydroxide, sodium sulfate, sodium sulfide, sodium carbonate, sodium and silicon dioxide combined with organic substances. The black liquor after cooking has a high COD and salt content, and it is directly discharged, which not only makes it difficult to treat in the sewage workshop, but also causes great harm to the environment. In the prior art, the cost of the medicament...

Claims

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Application Information

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IPC IPC(8): D21C11/10
Inventor 王彦波吴宏辉杨振忠李建军侯磊王亮冉静平詹兵余永红李森林高艳漆勇梅胡晓燕
Owner 阿拉尔市中泰纺织科技有限公司
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