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Method for black liquor treatment

A treatment method and black liquor technology, which are applied in the regeneration of lye and the recycling of pulp by-products, etc., can solve the problems of high treatment cost, leakage of odorous substances, and large equipment cost.

Inactive Publication Date: 2007-06-27
K I SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the equipment cost of the measures in the prior art is huge, and the malodorous substance leaks out of the treatment facility, uses too much water, and most of the lignin is incinerated and discharged into the atmosphere as exhaust gas, all of which require treatment costs. great

Method used

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  • Method for black liquor treatment

Examples

Experimental program
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Embodiment 1

[0031] FIG. 1 shows a system configuration diagram of the embodiment, and FIG. 2 shows its flowchart.

[0032] First, in Fig. 1, the number 1 from the left is a black liquor storage tank, in which black liquor is stored.

[0033] Next, reference number 2 is a pH adjustment tank, in which black liquor and dilution water are filled, acids such as hydrochloric acid and sulfuric acid are added, and a coagulant is added and slowly stirred to deposit lignin and other substances. At this time, it is desirable to add a trace amount of hydrofluoric acid as an acid.

[0034] Subsequently, reference numeral 3 is a dehydrator 3 in which lignin is taken out as a solid by, for example, pressure filtration.

[0035] Reference numeral 4 is an ozone reaction tank, and a liquid from which lignin has been removed by pressure filtration is introduced, and ozone is used as microbubbles to perform a contact reaction.

[0036] At this stage, since ozone gas, which is a powerful oxidizing species, ...

Embodiment 2

[0042] The processing of black liquor is carried out according to the flowchart shown in FIG. 3 .

[0043] First, add 50t of dilution water to the stock solution of 10t black liquor (containing 20% ​​solid content) to obtain a total of 60t of treated liquid, add 900kg of hydrochloric acid therein, add 1.8kg of polymer coagulant while stirring, then place, Separation into a liquid part and a solid part.

[0044]The obtained liquid part 48t is subjected to sand filtration, microbubble ozone gas is introduced into the filtered water obtained through sand filtration for oxidation treatment, and then 300 kg of caustic soda is added for neutralization treatment. Next, the neutralized water was passed into an activated carbon tower to perform adsorption treatment of impurities to obtain purified water.

[0045] This purified water is used as the above-mentioned dilution water or pulp manufacturing water.

[0046] On the other hand, 12 t of solids obtained from the above solid-liqui...

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Abstract

It is intended to efficiently isolate lignin and alkali from an alkaline black liquor discharged in the papermaking / paper pulp mill industry and use a treated water as a clean water. An acid is added to the black liquor so as to adjust the pH value thereof to 2.5-3.5. A flocculant is added thereto so as to precipitate any lignin contained in the black liquor, thereby effecting separation into the lignin and clean water. The clean water is subjected to catalytic reaction with ozone, preferably in the form of microbubbles.

Description

technical field [0001] At present, for the treatment of black liquor discharged from the paper and pulp manufacturing industry, since the properties of the black liquor contain many harmful substances, the countermeasures are to make a huge investment in equipment, recover the alkali, concentrate the black liquor, and carry out Incineration treatment using energy is included, but the cost of these treatments is very high and air pollutants and malodorous substances are discharged into the atmosphere. The present invention relates to providing a treatment method for the black liquor. Background technique [0002] Black liquor is discharged from the wood cooking (removal of lignin) process. The essence of the black liquor is the cooking liquor. Because the cooking liquor uses caustic soda to dissolve lignin in water, and then uses sodium sulfide to promote delignification, so the black liquor contains not only lignin, but also sodium sulfide produced by hydrolysis. Hydrogen s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04
CPCD21C11/04D21C11/0007
Inventor 北川定夫赤穗章
Owner K I SYST
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