CN101343122A - Regeneration treatment method and device for black liquor of papermaking - Google Patents

Regeneration treatment method and device for black liquor of papermaking Download PDF

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Publication number
CN101343122A
CN101343122A CNA2008101205427A CN200810120542A CN101343122A CN 101343122 A CN101343122 A CN 101343122A CN A2008101205427 A CNA2008101205427 A CN A2008101205427A CN 200810120542 A CN200810120542 A CN 200810120542A CN 101343122 A CN101343122 A CN 101343122A
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liquid
ultra
hollow
causticization
filtration
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贾向东
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/40Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

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Abstract

Disclosed is a regeneration treatment method of paper-making black liquor as well as an apparatus thereof, and the method comprises the steps that: firstly, the primary solid-liquid separation of mixture to a paper-making black liquor is implemented by adopting a belt filter press; secondly, the separated liquid enters a hollow-fiber membrane ultra-filtration separator through a retainer, and a hollow-fiber membrane adopting the chip type packaging is used to pump the solution by the negative pressure mode; thirdly, the separated filtrate is directly pumped into a reverse osmosis membrane system through a separating pump for concentrating a caustic soda solution; fourthly, the caustic soda solution is drained to a clear liquid storage tank after being concentrated by the reverse osmosis membrane, and the lye in the tank is tested to have the appropriate caustic soda concentration and can be directly pumped to the paper-making process for recycling; and fifthly, when the tested caustic soda has insufficient effective concentration, the lye is pumped to a causticization tank for causticizing treatment and then for recycling. The apparatus mainly comprises: a black liquor pond communicated with a paper-making production line, and the belt filter press used for the solid-liquid separation of lye in the black liquor pond; the hollow-fiber membrane ultra-filtration separator connected behind the belt filter press; and the clear liquid storage tank connected behind the reverse osmosis membrane which is connected behind the ultra-filtration separator, and the storage tank is connected with the causticization tank or directly connected with a lye scheduling pipeline as required.

Description

A kind of regeneration treating method of black liquid and device
Technical field
What the present invention relates to is method and the corresponding processing means that a kind of black liquid cyclic regeneration is handled, and especially a kind of hollow fiber ultrafiltration membrane-reverse osmosis membrane technology that mainly utilizes carries out black liquid regeneration treating method and device.
Background technology
China's paper industry is general at present adopts following method that black liquid is handled and reuse:
1, solid-liquid separation, be about in the black liquor earth, sandstone, remaining fiber etc. by someway with liquid separation.
2, solid substance reclaims or burning, the enterprise that has produces low-grade paper and goods thereof after with part available fiber recovery, and most enterprises then directly send it into boiler combustion, in order to concentrate the isolated liquid in front, whether this step process no matter fiber recovery all exists surprising energy consumption.
3, the liquid (main component is sodium hydroxide and yellow soda ash) after boiling concentrates feeds excess carbon dioxide, makes other contamination precipitation, makes sodium hydroxide all change yellow soda ash into simultaneously.
4, sodium carbonate solution is put into causticization pond lime causticization, made it change sodium hydroxide solution into, concentration is about 30%.
5, reuse sodium hydroxide solution is used for the papermaking operation.
As can be seen from the above description, there is great energy consumption in China's paper industry, need to build special workshop in order to keep the caustic soda reuse, scale of investment is big, the construction period is long, have bigger greenhouse gas emission, need bigger land area and use hazardous substance in a large number, as lime severe corrosive is arranged, the causticization process is generated heat in a large number, and dust pollution is big.
Though there is above-mentioned defective, owing to contain the caustic soda (20%~30%) of a large amount of high densitys in the black liquid, can not directly discharge, also enterprise cost is had very big influence, thereby papermaking enterprise can only be selected effective caustic soda component in the reuse black liquor.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned existence, effectively keeping under alkali lye active principle, the prerequisite of caustic soda, auxiliary agent and water and provide a kind of as dissolved state, remove impurity and suspended substance in the solution, concentrate and reuse alkali lye, significantly reduce the energy consumption that alkali lye reclaims and improve reuse alkali lye result of use, mainly utilize hollow fiber ultrafiltration membrane-reverse osmosis membrane technology to carry out the regeneration treating method and the device of black liquid.Described method comprises: 1 black liquid collecting tank top adopts belt filter press to realize the elementary solid-liquid separation of mixed solution, removes the most solid substances in the liquid, and the fiber fines that wherein contains can be back to papermaking; 2 liquid after separating enter hollow-fibre membrane ultra-filtration and separation device through barrier, utilize the hollow-fibre membrane that adopts chip (or other) encapsulation, extract solution with negative pressure mode; 3 through the filtrate after the hollow fiber ultrafiltration membrane separation, directly squeezes into reverse osmosis membrane system by separate pump, realizes concentrating of caustic soda soln, and isolated is pure water through liquid substantially, can be used for other operation, needn't discharge; 4 caustic soda solns after reverse osmosis membrane concentrates enter holding tank, and the alkali lye in this jar reaches suitable caustic soda concentration after testing can directly pump into the reuse of papermaking operation.
Hollow-fibre membrane separation accuracy of the present invention is 200 nanometers, and membrane material can be selected the macromolecular material of polypropylene or other alkali corrosion resistance for use; In described ultra-filtration and separation device bottom design mud discharging device is arranged, can get rid of the mud and the impurity of accumulation.
When alkali lye effective concentration in the holding tank of the present invention is not enough, when the naoh concentration deficiency that promptly contains in the alkali lye and concentration of sodium carbonate are too high, the caustic soda soln in the holding tank is pumped into causticization jar causticization, the solution reuse after the causticization.Dress lime can be changed at any time in the described causticization jar.
Device of the present invention mainly includes: one is communicated in the black liquor pond of paper production line, the belt filter press that alkali lye in the black liquor pond is used as solid-liquid separation; Be connected with a hollow-fibre membrane ultra-filtration and separation device behind the described belt filter press; And behind this ultra-filtration and separation device, be connected to a reverse-osmosis membrane element, after be connected to a clear liquid storage tank again.
Be connected to one behind the described belt filter press earlier and be used for the barrier that separating liquid may injure the solid substance of hollow-fibre membrane, be connected to hollow-fibre membrane ultra-filtration and separation device again; Between this ultra-filtration and separation device and reverse-osmosis membrane element, dispose a separate pump, and between reverse osmosis membrane and clear liquid storage tank, dispose one tunnel connected loop that is serially connected with recoil pump in addition.
Be provided with the liquid level controller in the described clear liquid storage tank; On the ultra-filtration and separation device, also dispose tap water replenisher and the main cross-flow circulation loop that constitutes by the cross-flow pump in addition.
Be connected to a clear liquid pump on the described clear liquid storage tank, this clear liquid pump exports one the tunnel and is connected to the alkali lye scheduling pipeline that is communicated with paper production line, and another road is connected in the causticization jar, and is connected to the alkali lye scheduling pipeline of paper production line by the causticization jar.
Described clear liquid storage tank below is connected with blow-off line, and this blow-off line can link to each other with ultra-filtration and separation device and black liquor pond.
The present invention has been owing to substituted high temperature evaporation technology with the tubular fibre film separating system, need not boiler etc. energy consumption equipment, save energy in a large number greatly; Increase concentration of lye monitoring work step in addition, only in needs, just alkali lye is done causticization and handled, need not in liquid, feed carbon dioxide, keep effective sodium hydroxide component, avoided dead wight loss; The present invention when the causticization, adopts the way that goes out on advancing under the causticization jar to the alkali lye that needs causticization, has guaranteed the effect of causticization, has reduced floor space again in a large number, has reduced the usage quantity of corrodibility material.Simultaneously, the causticization jar is an enclosed construction, and is safe in utilization, pollutes little; The present invention carries out full automatic control to total system, and the scheduling of sepn process and alkali lye can realize full-automation, the management information system that has reduced manual operation and can enter whole factory.
The present invention can ensure that alkali lye recycles for a long time, avoided the discharging of high density salkali waste, has stopped the risk that biochemical sewage treatment system that row's alkali causes lost efficacy, all other solid substances all can be realized resource utilization, significantly reduce enterprise's discharging, low noise, no dust significantly reduce enterprise energy consumption.
Because prior art need build between the alkali recovery vehicle, to invest hugely, medium-sized and small enterprises can not be accomplished this point, have caused the big discharging in little paper mill.The present invention invests little, and small business just can realize smoothly, because the discharging of having stopped black liquor makes little papermaking that the possibility of existence arranged, for large enterprises, the energy consumption of saving is very considerable, and can effectively improve land utilization ratio.
Description of drawings
Fig. 1 is that structure of the present invention is formed synoptic diagram.
Embodiment
The present invention will be described in detail below in conjunction with accompanying drawing: the regeneration treating method of black liquid of the present invention, it comprises: 1 black liquid collecting tank top adopts belt filter press to realize the elementary solid-liquid separation of mixed solution, remove the most solid substances in the liquid, the fiber fines that wherein contains can be back to papermaking; Liquid after 2 separation enters hollow-fibre membrane ultra-filtration and separation device through barrier, utilizes the hollow-fibre membrane that adopts chip or other encapsulation, extracts solution with negative pressure mode; 3 through the filtrate after the hollow fiber ultrafiltration membrane separation, directly squeezes into reverse osmosis membrane system by separate pump, realizes concentrating of caustic soda soln, and isolated water can be used for other operation, needn't discharge; 4 caustic soda solns after reverse osmosis membrane concentrates enter holding tank, and the alkali lye in this jar reaches suitable caustic soda concentration after testing can directly pump into the reuse of papermaking operation.
Hollow-fibre membrane separation accuracy 200 nanometers of the present invention, membrane material can be selected polypropylene or other macromolecular material for use; In described ultra-filtration and separation device bottom design mud discharging device is arranged, can get rid of the mud and the impurity of accumulation.
When alkali lye effective concentration in the holding tank of the present invention is not enough, when the naoh concentration deficiency that promptly contains in the alkali lye and concentration of sodium carbonate are too high, the caustic soda soln in the holding tank is pumped into causticization jar causticization, the solution reuse after the causticization.
Dress lime can be changed at any time in the described causticization jar.
Shown in the accompanying drawing 1, device of the present invention mainly includes: one is communicated in the black liquor pond 2 of paper production line 1, the belt filter press 3 that alkali lye in the black liquor pond 2 is used as solid-liquid separation; Be connected with a hollow-fibre membrane ultra-filtration and separation device 4 behind the described belt filter press 3; And behind this ultra-filtration and separation device 4, be connected to a reverse-osmosis membrane element 5, after be connected to a clear liquid storage tank 6 again.
Be connected to one behind the described belt filter press 3 earlier and be used for the barrier 7 that separating liquid may injure the solid substance of hollow-fibre membrane, be connected to hollow-fibre membrane ultra-filtration and separation device 4 again; Between this ultra-filtration and separation device 4 and reverse-osmosis membrane element 5, dispose a separate pump 8, and between reverse osmosis membrane 5 and clear liquid storage tank 6, dispose one tunnel connected loop that is serially connected with recoil pump 9 in addition.
The present invention disposes automatic control device, comprises the fluid level controller that is provided with in the described clear liquid storage tank 6; On ultra-filtration and separation device 4, also dispose tap water replenisher 10 and the main cross-flow circulation loop that constitutes by cross-flow pump 11 in addition.
The present invention is connected to a clear liquid pump 12 on described clear liquid storage tank 6, this clear liquid pump 12 one tunnel is connected to the alkali lye scheduling pipeline 13 that is communicated with paper production line, and another road is connected in causticization jar 14, and is connected to the alkali lye scheduling pipeline 13 of paper production line by causticization jar 14.
Described clear liquid storage tank 6 belows are connected with blow-off line 15, and this blow-off line 15 can link to each other with ultra-filtration and separation device 4 and black liquor pond 2.
Work of the present invention is made up of following steps:
1, judgment task state.As each liquid level, temperature, the intact degree of each element, reaching job requirement can start shooting;
2, Password Management.Has only validated user ability implementation and operation;
3, the regeneration of waste lye constantly circulates by separating and 2 parts that recoil are formed, disposes or clear liquid is filled up to turbid liquid;
4, the separation cross-flow is formed with pneumatic and 2 kinds of selections of liquid in pipe circulation;
5, the automatic cleaning and the maintenance of film system are all finished automatically by system;
6, replenishing and moisturizing of membrane separation apparatus alkali lye finished automatically by system;
7 and production line between the scheduling (comprising turbid liquid and clear liquid) of alkali lye provide manually and automatic 2 sets of plan, existing product according to customer requirement based on manually;
8, regularly comprehensive clean and maintenance of film system is finished automatically by system.
9, turbid flow container is used for storing the waste lye that production line is come temporarily, and the clear liquid jar is used for the clear liquid after the stores processor;
10, behind the production line emptying waste lye, do cleaning work, then the clear liquid blowback is used;
11, through aforementioned 1~8 step, manipulation of regeneration is stand-by to the clear liquid jar with the waste lye in the turbid flow container for film separating system;
12, production line generally changed alkali at 3~10 days, and system can handle the waste lye of other production lines in turn in the cycle once more;
13, the waste lye in the turbid flow container must be done primary separation through solid-liquid separator before entering membrane separation apparatus;
14, system through 6~12 months use after, can be according to circumstances suitably blowdown, a blowdown flow rate is less than 1 cubic metre, compares with the blowdown flow rate of original 1 ten thousand stere, near 0 discharging.
Current, developed the system of 4 kinds of specifications, all adopt the full automatic control mode of PLC+ touch-screen, the day output of alkali lye is 10,15,20,40 cubic metres, this design is corresponding with the wash bottle line processing power of domestic current.
The processing power of product differs greatly, but working process is identical, all consists of the following components in order:
1, production line, alkali pump and alkali lye scheduling pipeline are used for pending alkali lye is pumped into the black liquor pond;
2, black liquor pond and temperature thereof and liquid level control is used to store waste lye, guarantees that system works is in shutting down below 65 ℃ and when the black liquor child is empty.
3, belt filter press, it makes solid-liquid separation with alkali lye in the black liquor pond, the recyclable or recycling treatment of solid substance;
4, barrier is used for the solid substance that separating liquid may injure membrane module;
5, hollow-fibre membrane ultra-filtration and separation device is used to remove large granular impurity;
6, separate pump and automatic valve, the negative pressure and the reverse osmosis membrane separation pressure that provide membrane sepn to need;
7, reverse osmosis membrane system is used for concentrating alkali lye, and the water of discharge can be used for other operation;
8, clear liquid storage tank and liquid level thereof control, system-down when assurance clear liquid jar is full;
9, recoil pump and automatic valve thereof, the automatic cleaning and the maintenance of film, the back flushing of film utilizes the clear liquid in the clear liquid jar;
10, tap water replenisher, the cleaning and the liquid level that are used for membrane separation apparatus are supplied;
11, the cross-flow recycle system guarantees effective work of membrane separation apparatus;
12, full-automatic control system, all signals and control all insert the housing under the platform that is positioned at membrane separation apparatus, automatic control device in the housing adopts Controlled by Programmable Controller, and outfit hand push button and touch-screen, two cover operating gear, touch-screen also is used for the demonstration of working state of system simultaneously except that being used for red-tape operati;
13, the dense monitoring of clear liquid pump and alkali is used for pumping into causticization jar causticization with available white liquor blowback production line or with unavailable alkali lye;
14, the causticization jar is used for and will sends into production line after the alkali lye causticization that causticization is handled perhaps, but by product major ingredient lime carbonate recycling treatment;
15, blow-off line is used for overflow and blowdown.

Claims (9)

1, a kind of regeneration treating method of black liquid, it is characterized in that described method comprises: one, the black liquor in the black liquid pond adopts belt filter press to carry out the elementary solid-liquid separation of mixed solution, remove the most solid substances in the liquid, the fiber fines that wherein contains can be back to papermaking; Two, the liquid after the separation enters hollow-fibre membrane ultra-filtration and separation device through barrier, adopts the hollow-fibre membrane of chip or other encapsulation, extracts solution with negative pressure mode; Three, through the filtrate after the hollow fiber ultrafiltration membrane separation, directly squeeze into reverse osmosis membrane system by separate pump, carry out concentrating of caustic soda soln, isolated water can be used for other operation, needn't discharge; Four, the caustic soda soln after reverse osmosis membrane concentrates enters the clear liquid storage tank, and the alkali lye in this jar has suitable caustic soda concentration can directly pump into the reuse of papermaking operation after testing.
2, according to the regeneration treating method of the described black liquid of claim 1, it is characterized in that described hollow-fibre membrane separation accuracy 200 nanometers, membrane material can be selected polypropylene or other macromolecular material for use; In described ultra-filtration and separation device bottom design mud discharging device is arranged, can get rid of the mud and the impurity of accumulation.
3, according to the regeneration treating method of the described black liquid of claim 1, when it is characterized in that the alkali lye effective concentration deficiency in the described clear liquid storage tank, be that the naoh concentration deficiency that contains in the alkali lye and concentration of sodium carbonate are when too high, caustic soda soln in this jar is pumped into causticization in the causticization jar, the solution reuse after the causticization.
4, according to the regeneration treating method of the described black liquid of claim 3, it is characterized in that dress lime in the described causticization jar, can change at any time.
5, a kind ofly realize that it mainly includes: one is communicated in the black liquor pond of paper production line as the device of the regeneration treating method of black liquid as described in claim 1 or 2 or 3 or 4, the belt filter press that alkali lye in the black liquor pond is used as solid-liquid separation; It is characterized in that being connected with a hollow-fibre membrane ultra-filtration and separation device behind the described belt filter press; And behind this ultra-filtration and separation device, be connected to a reverse osmosis membrane, after be connected to a clear liquid storage tank again.
6, according to the device of the regeneration treating method of the described realization black liquid of claim 5, it is characterized in that being connected to one earlier behind the described belt filter press is used for the barrier that separating liquid may injure the solid substance of hollow-fibre membrane, is connected to hollow-fibre membrane ultra-filtration and separation device again; Between this ultra-filtration and separation device and reverse osmosis membrane, dispose a separate pump, and between reverse osmosis membrane and clear liquid storage tank, dispose one tunnel connected loop that is serially connected with recoil pump in addition.
7, according to the device of the regeneration treating method of claim 5 or 6 described realization black liquids, it is characterized in that being provided with fluid level controller in the described clear liquid storage tank; On the ultra-filtration and separation device, also dispose tap water replenisher and the main cross-flow circulation loop that constitutes by the cross-flow pump in addition.
8, according to the device of the regeneration treating method of the described realization black liquid of claim 7, it is characterized in that being connected to a clear liquid pump on the described clear liquid storage tank, this clear liquid pump one tunnel is connected to the alkali lye scheduling pipeline that is communicated with paper production line, another road is connected in the causticization jar, and is connected to the alkali lye scheduling pipeline of paper production line by the causticization jar.
9, the device of the regeneration treating method of described according to Claim 8 realization black liquid it is characterized in that described clear liquid storage tank below is connected with blow-off line, and this blow-off line can link to each other with ultra-filtration and separation device and black liquor pond.
CNA2008101205427A 2008-08-19 2008-08-19 Regeneration treatment method and device for black liquor of papermaking Pending CN101343122A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101812813A (en) * 2010-04-07 2010-08-25 中南大学 Method and device for treating paper-making black liquid acid-precipitation waste liquid film
CN104674590A (en) * 2013-12-03 2015-06-03 新世膜科技股份有限公司 Treatment method and treatment equipment for papermaking black liquid
CN105600806A (en) * 2016-03-10 2016-05-25 河南工程学院 Reaction device for preparing industrial sodium hydroxide from carbide slag
CN106865892A (en) * 2017-03-07 2017-06-20 轻工业环境保护研究所 Reducing rules black liquor by wet method alkali reclaiming method
CN109423905A (en) * 2017-08-30 2019-03-05 黑龙江如柏科技有限公司 A kind of paper pulp production line system of no discharging of waste liquid

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101812813A (en) * 2010-04-07 2010-08-25 中南大学 Method and device for treating paper-making black liquid acid-precipitation waste liquid film
CN104674590A (en) * 2013-12-03 2015-06-03 新世膜科技股份有限公司 Treatment method and treatment equipment for papermaking black liquid
CN104674590B (en) * 2013-12-03 2018-01-26 新世膜科技股份有限公司 The processing method and its processing equipment of black liquid
CN105600806A (en) * 2016-03-10 2016-05-25 河南工程学院 Reaction device for preparing industrial sodium hydroxide from carbide slag
CN105600806B (en) * 2016-03-10 2017-06-06 河南工程学院 Carbide slag prepares industrial sodium hydroxide reaction unit
CN106865892A (en) * 2017-03-07 2017-06-20 轻工业环境保护研究所 Reducing rules black liquor by wet method alkali reclaiming method
CN109423905A (en) * 2017-08-30 2019-03-05 黑龙江如柏科技有限公司 A kind of paper pulp production line system of no discharging of waste liquid

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Open date: 20090114