CN108358367A - A kind of processing method and processing system of black liquid - Google Patents
A kind of processing method and processing system of black liquid Download PDFInfo
- Publication number
- CN108358367A CN108358367A CN201810108805.6A CN201810108805A CN108358367A CN 108358367 A CN108358367 A CN 108358367A CN 201810108805 A CN201810108805 A CN 201810108805A CN 108358367 A CN108358367 A CN 108358367A
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- Prior art keywords
- black liquor
- black
- tank
- phenol water
- cooling
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
Abstract
The invention discloses a kind of processing method of black liquid and processing systems, the wherein processing system of the black liquid, including：First effect tank, the second effect tank and efficient shallow ion airfloat equipment, the efficient shallow ion airfloat equipment are connected to the first effect tank, the second effect tank respectively；Wherein, the first effect tank is vacuum state, for receiving black liquor and carrying out cooling processing to the black liquor；The efficient shallow ion airfloat equipment is used to receive the black liquor after cooling, and carries out purified treatment to the black liquor, to remove the solid suspension in the black liquor, forms the first thin phenol water and dross；The second effect tank is used to receive first thin phenol water of a portion, and is evaporated concentration to first thin phenol water of reception.By the above-mentioned means, the present invention is evaporated concentration again after capable of removing the solid suspension in black liquor caused by reducing rules, to avoid solid suspension from blocking evaporation effect tank.
Description
Technical field
The present invention relates to pulp technology for making paper, more particularly to the processing method and processing system of a kind of black liquid.
Background technology
The resource utilization of reducing rules is high, and yield is up to 80-95%, is twice of chemical pulp, and the pollution COD generated is only
It is the 1/10-1/6 of chemical pulp.In recent years, with the development of reducing rules technology, water consumption gradually decreases, and waste strength gradually rises
It is high so that the process problem of highly concentrated reducing rules waste water gradually highlights.Black liquor temperature caused by reducing rules is high, solid suspends
Object (TSS) content is high, pollutional load is big, and wherein also contains resin, lignin, cellulose, hemicellulose, sulfur-bearing object, chelating
Agent, resin acid, tannin etc., traditional black liquor treatment method can no longer meet country now and wanted to the stringent of pollutant emission
It asks.
Currently, meeting strict demand of the country to pollutant emission now, mainly by chemical recovery system to reducing rules
Generated black liquor is handled.
Present inventor has found the solid suspension in black liquor caused by reducing rules in long-term R＆D process
Content it is higher, easily cause evaporation effect tank block, and then influence vapo(u)rization system the cycle of operation.
Invention content
The present invention provides a kind of processing method and processing system of black liquid, can solve reducing rules institute in the prior art
Solid suspension in the black liquor of generation causes the evaporation effect susceptible to plugging technical problem of tank.
In order to solve the above technical problems, one aspect of the present invention is：A kind of processing of black liquid is provided
System, including：First effect tank, the second effect tank and efficient shallow ion airfloat equipment, the efficient shallow ion airfloat equipment
It is connected to respectively with the first effect tank, the second effect tank；
Wherein, the first effect tank is vacuum state, for receiving black liquor and carrying out cooling processing to the black liquor；
The efficient shallow ion airfloat equipment is used to receive the black liquor after cooling, and is purified to the black liquor
Processing forms the first thin phenol water and dross to remove the solid suspension in the black liquor；
The second effect tank is used to receive first thin phenol water of a portion, and described first to reception is dilute black
Liquid is evaporated concentration.
Wherein, the vacuum ranges of the first effect tank are (- 0.90)-(- 0.93) bar, the black liquor after cooling
Temperature range be 47-50 DEG C.
Wherein, the content range of the solid suspension in the black liquor is 1000-2000ppm, in first thin phenol water
Solid suspension content range be 150-300ppm.
Wherein, the system further comprises：
Dehydration device is carried out dehydrating for receiving the dross, and to the dross, forms solids and second dilute
Black liquor.
Wherein, the efficient shallow ion airfloat equipment includes：
Microbubble manufacturing device, for manufacturing the microbubble for carrying charge；
Pool inlet tube road, the flocculation aid for conveying the black liquor after cooling down and being added so that the black liquor is in institute
It states and flocculation reaction occurs under the action of flocculation aid, form floc sedimentation；
Flotation tank is connected to the microbubble manufacturing device, the pool inlet tube road, for receiving the black liquor and described micro-
Bubble so that the floc sedimentation of generation is reacted in the black liquor in the suction-operated low suspension of the microbubble in the black liquor
Liquid level.
In order to solve the above technical problems, another technical solution used in the present invention is：A kind of place of black liquid is provided
Reason method, including：
Cooling processing is carried out to black liquor；
Purified treatment is carried out to the black liquor after cooling, to remove the solid suspension in the black liquor, forms first
Thin phenol water and dross；
Concentration is evaporated to first thin phenol water of a portion.
Wherein, after carrying out cooling processing to black liquor, the temperature range of the black liquor is 47-50 DEG C.
Wherein, the content range of the solid suspension in the black liquor is 1000-2000ppm, in first thin phenol water
Solid suspension content range be 150-300ppm.
Wherein, the processing method further comprises：
The dross is carried out dehydrating, solids and the second thin phenol water are formed.
Wherein, the purified treatment includes：
Manufacture carries the microbubble of charge；
The flocculation aid for conveying the black liquor after cooling and being added so that effect of the black liquor in the flocculation aid
Lower generation flocculation reaction forms floc sedimentation；
Receive the black liquor and the microbubble so that the floc sedimentation of generation is reacted in the black liquor in the microbubble
Suction-operated low suspension the black liquor liquid level.
The beneficial effects of the invention are as follows：The case where being different from the prior art, the processing system of black liquid provided by the invention
System, including：First effect tank, the second effect tank and efficient shallow ion airfloat equipment, the efficient shallow ion airfloat equipment point
It is not connected to the first effect tank, the second effect tank；Wherein, the first effect tank is vacuum state, for receiving black liquor simultaneously
Cooling processing is carried out to the black liquor；The efficient shallow ion airfloat equipment is used to receive the black liquor after cooling, and right
The black liquor carries out purified treatment, to remove the solid suspension in the black liquor, forms the first thin phenol water and dross；Described
Two effect tanks are used to receive first thin phenol water of a portion, and are evaporated concentration to first thin phenol water of reception
Processing.By the way that black liquor caused by reducing rules is directed into the first effect tank, because first effect tank be vacuum state, can quickly by
The temperature of black liquor is fallen, and the black liquor after cooling is then directed into efficient shallow ion airfloat equipment, efficient shallow ion air supporting
After equipment is to purifying black liquor processing, most of solid suspension in black liquor can be removed, in this way, again leading the first thin phenol water
Enter to the second effect tank and be evaporated concentration, because the content of the solid suspension in the first thin phenol water is solid much smaller than contained in black liquor
Body suspension content will imitate the case where tank blocks it is possible to prevente effectively from appearing in solid during evaporation and concentration and suspending, to
The cycle of operation duration of vapo(u)rization system can be increased, reduce operating cost.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.Wherein：
Fig. 1 is that the processing system of black liquid of the present invention unifies the structural schematic diagram of embodiment；
Fig. 2 is the step flow diagram of one embodiment of processing method of black liquid of the present invention；
Fig. 3 is the sub-step flow diagram of step S102 in steps flow chart schematic diagram shown in Fig. 2.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are obtained every other under the premise of not making performing creative labour
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of the processing system 100 of embodiment of the present invention black liquid.The present invention
It is preceding by most of solid suspension in black liquor that the processing system 100 of embodiment offer black liquid can be evaporated concentration
Removal.The processing system 100 of the black liquid includes the first effect tank 10, the effect tank of efficient shallow ion airfloat equipment 20 and second
30, efficient shallow ion airfloat equipment 20 is imitated tank 30 with the first effect tank 10, second respectively and is connected to；Wherein, the first effect tank 10 is true
Dummy status, for receiving black liquor and carrying out cooling processing to black liquor；After efficient shallow ion airfloat equipment 20 is for receiving cooling
Black liquor, and purified treatment is carried out to black liquor, to remove most solid suspension in black liquor, forms the first thin phenol water and floating
Slag；Second effect tank 30 is used to receive first thin phenol water of a portion, and is evaporated concentration to the first thin phenol water of reception
Processing.
It is well known that generated black liquor includes solid suspension, PCD and COD in reducing rules, wherein solid suspends
The content range of object is 1000-2000ppm, and the content of PCD is greater than or equal to 20000ppm, and the content of COD is greater than or equal to
The temperature of 10000ppm, thin phenol water at this time are greater than or equal to 80 DEG C.If black liquor to be directly evaporated to concentration, solid therein
The content of suspended matter is higher, easily blocks evaporation effect tank, so that the cycle of operation of vapo(u)rization system is shorter, in general, black liquor passes through
The concentration range of product that the obtains later combustion product in 60%-65%, alkali stove is concentrated by evaporation to steam than ranging from 3.1-
3.5T vapour/TDS must just shut down processing blockage problem in addition, the vapo(u)rization system of reducing rules is run to 30-40 days, because cleaning is imitated
Time needed for tank is longer, and task is heavy, and a large amount of manpower is needed uninterruptedly to act on, not only on human and material resources and financial resources
It causes to waste, and it is easier that employee is extremely tired, easily causes safety accident.
In present embodiment, by the way that black liquor caused by reducing rules to be delivered in the first effect tank 10, because of the first effect tank 10
For vacuum state, quickly the temperature of black liquor can be fallen, the black liquor after cooling is then delivered to efficient shallow ion air supporting
Equipment 20 can be by most of solid suspension in black liquor after efficient shallow ion airfloat equipment 20 is to purifying black liquor processing
Removal, in this way, the first thin phenol water, which is delivered to the second effect tank 30, again is evaporated concentration, because the solid in the first thin phenol water suspends
The content of object is much smaller than solid suspension content contained in black liquor, it is possible to prevente effectively from solid during appearing in evaporation and concentration
Body, which suspends, will imitate the case where tank blocks, so as to increase the cycle of operation duration of vapo(u)rization system, the cycle of operation of vapo(u)rization system
Up to 80-90 days, operating cost can be effectively reduced, in addition, the concentration range for the product that black liquor obtains later through evaporation and concentration
Combustion product steams than ranging from 3.5-4.0T vapour/TDS in 65%-70%, alkali stove.
Wherein, first the vacuum ranges of tank 10 are imitated as (- 0.90)-(- 0.93) bar, such as (- 0.90) bar, (-
0.92) bar or (- 0.93) bar etc., the temperature range of the black liquor after cooling are 47-50 DEG C, such as 47 DEG C, 48.5 DEG C or 50
DEG C etc..
It is dilute after the black liquor more than or equal to 80 DEG C enters the first effect tank 10 since the first effect tank 10 is vacuum state
Violent boiling can occur for black liquor, so that the temperature of thin phenol water is 45-50 DEG C directly near.
It is appreciated that the first effect tank 10 is connected to the second effect tank 30, so that process of the second effect tank 30 in evaporation and concentration
In generated steam be circulated to the first effect tank 10, and first is imitated generated steam when boiling in tank 10 and taken away.
It is appreciated that processing system 100 includes multiple the second effect tanks 30 being sequentially communicated, multiple the second effects being sequentially communicated
Tank 30 is evaporated concentration successively to the first thin phenol water, that is to say, that the first thin phenol water, which enters first second effect tank 30, to carry out
After evaporation and concentration, it is re-introduced into next second effect tank 30 and is evaporated concentration.Further, processing system 100 further includes
Tank 31 is imitated in the forced-circulation evaporation being connected to one second last effect tank 30, with to after multiple second effect tanks 30 are concentrated by evaporation
The first thin phenol water be further evaporated concentration.
Wherein, the content range of the solid suspension in the first thin phenol water is 150-300ppm, such as 150ppm, 200ppm
Or 300ppm etc..
It is appreciated that the content range of solid suspension is in 1000-2000ppm contained in black liquor, through efficient shallow
After 20 purified treatment of ion airfloat equipment, the content of solid suspension is well below change contained in generated first thin phenol water
The content of solid suspension contained in generated black liquor, the removal rate of solid suspension are up to 85% or more in machine slurry.
Further, processing system 100 further includes dehydration device 40, is carried out at dehydration for receiving dross, and to dross
Reason forms solids and the second thin phenol water.
Wherein, to further strengthen dehydrating effect, dehydration device 40 is added with flocculation aid, helps in dehydration process
Solidifying agent can be polyacrylamide, and further, flocculation aid is anionic polyacrylamide.In present embodiment, added
The content range of flocculation aid is 20-50ppm, such as 20ppm, 35ppm or 50ppm.Certainly, in other embodiments, help solidifying
Agent can also select other materials and content range, be not limited thereto.
In present embodiment, dehydration device 40 can be mechanical spiral squeezing dewatering machine, certainly, in other embodiment
In, dehydration device 40 can be other devices, be not limited thereto.
It is appreciated that after floc sedimentation caused by flocculation reaction is collected, dross is formed by after dehydration, carefully
Small fiber mass dryness fraction is up to 40% or more, in this way, can carry out solids to burn or sell outside, to realize the sharp again of resource
With.
Further, processing system 100 further includes concentration basin 50, and concentration basin 50 is arranged in dehydration device 40 and efficient shallow
Between ion airfloat equipment 20, the dross that is discharged for collecting efficient shallow ion airfloat equipment 20.
Further, processing system 100 further includes defecator 60 and storage tank 70, defecator 60, storage tank 70 and
One effect tank 10 is sequentially communicated, wherein and defecator 60 clarifies black liquor for receiving black liquor caused by reducing rules, with
It is delivered in storage tank 70, and then is delivered to the first effect tank 10.
In embodiments of the present invention, dehydration device 40 is connected to defecator 60, by caused by dehydration the
Two thin phenol waters are delivered in defecator 60, in order to carry out purified treatment again together with black liquor to the second thin phenol water.
Further, processing system 100 further includes surge tank 80, and the setting of surge tank 80 is in the second effect tank 30 and shallow-layer ion
Between airfloat equipment 20, after receiving the first thin phenol water, the first thin phenol water to be delivered under the action of pump (not shown)
In second effect tank 30.
Efficient shallow ion airfloat equipment 20 is Collecting flocculation, air supporting, skimming, precipitates, scrapes mud in the equipment of one, mainly
Including microbubble manufacturing device 21, pool inlet tube road 22, flotation tank 23, water-distributing device, skim mud device 25 and scum collector
26。
Wherein, microbubble manufacturing device 21 is used to manufacture the microbubble for carrying charge.
In present embodiment, microbubble can be the microbubble for carrying positive electricity.
It is appreciated that another part of the first thin phenol water is delivered to micro bubble apparatus, to convey liquid into micro bubble apparatus
Body, and then microbubble is delivered to flotation tank 23.In present embodiment, the amount for being delivered to the first thin phenol water of the second effect tank 20 is remote
Much larger than the amount for the first thin phenol water for being delivered to microbubble manufacturing device 21.
Pool inlet tube road 22, the flocculation aid for conveying the black liquor after cooling down and being added so that black liquor is in flocculation aid
Effect is lower to occur flocculation reaction, forms floc sedimentation.
In present embodiment, flocculation aid can be polyacrylamide, and further, flocculation aid is cation polypropylene acyl
Amine.The content range of the flocculation aid added is 10-60ppm, such as 10ppm, 30ppm or 60ppm.Certainly, in other implementations
In mode, flocculation aid can also select other materials and content range, be not limited thereto.
If it is appreciated that black liquor caused by reducing rules is fed directly to efficient shallow ion airfloat equipment 20, because black
The temperature of liquid is higher, and the flocculation aid added in efficient shallow ion airfloat equipment 20 can not play Coagulation aiding, can be serious
Flocculation reaction is influenced, and then therefore black liquor is being delivered to efficient shallow ion air supporting by the removal effect for influencing solid suspension
Before equipment 20, cooling processing need to be carried out to black liquor so that flocculation aid is preferably played.
Flotation tank 23 is connected to microbubble manufacturing device 21, pool inlet tube road 22, for receiving black liquor and microbubble so that
Reacted in black liquor the floc sedimentation of generation microbubble suction-operated low suspension black liquor liquid level.
It is appreciated that before entering flotation tank 23, flocculation aid is added in black liquor, black liquor is enabled to convey
Cheng Zhong fully reacts with flocculation aid generation and generates floc sedimentation, into after flotation tank 23, because of the suction-operated of microbubble, floc sedimentation with
The liquid level that microbubble is suspended into black liquor, subsequent collection is convenient for.
Water-distributing device (not shown) is arranged in the bottom of flotation tank 23, and the disturbance for black liquor to be entered to flotation tank 23 is down to
It is minimum.It is appreciated that the movement speed of water distributor is identical as speed of the black liquor in pool inlet tube road 22, thus direction is on the contrary, produce
It has given birth to " zero velocity ", the disturbance that black liquor is entered to flotation tank 23 minimizes so that the floc sedimentation static vertical in black liquor floats
To the liquid level of black liquor.
Skim dross removal of the mud device 25 for liquid level will to be suspended in.
Scum collector 26 is transferred to concentration basin 50 for that will skim the dross that mud device 25 strikes off from black liquor, with
Convenient for being subsequently dehydrated to dross.
Efficient shallow ion airfloat equipment 20 is identical as the structure of efficient shallow ion airfloat equipment in the prior art,
Details are not described herein for included other devices.
It is different from the prior art, the processing system 100 for the black liquid that embodiment of the present invention provides, including：First effect
Tank 10, second imitates tank 30 and efficient shallow ion airfloat equipment 20, and efficient shallow ion airfloat equipment 20 is imitated with first respectively
Tank 10, second is imitated tank 30 and is connected to；Wherein, the first effect tank 10 is vacuum state, for receiving black liquor and being carried out at cooling to black liquor
Reason；Efficient shallow ion airfloat equipment 20 is used to receive the black liquor after cooling, and carries out purified treatment to black liquor, to remove black liquor
In solid suspension, form the first thin phenol water and dross；Second effect tank 30 is used to receive the first thin phenol water of first part, and
Concentration is evaporated to the first thin phenol water of reception.By the way that black liquor caused by reducing rules is delivered to the first effect tank 10
In, because the first effect tank 10 is vacuum state, quickly the temperature of black liquor can be fallen, it is then that the black liquor conveying after cooling is supreme
Shallow-layer ion airfloat equipment 20 is imitated, it, can will be big in black liquor after efficient shallow ion airfloat equipment 20 is to purifying black liquor processing
Fraction solids suspended matter removes, in this way, the first thin phenol water, which is delivered to the second effect tank 30, again is evaporated concentration, because first dilute black
The content of solid suspension in liquid is much smaller than solid suspension content contained in black liquor, it is possible to prevente effectively from appearing in evaporation
Solid, which suspends, during concentration will imitate the case where tank blocks, and so as to increase the cycle of operation duration of vapo(u)rization system, reduce
Operating cost.
Fig. 2 is please referred to, Fig. 2 is the step flow diagram of the processing method of the black liquid in present embodiment.
The processing method for the black liquid that embodiment of the present invention provides, includes the following steps：
Step S101 carries out cooling processing to black liquor.
Wherein, black liquor is generated from reducing rules, includes solid suspension, PCD and COD in black liquor, wherein Gu
The content range of body suspended matter is 1000-2000ppm, and the content of PCD is greater than or equal to 20000ppm, the content of COD be more than or
Equal to 10000ppm.The temperature of thin phenol water at this time is greater than or equal to 80 DEG C.
In present embodiment, the temperature range of the black liquor after cooling is 47-50 DEG C, such as 47 DEG C, 48.5 DEG C or 50 DEG C
Deng.
It is appreciated that the device for carrying out cooling processing to black liquor can be the first effect tank of vacuum state, when being more than or wait
After 80 DEG C of black liquor enter the first effect tank, violent boiling can occur for thin phenol water, so that the temperature of thin phenol water is direct
Near 45-50 DEG C.Certainly, in other embodiments, it can be other devices to carry out the device of cooling processing to black liquor,
This is not construed as limiting.
It is appreciated that the temperature of black liquor caused by reducing rules will be generally greater than or equal to 80 DEG C, due to black liquor temperature too
Height, in subsequent step, flocculation aid can not play Coagulation aiding, therefore, it is necessary to carry out cooling processing to black liquor, so that solid is outstanding
Float occurs flocculation reaction and forms floc sedimentation, and then floc sedimentation is removed under the action of flocculation aid.
Step S102 carries out purified treatment to the black liquor after cooling, to remove the solid suspension in black liquor, forms first
Thin phenol water and dross.
In present embodiment, the device that purified treatment is carried out to the black liquor after cooling can be with efficient shallow ion-gas float
It is standby.Certainly, in other embodiments, the device of purified treatment can be other devices, be not limited thereto.
Step S103 is evaporated concentration to first thin phenol water of a portion.
It is appreciated that before being evaporated concentration, the most solid suspension in black liquor is removed,
That is the content of the solid suspension contained in the first thin phenol water is well below contained by generated black liquor in reducing rules
Solid suspension content, in this way, it is possible to prevente effectively from appear in evaporation and concentration during solid suspend will effect tank block
The case where, so as to increase the cycle of operation duration of vapo(u)rization system, reduce operating cost.
In another embodiment, after step S103, further comprise:
Step S104, is carried out dehydrating dross, forms solids and the second thin phenol water.
In present embodiment, to further strengthen dehydrating effect, in dehydration process, flocculation aid is added, wherein help
Solidifying agent can be polyacrylamide, and further, flocculation aid is anionic polyacrylamide.The content of the flocculation aid added is
20-50ppm, such as 20ppm, 35ppm or 50ppm.Certainly, in other embodiments, flocculation aid can also select others
Material and content range, are not limited thereto.
In present embodiment, the device of dehydration can be mechanical spiral squeezing dewatering machine, certainly, in other embodiment party
In formula, dehydration device can be other equipment, be not limited thereto.
Fig. 3 is please referred to, Fig. 3 is the sub-step flow signal of step S102 in steps flow chart schematic diagram shown in Fig. 2
Figure.In one embodiment, carrying out purified treatment to the black liquor after cooling includes：
Sub-step S1021, manufacture carry the microbubble of charge；
Sub-step S1022, the flocculation aid for conveying the black liquor after cooling and being added so that effect of the black liquor in flocculation aid
Lower generation flocculation reaction forms floc sedimentation；
Sub-step S1023 receives black liquor and microbubble so that the floc sedimentation that generation is reacted in black liquor is made in the absorption of microbubble
With low suspension black liquor liquid level.
In present embodiment, flocculation aid is polyacrylamide, and further, flocculation aid is cationic polyacrylamide.Institute
The content of the flocculation aid of addition is 10-60ppm, such as 10ppm, 30ppm or 60ppm.Certainly, in other embodiments, help
Solidifying agent can also select other materials and content range, be not limited thereto.
It is appreciated that first thin phenol water of another part is conveyed for conveying microbubble, and maintain efficient shallow ion-gas
The balance of floating apparatus.
It is appreciated that when carrying out purified treatment using efficient shallow ion air supporting pool equipment, in efficient shallow ion air supporting
Flocculation aid is added in pool inlet tube road in equipment so that it is anti-that flocculation occurs under the action of flocculation aid for the solid suspension in black liquor
It answers, forms floc sedimentation, into after flotation tank, in microbubble manufacturing device under the action of generated microbubble, floc sedimentation is suspended in
The surface of black liquor then skims mud device and strikes off the floc sedimentation of suspension, to form the first thin phenol water and dross.
It is different from the prior art, the processing method for the black liquid that embodiment of the present invention provides, including：Black liquor is carried out
Cooling is handled；Purified treatment is carried out to the black liquor after cooling, to remove the solid suspension in black liquor, formed the first thin phenol water and
Dross；Concentration is evaporated to the first thin phenol water of first part.By cooling down to black liquor caused by reducing rules
Processing can remove most of solid suspension in black liquor, such as after then carrying out purified treatment to the black liquor after cooling
This, then concentration is evaporated to the first thin phenol water, because the content of the solid suspension in the first thin phenol water is much smaller than black liquor
Contained in solid suspension content, it is possible to prevente effectively from appear in be concentrated by evaporation during solid suspend will imitate tank block
Situation reduces operating cost so as to increase the cycle of operation duration of vapo(u)rization system.
1 pair of the invention illustrates with reference to embodiments.
Embodiment 1
The technological parameter of one efficient shallow ion airfloat equipment of table
As can be seen from Table I, the content of the solid suspension in flotation tank exit is well below flotation tank inlet
The content of solid suspension, that is, black liquor can remove major part after the purified treatment of efficient shallow ion airfloat equipment
Solid suspension, meanwhile, the content of PCD also largely reduces.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of processing system of black liquid, which is characterized in that including：First effect tank, second effect tank and efficient shallow from
Sub- airfloat equipment, the efficient shallow ion airfloat equipment are connected to the first effect tank, the second effect tank respectively；
Wherein, the first effect tank is vacuum state, for receiving black liquor and carrying out cooling processing to the black liquor；
The efficient shallow ion airfloat equipment is used to receive the black liquor after cooling, and is carried out at purification to the black liquor
Reason forms the first thin phenol water and dross to remove the solid suspension in the black liquor；
The second effect tank is used to receive first thin phenol water of a portion, and to first thin phenol water of reception into
The processing of row evaporation and concentration.
2. processing system according to claim 1, which is characterized in that it is described first effect tank vacuum ranges be (-
0.90) temperature range of-(- 0.93) bar, the black liquor after cooling are 47-50 DEG C.
3. processing system according to claim 1, which is characterized in that the content range of the solid suspension in the black liquor
For 1000-2000ppm, the content range of the solid suspension in first thin phenol water is 150-300ppm.
4. processing system according to claim 1, which is characterized in that the system further comprises：
Dehydration device is carried out dehydrating for receiving the dross, and to the dross, forms solids and second dilute black
Liquid.
5. processing system according to claim 1, which is characterized in that the efficient shallow ion airfloat equipment includes：
Microbubble manufacturing device, for manufacturing the microbubble for carrying charge；
Pool inlet tube road, the flocculation aid for conveying the black liquor after cooling down and being added so that the black liquor is helped described
Flocculation reaction occurs under the action of solidifying agent, forms floc sedimentation；
Flotation tank is connected to the microbubble manufacturing device, the pool inlet tube road, for receiving the black liquor and micro- gas
Bubble so that reacted in the black liquor floc sedimentation of generation the microbubble suction-operated low suspension the black liquor liquid
Face.
6. a kind of processing method of black liquid, which is characterized in that including：
Cooling processing is carried out to black liquor；
Purified treatment is carried out to the black liquor after cooling, to remove the solid suspension in the black liquor, it is dilute black to form first
Liquid and dross；
Concentration is evaporated to first thin phenol water of a portion.
7. processing method according to claim 6, which is characterized in that after carrying out cooling processing to black liquor, the black liquor
Temperature range is 47-50 DEG C.
8. processing method according to claim 6, which is characterized in that the content range of the solid suspension in the black liquor
For 1000-2000ppm, the content range of the solid suspension in first thin phenol water is 150-300ppm.
9. processing method according to claim 6, which is characterized in that the processing method further comprises：
The dross is carried out dehydrating, solids and the second thin phenol water are formed.
10. processing method according to claim 6, which is characterized in that the purified treatment includes：
Manufacture carries the microbubble of charge；
The flocculation aid for conveying the black liquor after cooling and being added so that the black liquor is sent out under the action of the flocculation aid
Raw flocculation reaction, forms floc sedimentation；
Receive the black liquor and the microbubble so that suction of the floc sedimentation in the microbubble of generation is reacted in the black liquor
Liquid level of the attached effect low suspension in the black liquor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112941949A (en) * | 2021-03-06 | 2021-06-11 | 山东科迈生物制浆有限公司 | Pulping black liquor pretreatment process |
| CN112986051A (en) * | 2019-12-12 | 2021-06-18 | 广西金桂浆纸业有限公司 | Detection device for detecting pulping and papermaking system and pulping and papermaking system |
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