CN102230293A - Evaporation pretreatment process method for alkaline peroxide mechanical pulp - Google Patents
Evaporation pretreatment process method for alkaline peroxide mechanical pulp Download PDFInfo
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- CN102230293A CN102230293A CN2011101474868A CN201110147486A CN102230293A CN 102230293 A CN102230293 A CN 102230293A CN 2011101474868 A CN2011101474868 A CN 2011101474868A CN 201110147486 A CN201110147486 A CN 201110147486A CN 102230293 A CN102230293 A CN 102230293A
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Abstract
The invention provides an evaporation pretreatment process method for alkaline peroxide mechanical pulp, which comprises a waste liquor recovery process and an alkali recovery process, wherein in the waste liquor recovery process, filter water in the production process of the alkaline peroxide mechanical pulp is collected to a waste liquor intermediate pond, and in the alkali recovery process, collected waste liquor in the waste liquor intermediate pond is subjected to alkali recovery treatment. Before the alkali recovery treatment, the method also comprises the following evaporation pretreatment steps of: (a) performing pressure filtering on waste liquor, namely filtering the waste liquor in the waste liquor intermediate pond by a pressure sieve, discharging dregs formed during filtering to a dreg sieving pond, and discharging the filtered waste liquor to a waste liquor tower to enter the step (b); and (b) performing evaporation grading treatment on the filtered waste liquor by an evaporator, wherein heavily-polluted concentrated solution is discharged to a concentrated solution pond for alkali recovery treatment, mildly-polluted concentrated solution is discharged to a wood chip washing water tank to clean wood chips, and after being mixed with disk mill dilution water in a white water tower, white water generated during evaporation is discharged to a hot white water tank and enters a pulping system of the alkaline peroxide mechanical pulp. The evaporation pretreatment process method has the advantages of high alkali recovery efficiency and environment friendliness.
Description
Technical field
The present invention relates to the slurrying field, the liquid waste processing in relating in particular to machine slurry field is meant that specifically a kind ofization machine slurry alkali reclaims the evaporation pretreatment process method.
Background technology
Because APMP(Alkaline Peroxide Mechanical Pulp in the change machine slurry production process) workshop can produce a large amount of waste water, waste residue, waste gas, for environmental protection reaches is that company saves cost, so a series of workshop section that serves slurrying such as alkali recovery etc. has been arranged a lot, on the one hand waste water is handled to reach environmental protection requirement and discharged, in addition, alkali reclaims and also to make waste recycling, for economic benefit has improved in enterprise.
Be that the waste liquid that will collect directly enters alkali recycling operation at change machine slurry alkali recovery processing technique at present, this method is on the one hand owing to impurity in the waste liquid is more, many bits have been mixed, and most compositions are water in the waste liquid, and in change machine slurry pulping system, the consumption of water is very big, and the water in the waste liquid has also been caused great waste as not being used, and the efficient of recovery alkali is also lower in the waste liquid that concentration is lower directly.
Summary of the invention
The technical problem to be solved in the present invention is to provide the change machine slurry alkali of a kind of alkali recovery efficiency height, environmental protection more to reclaim the evaporation pretreatment process method.
Technical solution of the present invention is, provide following a kind ofization machine slurry alkali to reclaim the evaporation pretreatment process method, comprise waste liquid recovery process and alkali recovery process, the waste liquid recovery process is with the pond to the waste liquid of the filtered water collection in the change machine slurry production process, the alkali recovery process carries out the alkali recycling with the waste liquid in the pond in the middle of the waste liquid of collecting, and also comprises following evaporation pre-treatment step before the described alkali recycling:
(a) waste liquid pressure filtration filters the waste liquid in the pond in the middle of the waste liquid by pressurized screen, filter the bits that produce and enter the screening reject pond, and the waste liquid after the filtration enters the waste liquid tower and enters step (b);
(b) waste liquid after the filtration evaporates hierarchical processing by evaporimeter, the dirty concentrate of weight wherein enters and concentrates liquid pool and go forward side by side and recycle into alkali, light dirt then enters wood chip washing tank and is used for cleaning wood chip, and the plain boiled water that evaporation produces enters hot entering of back flow water pump circulation machine slurry pulping system after entering plain boiled water tower and the mixing of mill dilution water.
After adopting above scheme, the present invention carries out at first the waste liquid in the pond in the middle of the waste liquid being carried out the purity that pressure filtration has improved waste liquid by pressurized screen before the alkali recovery at change machine pulp waste, to be mingled in that bits filter out in the waste liquid, and the waste water utilization evaporimeter after filtering evaporated hierarchical processing, the dirty concentrate of weight wherein enters the alkali recycling, light dirt then enters wood chip washing tank and is used for cleaning wood chip, and the plain boiled water that evaporation produces enters hot entering of back flow water pump circulation machine slurry pulping system after entering plain boiled water tower and the mixing of mill dilution water, improved the utilization ratio of water, environmental protection more, in addition the dirty concentrate of the weight after the evaporation process is carried out alkali and reclaim the organic efficiency height.Thereby the present invention earlier has alkali recovery efficiency height, the advantage of environmental protection more than alkali recovery processing technique before.
As improvement, comprise that also waste residue collects and take off the liquid flow process, adopt dewatering device will be collected in the screening reject pond bits and take off liquid and handle, take off wastewater collection after liquid is handled and enter pond in the middle of the waste liquid, the bits that take off behind the liquid are discharged otherwise processed.Adopt this preferred version to reduce bits to the pollution of environment and improved alkali recovery.
As preferably, the waste liquid that comprises that screw extrusion fluffer workshop section and screw press workshop section produce is collected in the pond in the middle of the described waste liquid.
As improvement, the waste liquid that described screw press workshop section produces enters the turbid reservoir of squeezing and utilizes decker to concentrate and reclaim the fiber that squeezes in the turbid reservoir, reentering of the part fiber machine slurry pulping system that reclaims, the waste liquid of generation enters the middle pond of waste liquid.This improvement project has improved the fiber utilization rate in the waste liquid that screw press workshop section produces and has improved follow-up alkali recovery efficiency.
As preferably, described dewatering device is meant centrifuge.Adopt centrifuge that bits are taken off liquid and handle, it is thorough to take off liquid, the efficient height.
As preferably, described centrifuge is meant countercurrent centrifuge.
Description of drawings
It in the accompanying drawing flow chart of steps that embodiment of the invention machine slurry alkali reclaims the evaporation pretreatment process method.
Shown in the figure:
1, screw extrusion fluffer workshop section, 2, screw press workshop section.
The specific embodiment
For ease of explanation,, invention machine slurry alkali is reclaimed the evaporation pretreatment process method elaborates below in conjunction with accompanying drawing:
As shown in the drawing, a kind ofization machine slurry alkali reclaims the evaporation pretreatment process method, comprise waste liquid recovery process and alkali recovery process, the waste liquid recovery process is with the pond to the waste liquid of the filtered water collection in the change machine slurry production process, the alkali recovery process carries out the alkali recycling with the waste liquid in the pond in the middle of the waste liquid of collecting, and also comprises following evaporation pre-treatment step before the described alkali recycling:
(a) waste liquid pressure filtration filters the waste liquid in the pond in the middle of the waste liquid by pressurized screen, filter the bits that produce and enter the screening reject pond, and the waste liquid after the filtration enters the waste liquid tower and enters step (b);
(b) waste liquid after the filtration evaporates hierarchical processing by evaporimeter, the dirty concentrate of weight wherein enters and concentrates liquid pool and go forward side by side and recycle into alkali, light dirt then enters wood chip washing tank and is used for cleaning wood chip, and the plain boiled water that evaporation produces enters hot entering of back flow water pump circulation machine slurry pulping system after entering plain boiled water tower and the mixing of mill dilution water.
Also comprise the waste residue collection in the present embodiment and take off the liquid flow process, adopting dewatering device will be collected in the screening reject pond bits takes off liquid and handles, wastewater collection after taking off liquid and handling enters pond in the middle of the waste liquid, and the bits that take off behind the liquid are discharged otherwise processed, and described dewatering device is meant countercurrent centrifuge; The waste liquid that comprises that screw extrusion fluffer workshop section 1 and screw press workshop section 2 produce is collected in the pond in the middle of the described waste liquid; The waste liquid that described screw press workshop section produces enters the turbid reservoir of squeezing and utilizes decker to concentrate the fiber that reclaims in the turbid reservoir of squeezing, reentering of the part fiber machine slurry pulping system of recovery, and the waste liquid of generation enters the middle pond of waste liquid.
In the above-described embodiments, preferred forms of the present invention is described, obviously, under inventive concept of the present invention, still can make a lot of variations, also can starch production technology or waste liquid preposition or that subsequent treatment produces by being included in machine as the waste liquid that collect in pond in the middle of the waste liquid, described for another example bits dewatering device also can adopt other forms of centrifuge or dewatering device.At this, should illustrate that any change of being made all will fall within the scope of protection of the present invention under inventive concept of the present invention.
Claims (6)
1. a change machine slurry alkali reclaims the evaporation pretreatment process method, comprise waste liquid recovery process and alkali recovery process, the waste liquid recovery process is with the pond to the waste liquid of the filtered water collection in the change machine slurry production process, the alkali recovery process carries out the alkali recycling with the waste liquid in the pond in the middle of the waste liquid of collecting, and it is characterized in that: also comprise following evaporation pre-treatment step before the described alkali recycling:
(a) waste liquid pressure filtration filters the waste liquid in the pond in the middle of the waste liquid by pressurized screen, filter the bits that produce and enter the screening reject pond, and the waste liquid after the filtration enters the waste liquid tower and enters step (b);
(b) waste liquid after the filtration evaporates hierarchical processing by evaporimeter, the dirty concentrate of weight wherein enters and concentrates liquid pool and go forward side by side and recycle into alkali, light dirt then enters wood chip washing tank and is used for cleaning wood chip, and the plain boiled water that evaporation produces enters hot entering of back flow water pump circulation machine slurry pulping system after entering plain boiled water tower and the mixing of mill dilution water.
2. according to claim 1ization machine slurry alkali reclaims the evaporation pretreatment process method, it is characterized in that: also comprise the waste residue collection and take off the liquid flow process, adopting dewatering device will be collected in the screening reject pond bits takes off liquid and handles, wastewater collection after taking off liquid and handling enters pond in the middle of the waste liquid, and the bits that take off behind the liquid are discharged otherwise processed.
3. according to claim 1ization machine slurry alkali reclaims the evaporation pretreatment process method, it is characterized in that: the waste liquid that comprises that screw extrusion fluffer workshop section (1) and screw press workshop section (2) produce is collected in the pond in the middle of the described waste liquid.
4. according to claim 3ization machine slurry alkali reclaims the evaporation pretreatment process method, it is characterized in that: the waste liquid that described screw press workshop section (2) produces enters the turbid reservoir of squeezing and utilizes decker to concentrate the fiber that reclaims in the turbid reservoir of squeezing, reentering of the part fiber machine slurry pulping system that reclaims, the waste liquid of generation enters the middle pond of waste liquid.
5. according to claim 2ization machine slurry alkali reclaims the evaporation pretreatment process method, and it is characterized in that: described dewatering device is meant centrifuge.
6. according to claim 5ization machine slurry alkali reclaims the evaporation pretreatment process method, and it is characterized in that: described centrifuge is meant countercurrent centrifuge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101474868A CN102230293A (en) | 2011-06-02 | 2011-06-02 | Evaporation pretreatment process method for alkaline peroxide mechanical pulp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101474868A CN102230293A (en) | 2011-06-02 | 2011-06-02 | Evaporation pretreatment process method for alkaline peroxide mechanical pulp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758375A (en) * | 2012-07-31 | 2012-10-31 | 广西金桂浆纸业有限公司 | Pretreatment method of chemical-mechanical pulping effluent |
| CN104480760A (en) * | 2014-11-28 | 2015-04-01 | 李奇坤 | Processing method for wood chip for pulping to make paper and pulping method including the same |
| WO2016179846A1 (en) * | 2015-05-08 | 2016-11-17 | 白博 | Zero discharge process of pulping waste liquid of all-cotton straw chemi-mechanical pulp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215797A (en) * | 2008-01-04 | 2008-07-09 | 金东纸业（江苏）股份有限公司 | Zero discharge treatment method for chemical mechanical pulp |
| CN101585617A (en) * | 2009-05-12 | 2009-11-25 | 潍坊恒联浆纸有限公司 | A kind of process for treating chemical fiber cotton pulp black liquor |
-
2011
- 2011-06-02 CN CN2011101474868A patent/CN102230293A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215797A (en) * | 2008-01-04 | 2008-07-09 | 金东纸业（江苏）股份有限公司 | Zero discharge treatment method for chemical mechanical pulp |
| CN101585617A (en) * | 2009-05-12 | 2009-11-25 | 潍坊恒联浆纸有限公司 | A kind of process for treating chemical fiber cotton pulp black liquor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758375A (en) * | 2012-07-31 | 2012-10-31 | 广西金桂浆纸业有限公司 | Pretreatment method of chemical-mechanical pulping effluent |
| CN104480760A (en) * | 2014-11-28 | 2015-04-01 | 李奇坤 | Processing method for wood chip for pulping to make paper and pulping method including the same |
| CN104480760B (en) * | 2014-11-28 | 2017-02-22 | 李奇坤 | Processing method for wood chip for pulping to make paper and pulping method including the same |
| WO2016179846A1 (en) * | 2015-05-08 | 2016-11-17 | 白博 | Zero discharge process of pulping waste liquid of all-cotton straw chemi-mechanical pulp |
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Application publication date: 20111102 |