CN102392381B - Chemi-mechanical pulp waste liquid alkaline recycling pretreatment method - Google Patents
Chemi-mechanical pulp waste liquid alkaline recycling pretreatment method Download PDFInfo
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Abstract
The invention discloses a chemi-mechanical pulp waste liquid alkaline recycling pretreatment method. The method comprises the following steps of: first, collectinga waste liquid in the chemi-mechanical pulp producing process into a waste liquid middle pool, wherein the middle pool is a square cement pool or a circular steel groove; placing the middle pool beside an extruder; and then feeding the waste liquid of the middle pool into a filtering device to be filtered; feeding the filtered waste slag into a slag screening pool; feeding a filter liquor into an alkaline recycling treatment procedure, wherein filtering device is a pressure screen, a fine grid or a conical slag separator; feeding the waste slag into a fluid exhaustion device to carry out fluid exhaustion; controlling the mass ofthe removed slag to be 70-90% of the total mass of the screen slag; and collecting the waste water after fluid exhaustion and feeding the waste water into the waste liquid middle pool, wherein the fluid exhaustion device is a filtering type centrifugal concentrator, a sedimentation type centrifugal concentrator or a spiral press master. According to the invention, the waste liquid is pre-treated before the alkaline is recycled so that the follow-up alkaline recycling efficiency is enhanced and greater environment friendliness is obtained.
Description
Technical field
The present invention relates to slurrying field machine pulp waste alkali and reclaim, particularly relate to a kind ofization machine pulp waste alkali and reclaim preprocess method.
Background technology
Change machine slurry can effectively utilize fibrous raw material as a kind of high yield cooking method, and ton slurry consumption of raw materials and water consumption are all lacked than chemical pulp.Because water consumption is less, the content of inorganic matters such as carbohydrate, lignin, extract and alkali is all than higher in the waste water.Undressed waste water has very strong toxicity to the microorganism in the water body, has influenced the biological treatment of waste water.For environmental protection and be company saving 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 has been handled to reach environmental protection requirement to discharge, in addition, alkali reclaims and also to make waste recycling, for economic benefit has improved in enterprise.
Chinese invention patent 200810019354.5 discloses a kind of zero discharge treatment method for chemical mechanical pulp, may further comprise the steps: at first will change the machine pulp waste and adopt film to separate pre-concentration, see through liquid A complete-reclaiming in slurrying and alkali recycle section, filter liquor A sends into the multiple-effect evaporation station; Filter liquor A obtains evaporated liquor B and concentrate B behind pervaporation, evaporated liquor B continues stripping to be handled, and complete-reclaiming is in slurrying and causticization washing room, and concentrate B then carries out traditional alkali recycling.This method reduces operating cost to when changing machine pulp waste employing alkali recovery process realization zero-emission, reduces disposable apparatus investment and recycle-water resource.But this method filter liquor A evaporates, stripping is handled, and energy consumption is big.
Mainly 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 owing to mixed many bits in the waste liquid, has influenced the efficient that follow-up alkali reclaims on the one hand; On the other hand, in the production of change machine slurry, many bits in effluent discharge, have also been produced, still residual waste liquid necessarily in these bits, and also be rich in alkali in the residual waste liquid, not only still can pollute environment if directly discharge, and cause the waste of alkali.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of alkali recovery efficiency height, environmentally friendlyization machine pulp waste alkali to reclaim preprocess method.
Technical solution of the present invention is:
A kind ofization machine pulp waste alkali reclaims preprocess method, may further comprise the steps:
(1) waste liquid in the collectionization machine slurry production process is to the middle pond of waste liquid; Middle pond is square cement pit or circular steel tank, is placed on the extruder next door;
(2) waste liquid in pond in the middle of described is sent into filter and filter, the waste residue after the filtration is sent into the screening reject pond, and filtrate is sent into alkali recycling operation; Described filter is pressurized screen, fine fack or hydrocyclone;
(3) described waste residue is sent into dewatering device and taken off the liquid processing, the bits quality that control is deviate from accounts for the 70-90% of screening reject gross mass, and the middle pond of waste liquid is sent in the wastewater collection of taking off after liquid is handled; Described dewatering device is filtering type centrifugal concentrator, decanter type centrifugal concentrator or acroll press washer.
Further, the waste liquid in the describedization machine slurry production process comprises the waste liquid that screw extrusion fluffer workshop section and screw press workshop section produce.
The waste liquid that the pre-preg workshop section of described being included in of waste liquid machine slurry production preliminary processes or the bolting house of subsequent technique produce.
Described screening reject pond is placed on the filter next door.
The waste residue that takes off behind the liquid is discharged, as the raw material of producd fibers plate or the back of regrinding as the sandwich layer slurry of boxboard or get back to systemic circulation and use.
Waste liquid recovery process of the present invention comprises the waste liquid that screw extrusion fluffer workshop section and screw press workshop section produce with the filtered water in the change machine slurry production process, the unified middle pond of waste liquid that is collected into; Then the waste liquid in middle pond is filtered, waste liquid after the filtration send the alkali recovery process, and the bits of generation are collected in the screening reject pond, and takes off liquid with dewatering device and handle, wastewater collection after taking off liquid and handling enters pond in the middle of the waste liquid, and coal combustion is discharged, mixed to the bits that take off behind the liquid; The waste liquid of property performance period reclaims and purified treatment thus.
With respect to prior art, the present invention has following advantage and beneficial effect:
(1) the present invention carries out bits that alkali discharges at first to change machine slurry production process before reclaiming and takes off liquid and handle changing the machine pulp waste, take off waste liquid that liquid discharges and enter pond in the middle of the waste liquid, has reduced bits to the pollution of environment and has improved alkali recovery;
(2) waste liquid in the pond in the middle of the waste liquid has been improved the purity of waste liquid by purified treatment, will be mingled in that bits filter out in the waste liquid, thereby adopted method of the present invention to carry out alkali at waste liquid and carry out preliminary treatment before reclaiming and improved the efficient that follow-up alkali reclaims;
(3) bits that produce in the change machine slurry production process have been handled also environmental protection more through taking off liquid.Thereby the present invention earlier has alkali recovery efficiency height, the advantage of environmental protection more than alkali recovery processing technique before.
Description of drawings
Fig. 1 reclaims the flow chart of preprocess method for of the present inventionization machine slurry alkali.
The specific embodiment
For further understanding the present invention, below in conjunction with drawings and Examples invention machine slurry alkali is reclaimed preprocess method and elaborate, but the scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in Figure 1, of the present inventionization machine slurry alkali reclaims preprocess method: change the machine pulp waste and be introduced into the middle pond of waste liquid, middle pond is square cement pit or circular steel tank, is placed on the extruder next door.Change machine pulp waste pumping then in the pond enters filter, and filter is generally fine fack, pressurized screen or hydrocyclone and carries out filtration treatment, and the waste residue after the filtration flows into the screening reject pond, and filtrate is sent into the prevapourising workshop section that alkali reclaims; The screening reject pond is placed on the filter next door, with pump screening reject is sent into dewatering device then and take off the liquid processing, the waste residue that takes off behind the liquid is discharged,, take off the liquid that obtains behind the liquid and collect and send into pond in the middle of the waste liquid as the sandwich layer slurry of boxboard or get back to systemic circulation and use as the raw material of producd fibers plate or the back of regrinding.Dewatering device can be filtering type centrifugal concentrator, decanter type centrifugal concentrator or acroll press washer.
Embodiment 1
A kind of APMPization machine pulp waste alkali reclaims preprocess method, may further comprise the steps:
(1) waste liquid of collecting wood chip extruder generation in the APMP production process is to the middle pond of waste liquid, and middle pond is square cement pit, is placed on the extruder next door.
(2) waste liquid with middle pond filters with being pumped to fine fack, and waste residue after the filtration flows into the screening reject pond, and the screening reject pond is square cement pit, be placed on fine fack below, filtrate is sent into the prevapourising workshop section that alkali reclaims.
(3) with pump the screening reject in the screening reject pond is sent into the filtering type centrifugal concentrator and take off the liquid processing, the bits quality that control is deviate from accounts for 70% of screening reject gross mass, and the waste water that takes off after liquid is handled is got back to the middle pond of waste liquid; Sandwich layer as boxboard after the bits of deviating from are regrinded is starched.
By this processing method, further reclaimed the waste water and the salkali waste that contain in the screening reject, the screening reject mass dryness fraction is increased to 20%, than prior art, can reduce discharge of wastewater 3-5m
3/ ton slurry.
Embodiment 2
A kind of PRC-APMPization machine pulp waste alkali reclaims preprocess method, may further comprise the steps:
(1) waste liquid that screw extrusion fluffer workshop section and screw press workshop section produce in the collection PRC-APMP production process is collected the waste liquid of follow-up bolting house generation to the middle pond of waste liquid simultaneously to the middle pond of waste liquid.Middle pond is circular steel tank, is placed on the below of the many disk filters of screw press workshop section.
(2) waste liquid with middle pond filters with being pumped to the F20 pressurized screen, and the waste residue after the filtration flows into the screening reject pond, and the screening reject pond is circular steel tank, is placed on the next door of pressurized screen, and filtrate is sent into the prevapourising workshop section that alkali reclaims;
(3) waste residue is sent into the decanter type centrifugal concentrator and taken off the liquid processing, the bits quality of deviating from accounts for 85% of screening reject gross mass, and the middle pond of waste liquid is sent in the wastewater collection of taking off after liquid is handled; Bits after taking off liquid and handling are used for the raw material as the producd fibers plate.
By this processing method, further reclaimed the waste water and the salkali waste that contain in the screening reject, the screening reject mass dryness fraction is increased to 25%, and wastewater discharge has only 2-3m
3/ ton slurry; Simultaneously, reduced the suspension content in the waste liquid that send evaporation, helped to improve alkali and reclaim evaporation efficiency.
Embodiment 3
A kind of CTMPization machine pulp waste alkali reclaims preprocess method, may further comprise the steps:
(1) floods the waste liquid of workshop section, bolting house and concentration section generation in the collection CTMP production process to the middle pond of waste liquid, the square cement tub in middle pond;
(2) waste drains pump in middle pond is delivered to pressurized screen and hydrocyclone carries out twice filtration, filtrate filtered is sent into alkali and is reclaimed evaporation section;
(3) waste residue is sent into acroll press washer and taken off the liquid processing, the waste water that takes off after liquid is handled is got back to the middle pond of waste liquid; The bits quality of deviating from accounts for 90% of screening reject gross mass, and the bits after taking off liquid and handling enter stock tank recirculation and use after fiberizer is regrinded.
By this processing method, further reclaimed the waste water and the salkali waste that contain in the screening reject, screening reject is recycled, and compared with prior art, has improved paper pulp yield 1-2 percentage point.
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 bits dewatering device also can adopt other forms of dewatering device for another example.Present technique also is applicable to RMP, and other changes the processing of machine pulp waste TMP, BCTMP etc.At this, should illustrate that any change of making all will fall within the scope of protection of the present invention under inventive concept of the present invention.
Claims (4)
1. a change machine pulp waste alkali reclaims preprocess method, it is characterized in that may further comprise the steps:
(1) waste liquid in the collectionization machine slurry production process is to the middle pond of waste liquid; Middle pond is square cement pit or circular steel tank, is placed on the extruder next door;
(2) waste liquid in pond in the middle of described is sent into filter and filter, the waste residue after the filtration is sent into the screening reject pond, and filtrate is sent into alkali recycling operation; Described filter is pressurized screen, fine fack or hydrocyclone;
(3) described waste residue is sent into dewatering device and taken off the liquid processing, the bits quality that control is deviate from accounts for the 70-90% of screening reject gross mass, and the middle pond of waste liquid is sent in the wastewater collection of taking off after liquid is handled; Described dewatering device is filtering type centrifugal concentrator, decanter type centrifugal concentrator or acroll press washer; The waste residue that takes off behind the liquid is discharged, as the raw material of producd fibers plate or the back of regrinding as the sandwich layer slurry of boxboard or get back to systemic circulation and use.
2. according to claim 1ization machine pulp waste alkali reclaims preprocess method, it is characterized in that: the waste liquid in the describedization machine slurry production process comprises the waste liquid that screw extrusion fluffer workshop section and screw press workshop section produce.
3.3 according to claim 1ization machine pulp waste alkali reclaims preprocess method, it is characterized in that: the waste liquid that the pre-preg workshop section of described being included in of waste liquid machine slurry production preliminary processes or the bolting house of subsequent technique produce.
4.4 according to claim 1ization machine pulp waste alkali reclaims preprocess method, it is characterized in that: described screening reject pond is placed on the filter next door.
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| CN105821696B (en) * | 2016-06-12 | 2017-12-01 | 中国轻工业成都设计工程有限公司 | Application of the centrifuge on papermaking pulping system |
| CN114053768B (en) * | 2021-11-24 | 2022-12-20 | 中冶京诚工程技术有限公司 | Method for preventing hardening of filter material of blast furnace water slag bottom filtering system |
| CN115434178B (en) * | 2022-08-23 | 2023-09-01 | 天津科技大学 | Chemical alkali recovery treatment process for chemical mechanical pulp waste liquid |
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| WO2002090647A1 (en) * | 2001-05-09 | 2002-11-14 | V & K Consulting Avoin Yhtiö | Method and apparatus for recovering fibre and fibre-based solids from filtrates containing both solids and liposoluble extractive agents of mechanical or chemi-mechanical pulp industry |
| US20060149015A1 (en) * | 2005-01-05 | 2006-07-06 | Katrina Cornish | Biopolymer extraction from plant materials |
| 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 |
| CN101285277A (en) * | 2008-04-30 | 2008-10-15 | 宜宾长毅浆粕有限责任公司 | Hyperfiltration process of pulping and digesting black liquor |
| CN102092804A (en) * | 2009-12-11 | 2011-06-15 | 山东太阳纸业股份有限公司 | Zero-emission treatment method for wastewater of chemi-mechanical pulp |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002090647A1 (en) * | 2001-05-09 | 2002-11-14 | V & K Consulting Avoin Yhtiö | Method and apparatus for recovering fibre and fibre-based solids from filtrates containing both solids and liposoluble extractive agents of mechanical or chemi-mechanical pulp industry |
| US20060149015A1 (en) * | 2005-01-05 | 2006-07-06 | Katrina Cornish | Biopolymer extraction from plant materials |
| 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 |
| CN101285277A (en) * | 2008-04-30 | 2008-10-15 | 宜宾长毅浆粕有限责任公司 | Hyperfiltration process of pulping and digesting black liquor |
| CN102092804A (en) * | 2009-12-11 | 2011-06-15 | 山东太阳纸业股份有限公司 | Zero-emission treatment method for wastewater of chemi-mechanical pulp |
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