CN104291716A - Treatment method of green sludge in pulp plant - Google Patents
Treatment method of green sludge in pulp plant Download PDFInfo
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- CN104291716A CN104291716A CN201410477918.5A CN201410477918A CN104291716A CN 104291716 A CN104291716 A CN 104291716A CN 201410477918 A CN201410477918 A CN 201410477918A CN 104291716 A CN104291716 A CN 104291716A
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention provides a treatment method of green sludge in a pulp plant. The treatment method comprises the following steps: neutralizing green sludge in the pulp plant to obtain modified green sludge; dehydrating the modified green sludge to obtain semi-dried modified green sludge; and incinerating a fuel and the semi-dried modified green sludge to obtain green sludge incinerated slag in which the content of chlorine is 0.01%-0.05%, the content of potassium is 0.1%-04% and the content of sodium is 0.5%-1.5%. By virtue of the treatment method disclosed by the invention, the green sludge in a pulp plant is modified and incinerated and converted from an industrial refuse for landfill treatment into a recyclable multi-purpose slag which can be used as a cement raw material ingredient. In addition, the slag can be also used as a haven reclamation residue soil ingredient and road subgrade residue soil. The experimental results show that if the green sludge incinerated slag is used as the cement raw material ingredient, when the mixing amount of the green sludge incinerated slag is less than or equal to 10%, the prepared cement mixed material can meet the requirement of building material cements.
Description
Technical field
The invention belongs to industrial refuse resource utilization field, particularly relate to a kind for the treatment of process of starching factory's green mud.
Background technology
The alkali collection of kraft process is a kind of production technology measures occurring along with near, modern pulping and paper-making cause, develop, and has the history of more than 100 year so far.In alkaline process process, according to different raw materials, the alkali that total alkali content reaches 10% ~ 25% be added, these alkali are in digestion process, with the lignin in raw material, hemicellulose, cellulosic degradation product generation chemical action, and be dissolved in together in cooking liquor, form black liquor.When not having alkali collection, these black liquor are all used as waste discharge and have been fallen.People took a hint from the method for Lu's N. Blanc alkaline afterwards, and (Lv Bulan is Frenchman, and he has invented the method for first industry soda ash processed in 1788, i.e. sodium carbonate method-obtained patent in 1791.This sodium carbonate method comprises: with sea salt and sulfuric acid reaction, generate sodium sulfate, again calcine together with coal with Wingdale form soda ash), try to adopt the method for concentrated black liquor, burning, causticization, progressively develop into the technology reclaiming alkali from the waste liquid of slurrying.
Up to the present, the measure that kraft process eliminates the comparative maturity of black liquor chemical contamination only has " alkali collection ", along with modernization kraft process alkali collection industrial expansion, nearly 100% recycle and reuse of alkali recovery white slime of megaton slurry factory, but its alkali collection system is for keeping normal continuous seepage, need in continued emissions system because of raw material wood chip, mend alkali, mend Wingdale and the Non-Process Elements (NPE) introduced, thus in the scavenging process of alkali collection green liquor, create part green mud, it is 1.8g/kg ~ 2.0g/kg that described green mud comprises potassium content, chloride ion content is 3.35 × 10
3~ 3.55 × 10
3mg/kg, sodium content is 17.1g/kg ~ 19.0g/kg.
Green mud because of its contain do not wash in a large number most more than alkali, as sodium carbonate, sodium hydroxide, sodium sulphite etc., simultaneously also containing a small amount of silicon, magnesium, ferro element compound, the heavy metal such as copper, chromium, lead, zinc of trace, bring very large technical barrier to its recycling, become industrial refuse.So green mud landfill method has been manipulated so two harmful comparing and has got its light industry universal way.
Before last century the nineties, the kraft mill of European and American developed countries all adopts simple landfill disposal for alkali collection green mud in the world.Because these countries population are rare, the relative China's abundant of forest-covered area is many, in the extensive contract artificial forest that its slurry factory build paper grade (stock) woods in more or be on the verge of near the wildwood that can fell, several cities and towns of living without mass-producing population concentration within the scope of periphery tens of miles, rural area, so, for high to green mud disposal technology threshold and also can use for reference without mature technology, the considerations such as environmental impact factor is relatively low, alkali collection green mud all adopts simple landfill disposal, occupy valuable land resources like this, both the waste of resource had been caused, there is again potential environmental risk.
Summary of the invention
In view of this, the object of the present invention is to provide a kind for the treatment of process of starching factory's green mud.Preparation method provided by the invention makes slurry factory green mud can be used as cement raw material batching.
The invention provides a kind for the treatment of process of starching factory's green mud, comprise the following steps:
Slurry factory green mud is carried out neutralizing treatment, obtains modification green mud;
Described modification green mud is carried out processed, obtains semi-oriented modification green mud;
Fuel and described semi-oriented modification green mud are burned, obtain green mud dregs of incinerator, in described green mud dregs of incinerator, cl content is 0.01% ~ 0.05%; Potassium content is 0.1% ~ 0.4%; Sodium content is 0.5% ~ 1.5%.
Preferably, the mass dryness fraction of described slurry factory green mud is 35% ~ 50%.
Preferably, described neutralizing treatment to pH value is 6 ~ 9.
Preferably, in described processed, the mass dryness fraction of modification green mud is 3% ~ 5%.
Preferably, the device of described processed is sheet frame squeezing deep dehydration machine or horizontal screw centrifuge.
Preferably, the feed pressure of described sheet frame squeezing deep dehydration machine is 0.6MPa ~ 1.2MPa;
The diaphragm pressing pressure of described sheet frame squeezing deep dehydration machine is 1MPa ~ 2MPa.
Preferably, the fresh feed pump pressure of described horizontal screw centrifuge is 0.1MPa ~ 0.225MPa;
The input speed of described horizontal screw centrifuge is 15L/s ~ 20L/s.
Preferably, modification green mud carries out processed to mass dryness fraction is 40% ~ 60%.
Preferably, described fuel comprises coal, screenings and wood chip;
The mass ratio of described coal, screenings, wood chip and semi-oriented modification green mud is (220 ~ 300): (40 ~ 50): (500 ~ 600): (50 ~ 60).
Preferably, the temperature of described burning is 850 DEG C ~ 900 DEG C.
The invention provides a kind for the treatment of process of starching factory's green mud, comprise the following steps: slurry factory green mud is carried out neutralizing treatment, obtains modification green mud; Described modification green mud is carried out processed, obtains semi-oriented modification green mud; Fuel and described semi-oriented modification green mud are burned, obtain green mud dregs of incinerator, in described green mud dregs of incinerator, cl content is 0.01% ~ 0.05%; Potassium content is 0.1% ~ 0.4%; Sodium content is 0.5% ~ 1.5%.Compared with prior art, slurry factory green mud is carried out modification and burning by treatment process provided by the invention, it is changed into a kind of multi-usage slag of recycling from the industrial refuse of landfill disposal, can prepare burden as cement raw material.In addition, the green mud dregs of incinerator that treatment process provided by the invention prepares can be used as harbour and fill out extra large dregs batching, also can be used as road foundation dregs batching.Experimental result shows: green mud dregs of incinerator is prepared burden as cement raw material, and the mechanical property of the cement mixture obtained when its volume is less than or equal to 10% meets the requirement of building material cement.Treatment process provided by the invention had both saved valuable landfill yard land resources, turn eliminated the long-range circumstances risk that industrial refuse is potential.
Accompanying drawing explanation
The schematic flow sheet of the treatment process of the slurry factory green mud that Fig. 1 provides for the embodiment of the present invention.
Embodiment
The invention provides a kind for the treatment of process of starching factory's green mud, comprise the following steps:
Slurry factory green mud is carried out neutralizing treatment, obtains modification green mud;
Described modification green mud is carried out processed, obtains semi-oriented modification green mud;
Fuel and described semi-oriented modification green mud are burned, obtain modification green mud dregs of incinerator, in described green mud dregs of incinerator, cl content is 0.01% ~ 0.05%; Potassium content is 0.1% ~ 0.4%; Sodium content is 0.5% ~ 1.5%.
Compared with prior art, slurry factory green mud is carried out modification and burning by treatment process provided by the invention, it is changed into a kind of multi-usage slag of recycling from the industrial refuse of landfill disposal, can prepare burden as cement raw material.In addition, this green mud dregs of incinerator can be used as harbour and fill out extra large dregs batching, also can be used as road foundation dregs batching.Experimental result shows: green mud dregs of incinerator is prepared burden as cement raw material, and the mechanical property of the cement mixture obtained when its volume is less than or equal to 10% meets the requirement of building material cement.Treatment process provided by the invention had both saved valuable landfill yard land resources, turn eliminated the long-range circumstances risk that industrial refuse is potential.
Slurry factory green mud is carried out neutralizing treatment by the present invention, obtains modification green mud.In the present invention, the mass dryness fraction of described slurry factory green mud is preferably 35% ~ 50%, is more preferably 38% ~ 48%, most preferably is 40% ~ 45%; The component composition of described slurry factory green mud is as shown in table 1, and table 1 is the component of slurry factory green mud and contains scale:
Table 1 is starched the component of factory's green mud and is contained scale
The present invention preferably adopts the acid waste wash liquor of ClO 2 bleaching to carry out neutralizing treatment to slurry factory green mud.In the present invention, the pH value of the acid waste wash liquor of described ClO 2 bleaching is preferably 2 ~ 2.5.The source of the present invention to the acid waste wash liquor of described ClO 2 bleaching does not have special restriction, preferably adopts the acid waste wash liquor of the ClO 2 bleaching produced during kraft process.It is 6 ~ 9 that slurry factory green mud is preferably neutralized to pH value by the present invention.The present invention preferably carries out neutralizing treatment in green mud stirred tank.In the present invention, when slurry factory green mud carries out neutralizing treatment, according to alkaline size and the treatment capacity of slurry factory green mud, decide the consumption of acid waste wash liquor.In a particular embodiment of the present invention, when acid waste wash liquor pH value is 2, in slurry factory per ton green mud, acid waste wash liquor is preferably 8m with the ClO 2 bleaching used
3~ 10m
3.Slurry factory green mud is after neutralizing treatment, and in the modification green mud obtained, the content of chlorine element is preferably 700mg/kg ~ 1300mg/kg; Potassium content is preferably less than 180mg/kg ~ 190mg/kg; Sodium content is preferably less than 1800mg/kg ~ 1900mg/kg.
After obtaining modification green mud, described modification green mud is carried out processed by the present invention, obtains semi-oriented modification green mud.In the present invention, the device of described processed is preferably sheet frame squeezing deep dehydration machine or horizontal screw centrifuge.The present invention does not have special restriction to described sheet frame squeezing deep dehydration machine or horizontal screw centrifuge, adopts sheet frame well known to those skilled in the art to squeeze deep dehydration machine or horizontal screw centrifuge.In the present invention, described sheet frame squeezing deep dehydration machine is preferably high-pressure polypropylene Chamber Type Diaphragm Filter Press.In the present invention, during described processed, the mass dryness fraction of modification green mud is preferably 3% ~ 5%.
In the present invention, the filter cloth of described sheet frame squeezing deep dehydration machine is preferably the filter cloth of polyamide fibre material; The squeezing feed pressure of described sheet frame squeezing deep dehydration machine is preferably 0.6MPa ~ 1.2MPa; In described sheet frame squeezing deep dehydration machine, the high pressure water squeeze pressure of sheet frame is preferably 1.4MPa ~ 1.8MPa, be more preferably 1.6MPa, wherein, low-pressure feeding pressure is preferably 0.4MPa ~ 0.7MPa, be more preferably 0.6MPa, the low-pressure feeding time is preferably 1900s ~ 2100s, be more preferably 2000s; High pressure feeding pressure is preferably 0.7MPa ~ 1.4MPa, is more preferably 1.0MPa, and the high pressure feeding time is preferably 2400s ~ 2600s, is more preferably 2500s; In described sheet frame squeezing deep dehydration machine, the squeezing time of sheet frame is preferably 1600s ~ 1800s, is more preferably 1700s; The emptying time of described sheet frame squeezing deep dehydration machine is preferably 55s ~ 65s, is more preferably 60s; The radial outflow time of described sheet frame squeezing deep dehydration machine is preferably 55s ~ 65s, is more preferably 60s; The angle blow-time of described sheet frame squeezing deep dehydration machine is preferably 115s ~ 125s, is more preferably 120s; The washing time of described sheet frame squeezing deep dehydration machine is preferably 2h ~ 3h, is more preferably 2.5h.
Concrete, in some embodiments of the invention, described modification green mud high-pressure polypropylene Chamber Type Diaphragm Filter Press carries out processed, obtains semi-oriented modification green mud.In the present invention, the model of described high-pressure polypropylene Chamber Type Diaphragm Filter Press is XAZGFSN600/1600-U; Total filtration area of described high-pressure polypropylene Chamber Type Diaphragm Filter Press is 600m
2, compaction pressure 16MPa ~ 20MPa; Filter plate number 137; Filter plate size 1600mm*1600mm, filter pressure 1.2MPa.
Concrete, in some embodiments of the invention, described modification green mud horizontal screw centrifuge carries out processed, obtains semi-oriented modification green mud.In the present invention, in described horizontal screw centrifuge, the pressure of fresh feed pump is preferably 0.10MPa ~ 0.225MPa, horizontal screw centrifuge input speed is preferably 15L/s ~ 20L/s, is more preferably 18.7L/S.The present invention preferably adopts model to be the horizontal screw centrifuge of D7LC/30B, and D=1580mm, L=4870mm, H=4870mm of the horizontal screw centrifuge of this model, the power of main frame is 132KW, the power of differential speed motor is 37KW.In the present invention, adopt the temperature of horizontal screw centrifuge processed to be preferably 40 DEG C ~ 60 DEG C, be more preferably 50 DEG C; Adopt the differential 15rpm ~ 30rpm of horizontal screw centrifuge processed, being equivalent to the residence time of modification green mud in horizontal screw centrifuge is preferably 90s ~ 150s, is more preferably 120s ~ 140s.
In the present invention, the mass dryness fraction that described modification green mud carries out dewatering is preferably 40% ~ 60%, is more preferably 45% ~ 58%.In the present invention, described mass dryness fraction is the absolute dry mass content of solid content in water per ton.
After obtaining semi-oriented modification green mud, fuel and described semi-oriented modification green mud burn by the present invention, and obtain green mud dregs of incinerator, in described green mud dregs of incinerator, cl content is 0.01% ~ 0.05%; Potassium content is 0.1% ~ 0.4%; Sodium content is 0.5% ~ 1.5%.In the present invention, described fuel preferably includes coal, screenings and wood chip; Described coal is preferably bituminous coal; The mass ratio of described coal, screenings, wood chip and semi-oriented modification green mud is preferably (220 ~ 300): (40 ~ 50): (500 ~ 600): (50 ~ 60), are more preferably (230 ~ 290): (42 ~ 48): (510 ~ 590): (52 ~ 58).
The present invention preferably adopts multi fuel fluidized bed incinerator to burn.In the present invention, described multi fuel fluidized bed incinerator tolerance chlorine element ability is preferably less than 0.29wt%; Tolerance potassium element ability is preferably less than 0.82wt%; Tolerance sodium element ability is preferably less than 0.82wt%; The material of the heat pipe of described multi fuel fluidized bed incinerator is preferably fire resistant anticorrosive steel alloy 12Cr1MoVG.
In the present invention, the First air of described multi fuel fluidized bed incinerator preferably accounts for 50% ~ 60% of boiler total blast volume; Secondary air preferably accounts for 30% ~ 35%; Hp fluid air preferably accounts for 3% ~ 7%;
The filter outlet steam flow of described multi fuel fluidized bed incinerator is preferably 280t/h ~ 300t/h, is more preferably 285t/h ~ 295t/h; Described filter outlet vapor pressure is preferably 8.0MPa ~ 9.0MPa, is more preferably 8.2MPa ~ 8.8MPa; Described filter outlet vapor temperature is preferably 470 DEG C ~ 490 DEG C, is more preferably 475 DEG C ~ 485 DEG C.
In the present invention, the temperature of described burning is preferably 850 DEG C ~ 900 DEG C; The time of described burning is preferably 4s ~ 6s, is more preferably 5s ~ 6s; Circulation ratio 25 times ~ 30 times.
The present invention to the burning of the modification green mud simulation multi fuel fluidized bed incinerator obtained, and carries out minimizing test to modification green mud, and detailed process can be:
By mass dryness fraction be 48.5% the semi-oriented modification green mud of 100g be placed in 500 DEG C of retort furnaces, calcining 0.5h ~ 3h, dry 4 little of constant weight afterwards in electric heating blast dry oven at 105 DEG C, obtain green mud ash content, record the minimizing of modification green mud; The decrement of semi-oriented modification green mud turns to 26.3%;
Green mud ash content obtained above is continued to calcine 0.5h ~ 3h in 900 DEG C of retort furnaces, the green mud ash content obtained is taken out be placed in moisture eliminator be cooled to normal temperature and weigh after calcining, record decrement and turn to 5%; Amount to, the decrement of green mud modification high temperature incineration turns to about 30%.
The present invention carries out the mensuration of chlorine, sodium, potassium content to the green mud ash content after retort furnace 900 DEG C calcining, the chlorine in the green mud ash content after testing after 900 DEG C of calcinings, sodium, potassium content be chlorine in slurry factory green mud, sodium, potassium content 1/30 ~ 1/10.
After burning terminates, the present invention calculates the performance of multi fuel fluidized bed incinerator:
The present invention is according to net calorific value, and boiler calculation efficiency is 90% ~ 93%; Boiler guaranteed efficiency is 89% ~ 92%; Heat loss of imperfect solid combustion is 1% ~ 2%; The outlet dust emission concentration of the preheater of multi fuel fluidized bed incinerator is 36% ~ 40%; The SO of preheater
2emission concentration is 395mg/Nm
3~ 405mg/Nm
3; The NO of preheater
xemission concentration is 245mg/Nm
3~ 255mg/Nm
3; The CO emission concentration of preheater is 195mg/Nm
3~ 205mg/Nm
3.
In certain embodiments of the present invention, the heating power data of multi fuel fluidized bed incinerator, in table 2, table 2 is the heating power data of multi fuel fluidized bed incinerator:
The heating power data of table 2 multi fuel fluidized bed incinerator
| Title | Symbol | Unit | Design |
| As received basis carbon | Car | ％ | 46.5 |
| As received basis hydrogen | Har | ％ | 2.71 |
| As received basis oxygen | Oar | ％ | 9.65 |
| As received basis nitrogen | Nar | ％ | 0.68 |
| As received basis sulphur | Sar | ％ | 0.59 |
| As received basis ash content | Aar | ％ | 16.56 |
| Total water | Mt | ％ | 23.31 |
| As received basis fugitive constituent | Var | ％ | 25 |
| Net calorific value as received basis | Qnet.ar | Kcal/kg | 4056 |
| ? | ? | MJ/kg | 16.98 |
After obtaining green mud dregs of incinerator, described green mud dregs of incinerator is preferably stored to slag and stores in ash can by the present invention, is then delivered to point of destination with cement ash can transport trolley and utilizes.In the present invention, described green mud dregs of incinerator is used as cement raw material adapted; As the blend composition of road foundation earthwork construction; The part substitute soil of extra large earth and rock works is filled out for harbour.Concrete, when green mud dregs of incinerator is used as cement raw material adapted, the impact of this slag on the mechanical property of cement can be eliminated by regulation value formula, and the mechanical property of the cement mixture obtained when its volume is less than or equal to 10% meets the requirement of building material cement.In the present invention, described green mud dregs of incinerator and cement raw material blending are prepared burden as cement raw material; Described cement raw material preferably includes: one or more in gypsum, blended material, calcareous raw material, siliceous raw material, aluminum raw material and ferriferous raw material; Described calcareous raw material preferably includes Wingdale, and described siliceous raw material preferably includes sandstone and/or silica; Described aluminum raw material preferably includes flyash and/or bauxitic clay; Described ferriferous raw material preferably include in iron ore, sulfate slag and copper ashes one or more; Described blended material preferably include in slag, flyash, slag, desulfurated plaster and industrial residue one or more; When described green mud dregs of incinerator and cement raw material blending, the mass content of green mud dregs of incinerator is preferably less than or equal to 10%, is more preferably 5% ~ 9%, most preferably is 7.5%.The present invention is by green mud dregs of incinerator and No. 325 ~ No. 425 cement raw material blending, and the product that blending obtains meets the requirement of general purpose portland cement GB175-2007 national Specification.
The present invention carries out element determination to described green mud dregs of incinerator.The present invention does not have special restriction to element determination method, adopts element determination technical scheme well known to those skilled in the art.Test result shows: the chlorine in green mud dregs of incinerator, potassium, sodium content be all about chlorine in slurry factory green mud, potassium, sodium content 1/50 ~ 1/20; Compared with the above-mentioned chlorine potassium sodium content calcined through retort furnace in the green mud ash content obtained, the content of the chlorine potassium sodium in the slag after the burning of multi fuel fluidized bed incinerator is low.After testing: the cl content burned at 900 DEG C in the green mud dregs of incinerator obtained is 0.01% ~ 0.05%; Potassium content is 0.1% ~ 0.4%; Sodium content is 0.5% ~ 1.5%.
Concrete, composition graphs 1 of the present invention illustrates the treatment process of slurry factory green mud, the schematic flow sheet of the treatment process of the slurry factory green mud that Fig. 1 provides for the embodiment of the present invention:
The present invention by mass dryness fraction be 35% ~ 50% slurry factory green mud be delivered to dregs mixing tank, in green mud stirred tank, pass into the acid waste wash liquor that pH value is 2 ~ 2.5, carrying out neutralization reaction to pH value is 6.0 ~ 9.0, obtains modification green mud; The modification green mud obtained is delivered to autoclave diaphragm sheet frame squeezing machine or horizontal screw centrifuge dewaters, obtains the semi-oriented modification green mud that mass dryness fraction is 50% ~ 60%; The semi-oriented modification green mud obtained and coal, wood chip and screenings are blended in multi fuel Incineration in CFB boiler and burn, obtain green mud dregs of incinerator; The green mud dregs of incinerator obtained is stored to filter residue and stores ash can, with cement ash can transport trolley, green mud dregs of incinerator is transported to required point of destination, can cement raw material adapted be used as, harbour can be used as and fill out extra large dregs batching, also can be used as road foundation dregs batching.
In order to further illustrate the present invention, below in conjunction with embodiment, a kind for the treatment of process of starching factory's green mud provided by the invention being described in detail, but they can not being interpreted as limiting the scope of the present invention.
Embodiment 1
Get the slurry factory green mud 2500 kilograms that mass dryness fraction is 50%, for subsequent use, the composition of described slurry factory green mud is shown in Table 3, and table 3 is component composition and the content of the slurry factory green mud that the embodiment of the present invention 1 adopts;
Get the dioxide peroxide acid pulp washing water 50000L that pH value is 2.5, for subsequent use;
Described slurry factory's green mud and acid pulp washing water are joined in neutralization tank system successively, carries out neutralization reaction, adjust ph to 7.0, obtain modification green mud;
By mass concentration be 5% modification green mud be pumped in high-pressure polypropylene Chamber Type Diaphragm Filter Press, carry out processed, total filtration area 600m of described high-pressure polypropylene Chamber Type Diaphragm Filter Press
2, compaction pressure 16MPa, filter plate number 5, filter plate size 500mm*500mm, filter pressure 1.0MPa; The sheet frame squeezing filter cloth of described high-pressure polypropylene Chamber Type Diaphragm Filter Press adopts polyamide fibre material; The sheet frame squeezing feed pressure of described high-pressure polypropylene Chamber Type Diaphragm Filter Press is the high pressure water squeeze pressure 1.6MPa of 1.0MPa, barrier film sheet frame, wherein, low-pressure feeding pressure 0.6MPa, low-pressure feeding time are 2000s, and high pressure feeding pressure 1.0MPa, high pressure feeding time are 2500 seconds; The sheet frame squeezing time is 1700 seconds, emptying time is 60 seconds, the radial outflow time is 60 seconds, angle blow-time is 120 seconds, and dehydration temperaturre is 50 DEG C, and dewatering time is 2.5 hours, and the mass dryness fraction that obtains dewatering is the semi-oriented modification green mud of 60%;
The semi-oriented modification green mud 2000kg obtained and 18000kg propellant combination are burned, described fuel comprises 11500kg coal, 500kg screenings and 6000kg wood chip, burn in multi fuel fluidized bed incinerator, incineration temperature is 870 DEG C, the burning time is 5 seconds, and circulation ratio 30 times, obtains green mud dregs of incinerator, in described green mud dregs of incinerator, sodium content is 0.45g/kg, and cl content is 0.12 × 10
3mg/kg, potassium content is 0.06g/kg;
Defeated for the green mud dregs of incinerator the obtained cement mill that can be used as is used as cement raw material batching by the present invention, 75kg green mud dregs of incinerator and 1500kg cement raw material are carried out blending, the temperature of blending is room temperature 23 DEG C, and the time of blending, for be needed to determine according to its technique by cement mill, obtains cement mixture.
The present invention carries out Mechanics Performance Testing according to testing method described in technique scheme to the cement mixture obtained.Experimental result shows: cement mixture obtained after the green mud dregs of incinerator obtained with the embodiment of the present invention and cement raw material blending, can meet the requirement of " general purpose portland cement " GB175-2007 national Specification.
The component composition of the slurry factory green mud that table 3 embodiment of the present invention 1 adopts and content
Embodiment 2
Get the slurry factory green mud 2000kg that mass dryness fraction is 45%, for subsequent use, the composition of described slurry factory green mud is shown in Table 4, and table 4 is component composition and the content of the slurry factory green mud that the embodiment of the present invention 2 adopts;
Get the acid waste wash liquor 35m of ClO 2 bleaching that pH value is 2
3, for subsequent use;
Slurry factory green mud and acid waste wash liquor are joined in neutralization tank system, carries out neutralization reaction, adjust ph to 6.5, obtain modification green mud;
By mass concentration be 4% modification green mud be pumped in high-pressure polypropylene Chamber Type Diaphragm Filter Press, carry out processed, total filtration area 600m of described high-pressure polypropylene Chamber Type Diaphragm Filter Press
2, compaction pressure 20MPa, filter plate number 5, filter plate size 500mm*500mm, filter pressure 1.0MPa; The sheet frame squeezing filter cloth of described high-pressure polypropylene Chamber Type Diaphragm Filter Press adopts polyamide fibre material; The sheet frame squeezing feed pressure of described high-pressure polypropylene Chamber Type Diaphragm Filter Press is the high pressure water squeeze pressure 1.6MPa of 1.2MPa, barrier film sheet frame, wherein, low-pressure feeding pressure 0.6MPa, low-pressure feeding time are 2000s, and high pressure feeding pressure 1.0MP, high pressure feeding time are 2500 seconds; The sheet frame squeezing time is 1700 seconds, emptying time is 60 seconds, the radial outflow time is 58 seconds, angle blow-time is 120 seconds, and dewatering time is 3 hours, obtains the semi-oriented modification green mud that mass dryness fraction is 50%;
The semi-oriented modification green mud obtained and fuel are burned, modification green mud 1000kg and 10000kg propellant combination burn, described fuel comprises 7000kg coal, 500kg screenings and 2500kg wood chip, burn in multi fuel fluidized bed incinerator, incineration temperature is 880 DEG C, and the burning time is 6 seconds, circulation ratio 25 times, obtain green mud dregs of incinerator, in described green mud dregs of incinerator, sodium content is 0.43g/kg, and cl content is 0.11 × 10
3mg/kg, potassium content is 0.036g/kg.
The green mud dregs of incinerator obtained is transported to cement mill and is used as cement mixture by the present invention, 50kg green mud dregs of incinerator and 700kg cement raw material are carried out blending, the temperature of blending is room temperature 20 DEG C, and the time of blending, for be needed to determine according to its technique by cement mill, obtains cement mixture.
The present invention carries out Mechanics Performance Testing according to testing method described in technique scheme to the cement raw material batching obtained.Experimental result shows: cement mixture obtained after the green mud dregs of incinerator obtained with the embodiment of the present invention and cement raw material blending, can meet the requirement of " general purpose portland cement " GB175-2007 national Specification.
In addition, the green mud incinerator that the present invention obtains can also be used as the part substitute soil that extra large earth and rock works is filled out at harbour.
The component composition of the slurry factory green mud that table 4 embodiment of the present invention 2 adopts and content
Embodiment 3
Get the slurry factory green mud 2000kg that mass dryness fraction is 35%, for subsequent use, the composition of described slurry factory green mud is shown in Table 5, and table 5 is component composition and the content of the slurry factory green mud that the embodiment of the present invention 3 adopts;
Get the dioxide peroxide acid pulp washing water 30000L that pH value is 2.5, for subsequent use;
Slurry factory green mud and acid waste wash liquor are joined in neutralization tank system successively, carries out neutralization reaction, adjust ph to 7.0, obtain modification green mud;
By mass concentration be 3% modification green mud be pumped in horizontal screw centrifuge and carry out processed, the fresh feed pump pressure of described horizontal screw centrifuge is 0.225MPa, the input speed of horizontal screw centrifuge is 18.7L/s, dehydration temperaturre is 20 DEG C ~ 50 DEG C, adjustment differential, makes the residence time of green mud in horizontal screw centrifuge be equivalent to 100s ~ 140s, continuously dehydrating, until whole green muds all obtains separating and dehydrating, its mass dryness fraction is the semi-oriented modification green mud of 50%;
The semi-oriented modification green mud obtained and fuel are burned, modification green mud 1500kg and 12000kg propellant combination burn, described fuel comprises 9000kg coal, 500kg screenings and 2500kg wood chip, burn in multi fuel fluidized bed incinerator, incineration temperature is 900 DEG C, and the burning time is 6 seconds, circulation ratio 28 times, obtain green mud dregs of incinerator, in described green mud dregs of incinerator, sodium content is 0.41g/kg, and cl content is 0.12 × 10
3mg/kg, potassium content is 0.06g/kg;
The green mud dregs of incinerator obtained is transported to cement mill and is used as cement raw material batching by the present invention, 100kg green mud dregs of incinerator and 900kg cement raw material are carried out blending, the temperature of blending is 25 DEG C, and the time of blending is needed to determine according to its technique by cement mill, obtains cement mixture.
The present invention carries out Mechanics Performance Testing according to testing method described in technique scheme to the cement mixture obtained.Experimental result shows: cement mixture obtained after the green mud dregs of incinerator obtained with the embodiment of the present invention and cement raw material blending, can meet the requirement of " general purpose portland cement " GB175-2007 national Specification.
In addition, the green mud dregs of incinerator that the embodiment of the present invention 3 obtains is used as the blend composition of road foundation earthwork construction.
The component composition of the slurry factory green mud that table 5 embodiment of the present invention 3 adopts and content
As seen from the above embodiment, the invention provides a kind for the treatment of process of starching factory's green mud, comprise the following steps: slurry factory green mud is carried out neutralizing treatment, obtains modification green mud; Described modification green mud is carried out processed, obtains semi-oriented modification green mud; Fuel and described semi-oriented modification green mud are burned, obtain green mud dregs of incinerator, in described green mud dregs of incinerator, cl content is 0.01% ~ 0.05%; Potassium content is 0.1% ~ 0.4%; Sodium content is 0.5% ~ 1.5%.Compared with prior art, treatment process provided by the invention, carries out modification and burning by slurry factory green mud, it is changed into a kind of multi-usage slag of recycling from the industrial refuse of landfill disposal, can prepare burden as cement raw material.In addition, this green mud dregs of incinerator can be used as harbour and fill out extra large dregs batching, also can be used as road foundation dregs batching.Experimental result shows: green mud dregs of incinerator is prepared burden as cement raw material, and the performance of the cement mixture obtained when its volume is and is less than or equal to 10% meets the requirement of building material cement.Treatment process provided by the invention had both saved valuable landfill yard land resources, turn eliminated the long-range circumstances risk that industrial refuse is potential.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the treatment process of a Zhong Jiang factory green mud, comprises the following steps:
Slurry factory green mud is carried out neutralizing treatment, obtains modification green mud;
Described modification green mud is carried out processed, obtains semi-oriented modification green mud;
Fuel and described semi-oriented modification green mud are burned, obtain green mud dregs of incinerator, in described green mud dregs of incinerator, cl content is 0.01% ~ 0.05%; Potassium content is 0.1% ~ 0.4%; Sodium content is 0.5% ~ 1.5%.
2. treatment process according to claim 1, is characterized in that, the mass dryness fraction of described slurry factory green mud is 35% ~ 50%.
3. treatment process according to claim 1, is characterized in that, described neutralizing treatment to pH value is 6 ~ 9.
4. treatment process according to claim 1, is characterized in that, in described processed, the mass dryness fraction of modification green mud is 3% ~ 5%.
5. treatment process according to claim 1, is characterized in that, the device of described processed is sheet frame squeezing deep dehydration machine or horizontal screw centrifuge.
6. treatment process according to claim 5, is characterized in that, in described sheet frame squeezing deep dehydration machine, sheet frame squeezing feed pressure is 0.6MPa ~ 1.2MPa.
7. treatment process according to claim 5, is characterized in that, the fresh feed pump pressure of described horizontal screw centrifuge is 0.1MPa ~ 0.225MPa;
The input speed of described horizontal screw centrifuge is 15L/s ~ 20L/s.
8. treatment process according to claim 1, is characterized in that, it is 40% ~ 60% that modification green mud carries out processed to mass dryness fraction.
9. treatment process according to claim 1, is characterized in that, described fuel comprises coal, screenings and wood chip;
The mass ratio of described coal, screenings, wood chip and semi-oriented modification green mud is (220 ~ 300): (40 ~ 50): (500 ~ 600): (50 ~ 60).
10. treatment process according to claim 1, is characterized in that, the temperature of described burning is 850 DEG C ~ 900 DEG C.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020182A (en) * | 2006-02-16 | 2007-08-22 | 王梅林 | Process of comprehensively utilizing caustic sludge from papermaking industry |
| CN102269412A (en) * | 2010-06-03 | 2011-12-07 | 朱振华 | Papermaking green mud incineration treatment device for conveying green slurry by using pipeline |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020182A (en) * | 2006-02-16 | 2007-08-22 | 王梅林 | Process of comprehensively utilizing caustic sludge from papermaking industry |
| CN102269412A (en) * | 2010-06-03 | 2011-12-07 | 朱振华 | Papermaking green mud incineration treatment device for conveying green slurry by using pipeline |
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Application publication date: 20150121 |