CN109626795A - A kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation - Google Patents
A kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation Download PDFInfo
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- CN109626795A CN109626795A CN201910047987.5A CN201910047987A CN109626795A CN 109626795 A CN109626795 A CN 109626795A CN 201910047987 A CN201910047987 A CN 201910047987A CN 109626795 A CN109626795 A CN 109626795A
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- powdered carbon
- sludge
- flue gas
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- gas purification
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
Abstract
The present invention provides a kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation, including five steps: step 1: metal chloride or metal oxide being added into the sludge containing powdered carbon；Step 2: lye is added in the solution for having regulated powdered carbon metal ion ratio obtained after to step 1, and is sufficiently stirred, control solution ph to 8~12；Step 3: in the solution obtained after to step 2, anionic PAM is added；Step 4: first quickly stirring is added after anionic PAM in the solution obtained after step 3, then is mixed slowly, powdered carbon sludge is obtained；Step 5: the powdered carbon sludge obtained after step 4 being transferred to device for dehydrating sladge waste and carries out dewatering work.The present invention realizes the modification and depth flocculation of active powdered carbon, improves dewatering, the reagent of selection is relatively conventional, and proportion is also relatively easy to control, and cost is relatively low.
Description
Technical field
The present invention relates to technical field of sludge treatment, and in particular to a kind of sintering device flue gas purification Wastewater from Acid Preparation contains powdered carbon
Mud dewatering method.
Background technique
After sintering device flue gas passes through active carbon desulfurization denitration, it can generate in active carbon high-temp resolving containing high concentration two
Sulfur oxide, dusty, highly-saline complicated parsing gas (SRG gas), the gas are analytically sent after tower outlet is discharged to relieving haperacidity
System prepares sulfuric acid.For the stability for guaranteeing sulfuric acid quality and acid making system, wet scrubbing method need to be taken to wash SRG gas
Wash away cooling that is miscellaneous while realizing SRG gas.Contain a large amount of dust (predominantly active powdered carbon), washing process in SRG gas
Enter cleaning solution after being removed, increases suspension content in cleaning solution.Since cleaning solution is to be recycled, suspend in cleaning solution
Object accumulation to it is a certain amount of when will cause the blockings of equipment such as spray column nozzle, circulating slot a series of, thus influence to SRG gas into
Row effective temperature-reducing and removal of impurities, in the stable operation for affecting sintering acid making system of high degree.Therefore, it is necessary to certain to recycling
Cleaning solution outlet and replacement after number, and outlet and replacement produce relieving haperacidity washes.
Relieving haperacidity washes is the waste water of the generation when washing active carbon method carries out washing impurity-removing to SRG gas, also therefore
Wastewater from Acid Preparation processing system can generate two kinds of sludge, both sludge are separately stored in sludge-tank and sludge storage tank, wherein dirty
Sludge in mud sump is alkaline sludge, predominantly left over by history sludge and the precipitated metal salt of current neutralization precipitation process generation,
Its original state is alkalinity；Sludge in sludge storage tank is acid sludge, the metal of predominantly first deep gouge bed mud and ultra-filtration filters
Deposited salt, since its original state is acidity.
Moisture percentage in sewage sludge is higher (moisture content > 95%), and when being transported using sludge vehicle, there are corrosivity weight, sludge is not easily-controllable
The problems such as system, sludge easy evaporating, emitting, dripping or leaking of liquid or gas.Therefore, sludge need to be flocculated, is then further dehydrated by deslimer again,
It is transported outward after the mud cake that moisture content is 80% is made.In sludge dehydration process, the flocculating effect of sludge is to influence its dewatering
One of critical process, and the key of sludge flocculation is the selection of flocculant.
In general, being dehydrated for common sludge, frequently with adding alkali to adjust pH, then make sludge flocculation by the way that flocculant is added
Sedimentation is dehydrated finally by device for dehydrating sladge waste (such as folded spiral shell machine, plate and frame filter press, centrifugal dehydrator), that is, can reach
Send and fill requirement outside.But since sintering device flue gas passes through the sludge that after active carbon desulfurization denitration, generates after washing impurity-removing, cooling
Containing a large amount of active powdered carbon, powdered carbon property is special, and hydrophobicity is stronger, it is difficult to by flocculating setting, dewatering is poor, cause through
Treated that moisture percentage in sewage sludge is still higher for dehydration equipment, it is difficult to reach outward transport and landfill requires, therefore be badly in need of combining production at present
A kind of dusty, high-moisture-contensludge sludge that can be directed to and generate in sintering device flue gas purification Wastewater from Acid Preparation technique is developed with the demand of environmental protection
And it can realize the control method of deep dehydration.
By the existing related open source literature of retrieval discovery, there is problems:
For example State Intellectual Property Office discloses the patent document of Publication No. CN 108147641A, a kind of sludge dewatering
Machine, which is characterized in that described to pressure roller including rack, the first mesh belt, the second mesh belt, dehydration roll, several pairs of pressure rollers and discharge rolls
Including bearing roller and pressure roller, first mesh belt and second mesh belt fit successively around the dehydration roll, each described
To pressure roller and the discharge rolls, the working face of the bearing roller and the working face of the pressure roller are positioned opposite, and described first
Mesh belt is affixed to merge with second mesh belt and pass through between the working face of the bearing roller and the working face of the pressure roller, institute
It states dehydration roll, several pairs of pressure rollers, the discharge rolls and is fixedly installed in the rack respectively.This kind of sludge dewatering equipment is complexity
Mechanical structure, making and putting into production requires higher cost and remakes mechanical equipment and debug to practical to need week
Phase, the process is more complicated.
State Intellectual Property Office discloses the patent document of Publication No. CN 108516657A, a kind of 1. sludge for another example
Reinforcing dewatering, which comprises the following steps: the pH of conditioning of mud；Bacteriolyze enzymatic treatment: institute after adjustment of ph
Addition lysozyme in sludge is stated to be reacted；Dehydration: it will be carried out dehydrating, obtain with the sludge after the bacteriolyze enzyme reaction
To sludge filter cake.The invention has used lysozyme, and lysozyme is added in sludge after adjusting ph, and needs to include that standing 2 is small
When, a series of complex operation such as oscillating reactions 2-8 hours at a constant temperature, and have in the bacteriolyze enzymatic treatment sludge method tight
Lattice temperature control process guarantees the normal work of lysozyme, guarantees that it will not be in excessively high too low at a temperature of inactivation efficiency, condition
Many and diverse harshness needs more demanding processing environment and processing equipment.
State Intellectual Property Office discloses the patent document of Publication No. CN 108863016A, a kind of 1. sludge for another example
The method of dehydration first alkalizes to maize cob meal with sodium hydroxide solution, it is rear be added cetyl trimethylammonium bromide into
Row etherification reaction after filtration drying, pulverizes, obtains modified corn core powder；Modified corn core powder is put by gravity
In sludge after concentration, stirring is stood, and filtering obtains sludge cake；Dirt is obtained after sludge cake is pyrolyzed under an inert atmosphere
Mud mud cake charcoal, pulverizes；Sludge cake biology powdered carbon and modified corn core powder are successively put into pending mud, stirred
Mix standing, filtering.Sludge is made mud cake and also by the sludge cake in inert atmosphere by step (4) in this method
Under, it is required in the processing environment of 650-700 DEG C of pyrolysis 2-2.5h, therefore this method needs and processing equipment cost is excessively high.
Summary of the invention
The present invention in view of the deficiencies of the prior art, specifically provides in a kind of solution sintering device flue gas purification Wastewater from Acid Preparation technique
Dusty, the high-moisture-contensludge sludge generated is difficult to the sludge containing powdered carbon of the sintering device flue gas purification Wastewater from Acid Preparation of the problem of deep dehydration
Dewatering.
The present invention provides a kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation, including five steps
It is rapid:
Step 1: metal chloride or metal oxide being added into the sludge containing powdered carbon；Here with activated carbon surface official
Can group is abundant and the biggish feature of specific surface area, add a certain amount of metal ion under acid condition at this moment, to active carbon into
Row is modified, and active carbon is made to form the compound of active carbon and metal ion；
Step 2: lye is added in the solution for having regulated powdered carbon metal ion ratio obtained after to step 1,
And it is sufficiently stirred, control solution ph to 8~12；At this time by sludge conditioning to alkalinity, be attached to the metal of activated carbon surface from
Son can be converted into indissoluble precipitating, wrap up active carbon by precipitated metal salt, greatly reduce the hydrophobicity of active carbon, to have
It is contacted conducive to anionic PAM in next step, improves flocculating effect；
Step 3: in the solution obtained after to step 2, anionic PAM is added；
Step 4: first quickly stirring is added after anionic PAM in the solution obtained after step 3, then is mixed slowly, is obtained
To powdered carbon sludge；
Step 5: the powdered carbon sludge obtained after step 4 being transferred to device for dehydrating sladge waste and carries out dewatering work.
Further, the particle size range of the powdered carbon is at 1~100 μm.
Further, metal chloride described in step 1 or oxide are to be capable of forming indissoluble precipitating under alkaline condition
Metal chloride or oxide.
Further, the mass ratio to less than 1.5 of powdered carbon and total metal ion is adjusted in step 1 in adition process.
Further, the mass ratio of anionic PAM and powdered carbon is adjusted to 1/ when anionic PAM being added in step 3
In 1000~5/1000 ranges, more preferably 1/400.
Further, the device for dehydrating sladge waste includes folded spiral shell machine, plate and frame filter press, centrifugal dehydrator, more preferably
Folded spiral shell machine.
Beneficial effects of the present invention:
(1) present invention is directed to the special nature of active carbon, is rationally designed, and realizes the modification and depth of active powdered carbon
Flocculation, improves dewatering.
(2) reagent used in the present invention is relatively conventional, and proportion is also relatively easy to control, and avoids using medicament caused by other methods
Disadvantage complicated, at high cost.
(3) metal ion that the present invention is added can be the acid waste water of metal ion, realize metal ion and charcoal
The collaboration of powder removes.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of embodiment of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It better understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
The scope of protection of the invention should belong to.
Method of the invention is mainly applied in the demand of sintering device flue gas purification, in sintering device flue gas field of purification
It come desulphurization denitration is an emerging technology using active carbon, the present invention can be in project implementing process, not in conjunction with production practices
Disconnected optimal control technique and method.
Since powdered carbon is lyophobic dust, it is difficult to be contacted with the PAM (polyacrylamide) of addition, to cannot effectively wad a quilt with cotton
It is solidifying.This method is enriched using activated carbon surface functional group and the biggish feature of specific surface area, adds in acid condition a certain amount of
Metal ion is modified active carbon, and active carbon is made to form active carbon/metal ion compound.When conditioning of mud to alkali
Property when, be attached to activated carbon surface metal ion can be converted into indissoluble precipitating, wrap up active carbon by precipitated metal salt, greatly
Reduce the hydrophobicity of active carbon, to be conducive to contact with anionic PAM, improve flocculating effect.
Therefore to the sludge containing powdered carbon of the sintering device flue gas purification Wastewater from Acid Preparation in the waste water of sintering device flue gas purification relieving haperacidity
Dewatering is specific as follows:
It can be produced in the sludge storage tank of the relieving haperacidity washes generated and Wastewater from Acid Preparation processing system when sintering device flue gas purifies
Raw two kinds of sludge, both sludge are separately stored in sludge-tank and sludge storage tank, and wherein the sludge in sludge-tank is alkaline dirty
The precipitated metal salt that mud, predominantly left over by history sludge and current neutralization precipitation process generate, original state are alkalinity.Sludge
Sludge in storage tank is then acid sludge, and predominantly just the precipitated metal salt of deep gouge bed mud and ultra-filtration filters, original state are
It is acid.
It is dehydrated for common sludge, frequently with adding alkali to adjust pH, then settles sludge flocculation by the way that flocculant is added, most
It is dehydrated afterwards by device for dehydrating sladge waste (such as folded spiral shell machine, plate and frame filter press, centrifugal dehydrator), that is, can reach and send outside and fill out
Bury requirement.But since sintering device flue gas is by the way that after active carbon desulfurization denitration, the sludge generated after washing impurity-removing, cooling contains largely
Active powdered carbon, powdered carbon property is special, and hydrophobicity is stronger, it is difficult to which by flocculating setting, dewatering is poor, causes through dehydration equipment
Treated, and moisture percentage in sewage sludge is still higher, it is difficult to reach outward transport and landfill requires, therefore be badly in need of opening in conjunction with production with ecological requirements
Sending out a kind of can be for the dusty, high-moisture-contensludge sludge generated in sintering device flue gas purification Wastewater from Acid Preparation technique, it can be achieved that depth is de-
The control technique and method of water.
Embodiment 1
Step 1: metal chloride or metal oxide being added into the sludge containing powdered carbon, adjusts powdered carbon and total metal ion
Mass ratio to less than 1.5, preferably 1.The metal chloride or oxide are to be capable of forming what indissoluble precipitated under alkaline condition
Metal chloride or oxide.Here with activated carbon surface functional group is abundant and the biggish feature of specific surface area, at this moment
A certain amount of metal ion is added under acid condition, active carbon is modified, and active carbon is made to form active carbon and metal ion
Compound；Wherein, the particle size range of the powdered carbon is at 1~100 μm, and preferably 10~50 μm, the metal chloride or oxidation
Object includes but is not limited to one of iron, copper, lead, calcium, zinc, cadmium, cobalt, nickel, aluminium salt or a variety of；
Step 2: lye is added in the solution for having regulated powdered carbon metal ion ratio obtained after to step 1,
And it is sufficiently stirred, control solution ph to 8~12, preferably 8~9；At this time by sludge conditioning to alkalinity, it is attached to active carbon table
The metal ion in face can be converted into indissoluble precipitating, wrap up active carbon by precipitated metal salt, greatly reduce dredging for active carbon
It is aqueous, to be conducive to contact with anionic PAM in next step, improve flocculating effect；Anionic PAM in the step 2
It is preferred that liking the PHP-3 of gloomy (China) flocculant Co., Ltd emulsion-type TC-PAM-HL-39 type flocculant and Guangzhou Fine Chemical Works
Type flocculant, most preferably the PHP-3 type flocculant of Guangzhou Fine Chemical Works among these, the flocculant are particularly suited for
Technical field and processing environment required for the present invention.The lye can be one of OH-, CO32-, HCO3- or a variety of, excellent
Select readily soluble hydroxide, carbonate or bicarbonate；It is further preferred that for sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate,
One of potassium carbonate, sodium bicarbonate, saleratus or a variety of mixtures；
Step 3: in the solution obtained after to step 2, anionic PAM is added, at this time by anionic PAM and charcoal
The mass ratio of powder is adjusted in 1/1000~5/1000 range, and preferably 1/400；
Step 4: first quickly stirring is added after anionic PAM in the solution obtained after step 3, then is mixed slowly, is obtained
To powdered carbon sludge；
Step 5: the powdered carbon sludge obtained after step 4 being transferred to device for dehydrating sladge waste and carries out dewatering work, the sludge is de-
Wetting system includes folded spiral shell machine, plate and frame filter press, centrifugal dehydrator, preferably folded spiral shell machine.
Embodiment 2
Other steps of the invention are constant, and metal chloride or gold will be added in wherein step 1 into the sludge containing powdered carbon
The metal chloride or metal oxide belonged in this step of oxide is changed to select the acid waste water of metal ion, at this time according to it
The constant principle of its step is got off, and after dehydration, the present invention can realize that the collaboration to metal ion and powdered carbon removes, non-
Normal environment friendly convenient.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (6)
1. a kind of mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation, which is characterized in that including five steps:
Step 1: metal chloride or metal oxide being added into the sludge containing powdered carbon；
Step 2: lye is added in the solution for having regulated powdered carbon metal ion ratio obtained after to step 1, and fills
Divide stirring, control solution ph to 8~12；
Step 3: in the solution obtained after to step 2, anionic PAM is added；
Step 4: first quickly stirring is added after anionic PAM in the solution obtained after step 3, then is mixed slowly, charcoal is obtained
Powder sludge；
Step 5: the powdered carbon sludge obtained after step 4 being transferred to device for dehydrating sladge waste and carries out dewatering work.
2. the mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation according to claim 1, feature exist
In the particle size range of the powdered carbon is at 1~100 μm.
3. the mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation according to claim 1, feature exist
In, metal chloride described in step 1 or oxide be capable of forming under alkaline condition indissoluble precipitating metal chloride or
Oxide.
4. the mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation according to claim 1, feature exist
In the mass ratio to less than 1.5 of powdered carbon and total metal ion is adjusted in step 1 in adition process.
5. the mud dewatering method containing powdered carbon of sintering device flue gas purification Wastewater from Acid Preparation according to claim 1, feature exist
In the mass ratio of anionic PAM and powdered carbon is adjusted to 1/1000~5/1000 model when anionic PAM being added in step 3
In enclosing.
6. the mud dewatering method containing powdered carbon of the sintering device flue gas purification Wastewater from Acid Preparation according to claim 1,
It is characterized in that, the device for dehydrating sladge waste includes folded spiral shell machine, plate and frame filter press, centrifugal dehydrator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113526839A (en) * | 2020-04-22 | 2021-10-22 | 深圳市深水生态环境技术有限公司 | Novel high-dry sludge dewatering agent and application method thereof |
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