CN106915809A - A kind of formula of dense media powder for water process, preparation method and application method - Google Patents
A kind of formula of dense media powder for water process, preparation method and application method Download PDFInfo
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- CN106915809A CN106915809A CN201710223746.2A CN201710223746A CN106915809A CN 106915809 A CN106915809 A CN 106915809A CN 201710223746 A CN201710223746 A CN 201710223746A CN 106915809 A CN106915809 A CN 106915809A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of formula of the dense media powder for water process, including main matter and dispensing：Main matter is Fe3O4, account for 85% the 99.5% of gross mass；Dispensing includes MnO, SiO2、ZnO、TiO2、CuO、Al2O3、CaO、MgO、Bi2O3In one or more；A kind of preparation method of the dense media powder for water process is also disclosed, comprises the following steps：Raw material, grinding, a magnetic separation, drying, roasting, screening and secondary magnetic separation are weighed, the finished product of dense media powder is produced；A kind of application method of the dense media powder for water process is also disclosed, and the pending raw water need to successively flow through mixing pit, primary flocculation basin, flocculation tank, sedimentation basin and water outlet after ultrafiltration membrane pool；The dense media powder for being produced is applied to running water and sewage disposal, bigger than micro- sand density and be more easily recycled utilization, influence smaller to subsequent handling, while this product can reduce cost of investment, improves drinking water treatment efficiency.
Description
Technical field
The present invention relates to water-treatment technology field, it is particularly suited for the materializing strategy neck of sewage disposal and water treatment
Domain, and in particular to a kind of formula of dense media powder for water process, preparation method and application method.
Background technology
In recent years, as various regions water environment pollution situation is on the rise, society is to water technology and its effect
It is required that also increasingly improving.Either newly-built sewage treatment plant or waterworks, also either to existing sewage treatment plant or from
That comes water factory proposes mark transformation, is required for efficient, the new technology of compact, new technology.
Coagulating sedimentation is wide variety of process in a kind of water treatment field.The technique is used in pending raw water
In add the medicament with cohesion ability（Coagulant/flocculation aid）Method, in making water by mechanisms such as adsorption bridgings
The impurity such as trickle suspended particles, colloidal particle or pollutant form floc sedimentation, and precipitate, so as to reach purifying water effect.
The patent of invention of Patent No. 201180030555.5 proposes to locate by implementing the ballasted flocculation of natural flocculating agent
The method for managing water, micro- sand of 60 to 300 microns of Selection utilization particle diameter participates in ballasted flocculation, to improve flocculation efficiency.Due to micro- sand
Density be about 2.5 g/cm3Although the density than water is big, and its density is also insufficient to greatly, and in actual production process
Usually also no can precipitation completely has been floated to next procedure to tiny flco containing sand with current, is commonly called as " race sand ", causes rear road
The bad influence such as the blocking of pipeline, the damage of water pump vane, damage of ultrafiltration membrane filaments in operation.
Dense media coagulation-settlement process is just to have grown up in recent years, opened on the basis of above-mentioned traditional water treatment technology
A kind of very fast coagulating sedimentation technology of hair（The patent No.：201620549866.2,201520658253.8 etc.）, the technology is in Xiang Shui
In while add normal coagulation agent and/or flocculant, add micron-sized inertia high density soft magnetic dense media particulate conduct
Flocculation core, quick under more excellent hydraulics to form high concentration, the compound flco of big density, the compound flco can be when extremely short
Interior completion precipitation process, and water body is purified rapidly.To reduce water treatment system operating cost and reducing dense media powder
Influence to water process later process, dense media coagulation-settlement process passes through dense media powder flco cracking flossing machine（The patent No.
201520658318.9,201520561702.7）Xie Xuhou is carried out to flco, then by dense media powder seperator（The patent No.
201520059633.X）Reclaimed using the soft magnetism dense medium powder of dense media powder, realized recycling for dense media powder.
Above-mentioned micron-sized inertia high density soft magnetic dense media particulate, abbreviation dense media or dense media powder.With it is traditional
Water process coagulation-settlement process and micro- sand coagulation-settlement process are compared, and dense media coagulation-settlement process can reduce 20% to 50%
Sedimentation time and sedimentation basin land seizure area, further, be also greatly reduced under equal water process scale and built into
This, or the disposal ability that water treatment plant also greatly improved under equal land seizure area.
Therefore, in the market be badly in need of being applied to running water and sewage disposal, it is bigger than micro- sand density and be more easily recycled utilization,
Smaller new dense media powder product is influenceed on subsequent handling；This product can reduce investment, operating cost simultaneously, improve water
Treatment effeciency.
The content of the invention
The purpose of the present invention is to solve the shortcomings of the prior art, there is provided one kind is applied to running water and sewage disposal, ratio
Micro- sand density it is bigger and be more easily recycled utilize, subsequent handling is influenceed the smaller dense media powder for water process formula,
Preparation method and application method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of dense media powder for water process
Formula, particle size range is that the mesh of 200 mesh -300 accounts for more than the 75% of dense media powder cumulative volume in the dense media powder, and its innovative point exists
In：Including main matter and dispensing：The main matter is Fe3O4, the Fe3O4Account for the 85%-99.5% of gross mass；It is described to match somebody with somebody
Material includes MnO, SiO2、ZnO、TiO2、CuO、Al2O3、CaO、MgO、Bi2O3In one or more, it is every kind of in the dispensing
Composition accounts for the 0.01%-8% of gross mass.
It is of the invention it is also an object that providing a kind of preparation method of dense media powder for water process, its innovative point exists
In：Specifically include following steps：
（1）Weigh raw material：Main matter Fe is weighed by formula rate3O4；
（2）Grinding：The primary raw material that will be weighed is put into milling apparatus, is mixed and is ground；Obtain the purposes of particle diameter ＜ 200
Raw powder；
（3）Magnetic separation：The powder feeding magnetic separator that preliminary Particle size requirements will be met after grinding carries out a magnetic separation, and removal is wherein
Namagnetic substance；
（4）Drying：Powder after removal namagnetic substance is dehydrated and is dried, the moisture in removal powder；
（5）Roasting：By the dried powder after drying, with MnO, ZnO, Al2O3、CaO、MgO、Bi2O3、SiO2、TiO2, in CuO
During one or more is sent into rotary calciner together according to the ratio in formula, it is calcined in mixing；
（6）Screening：After semi-finished product after being finished to roasting gradually cool to normal temperature, sieved, screen out and meet Particle size requirements
The semi-finished product of the mesh of 300 mesh -200, step is re-started by particle diameter more than the semi-finished product of 200 mesh（2）Grinding；Will be less than 300 mesh
Semi-finished product, after carrying out granulation treatment, re-start step（2）Grinding；
（7）Secondary magnetic separation：The secondary magnetic separation of semi-finished product to meeting Particle size requirements after screening, removes namagnetic substance again, produces
Go out the finished product of dense media powder；Magnetisable material content ＞ 90% in the dense media powder, particle size range accounts for weight for the mesh of 200 mesh -300
More than the 75% of medium powder cumulative volume, real density is 3.5-5.5g/cm3。
Further, the step（2）In grinding step use ball mill or airflow mill；During from ball mill, choosing
The one kind in wet-milling is carried out as disperse means with steel ball dry grinding, Ceramic Balls dry grinding or using distilled water or deionized water.
Further, the step（4）In baking operation, drying temperature be 90-100 DEG C, drying time is 1-3h.
Further, the step（5）In calcining process, oxygen concentration is set to 0.0%-4.5%, temperature rise during roasting
Time is 1-3h, and sintering temperature is 600 DEG C -850 DEG C, and roasting time is 3-4h.
Further, the step（6）In be cooled to the time used by normal temperature for 1-3h, oxygen concentration during cooling is set
Oxygen concentration during for roasting, carries out atmosphere protection；The step（6）Middle screening operation selects double-deck screening machine, for exceeding
The particle of the mesh scope of 300 mesh of Particle size requirements -200 is separated.
Further, the step（6）In prilling use mist projection granulating, during granulation, slurry temperature is set to
40 DEG C -50 DEG C, add polyvinyl alcohol（PVA）Or methylcellulose（CMC）As binder, diameter is formed in the purpose of 50 mesh -200
Particle.
It is a still further object of the present invention to provide a kind of application method of the dense media powder for water process, its innovative point exists
In：Comprise the following steps：The pending raw water need to successively flow through mixing pit, primary flocculation basin, flocculation tank, sedimentation basin
With water outlet after ultrafiltration membrane pool；
A. pending raw water is passed through to pump into or gravity stream enters in mixing pit, coagulant is added in mixing pit；Unlatching is stirred
The machine of mixing is stirred, and stir speed (S.S.) is 200-350s-1, mixing time is 2-5min；So that coagulant is abundant with pending raw water
Mixing；
B. the raw water for being added with coagulant enters primary flocculation basin, and dense media powder is added in primary flocculation basin；Open mixer
It is stirred, stir speed (S.S.) is 150-300s-1, mixing time is 2-6min；
C. the water of addition coagulant and dense media powder enters flocculation tank, and flocculation aid is added in flocculation tank, and unlatching is stirred
The machine of mixing is stirred, and stir speed (S.S.) is 40-150s-1, mixing time is 2-6min；So that the sludge impurity in raw water progressively condenses
Into flco；
D. in flocculation tank the water containing flco into being precipitated in sedimentation basin；
E. the clear water on sedimentation basin upper strata enters ultrafiltration membrane pool, carries out ultrafiltration membrance filter treatment, is further carried out disinfecting, shape
Dispatched from the factory into drinking public water supply；
F. the flco sediment of sedimentation basin bottom is pumped into cracking flossing machine, is smashed sludge flco using cracking flossing machine so that sludge is miscellaneous
Matter is separated with dense media powder wadding core, then, will solve the material feeding dense media recycling machine pair such as sludge, dense media powder, water after wadding
Dense media powder therein is reclaimed, and the dense media powder after recovery continues to participate in flocculation instead in putting into primary flocculation basin again
Should, realize recycling for dense media powder.
Further, the motor speed of cracking flossing machine is 900-3000r/min in the step f；The dense media recycling machine
The magnetic induction intensity of cylinder surface be magnetic flux ＞ 150mT.
Further, the addition of coagulant is 10-20mg/L in the step a；Dense media powder adds in the step b
Dosage is 8-12mg/L；The addition of flocculation aid is 0.1-0.2mg/L in the step c.
Beneficial effects of the present invention are as follows：
1. the dense media powder that the preparation method of the dense media powder for water process of the invention is produced is applied to running water and dirt
It is water process, bigger than micro- sand density and be more easily recycled utilization, smaller influenceed on subsequent handling, while this product can be reduced
Cost of investment, improves drinking water treatment efficiency.
2. magnetic material content in the dense media powder that the preparation method of the dense media powder for water process of the invention is produced
＞ 90%, finished product density is big, its be wad a quilt with cotton karyomorphism into flco than micro- sand be karyomorphism into flco be easier precipitation, magnetic content is more
Height, is recovered more easily and recycles than micro- sand.
3. in the preparation method for the dense media powder of water process of the invention, firing stage add MnO, ZnO,
Al2O3、CaO、MgO、Bi2O3、SiO2、TiO2, one or more in CuO, the stability of dense media powder can be both effectively ensured
Can characteristic so that dense media powder is high via the organic efficiency of dense media recycling machine under varying environment at all seasons；Also make simultaneously
Obtain dense media powder microparticle surfaces to be fully passivated, it is to avoid minimal amount of suspension dense media powder flco is entering follow-up super with current loss
In the filtering technology stage, ultrafiltration membrane surface is formed and is injured, effectively delayed the service life of milipore filter.
4. in the application method for the dense media powder of water process of the invention, appropriate weight is added in primary flocculation basin
Medium powder, it is agitated it is uniform after, dense media powder flows into flocculation tank with current, in primary flocculation basin and flocculation tank
In, dense media powder progressively participates in flocculation reaction as wadding core, accelerates flocculation reaction speed, shortens flco and forms the time, carries
The mass density of flco high, so that flco improves treatment effect into floc settling velocity is also accelerated after sedimentation basin.
5. in the application method for the dense media powder of water process of the invention, the dirt in cracking flossing machine autoprecipitation in future pond is used
Mud floc sedimentation is smashed so that sludge impurity is separated with dense media wadding core, is then immediately entered dense media recycling machine dense medium powder and is entered
Row is reclaimed, and the rate of recovery reaches more than 98%, then the dense media powder after recovery rejoined into primary flocculation basin, realizes dense medium
The repetitive cycling of matter powder is utilized.
Brief description of the drawings
Fig. 1 is a kind of process chart of the preparation method of dense media powder for water process of the invention.
Fig. 2 is a kind of process chart of the application method of dense media powder for water process of the invention.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages of the invention and effect easily.
A kind of formula of dense media powder for water process, particle size range accounts for dense media for the mesh of 200 mesh -300 in dense media
More than the 75% of powder cumulative volume, formula includes main matter and dispensing：The main matter is Fe3O4, Fe3O4Account for gross mass
85%-99.5%；Dispensing includes MnO, SiO2、ZnO、TiO2、CuO、Al2O3、CaO、MgO、Bi2O3In one or more, dispensing
In every kind of composition account for the 0.01%-8% of gross mass.
As shown in figure 1, a kind of preparation method of dense media powder for water process, specifically includes following steps：
（1）Weigh raw material：The main matter Fe with soft magnetism is weighed by formula rate3O4；
（2）Grinding：The main matter that will be weighed is put into milling apparatus, is mixed and is ground；Obtain the purposes of particle diameter ＜ 200
Raw powder；Grinding step uses tumbling ball mill or airflow mill；During from tumbling ball mill, it is possible to use steel ball dry grinding,
One kind that Ceramic Balls are dry grinded or carried out as disperse means using distilled water or deionized water in wet-milling.During steel ball wet-milling, powder with
Steel ball, the level of water are m with ratio（Material）：m（Steel ball）：m（Water）=1：（2~3.2）：（0.7~0.9）.
（3）Magnetic separation：The powder feeding magnetic separator that preliminary Particle size requirements will be met after grinding carries out a magnetic separation, removes
Namagnetic substance therein；
（4）Drying：Powder after removal namagnetic substance is dehydrated and is dried, the moisture in removal powder；Baking operation,
Drying temperature is 90-100 DEG C, and drying time is 1-3h.
（5）Roasting：By the dried powder after drying, with MnO, ZnO, Al2O3、CaO、MgO、Bi2O3、SiO2、TiO2、CuO
In send into rotary calciner together according to the ratio in formula one or more, be calcined in mixing；Calcining process, roasting
When oxygen concentration is set to 0.0%-4.5%, temperature rising-time is 1-3h, and sintering temperature is 600 DEG C -850 DEG C, and roasting time is 3-
4h.In preparation method for the dense media powder of water process of the invention, in firing stage, raw material on a small quantity may be to water quality
Volatile impurity of secondary pollution is produced to be removed, meanwhile, in this stage, add MnO, ZnO, Al2O3、CaO、MgO、
Bi2O3、SiO2、TiO2, one or more dispensing in CuO, its fluxing action, or cause different metal oxygens in raw material, dispensing
The solid phase reaction occurred between compound, can both be effectively ensured the temperature performance characteristic of dense media powder so that dense media powder is one
It is high via the organic efficiency of dense media recycling machine under year four seasons different temperatures environment；Also cause that dense media powder microparticle surfaces fill simultaneously
Divide passivation, it is to avoid minimal amount of suspension dense media powder flco is lost in into subsequent ultrafiltration operation stage, to milipore filter with current
Surface forms injury, has effectively delayed the service life of milipore filter.
（6）Screening：After semi-finished product after being finished to roasting gradually cool to normal temperature, sieved, screen out and meet particle diameter
Area requirement is the semi-finished product of the mesh of 300 mesh -200.Meanwhile, particle diameter is re-started into step more than the semi-finished product of 200 mesh（2）Grind
Mill；By less than the semi-finished product of 300 mesh, after carrying out granulation treatment, step is re-started（2）Grinding；Wherein, it is cooled to normal temperature institute
It is 1-3h with the time, oxygen concentration during cooling is set to oxygen concentration during roasting, carries out atmosphere protection；Wherein, screener
Sequence for being separated beyond the particle of the mesh of 200 mesh of Particle size requirements -300, and causes that particle diameter distribution is from double-deck screening machine
The mesh of 200 mesh -300 is more than 75%.Granulation treatment uses atomizing granulating technology, during granulation, slurry temperature is set into 40 DEG C -50 DEG C,
Add polyvinyl alcohol（PVA）Or methylcellulose（CMC）Deng adhesive, particle of the diameter in the mesh of 50 mesh -200 is formed.
（7）Secondary magnetic separation：The secondary magnetic separation of semi-finished product to meeting Particle size requirements after screening, removes nonmagnetics again
Matter, the finished product of output dense media powder；Magnetisable material content ＞ 90% in the dense media powder finished product, particle diameter is the mesh of 200 mesh -300
More than the 75% of dense media powder cumulative volume is accounted for, real density is 3.5-5.5g/cm3.Dense media powder for water process of the invention
Magnetic material content ＞ 90%, finished product density is big in the dense media powder that preparation method is produced, its be wad a quilt with cotton karyomorphism into flco than sand more
Easily precipitate, magnetic content is higher, is recovered more easily than sand and recycled.
As shown in Fig. 2 a kind of application method of dense media powder for water process, comprises the following steps：Pending original
Water need to successively flow through mixing pit, primary flocculation basin, flocculation tank, sedimentation basin and water outlet after ultrafiltration membrane pool；
A. by pending raw water pump into or through gravity stream flow into mixing pit in, coagulant is added in mixing pit；Coagulant
Addition is 10-20mg/L；Open mixer to be stirred, stir speed (S.S.) is 200-350s-1, mixing time is 2-5min；Make
Coagulant is obtained to be sufficiently mixed with pending raw water；
B. the raw water gravity flow for being added with coagulant enters primary flocculation basin, and dense media powder is added in primary flocculation basin；Dense media
The addition of powder is 50-200mg/L；Open mixer to be stirred, stir speed (S.S.) is 150-300s-1, mixing time is 2-
6min；
C. the water gravity flow for being added with coagulant and dense media powder enters flocculation tank, and flocculation aid is added in flocculation tank,
The addition of flocculation aid is 0.1-0.2mg/L；Open mixer to be stirred, stir speed (S.S.) is 40-150s-1, mixing time is
2-6min；So that the sludge impurity such as trickle suspended particles, colloidal particle in raw water is progressively condensed into flco；
D. in flocculation tank the water gravity flow containing flco into being precipitated in sedimentation basin；
E. the clear water gravity flow on sedimentation basin upper strata enters ultrafiltration membrane pool, carries out ultrafiltration membrance filter treatment, is further carried out at sterilization
Reason, forms drinking public water supply and dispatches from the factory；
F. the flco sediment of sedimentation basin bottom is pumped into cracking flossing machine, is smashed flco using cracking flossing machine so that sludge impurity with
Dense media wadding core is separated, and then, the material of Xie Xuhou is reclaimed into dense media recycling machine dense medium powder, the weight after recovery
Medium powder continues to participate in flocculation reaction in putting into primary flocculation basin, realizes recycling for dense media powder.Wherein, cracking flossing machine
Motor speed is 900-3000r/min；The magnetic induction intensity of the cylinder surface of the dense media recycling machine（Magnetic flux）＞
150mT.In application method for the dense media powder of water process of the invention, appropriate dense media is added in primary flocculation basin
Powder, it is agitated it is uniform after, dense media powder flows into flocculation tank with current, in primary flocculation basin and flocculation tank, weight
Medium powder progressively participates in flocculation reaction as wadding core, accelerates flocculation reaction speed, shortens flco and forms the time, improves wadding
The mass density of body, so that flco improves treatment effect into floc settling velocity is also accelerated after sedimentation basin.
In application method for the dense media powder of water process of the invention, the sludge in cracking flossing machine autoprecipitation in future pond is used
Floc sedimentation is smashed so that sludge impurity is separated with dense media wadding core, and then immediately entering dense media recycling machine dense medium powder is carried out
Reclaim, realize the recycling of dense media powder, the rate of recovery reaches more than 98%, then dense media powder added into primary flocculation basin,
Realize that the repetitive cycling of dense media powder is utilized.
The dense media powder that the preparation method of the dense media powder for water process of the invention is produced be applied to running water and
It is sewage disposal, bigger than micro- sand density and be more easily recycled utilization, smaller influenceed on subsequent handling, while this product can drop
Low investment cost, improves drinking water treatment efficiency.
Choose three parts of equivalent THE LOWER YANGTZE VALLEY section river as pending raw water, its turbidity be 55 ~ 60NTU, COD be 3 ~
5mg/L, after mixing pit, primary flocculation basin, flocculation tank, sedimentation basin are flowed through successively, the water outlet after ultrafiltration membrance filter；
Embodiment 1
10mg/L coagulant is added in mixing pit, the dense media powder of 100mg/L is added in primary flocculation basin, in flocculation reaction
0.1mg/L flocculation aids, the mixer in mixing pit, primary flocculation basin, flocculation tank is added to press certain speed respectively in pond
It is stirred, design G values are respectively 350s-1、300 s-1、150s-1, design mixing time and be respectively 2min, 2min, 2min, make
The coagulant and flocculation aid of accessing pending water is added to be thoroughly mixed with water, so, in reaction tank, sludge, glue in raw water
The pollutants such as body impurity progressively condense after forming flco in primary flocculation basin and flocculation tank, realize that flco sinks in sedimentation basin
Form sediment, the sedimentation basin residence time is 10min, designs upward flow flow velocity 20m/h, takes sedimentation basin water outlet, ultra-filtration water and is analyzed.It is flat
Row experiment 3 times.
Embodiment 2
10mg/L coagulant is added in mixing pit, 100mg/L, the mesh of 200 mesh -300 are added in primary flocculation basin（More than 75%）
Micro- sand of particle diameter, adds 0.1mg/L flocculation aids, stirring in mixing pit, primary flocculation basin, flocculation tank in flocculation tank
Mix machine to be stirred by certain speed respectively, design G values are respectively 350s-1、300 s-1、150s-1, design mixing time point
Not Wei 2min, 2min, 2min, the coagulant and flocculation aid of addition accessing pending water is thoroughly mixed with water, so, reaction
The pollutants such as Chi Zhong, the sludge impurity in raw water progressively condense after forming flco in primary flocculation basin and flocculation tank,
Sedimentation basin realizes that flco is precipitated, and the sedimentation basin residence time is 15min, designs upward flow flow velocity 20m/h, take sedimentation basin water outlet,
Ultra-filtration water is analyzed.Parallel test 3 times.
Embodiment 3
10mg/L coagulant is added in mixing pit, dense media particulate or micro- sand are added without in primary flocculation basin, it is anti-in flocculation
Ying Chizhong adds 0.1mg/L flocculation aids, the mixer in mixing pit, primary flocculation basin, flocculation tank to press certain speed respectively
Degree is stirred, and design G values are respectively 350s-1、300 s-1、150s-1, design mixing time and be respectively 2min, 2min, 2min,
The coagulant and flocculation aid of addition accessing pending water is set to be thoroughly mixed with water, so, in reaction tank, the sludge in raw water is miscellaneous
The pollutants such as matter progressively condense after forming flco in primary flocculation basin and flocculation tank, realize that flco is precipitated in sedimentation basin,
The sedimentation basin residence time is 90min, designs upward flow flow velocity 20m/h, takes sedimentation basin water outlet, ultra-filtration water and is analyzed.It is flat
Row experiment 3 times.
Comparative example 1, embodiment 2 and embodiment 3, it is of the invention to be used for water for water process dense media powder application method
In processing procedure, the influence to turbidity in water body and COD is as shown in the table：
| Performance indications | Precipitation delivery turbidity（NTU） | Precipitation water outlet COD（mg/L） | Ultra-filtration water turbidity（NTU） |
| Embodiment 1- dense media | 1.0-1.5 | 2.0-2.2 | 0.02-0.04 |
| The micro- sand of embodiment 2- | 3.9-4.8 | 2.3-2.5 | 0.03-0.07 |
| Embodiment 3- tradition flocculations | 19.5-21.4 | 2.4-2.9 | 0.06-0.15 |
Contrast upper table understands that embodiment 1, embodiment 2 and embodiment 3 are flocculated and traditional coagulating sedimentation relative to micro- sand, using this
When the dense media coagulating sedimentation that dense media particulate is provided in invention to be carried out is used for water process, with faster, more preferable water process
Effect, on subsequent handling influence it is smaller, drinking water treatment efficiency can be effectively improved.
A kind of dense media powder for water process provided by the present invention, when water treatment is applied to, it is necessary to pass through
To the appropriate control that this is formulated, dense media powder is set to be oozed in water in the absence of harmful heavy metal ion in practical application
Analysis, or dense media powder dialysis degree of heavy metal ion in water is satisfied with《Standards for drinking water quality》GB5749-
2006 requirement.
Above-described embodiment is presently preferred embodiments of the present invention, is not the limitation to technical solution of the present invention, as long as
Without the technical scheme that creative work can be realized on the basis of above-described embodiment, it is regarded as falling into patent of the present invention
Rights protection scope in.
Claims (10)
1. the formula of a kind of dense media powder for water process, particle size range accounts for weight for the mesh of 200 mesh -300 in the dense media powder
More than the 75% of medium powder cumulative volume, it is characterised in that：Including main matter and dispensing：The main matter is Fe3O4, it is described
Fe3O4Account for the 85%-99.5% of gross mass；The dispensing includes MnO, SiO2、ZnO、TiO2、CuO、Al2O3、CaO、MgO、Bi2O3In
One or more, the every kind of composition in the dispensing accounts for the 0.01%-8% of gross mass.
2. a kind of preparation method for producing the dense media powder for water process according to claim 1, its feature exists
In：Specifically include following steps：
（1）Weigh raw material：Main matter Fe is weighed by formula rate3O4；
（2）Grinding：The primary raw material that will be weighed is put into milling apparatus, is mixed and is ground；Obtain the purposes of particle diameter ＜ 200
Raw powder；
（3）Magnetic separation：The powder feeding magnetic separator that above-mentioned preliminary Particle size requirements will be met after grinding carries out a magnetic separation, removes
Namagnetic substance therein；
（4）Drying：Powder after removal namagnetic substance is dehydrated and is dried, the moisture in removal powder；
（5）Roasting：By the dried powder after drying, with MnO, ZnO, Al2O3、CaO、MgO、Bi2O3、SiO2、TiO2, in CuO
During one or more is sent into rotary calciner together according to the ratio in formula, it is calcined in mixing；
（6）Screening：After semi-finished product after being finished to roasting gradually cool to normal temperature, sieved, screen out and meet Particle size requirements
The semi-finished product of the mesh of 200 mesh -300, step is re-started by particle diameter more than the semi-finished product of 200 mesh（2）Grinding；Will be less than 300 mesh
Semi-finished product, after carrying out granulation treatment, re-start step（2）Grinding；
（7）Secondary magnetic separation：Semi-finished product to meeting Particle size requirements after screening carry out secondary magnetic separation, and nonmagnetics is removed again
Matter, the finished product of output dense media powder；Magnetisable material content ＞ 90% in the dense media powder, particle size range is the mesh of 200 mesh -300
More than the 75% of dense media powder cumulative volume is accounted for, real density is 3.5-5.5g/cm3。
3. the preparation method of a kind of dense media powder for water process according to claim 2, it is characterised in that：The step
Suddenly（2）In grinding step use ball mill or airflow mill；During from ball mill, from steel ball dry grinding, Ceramic Balls dry grinding or
The one kind in wet-milling is carried out as disperse means using distilled water or deionized water.
4. the preparation method of a kind of dense media powder for water process according to claim 2, it is characterised in that：The step
Suddenly（4）In baking operation, drying temperature be 90-100 DEG C, drying time is 1-3h.
5. the preparation method of a kind of dense media powder for water process according to claim 2, it is characterised in that：The step
Suddenly（5）In calcining process, oxygen concentration is set to 0.0%-4.5% during roasting, temperature rising-time is 1-3h, and sintering temperature is
600 DEG C -850 DEG C, roasting time is 3-4h.
6. the preparation method of a kind of dense media powder for water process according to claim 2, it is characterised in that：The step
Suddenly（6）In be cooled to the time used by normal temperature for 1-3h, oxygen concentration during cooling is set to oxygen concentration during roasting, carries out
Atmosphere protection；The step（6）Middle screening operation selects double-deck screening machine, for beyond the purpose of 300 mesh of Particle size requirements -200
Grain is separated.
7. the preparation method of a kind of dense media powder for water process according to claim 2, it is characterised in that：The step
Suddenly（6）In prilling use mist projection granulating, during granulation, slurry temperature is set to 40 DEG C -50 DEG C, add polyvinyl alcohol
（PVA）Or methylcellulose（CMC）As binder, particle of the diameter in the mesh of 50 mesh -200 is formed.
8. a kind of application method of the dense media powder for water process according to claim 1, it is characterised in that：Including with
Lower step：The pending raw water need to successively flow through mixing pit, primary flocculation basin, flocculation tank, sedimentation basin and milipore filter
Water outlet behind pond；
During pending raw water pumped into mixing pit, coagulant is added in mixing pit；Open mixer to be stirred, stirring speed
Rate is 200-350s-1, mixing time is 2-5min；So that coagulant is sufficiently mixed with pending raw water；
B. flow automatically after coagulant is sufficiently mixed with raw water and enter primary flocculation basin, dense media powder is added in primary flocculation basin；Open
Open mixer to be stirred, stir speed (S.S.) is 150-300s-1, mixing time is 2-6min；
C. the water gravity flow containing coagulant and dense media powder enters flocculation tank, and flocculation aid is added in flocculation tank, opens
Open mixer to be stirred, stir speed (S.S.) is 40-150s-1, mixing time is 2-6min；So that the sludge impurity in water progressively coagulates
It is polymerized to flco；
D. in flocculation tank the water gravity flow containing flco into being precipitated in sedimentation basin；
E. the clear water gravity flow on sedimentation basin upper strata enters ultrafiltration membrane pool, filtration treatment is carried out by milipore filter, further by disappearing
Poison treatment, forms drinking public water supply and dispatches from the factory；
F. the flco sediment for sedimentation basin bottom being contained into dense media powder pumps into cracking flossing machine, is beaten sludge flco using cracking flossing machine
It is broken so that sludge impurity is separated with dense media wadding core, and then, sludge, water of Xie Xuhou etc. enter dense media recycling machine, and utilize
Dense media powder seperator dense medium powder is reclaimed, and the dense media powder after recovery continues to participate in wadding in putting into primary flocculation basin
Solidifying reaction, realizes recycling for dense media powder.
9. the application method of a kind of dense media powder for water process according to claim 8, it is characterised in that：The step
The motor speed of cracking flossing machine is 900-3000r/min in rapid f；The magnetic induction intensity of the cylinder surface of the dense media recycling machine is
Magnetic flux ＞ 150mT.
10. the application method of a kind of dense media powder for water process according to claim 8, it is characterised in that：It is described
The addition of coagulant is 10-20mg/L in step a；The addition of dense media powder is 8-12mg/L in the step b；The step
The addition of flocculation aid is 0.1-0.2mg/L in rapid c.
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| CN109292921A (en) * | 2018-10-15 | 2019-02-01 | 太平洋水处理工程有限公司 | A kind of formula and application method of the dense media powder for water treatment |
| CN109317289A (en) * | 2018-11-14 | 2019-02-12 | 王光领 | Dry sand medium preparation process is used on air dry sand Recognition Applied in Coal Preparation System |
| CN113828392A (en) * | 2021-09-22 | 2021-12-24 | 江苏京源环保股份有限公司 | Integrated production device of composite magnetic medium for water treatment and use method thereof |
| CN115057509A (en) * | 2022-06-08 | 2022-09-16 | 华能陇东能源有限责任公司 | Seed crystal pretreatment method suitable for dense medium reinforced coagulation process |
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