CN110204028A - Handle gypsum rotating crystal device, processing method and the dihydrate gypsum of dilute sulfuric acid waste water - Google Patents
Handle gypsum rotating crystal device, processing method and the dihydrate gypsum of dilute sulfuric acid waste water Download PDFInfo
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- CN110204028A CN110204028A CN201910621602.1A CN201910621602A CN110204028A CN 110204028 A CN110204028 A CN 110204028A CN 201910621602 A CN201910621602 A CN 201910621602A CN 110204028 A CN110204028 A CN 110204028A
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- gypsum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0066—Stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—Treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses gypsum rotating crystal device, processing method and the dihydrate gypsums of processing dilute sulfuric acid waste water, gypsum rotating crystal device includes tank body and the agitating paddle with upper holder function, the first cylinder is provided in tank body, the second cylinder is arranged in first cylinder, one end of agitating paddle is set in the second cylinder, and the other end of agitating paddle runs through the tank body and stretching；It is opened up at the top of tank body there are two inlet, is provided with inlet tube in two inlets, gap is provided between inlet tube and inlet；Wherein, an inlet tube is connected to the second cylinder and another inlet tube is connected to the first cylinder；The bottom of tank body offers crystal grain outlet；The top of tank body offers multiple discharge outlet；Gypsum size of microcrystal is big, dirt easy to clean；The dihydrate gypsum that the processing method of dilute sulfuric acid waste water is also disclosed and obtains.
Description
Technical field
The invention belongs to dilute sulfuric acid technical field of waste water processing, and in particular to the gypsum rotating crystal device of processing dilute sulfuric acid waste water,
The dihydrate gypsum that the processing method of dilute sulfuric acid waste water and the processing method obtain.
Background technique
The waste water that mass fraction for sulfuric acid is 5%-25%, because the recovery value of sulfuric acid is not high, it is also difficult to comprehensive benefit
With usually being neutralized with lime and salkali waste, so that the sulfuric acid content in waste water is reached discharge standard or be conducive to subsequent place
Reason.It is at present most economical and feasible scheme with powdered whiting neutralisation treatment dilute sulfuric acid waste water, but this method is in chemistry
What gypsum crystallization reactor carried out, and there is easy fouling during handling dilute sulfuric acid waste water in chemical gypsum crystallization reactor
Blocking, the dirt gypsum product particle that is not easily cleaned and generates are tiny, which causes to settle, filter process with
And dehydration is difficult to carry out.
Summary of the invention
In order to solve the above problems existing in the present technology, the present invention provides a kind of gypsum for handling dilute sulfuric acid waste water to turn
Brilliant device.
The technical scheme adopted by the invention is as follows: a kind of gypsum rotating crystal device handling dilute sulfuric acid waste water, including tank body and tool
There is the agitating paddle of upper holder function, the first cylinder is provided in tank body, the second cylinder, one end of agitating paddle are arranged in the first cylinder
It is set in the second cylinder, the other end of agitating paddle runs through the tank body and stretching；
It is reactive crystallization area in second cylinder, the gap area between the second cylinder and the first cylinder is crystal form growth area,
Slit region between first cylinder and tank body is clarification overflow area；
It is opened up at the top of tank body there are two inlet, one of inlet is connected to the second cylinder, another inlet
It is connected to the first cylinder；The bottom of tank body offers crystal grain outlet；The top of tank body offers multiple discharge outlet.
The operation principle of the present invention is that: dilute sulfuric acid waste water and recirculated water enter the by the inlet being connected to the second cylinder
In two cylinders, the mixture of coarse whiting powder and crystal seed, the mixture of calcium carbonate slurry and crystal seed, coarse whiting powder or calcium carbonate slurry are from another
One inlet enters in crystal form growth area；
Reactive crystallization area provides place for the reaction of sulfuric acid and calcium carbonate, for tiny gypsum crystal grain grow up provide crystal form at
Long area, dilute sulfuric acid are passed through in reactive crystallization area, and calcium carbonate is passed through in crystal form growth area, in the case where frequency control motor starting
Agitating paddle is driven to rotate so that the material in reactive crystallization area and in crystal form growth area forms clockwise circulation, i.e. reactive crystallization
Material in area enters from below and flows out from top, and the material in crystal form growth area enters and flows out from below, shape from top
At bulky grain gypsum crystal grain fall to tank base under the action of self gravity and overflow water, react the water and circulation of generation
Water overflow is discharged to clarification overflow area and from discharge outlet；Reacting for sulfuric acid and calcium carbonate occurs in reactive crystallization area, obtains slightly soluble
In the calcium sulfate of water, main chemical reactions equation are as follows: CaCO3+H2SO4=CaSO4+CO2↑+H2O, MgCO3+H2SO4=MgSO4
+CO2↑+H2O。
The invention has the benefit that agitating paddle and frequency control motor, the tiny CaSO for enabling to reaction to generate4?
Grain enters crystal form growth area from reactive crystallization area and is covered on biggish gypsum particle, so that the partial size of gypsum particle is big,
It is not easy to plug in subsequent processes, is not likely to produce dirt and easily settled, successfully convenient for subsequent filtering and dehydration
It carries out.
Preferably, be fixedly connected with heating tube on the lateral wall of the tank body, heating tube along the tank body lateral wall
Snakelike distribution from top to bottom.
Heating tube is set, is passed through heat medium into heating tube so that the intracorporal temperature control of tank is at 50~100 DEG C
Between, the progress of reaction can not only be accelerated, and can use in winter with cold district, expand the gypsum rotating crystal device
Use scope.
Preferably, controlling valve is provided in the crystal grain outlet.
Preferably, one end that the agitating paddle stretches out the tank body is fixedly connected with frequency control motor.
Preferably, the lower end of second cylinder is set to the lower section of first cylinder lower end.
Preferably, it is set in the first cylinder at the top of second cylinder.
The present invention also provides a kind of processing methods of dilute sulfuric acid waste water, comprising the following steps:
S1: the molar ratio of the concentration of sulfuric acid in measurement dilute sulfuric acid waste water, sulfuric acid and coarse whiting is calculated according to 87~92:100
The mole and quality of required coarse whiting and coarse whiting powder is weighed, the grade of coarse whiting powder is 80~180 mesh or 120 mesh or more；
S2: starting frequency control motor, frequency control motor revolving speed are 500~1000rpm/min, are passed through and add in heating tube
Thermal medium, so that the temperature in gypsum rotating crystal device is controlled at 50~100 DEG C；
Dilute sulfuric acid waste water is passed through the reactive crystallization area of gypsum rotating crystal device with the speed of 1100~1400kg/h, coarse whiting powder with
100~200kg/h is passed through the crystal form growth area of gypsum rotating crystal device, and recirculated water is passed through into gypsum rotating crystal device, and quantity of circulating water is
900~2714L/h；
S3: it is opened at interval of one hour controlling valve by gypsum rotating crystal device bottom, collects the gypsum crystal grain of generation and filtering；
The gypsum crystal grain being obtained by filtration merged sample preparation and analysis at interval of two hours；The filtrate being obtained by filtration at interval of two hours into
Row combined analysis and survey its pH value；At interval of the pH value for the spilling water that half an hour detection is overflowed from discharge outlet.
The pH value of the working principle of the invention/the have the beneficial effect that overflow water that first, this method obtains 6.0~8.0 it
Between, reach the discharge standard of industry；The second, by-product gypsum crystal grain is obtained, which is dihydrate gypsum, the dihydrate gypsum
Average grain diameter be greater than 0.1mm, be far longer than 30-60 μm in the prior art, be conducive to infall process, filter process and de-
Water process is gone on smoothly；The mass fraction of the attached water of gypsum grain surface is far smaller than in the prior art less than 25%
35%-45%；Gypsum crystal grain purity is greater than 85%, is higher than 75%-85% in the prior art；The gypsum that this method prepares
The stability of crystal grain is good, can be used directly by the dihydrate gypsum that subsequent filtering and dehydration obtain, does not need secondary heap
It puts, avoids the secondary pollution stacked and bring environment.
Preferably, it is first mixed with water before the crystal form for being passed through gypsum rotating crystal device grows up area and is tuned by the coarse whiting powder
Calcium carbonate slurry.
The working principle of the invention/have the beneficial effect that so that the process that feeds is uniform and stable.
Preferably, crystal seed is added in Xiang Suoshu calcium carbonate slurry.
The working principle of the invention/have the beneficial effect that crystal seed has inducing action to the formation of gypsum crystal grain, is conducive to stone
The quick formation of cream crystal grain shortens the processing time of dilute sulfuric acid waste water.
The present invention also provides a kind of dihydrate gypsums that processing dilute sulfuric acid waste water obtains.
Detailed description of the invention
Fig. 1 is sectional view of the present invention along the axial direction of tank body；
In figure: 1- tank body；The second inlet tube of 2-；The first cylinder of 3-；The second cylinder of 4-；5- heating tube；6- overflow pipe；7-
Agitating paddle；8- frequency control motor；9- controlling valve；The first inlet tube of 10-；11- crystal grain delivery line.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further elaborated.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
In description of the invention, what some structures or device were not described specifically, it is interpreted as being able to achieve in the prior art
Structure or device.
Control group 1
A kind of processing method of dilute sulfuric acid waste water, comprising the following steps:
S1: the concentration of dilute sulfuric acid waste water to be treated, mass concentration 10% are measured；The molar ratio of sulfuric acid and coarse whiting
For 80:100, the amount of coarse whiting powder required for 1L dilute sulfuric acid waste water is calculated, coarse whiting powder is the mixing that grade is 80~120 mesh
Object；
S2: heat medium will be passed through in heating tube 5, heat medium can be afterheat steam or conduction oil, so that in tank body 1
Temperature be maintained at 35 DEG C, start frequency control motor 8 and its revolving speed be adjusted to 450rpm/min；By dilute sulfuric acid waste water with
The speed of 1000kg/h is passed through in the reactive crystallization area of gypsum rotating crystal device；
Coarse whiting powder is passed through the crystal form growth area of gypsum rotating crystal device with 80kg/h, and circulation is passed through into gypsum rotating crystal device
Water, quantity of circulating water 640L/h；
S3: it is opened at interval of one hour controlling valve by gypsum rotating crystal device bottom, collects the gypsum crystal grain of generation and filtering；
The gypsum crystal grain being obtained by filtration merged sample preparation and analysis at interval of two hours, and the results are shown in Table 1 for analysis；It is obtained by filtration
Filtrate is at interval of analysis is merged in two hours and surveys its pH value；The spilling water overflowed from discharge outlet is detected at interval of half an hour
PH value, the results are shown in Table 1.
Control group 2
A kind of processing method of dilute sulfuric acid waste water, comprising the following steps:
S1: the concentration of dilute sulfuric acid waste water to be treated, mass concentration 10% are measured；The molar ratio of sulfuric acid and coarse whiting
For 100:100, the amount of coarse whiting powder required for 1L dilute sulfuric acid waste water is calculated, coarse whiting powder is the mixing that grade is 60~80 mesh
Object；
S2: heat medium will be passed through in heating tube 5, heat medium can be afterheat steam or conduction oil, so that in tank body 1
Temperature be maintained at 110 DEG C, start frequency control motor 8 and its revolving speed be adjusted to 201rpm/min；By dilute sulfuric acid waste water with
The speed of 1520kg/h is passed through in the reactive crystallization area of gypsum rotating crystal device, coarse whiting powder and water reconciled so that coarse whiting content
10% and 40Kg crystal seed being added simultaneously to form calcium carbonate slurry, calcium carbonate slurry with 135kg/h be passed through the crystal form of gypsum rotating crystal device at
Long area, and recirculated water is passed through into gypsum rotating crystal device, quantity of circulating water 2964L/h；
S3: it is opened at interval of one hour controlling valve by gypsum rotating crystal device bottom, collects the gypsum crystal grain of generation and filtering；
The gypsum crystal grain being obtained by filtration merged sample preparation and analysis at interval of two hours, and the results are shown in Table 1 for analysis；It is obtained by filtration
Filtrate is at interval of analysis is merged in two hours and surveys its pH value；The spilling water overflowed from discharge outlet is detected at interval of half an hour
PH value, the results are shown in Table 1.
Embodiment 1
A kind of processing method of dilute sulfuric acid waste water, comprising the following steps:
S1: the concentration of dilute sulfuric acid waste water to be treated, mass concentration 10% are measured；The molar ratio of sulfuric acid and coarse whiting
For 87:100, the amount of coarse whiting powder required for 1L dilute sulfuric acid waste water is calculated, coarse whiting powder is the mixing that grade is 80~180 mesh
Object；
S2: heat medium will be passed through in heating tube 5, heat medium can be afterheat steam or conduction oil, so that in tank body 1
Temperature be maintained at 50 DEG C, start frequency control motor 8 and its revolving speed be adjusted to 500rpm/min；By dilute sulfuric acid waste water with
The speed of 1100kg/h is passed through in the reactive crystallization area of gypsum rotating crystal device, coarse whiting powder and water reconciled so that coarse whiting content
For 10% and simultaneously be added 40kg crystal seed formed calcium carbonate slurry；
Calcium carbonate slurry is passed through the crystal form growth area of gypsum rotating crystal device with 100kg/h, and circulation is passed through into gypsum rotating crystal device
Water, quantity of circulating water 900L/h；
S3: it is opened at interval of one hour controlling valve by gypsum rotating crystal device bottom, collects the gypsum crystal grain of generation and filtering；
The gypsum crystal grain being obtained by filtration merged sample preparation and analysis at interval of two hours, and the results are shown in Table 1 for analysis；It is obtained by filtration
Filtrate is at interval of analysis is merged in two hours and surveys its pH value；The spilling water overflowed from discharge outlet is detected at interval of half an hour
PH value, the results are shown in Table 1.
Embodiment 2
A kind of processing method of dilute sulfuric acid waste water, comprising the following steps:
S1: the concentration of dilute sulfuric acid waste water to be treated, mass concentration 10% are measured；The molar ratio of sulfuric acid and coarse whiting
For 89:100, the amount of coarse whiting powder required for 1L dilute sulfuric acid waste water is calculated, coarse whiting powder is the mixing that grade is 120 mesh or more
Object；
S2: heat medium will be passed through in heating tube 5, heat medium can be afterheat steam or conduction oil, so that in tank body 1
Temperature be maintained at 76 DEG C, start frequency control motor 8 and its revolving speed be adjusted to 751rpm/min；By dilute sulfuric acid waste water with
The speed of 1300kg/h is passed through in the reactive crystallization area of gypsum rotating crystal device, coarse whiting powder and water reconciled so that coarse whiting content
For 10% and simultaneously be added 40kg crystal seed formed calcium carbonate slurry；
Calcium carbonate slurry is passed through the crystal form growth area of gypsum rotating crystal device with 110kg/h, and circulation is passed through into gypsum rotating crystal device
Water, quantity of circulating water 1549L/h；
S3: it is opened at interval of one hour controlling valve by gypsum rotating crystal device bottom, collects the gypsum crystal grain of generation and filtering；
The gypsum crystal grain being obtained by filtration merged sample preparation and analysis at interval of two hours, and the results are shown in Table 1 for analysis；It is obtained by filtration
Filtrate is at interval of analysis is merged in two hours and surveys its pH value；The spilling water overflowed from discharge outlet is detected at interval of half an hour
PH value, the results are shown in Table 1.
Embodiment 3
A kind of processing method of dilute sulfuric acid waste water, comprising the following steps:
S1: the concentration of dilute sulfuric acid waste water to be treated, mass concentration 10% are measured；The molar ratio of sulfuric acid and coarse whiting
For 92:100, the amount of coarse whiting powder required for 1L dilute sulfuric acid waste water is calculated, coarse whiting powder is that grade is the mixing of 120 object above
Object；
S2: heat medium will be passed through in heating tube 5, heat medium can be afterheat steam or conduction oil, so that in tank body 1
Temperature be maintained at 100 DEG C, start frequency control motor 8 and its revolving speed be adjusted to 1000rpm/min；By dilute sulfuric acid waste water with
The speed of 1400kg/h is passed through in the reactive crystallization area of gypsum rotating crystal device, coarse whiting powder and water reconciled so that coarse whiting content
For 10% and simultaneously be added 40kg crystal seed formed calcium carbonate slurry；
Calcium carbonate slurry is passed through the crystal form growth area of gypsum rotating crystal device with 200kg/h, and circulation is passed through into gypsum rotating crystal device
Water, quantity of circulating water 2714L/h；
S3: it is opened at interval of one hour controlling valve by gypsum rotating crystal device bottom, collects the gypsum crystal grain of generation and filtering；
The gypsum crystal grain being obtained by filtration, i.e. dihydrate gypsum merged sample preparation and analysis at interval of two hours, analyze result such as 1 institute of table
Show；The filtrate being obtained by filtration is at interval of analysis is merged in two hours and surveys its pH value；It detects at interval of half an hour from discharge outlet
The pH value of the spilling water of spilling, the results are shown in Table 1.
The analysis result of 1. dihydrate gypsum of table and overflow water
As shown in Table 1, the purity of 1 gained dihydrate gypsum of control group is lower than 85%, and the dihydrate gypsum directly used is not achieved
Requirement；Although the purity of 2 gained dihydrate gypsum of control group is greater than 85%, the pH value of overflow water is 1.36, is highly acid,
The standard of industrial direct emission is not achieved；By embodiment 1-3 it is found that when the molar ratio of sulfuric acid and coarse whiting is 87-92:100, again
The grade of calcium powder is 80~120 mesh or 120 mesh or more, the intracorporal temperature of tank is 50~100 DEG C, mixing speed be 500~
1000rpm/min, dilute sulfuric acid waste water are passed through the intracorporal speed of tank and are passed through the intracorporal speed of tank for 1100~1400kg/h, coarse whiting powder
When degree is 100~120kg/h and quantity of circulating water is 900~2714L/h, the purity of obtained by-product dihydrate gypsum is greater than
85%, the pH value of overflow water meets the standard of industrial direct emission between 6.0~8.0.
Embodiment 4
The example of the present embodiment is shown in the accompanying drawings, and in which the same or similar labels are throughly indicated same or like
Element or element with the same or similar functions.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to
It is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
In description of the invention, what some structures or device were not described specifically, it is interpreted as being able to achieve in the prior art
Structure or device.
The technical solution of the present embodiment are as follows: it is a kind of handle dilute sulfuric acid waste water gypsum rotating crystal device, including tank body 1 and have it is upper
The agitating paddle 7 of holder function is provided with the first cylinder 3 in tank body 1, is arranged with the second cylinder 4 in the first cylinder 3, and the one of agitating paddle 7
End is set in the second cylinder 4, and the other end of agitating paddle 7 through the tank body 1 and stretches out；
It is reactive crystallization area in second cylinder 4, the gap area between the second cylinder 4 and the first cylinder 3 is crystal form growth
Area, the slit region between the first cylinder 3 and tank body 1 are clarification overflow area；
The top of tank body 1 is opened up there are two inlet, is provided with inlet tube, inlet tube and inlet in two inlets
Between be provided with gap；Wherein, an inlet tube is connected to the second cylinder 4 and another inlet tube is connected to the first cylinder 3；Tank
The bottom of body 1 offers crystal grain outlet；The top of tank body 1 offers multiple discharge outlet.
It is fixedly connected with heating tube 5 on the lateral wall of the tank body 1, heating tube 5 is along the lateral wall of the tank body 1 from upper
Arrive down snakelike distribution.
Controlling valve 9 is provided in the crystal grain outlet 13.One end that the agitating paddle 7 stretches out the tank body 1 is fixedly connected
There is frequency control motor 8.The lower end of second cylinder 4 is set to the lower section of 3 lower end of the first cylinder.Second cylinder
4 top is set in the first cylinder 3.
As shown in Figure 1, agitating paddle 7 is made of stirring rod and paddle, one end of stirring rod is defeated with frequency control motor 8
Shaft is connected by bearing, and paddle uses the helical-blade with upper holder function to be made, and paddle is along 7 central axis direction of agitating paddle
It is distributed on the outer surface of agitating paddle 7；One inlet is connected to the second cylinder 4 by the first inlet tube 10；Another feed liquor
Mouth is connected to the first cylinder 3 by the second inlet tube 2；Overflow pipe 6 is communicated in each discharge outlet, overflow pipe 6 is arranged
In the outside of tank body 1, the lower end of overflow pipe 6 extends to the bottom of tank body 1.
Due to as the temperature rises, the speed for generating gypsum crystal grain is accelerated, therefore heating tube 5 is arranged and to heating tube 5
The temperature being inside passed through in heat medium promotion gypsum rotating crystal device, accelerates the generation of gypsum crystal grain, substantially reduces dilute sulfuric acid waste water
The processing time；And the gypsum rotating crystal device can be also used for adapting to the use in winter and cold district, expand the scope of application.
Start frequency control motor 8, frequency control motor 8 includes speed reducer and motor, the revolving speed control of frequency control motor 8
System is in 500-1000 revs/min；Drive agitating paddle 7 around itself axis rotate, due to agitating paddle 7 paddle rotation process
In the substance of its underpart can be driven and move up, therefore the liquid of 4 lower part of the second cylinder can enter in the second cylinder 4 and edge
The second cylinder 4 move up, finally come out and enter in the first cylinder 3 (i.e. crystal form growth area) from the top of the second cylinder 4；Sulphur
The waste water and recirculated water that acid mass fraction is 5%~25% are imported in the second cylinder 4 by the first inlet tube 10, crystal seed and coarse whiting slurry
Material is imported in the first cylinder 3 by the second inlet tube 2, sulfuric acid and carrys out the calcium carbonate slurry to 4 bottom of the second cylinder in reactive crystallization area
It interior contact and reacts, specifically reaction equation are as follows: CaCO3+H2SO4=CaSO4+CO2↑+H2O, MgCO3+H2SO4=
MgSO4+CO2↑+H2O reacts gap of the carbon dioxide gas of generation between two inlets and two inlet tubes and overflows, from
And the intracorporal pressure of tank is maintained in reasonable range, the solid product of generation is reacted as the rotation of agitating paddle 7 is upward
It moves and enters in crystal form growth area, calcium sulfate, which is covered on the surface of crystal seed, forms nucleus, brilliant with the continuous progress of reaction
Core surface constantly covers calcium sulfate and forms gypsum crystal grain, and it is increasing that gypsum grain surface continues attachment calcium sulfate formation partial size
The weight of gypsum crystal grain and gypsum crystal grain is also increasingly heavier, and after the partial size of gypsum crystal grain is more than certain value, gypsum crystal grain can be
Self gravity and overflow water (general designation of the water and recirculated water that generate for reaction) decline under the action of shunting and fall to tank body 1
Bottom；The small gypsum crystal grain of partial size follows calcium carbonate slurry to enter reactive crystallization area from 4 bottom of the second cylinder and carries out, subsequently into crystalline substance
Type grows up in area attachment calcium sulfate so that the partial size of gypsum crystal grain increases, so circulation, until the partial size of gypsum crystal grain surpasses
It crosses after certain value, gypsum crystal grain declines and fall to the bottom of tank body 1 under the action of self gravity and overflow water shunt；With
Waste water, the addition of calcium carbonate slurry and recirculated water and the continuous progress of reaction, the liquid level in tank body 1 gradually rise and react
The water and recirculated water of generation overflow to tank body 1 by the region of wall and enter clarification overflow area, when the liquid level in clarification overflow area reaches
When to discharge outlet, overflow water overflows and is guided to corresponding waste water receiving area by overflow pipe 6；When the gypsum of 1 bottom of tank body
After crystal grain is accumulated to certain altitude, controlling valve 9 is opened, gypsum crystal grain is exported by crystal grain delivery line 11, and controlling valve 9 can be by existing
Some PLC control systems, which are realized, to automatically turn on or closes.
100 gypsum crystal grain that the gypsum rotating crystal device is prepared are detected, the average grain diameter of gypsum crystal grain is obtained
Greater than 0.1mm, it is much larger than 30~60 μm in the prior art.
The partial size for the gypsum crystal grain being prepared by the gypsum rotating crystal device is big, is easy sedimentation, is convenient for subsequent machining technology
Go on smoothly, such as filter process and dehydration；Since the substance in reactive crystallization area and crystal form growth area is always to be in
The state moved up or down, therefore calcium carbonate slurry and stone are adhered on the wall of the second cylinder 4 and on the wall of the first cylinder 3
The amount of cream crystal grain is few, and the gypsum crystal grain for reaching certain partial size is directly settled down under the action of itself gravity and overflow water shunt
The bottom of tank body 1 will not block the gypsum rotating crystal device；The water overflow generated in reaction process enters clarification overflow area and reaction knot
Crystalline region, crystal form growth area and clarification overflow area are straight tube structures, are conducive to the cleaning of later period dirt.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is all to fall into the claims in the present invention confining spectrum
Technical solution, be within the scope of the present invention.
Claims (10)
1. a kind of gypsum rotating crystal device for handling dilute sulfuric acid waste water, which is characterized in that including tank body (1) and stirring with upper holder function
It mixes paddle (7), is provided with the first cylinder (3) in tank body (1), is arranged with the second cylinder (4) in the first cylinder (3), agitating paddle (7)
One end is set in the second cylinder (4), and the other end of agitating paddle (7) through the tank body (1) and stretches out；
Be reactive crystallization area in second cylinder (4), the gap area between the second cylinder (4) and the first cylinder (3) for crystal form at
Long area, the slit region between the first cylinder (3) and tank body (1) are clarification overflow area；
Opened up at the top of tank body (1) there are two inlet, be provided with inlet tube in two inlets, inlet tube and inlet it
Between be provided with gap；Wherein, an inlet tube is connected to the second cylinder (4) and another inlet tube is connected to the first cylinder (3)；
The bottom of tank body (1) offers crystal grain outlet；The top of tank body (1) offers multiple discharge outlet.
2. gypsum rotating crystal device according to claim 1, which is characterized in that be fixedly connected on the lateral wall of the tank body (1)
Have heating tube (5), heating tube (5) along the tank body (1) lateral wall snakelike distribution from top to bottom.
3. gypsum rotating crystal device according to claim 1, which is characterized in that be provided with controlling valve (9) in the crystal grain outlet.
4. gypsum rotating crystal device according to claim 1-3, which is characterized in that described in the agitating paddle (7) is stretched out
One end of tank body (1) is fixedly connected with frequency control motor (8).
5. gypsum rotating crystal device according to claim 4, which is characterized in that the lower end of second cylinder (4) is set to institute
State the lower section of the first cylinder (3) lower end.
6. gypsum rotating crystal device according to claim 1 or 2, which is characterized in that be set at the top of second cylinder (4)
In first cylinder (3).
7. a kind of processing method of dilute sulfuric acid waste water, which comprises the following steps:
S1: needed for the molar ratio of the concentration of sulfuric acid in measurement dilute sulfuric acid waste water, sulfuric acid and coarse whiting is calculated according to 87~92:100
The mole and quality of coarse whiting and coarse whiting powder is weighed, the grade of coarse whiting powder is 80~180 mesh or 120 mesh or more；
S2: starting frequency control motor, frequency control motor revolving speed are 500~1000rpm/min, and heating is passed through in heating tube and is situated between
Matter, so that the temperature in gypsum rotating crystal device is controlled at 50~100 DEG C；
Dilute sulfuric acid waste water is passed through the reactive crystallization area of gypsum rotating crystal device with the speed of 1100~1400kg/h, and coarse whiting powder is with 100
~200kg/h is passed through the crystal form growth area of gypsum rotating crystal device, and recirculated water is passed through into gypsum rotating crystal device, quantity of circulating water 900
~2714L/h；
S3: it is opened at interval of one hour controlling valve by gypsum rotating crystal device bottom, collects the gypsum crystal grain of generation and filtering；Filtering
Obtained gypsum crystal grain merged sample preparation and analysis at interval of two hours；The filtrate being obtained by filtration was closed at interval of two hours
And it analyzes and surveys its pH value；At interval of the pH value for the spilling water that half an hour detection is overflowed from discharge outlet.
8. processing method according to claim 1, which is characterized in that the coarse whiting powder is in the crystalline substance for being passed through gypsum rotating crystal device
First it is mixed with water before type growth area and is tuned into calcium carbonate slurry.
9. processing method according to claim 8, which is characterized in that crystal seed is added in Xiang Suoshu calcium carbonate slurry.
10. a kind of dihydrate gypsum that the processing method of dilute sulfuric acid waste water as claimed in any one of claims 7-9 is handled.
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| CN102580346A (en) * | 2012-03-02 | 2012-07-18 | 浙江金科日化原料有限公司 | Continuous crystalizer |
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| CN105858692A (en) * | 2016-05-13 | 2016-08-17 | 国家海洋局天津海水淡化与综合利用研究所 | Method for treating magnesium sulfate and magnesium sulfite wastewater by virtue of lime method |
| CN109847683A (en) * | 2019-02-27 | 2019-06-07 | 中机国际工程设计研究院有限责任公司 | Reaction kettle is used in ternary anode material precursor preparation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2485020Y (en) * | 2001-05-24 | 2002-04-10 | 化学工业部连云港设计研究院 | Salt chemical reactor |
| JP2006122896A (en) * | 2004-09-28 | 2006-05-18 | Mitsubishi Materials Corp | Method of treatment with reactional crystallization and apparatus therefor |
| CN102030354A (en) * | 2010-10-18 | 2011-04-27 | 中蓝连海设计研究院 | Treatment method of waste sulfuric acid |
| CN102580346A (en) * | 2012-03-02 | 2012-07-18 | 浙江金科日化原料有限公司 | Continuous crystalizer |
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Application publication date: 20190906 |