CN106219652A - High concentration salt manufacturing salt air-flotation treatment method - Google Patents
High concentration salt manufacturing salt air-flotation treatment method Download PDFInfo
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- CN106219652A CN106219652A CN201610755639.XA CN201610755639A CN106219652A CN 106219652 A CN106219652 A CN 106219652A CN 201610755639 A CN201610755639 A CN 201610755639A CN 106219652 A CN106219652 A CN 106219652A
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
- C02F2303/00—Specific treatment goals
- C02F2303/12—Prevention of foaming
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention belongs to salt manufacturing brine treatment field, be specifically related to a kind of high concentration salt manufacturing salt air-flotation treatment method, including four steps: 1) the water inlet dosing stage；2) the coagulation stage；3) the air supporting stage；4) slag, froth breaking stage are scraped；Described step 3) in flotation tank contact area be provided with micro-hole aerator, micro-hole aerator aperture≤0.1 μm, aeration intensity 1 3Nm3/(m2/ h), aeration zone flow rate of water flow 5 9m/h, time of contact 11 20min；After air supporting has contacted, entering flotation separation zone, disengaging time 40 75min, scum silica frost is collected after floating and is entered scum trough, and the salt after process enters air supporting clear water zone；In clear water zone, salt exits into product pond by overfall；The high concentration pneumatically supported processing method of salt manufacturing salt of the present invention, it is possible to make the floating particle water particle diameter that produces effectively be removed in 1 to 1.5 μm, a large amount of colloids, suspended contaminant.The air-flotation treatment method that the present invention uses will not reduce salt manufacturing salt salinity.
Description
Technical field
The invention belongs to salt manufacturing brine treatment field, be specifically related to a kind of high concentration salt manufacturing salt air-flotation treatment method.
Background technology
Containing abundant chemical resource in salt, salinity is up to 2-6 times of sea water, can be effective by salt air-flotation process
Removing in salt the impurity such as float colloid, reduce colourity, producing water carries out steaming salt again, will be greatly improved product salt quality.
Air-flotation treatment method has good separating effect for the float being difficult to natural subsidence in liquid phase, in many industries
Water process in be widely applied.Air-flotation treatment method is the micro-bubble forming high degree of dispersion in water, adheres in water
The solid of hydrophobic group or liquid particles, form water-gas-granule three-phase mixed system, after particle adhesion bubble, forms apparent density
Float to the water surface less than the flco of water, form scum layer and be stripped off, thus realize the process of solid-liquid or Liquid liquid Separation.
According to producing, bubble mode is unusual is divided into gas distribution air supporting, electrofloatation, air-dissolving air-float etc. to air flotation technology.Wherein
Micropore gas distribution, dispersion air air supporting belong to gas distribution air supporting, are the air flotation technology of relatively early application: be characterized in the bottom at flotation tank
Microporous diffuser or diffuser plate, anemostat are set, compressed air from bubbler or plate face, pipe face with micro-bubble form escape in
In water.
Currently used most commonly used be method of pressed dissolved-air release.Its operation principle is: air pressurized is dissolved in water and reached
Saturated, the gas being dissolved in water when entering flotation tank after dissolved air water decompression escapes from water, i.e. disengages microbubble, claims to add pressure solution
Gas method.Pressure air-dissolving water can be all or part of of handled water, it is also possible to is the recirculation water of flotation tank water outlet.Add pressure solution
The equipment of gas method has force (forcing) pump, dissolving and air compressor etc..Dissolving is pressure-bearing steel cylinder, and internal setting up is put deflector or put
Put filler.Dissolving water outlet enters flotation tank by air relief valve or release.Shallow air-floatation is the another way of air-dissolving air-float,
Currently used the most widely, its device integrates cohesion, air supporting, skimming, precipitates, scrapes mud, and overall in cylinder, pond is relatively
Shallow, for proportion close to the removal of the small particle of water, it is one of most efficient method.
In existing air-float technology, partial reflux pressurized dissolved air flotation, shallow air-floatation are most widely used, and technical characterstic is distinct,
Advantages, application experience is enriched, but is applied in High Concentration Brine exist open defect.In salt manufacturing salt, work as halogen
When water Baume degrees is less than 10 ° of B é, release produces microbubble still can meet the needs of air-float technology；But when salt Baume degrees increases
During to actual salt manufacturing 18-24 ° of B é of salt Baume degrees, release produces microbubble drastically to be reduced, it is impossible to meet the need of air-float technology
Want.Tracing it to its cause and be probably in Baume degrees is 18-24 ° of B é high concentration salt manufacturing brine systems, gas-liquid system surface free energy is rapid
So raising, system cannot resist the trend that spontaneous energy itself reduces simultaneously, and its gas core self-energy is not more than Δ F, and (air pocket becomes
Nuclear energy is built), molecular state dissolved gas can not be with the form precipitation of gas core from liquid phase.
Meanwhile, relating to device, pipe fitting more in pressurized dissolved air flotation, shallow air-floatation technique, salt manufacturing Brine salinity is big, right
Water pump, pipeline salt tolerant be corrosion-resistant to be required high, is applied directly in salt manufacturing brine treatment to increase cost.And conventional diffusion plate,
The produced bubble size of air supporting mode of the direct gas distribution of anemostat is relatively big, and energy consumption waste is big, and direct application then cannot meet place
Reason requirement.
Summary of the invention
It is an object of the invention to overcome the air-flotation treatment method of prior art to be difficult to process the salt manufacturing salt of high concentration
Defect, it is provided that a kind of high concentration salt manufacturing salt air-flotation treatment method.
For realizing the purpose of the present invention, the technical scheme used is:
A kind of high concentration pneumatically supported processing method of salt manufacturing salt, comprises the steps:
1) the water inlet dosing stage: by the salt manufacturing salt that Baume degrees is 18-24 ° of B é, entered by water inlet pipe through water pump lifting
Coagulation district, coagulant adds coagulation district by dosing pump simultaneously；
2) the coagulation stage: salt carries out coagulation stirring in coagulation district after mixing with medicament；Utilize the coagulation stage can be by salt manufacturing
In salt, float, colloid etc. are de-surely, be gathered into flocculate, and water outlet enters flotation tank contact area.
3) the air supporting stage: the water outlet of coagulation district enters flotation tank contact area, and described flotation tank contact area is provided with micro-pore aeration
Device, micro-hole aerator aperture≤0.1 μm, aeration intensity 1-3Nm3/(m2/ h), aeration zone flow rate of water flow 5-9m/h, time of contact
11-20min；After air supporting has contacted, entering flotation separation zone, disengaging time 40-75min, scum silica frost is collected to enter after floating and is floated
Slag chute, the salt after process enters air supporting clear water zone；In clear water zone, salt exits into product pond by overfall；
4) scrape slag, froth breaking stage: producing scum silica frost and use automatic control transmission slag-scraper to scrape scum trough, scum period is for starting
45s, stops 10min, and scum silica frost is flow to scum silica frost bucket certainly by dreg scraping trough.
Preferably, described coagulant is aluminium polychlorid, and described coagulant is aluminium polychlorid, described coagulant
Consumption be: 0-50ppm；
Preferably, when described dosage of PAC is zero, i.e. when this technology produces for food salt, in technological process
Requirement is forbidden adding chemical agent, and in the case of this, chemical feeding quantity is 0ppm.Now, step 1) in high concentration salt manufacturing salt without
Step 2) in the coagulation stage, and be directly entered step 3) the air supporting stage, i.e. described high concentration salt manufacturing salt is directly entered gas
Fu Chi contact area, other steps are identical.
When being added with coagulant, it is preferred that described step 2) in, the coagulation stage is divided into level Four, one-level flocculation at a high speed
District rotating speed 200-600r/min, time of staying 30-80s, two grades of flocculation zone rotating speed 40-60r/min, time of staying 240-420s,
Three grades of flocculation zone rotating speed 10-30r/min, time of staying 240-420s, level Four flocculation zone rotating speed 10-30r/min, the time of staying
240-420s。
Step 4) in bubble in scum silica frost utilize shower to carry out spraying debubbling method effectively to eliminate, shower water is originated
In scum silica frost collecting pit supernatant.Described shower is provided with multiple aperture, and the aperture of described aperture is less than 1mm.
It is provided with cleaning pump on described micro-hole aerator top.
Step 1) in the temperature of high concentration salt manufacturing salt be 25-35 DEG C.
The bottom of described flotation tank contact area is provided with micro-hole aerator, and the water outlet in coagulation district is by the end of flotation tank contact area
Portion enters flotation tank contact area.
Described micro-hole aerator for organize aeration unit more, and described aeration unit includes the center connected with supply air line
Pipe and the arm being provided with aeration head connected with described central canal.
Compared with prior art, the invention has the beneficial effects as follows:
Owing to salt manufacturing halogen impurities in water is more, particularly with float such as colloids, tradition sand filtration, sedimentation is shone on beach cannot
Colloidal impurity is effectively treated.The invention air flotation technology is applied to high concentration salt manufacturing brine treatment, for
The problems such as high salinity Brine salinity is high, big, the pressure air-dissolving weak effect of viscosity, the aperture to micro-hole aerator, and aeration intensity,
Aeration zone flow rate of water flow, time of contact etc., condition effectively selected.The micro-hole aerator using micropore≤0.1 μm is carried out point
Spreading gas, produce micro-bubble works very well, flco, float in effective adhesion, removal salt manufacturing salt, at High Concentration Brine
Under environment, air flotation effect is far superior to pressurized dissolved air flotation.Salt colourity after process substantially reduces, colourity≤25, for follow-up deeply
Degree processes and lightens the load, and meanwhile, the distribution of salt particle diameter changes, and former water particle footpath is substantially in 1 to 10 μm, and air supporting is produced particle water particle diameter and existed
1 to 1.5 μm, a large amount of colloids, suspended contaminant are effectively removed.The air-flotation treatment method that the present invention uses will not reduce salt manufacturing
Salt salinity.
Preferred as one therein, when this technology produces for food salt, technological process requires forbid interpolationization
Learning medicament, now the addition of coagulant is zero.Also the salt colourity that can reach substantially reduces, and the distribution of salt particle diameter significantly subtracts
Few purpose.
Additionally, the present invention is for the coagulant in coagulation stage and mixing speed, and the water inlet temperature of high concentration salt manufacturing salt
The selection that degree is optimized, the effect making air supporting roguing is more excellent.
Micro-hole aerator is arranged on the bottom of flotation tank contact area simultaneously, is simultaneously provided with multiple aeration head, can increase exposure
Gas effect.The water outlet in coagulation district is entered flotation tank contact area by the bottom of flotation tank contact area, and floccule exposes with the micropore of bottom
The micro-bubble that gas device produces contacts more fully, increases aeration effect.
The present invention uses micro-hole aerator to disperse gas distribution air supporting method, compares pressurized dissolved air flotation, shallow air-floatation etc. and saves back
Stream pump, pipe fitting and valve etc., it is to avoid equipment is easily by problems such as high salinity salt corrosion.
The present invention uses spraying technique to carry out scum silica frost froth breaking.Due to the characteristics such as salt manufacturing brine viscosities is high, surface tension is big, pole
Easy to foaming, scum layer can assemble a large amount of bubble, and impact is normal to be used, it is therefore desirable to carry out defoaming treatment.Spray froth breaking hydromining
With supernatant in scum silica frost collecting pit, the most additionally using fresh water, orifice size≤1mm on shower, defoaming effect is good.This patent skill
Art recycles supernatant in scum silica frost collecting pit, and circulation carries out scum trough froth breaking, improves Brine resources utilization rate.
Accompanying drawing explanation
Fig. 1 is the structural representation of the air-flotation process system of the present invention.
In figure: 1, manually-operated gate before intake pump；2, intake pump；3, water inlet manually-operated gate；4, feed water flow gauge；5, dosing
Tank；6, dosing pump；7, medicine effusion meter is entered；8, coagulation agitating device；9, coagulation district；10, aeration pump；11, inlet air flow gauge；12、
Micro-hole aerator；13, aeration zone evacuation port；14, aerator cleans pump；15, contact zone of dissolved air flotation；16, flotation separation zone 17, scrape mud
Device；18, scum trough；19, scum silica frost collecting pit；20, scum silica frost froth breaking intake pump；21, scum silica frost froth breaking feed water flow gauge；22, overflow
Mouthful；23, air supporting clear water zone；24, is produced from pond；25, scum silica frost froth breaking shower.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that, technical scheme, Fig. 1 illustrate a kind of air supporting
The structural representation of processing system, concrete air-flotation system operational process:
Embodiment 1: when this technology produces for food salt, requires in technological process to forbid adding chemical agent, these feelings
Under condition, the chemical feeding quantity of coagulant is 0ppm.
1) fill phase: open manually-operated gate 1 before intake pump, by the high concentration salt manufacturing salt temperature that Baume degrees is 18-24 ° of B é
Degree is heated to 25-35 DEG C of its subject range, subsequently into intake pump 2, opens water inlet manually-operated gate 3 and makes salt manufacturing salt enter gas
Floating contact area 15, feed water flow gauge 4 monitors flow of inlet water simultaneously.
2) the air supporting stage: opening aeration pump 10 and inlet air flow gauge 11 monitors aeration rate, aeration passes through micro-hole aerator
12 enter salt, and wherein micro-hole aerator for organize aeration unit more, during described aeration unit includes connecting with supply air line
Heart pipe and the arm being provided with aeration head connected with described central canal.Described micro-hole aerator is arranged on flotation tank contact
The bottom in district, the water outlet in coagulation district is entered flotation tank contact area by the bottom of flotation tank contact area.Being equal to of the aperture of aeration head
0.1 μm, aeration intensity 1Nm3/(m2/ h), aeration zone flow rate of water flow 5m/h, time of contact 11min；A large amount of bubbles enter flotation tank
By flco band to water surface, after air supporting has contacted, enter flotation separation zone 16.Air-flotation system produces water by air supporting clear water zone 23
Overfall 22, enter produce pond 24.
4) scrape slag, froth breaking stage: open mud-scraping apparatus 17, arrange its cycle be start 45s, stop 10min, by scrape mud fill
Water surface top layer scum silica frost is scraped to scum trough 18 by the scraper plate installed, and scum silica frost liquid portion, from flowing to scum silica frost collecting pit 19, is opened
Scum silica frost froth breaking intake pump 20, scum silica frost froth breaking feed water flow gauge 21 monitors scum silica frost collecting pit to scum trough shower inflow, scum silica frost
Froth breaking shower 25 lower end has and some is smaller in size than 1mm hole, utilizes spray froth breaking to be eliminated by bubble in scum trough by shower.
Micro-hole aerator routine cleaning is safeguarded, during cleaning, closes intake pump 2, dosing pump 6, coagulation agitating device 8, is then turned on aeration
Pump 10, opens aeration zone evacuation port 13 and empties aerated reaction groove, opens micro-hole aerator 12, aerator cleaning pump 14, carries out clear
Wash.
Embodiment 2 is same as in Example 1, simply wherein step 2) the air supporting stage in the aperture of aeration head be 0.08 μ
M, aeration intensity 3Nm3/(m2/ h), aeration zone flow rate of water flow 9m/h, time of contact 20min.
Embodiment 3 is same as in Example 1, simply wherein step 2) the air supporting stage in micro-hole aerator aperture equal to 0.1 μ
M, aeration intensity 2Nm3/(m2/ h), aeration zone flow rate of water flow 7m/h, time of contact 15min.
Embodiment 4:
1) the water inlet dosing stage: open manually-operated gate 1 before intake pump, by the high concentration salt manufacturing halogen that Baume degrees is 18-24 ° of B é
Coolant-temperature gage is heated to 25-35 DEG C of its subject range, subsequently into intake pump 2, opens water inlet manually-operated gate 3 and makes salt manufacturing salt enter
Entering coagulation district 9, feed water flow gauge 4 monitors flow of inlet water simultaneously.Open dosing pump 6 and enter medicine effusion meter 7, coagulant polymeric chlorine
Change aluminum is entered inlet channel by grug feeding jar 5 and mixes with salt, and control chemical feeding quantity is 50ppm, enters coagulation district 9.
2) in the coagulation stage: coagulant polymeric aluminium chloride enters coagulation district after mixing with salt manufacturing salt, coagulation stirring dress is utilized
Putting 8 pairs of mixed liquors to be stirred, level Four speed of agitator is followed successively by 400r/min, 50r/min, 20r/min, 20r/min, controls to stop
Staying the time to be followed successively by 50s, 360s, 360s, 360s, stirring terminates rear water outlet and enters contact zone of dissolved air flotation 15, and the coagulation stage can will make
In bittern water, big flocculate swept along into by float, colloid etc..
3) the air supporting stage: the water outlet of coagulation district enters contact zone of dissolved air flotation 15, opens aeration pump 10 and inlet air flow gauge 11 is supervised
Surveying aeration rate, aeration enters salt by micro-hole aerator 12, and wherein micro-hole aerator for organize aeration unit, described aeration more
Unit includes the central canal connected with supply air line and the arm being provided with aeration head connected with described central canal.Described
Micro-hole aerator is arranged on the bottom of flotation tank contact area, and the water outlet in coagulation district is entered flotation tank by the bottom of flotation tank contact area
Contact area.The hole of aeration head is equal to 0.1 μm, aeration intensity 2Nm3/(m2/ h), aeration zone flow rate of water flow 7m/h, time of contact
15min；A large amount of bubbles entrance flotation tanks, by flco band to water surface, after air supporting has contacted, enter flotation separation zone 16.Air supporting
System produces the water overfall 22 by air supporting clear water zone 23, enters and produces pond 24.
4) scrape slag, froth breaking stage: open mud-scraping apparatus 17, arrange its cycle be start 45s, stop 10min, by scrape mud fill
Water surface top layer scum silica frost is scraped to scum trough 18 by the scraper plate installed, and scum silica frost liquid portion, from flowing to scum silica frost collecting pit 19, is opened
Scum silica frost froth breaking intake pump 20, scum silica frost froth breaking feed water flow gauge 21 monitors scum silica frost collecting pit to scum trough shower inflow, scum silica frost
Froth breaking shower 25 lower end has and some is smaller in size than 1mm hole, utilizes spray froth breaking to be eliminated by bubble in scum trough by shower.
Micro-hole aerator routine cleaning is safeguarded, during cleaning, closes intake pump 2, dosing pump 6, coagulation agitating device 8, is then turned on aeration
Pump 10, opens aeration zone evacuation port 13 and empties aerated reaction groove, opens micro-hole aerator 12, aerator cleaning pump 14, carries out clear
Wash.
Embodiment 5 is the same as in Example 4, simply wherein step 2) level Four speed of agitator 200r/min in the coagulation stage,
40r/min, 10r/min, 10r/min, control the time of staying be followed successively by 30s, 240s, 240s, 240s.Step 3) the air supporting stage
In the aperture of aeration head be 0.08 μm, aeration intensity 3Nm3/(m2/ h), aeration zone flow rate of water flow 9m/h, time of contact 20min；
Embodiment 6 is same as in Example 1, wherein step 2) in the coagulation stage, level Four speed of agitator is followed successively by 600r/
Min, 60r/min, 30r/min, 30r/min, control the time of staying be followed successively by 80s, 420s, 420s, 420s, step 3) air supporting
In stage, micro-hole aerator aperture is equal to 0.1 μm, aeration intensity 1Nm3/(m2/ h), aeration zone flow rate of water flow 5m/h, time of contact
11min。
Embodiment 1-6 all can obtain the enforcement purpose of the present embodiment, and the salt colourity after i.e. processing substantially reduces, and colourity≤
25, process for successive depths and lighten the load, meanwhile, the distribution of salt particle diameter changes, and former water particle footpath is substantially in 1 to 10 μm, and air supporting is produced
Particle water particle diameter is effectively removed in 1 to 1.5 μm, a large amount of colloids, suspended contaminant.The air-flotation treatment method that the present invention uses
Salt manufacturing salt salinity will not be reduced.
Below in conjunction with most preferred embodiment 3,4, the present invention is described in further detail.
100 ton per day demonstration researchs are carried out in August, 2015-October in Tianjin.
Demonstration research effect:
1: air-flotation system water inlet, product colority of water removal effect test: sampling Detection, randomization 2 results such as table 1 shows
Go out.Table 1 illustrates that air-flotation system produces colority of water and is decreased obviously, and chroma removal rate can reach more than 30%, after wherein adding coagulant
Chroma removal rate increases, but increasing is not clearly.
Table 1
2: salt Baume degrees is tested:
Enter, produce water Baume degrees and enter at the high concentration salt manufacturing clear water air-flotation system of 18-24 ° of B é, produce the sampling inspection of ripples U.S. angle value
Survey.The air-flotation system processing mode that shows table 2 will not reduce salt manufacturing salt Baume angle value.
Table 2
| Date | Water inlet (Baume degrees) | Produce water (Baume degrees) | Embodiment |
| 8.7 | 18 | 18 | 3# |
| 8.11 | 18 | 18 | 4# |
| 8.18 | 19 | 19 | 3# |
| 8.22 | 19 | 19 | 4# |
| 8.25 | 18 | 18 | 3# |
| 8.30 | 24 | 24 | 4# |
| 9.3 | 18 | 18 | 3# |
| 9.7 | 20 | 20 | 4# |
| 9.11 | 19 | 19 | 3# |
| 9.13 | 20 | 20 | 4# |
| 9.19 | 19 | 19 | 3# |
| 9.26 | 24 | 24 | 4# |
| 9.27 | 18 | 18 | 3# |
| 9.29 | 23 | 23 | 4# |
3. particle diameter distribution tests:
To former water, be embodiment 3,4 air-flotation system produce water carry out particle diameter distribution detection, to characterize system to colloidal solid thing
Removal effect.Air-flotation system former water particle footpath substantially in 1-10 μm, air-flotation system produce water particle footpath major part be distributed in 1.2 μm with
Under, based on the little granule about 1 μm, mean diameter has declined, and illustrates that air-flotation system effectively eliminates a large amount of colloid.
Owing to salt manufacturing halogen impurities in water is more, particularly with float such as colloids, tradition sand filtration, sedimentation is shone on beach cannot
Colloidal impurity is effectively treated.The invention air flotation technology is applied to high concentration salt manufacturing brine treatment, for
The problems such as high salinity Brine salinity is high, big, the pressure air-dissolving weak effect of viscosity, the aperture to micro-hole aerator, and aeration intensity,
Aeration zone flow rate of water flow, time of contact etc., condition effectively selected.Micropore≤0.1 μm micro-hole aerator is used to disperse
Gas distribution, produces micro-bubble works very well, and flco, float in effective adhesion, removal salt manufacturing salt, at High Concentration Brine ring
Under border, air flotation effect is far superior to pressurized dissolved air flotation.Salt colourity after process substantially reduces, colourity≤25, for successive depths
Process lightens the load, and meanwhile, the distribution of salt particle diameter changes, and former water particle footpath is substantially in 1 to 10 μm, and air supporting produces particle water particle diameter 1
To 1.5 μm, a large amount of colloids, suspended contaminant are effectively removed.The air-flotation treatment method that the present invention uses will not reduce salt manufacturing
Salt salinity.
Additionally, the present invention is for the coagulant in coagulation stage and mixing speed, and the water inlet temperature of high concentration salt manufacturing salt
The selection that degree is optimized, the effect making air supporting roguing is more excellent.
Micro-hole aerator is arranged on the bottom of flotation tank contact area simultaneously, is simultaneously provided with multiple aeration head, can increase exposure
Gas effect.The water outlet in coagulation district is entered flotation tank contact area by the bottom of flotation tank contact area, and salt injects from bottom to top, at this
During, the salt in pond goes to produce vibrations can make floccule more abundant with the micro-bubble that the micro-hole aerator of bottom produces
Contact, increase aeration effect.
The present invention uses micro-hole aerator to disperse gas distribution air supporting method, compares pressurized dissolved air flotation, shallow air-floatation etc. and saves back
Stream pump, pipe fitting and valve etc., it is to avoid equipment is easily by problems such as high salinity salt corrosion.
The present invention uses spraying technique to carry out scum silica frost froth breaking.Due to the characteristics such as salt manufacturing brine viscosities is high, surface tension is big, pole
Easy to foaming, scum layer can assemble a large amount of bubble, and impact is normal to be used, it is therefore desirable to carry out defoaming treatment.Spray froth breaking hydromining
With supernatant in scum silica frost collecting pit, the most additionally using fresh water, orifice size 1mm on shower, defoaming effect is good.The art of this patent
Supernatant in scum silica frost collecting pit is recycled, and circulation carries out scum trough froth breaking, improves Brine resources utilization rate.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (9)
1. the high concentration pneumatically supported processing method of salt manufacturing salt, it is characterised in that comprise the steps:
1) the water inlet dosing stage: by the high concentration salt manufacturing salt that Baume degrees is 18-24 ° of B é, entered by water inlet pipe through water pump lifting
Entering coagulation district, coagulant adds coagulation district by dosing pump simultaneously；
2) the coagulation stage: salt carries out coagulation stirring in coagulation district after mixing with medicament；Utilize the coagulation stage can be by salt manufacturing salt
Middle float, colloid etc. are de-surely, be gathered into flocculate, and water outlet enters flotation tank contact area.
3) the air supporting stage: the water outlet of coagulation district enters flotation tank contact area, and described flotation tank contact area is provided with micro-hole aerator, micro-
Aerator aperture≤0.1, hole μm, aeration intensity 1-3Nm3/(m2/ h), aeration zone flow rate of water flow 5-9m/h, time of contact 11-
20min；After air supporting has contacted, entering flotation separation zone, disengaging time 40-75min, scum silica frost is collected after floating and is entered scum silica frost
Groove, the salt after process enters air supporting clear water zone；In clear water zone, salt exits into product pond by overfall；
4) scrape slag, froth breaking stage: producing scum silica frost and use automatic control transmission slag-scraper to scrape scum trough, scum period is startup 45s,
Stopping 10min, scum silica frost is flow to scum silica frost bucket certainly by dreg scraping trough.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 1, it is characterised in that described coagulant is
Aluminium polychlorid, the consumption of described coagulant is: 0-50ppm；When described dosage of PAC is zero, step 1) in height
Concentration salt manufacturing salt is without step 2) in the coagulation stage, and be directly entered step 3) the air supporting stage, other steps are identical.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 1, it is characterised in that described step 2)
In, the coagulation stage is divided into level Four, one-level high speed flocculation zone rotating speed 200-600r/min, time of staying 30-80s, two grades of flocculation zones
Rotating speed 40-60r/min, time of staying 240-420s, three grades of flocculation zone rotating speed 10-30r/min, time of staying 240-420s, four
Level flocculation zone rotating speed 10-30r/min, time of staying 240-420s.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 1, it is characterised in that step 4) in scum silica frost
Bubble utilize shower carry out spray debubbling method effectively eliminate, shower water derives from the supernatant of scum silica frost collecting pit.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 4, it is characterised in that on described shower
Being provided with multiple aperture, the aperture of described aperture is less than 1mm.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 1, it is characterised in that expose at described micropore
Gas device top is provided with cleaning pump.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 1, it is characterised in that step 1) in highly concentrated
The temperature of degree salt manufacturing salt is 25-35 DEG C.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 1, it is characterised in that described flotation tank connects
The bottom touching district is provided with micro-hole aerator, and the water outlet in coagulation district is entered flotation tank contact area by the bottom of flotation tank contact area.
High concentration salt manufacturing salt air-flotation treatment method the most according to claim 1, it is characterised in that described micro-pore aeration
Device is aeration unit, and described aeration unit includes the central canal connected with supply air line and connects with described central canal
It is provided with a plurality of arm of aeration head.
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| CN116040656A (en) * | 2022-12-14 | 2023-05-02 | 中盐金坛盐化有限责任公司 | Method and device for removing organic matters in brine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108946998A (en) * | 2018-04-16 | 2018-12-07 | 南安市创培电子科技有限公司 | A kind of advanced treatment process of sewage |
| EP3736031A1 (en) * | 2019-05-10 | 2020-11-11 | Sugino Machine Limited | Liquid treatment apparatus and liquid treatment method |
| CN113501606A (en) * | 2021-06-25 | 2021-10-15 | 天津长芦汉沽盐场有限责任公司 | Saturated brine purification method |
| CN116040656A (en) * | 2022-12-14 | 2023-05-02 | 中盐金坛盐化有限责任公司 | Method and device for removing organic matters in brine |
| CN116040656B (en) * | 2022-12-14 | 2024-08-13 | 中盐金坛盐化有限责任公司 | Method and device for removing organic matters in brine |
| CN118359324A (en) * | 2023-01-17 | 2024-07-19 | 中盐金坛盐化有限责任公司 | Low-nitrate high-magnesium-calcium brine purification system adopting flue gas method |
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| CN106219652B (en) | 2019-06-04 |
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