CN105753203B - Oil sand washing water treatment method - Google Patents
Oil sand washing water treatment method Download PDFInfo
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- CN105753203B CN105753203B CN201410805966.2A CN201410805966A CN105753203B CN 105753203 B CN105753203 B CN 105753203B CN 201410805966 A CN201410805966 A CN 201410805966A CN 105753203 B CN105753203 B CN 105753203B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005406 washing Methods 0.000 title claims abstract description 28
- 238000011282 treatment Methods 0.000 title abstract description 8
- 239000002351 wastewater Substances 0.000 claims abstract description 87
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 239000003208 petroleum Substances 0.000 claims abstract description 21
- 239000000126 substance Substances 0.000 claims abstract description 21
- 238000005345 coagulation Methods 0.000 claims abstract description 18
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- 238000012545 processing Methods 0.000 claims description 35
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 125000002091 cationic group Chemical group 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- 239000005995 Aluminium silicate Substances 0.000 claims description 8
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 claims description 8
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 8
- 235000012211 aluminium silicate Nutrition 0.000 claims description 8
- 229920000620 organic polymer Polymers 0.000 claims description 8
- 229920000642 polymer Polymers 0.000 claims description 8
- 239000002585 base Substances 0.000 claims description 7
- 229920000592 inorganic polymer Polymers 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 150000001299 aldehydes Chemical class 0.000 claims description 3
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- 239000004411 aluminium Substances 0.000 claims description 2
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Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
An oil sand washing water treatment method, comprising the following steps: 1) mixing the wastewater separated after washing the oil sand with acid or alkali through a first-stage Venturi mixer, and adjusting the pH value of the wastewater to 7.6-8.6; 2) the treated wastewater is mixed with a demulsifier through a second-stage Venturi mixer again; 3) discharging the wastewater treated in the step 2) into an oil removal sedimentation tank, and removing suspended oil and sandy soil; 4) performing cyclone separation on the wastewater after oil removal sedimentation to remove particles with the particle size of more than 50 microns in the water; 5) enabling the wastewater after cyclone separation to enter a coagulation air flotation device, and further removing suspended matters and petroleum substances in a suspended and dissolved state in the wastewater; 6) filtering the wastewater treated in the step 5) to obtain oil sand washing water. The technical method has short flow and low energy consumption in the treatment process, and can remove sand particles, clay and oil sand asphalt in the oil sand washing wastewater more thoroughly.
Description
Technical field
The present invention relates to oil-sand wash water process a kind of processing method, oil-sand washings after treatment, in removal
The many kinds of substance such as sand grains, clay, oil sands bitumen and chemical agent are recycled as oil-sand washings.
Background technology
Oil-sand as a kind of unconventional petroleum resources, wherein oil sands bitumen content 5~20%, sand and clay content 80~
85%, aqueous 3~5%.Its stock number accounts for about the 30% of world oil reserves, if all utilization is produced, according to the present world
The desired level of the energy, for century-old on consumed worldwide, the utilization of oil-sand become new growth engines.According to oil-sand master
Host country of the resources is wanted to count, the oil-sand resource amount that the world is verified at present is about 3.8 trillion barrels.It is mainly distributed on Canada, Venezuela
And the U.S., in the world most of oil-sand resource concentrate on Transport Model for Alberta province the north basins Athabasca and Pinghu and Ah
Er Baita saves the chilling index with Saskatchewan intersection.The development of oil-sand makes Canadian petroleum reserves be only second to Saudi Arabia
The whole world second is occupied, international community is allowed to be further appreciated that the value of oil-sand.A large amount of oil-sand resource is had also discovered in China, is stored up
About 100,000,000,000 tons of amount, according to the 5th, the world, is concentrated mainly on 24 basins such as Zhunger Basin, Qaidam, Erdos and pine the Liao Dynasty.
In the investigation of China National Oil Gas Resources, oil-sand resource received to people's appraisement system for the first time, by evaluation, the oil content of China's oil-sand exists
5%~20%, there is good economic development value and foreground.
Currently, in the world oil-sand exploitation, separation be still in infancy, oil-sand have viscosity is big, density is high, separation
Viscous crude contains a large amount of small grains of sand and minerals, and many technologies are still had in the separation, processing and tailings glass of oil sands bitumen
Problem, oil-sand exploitation application are constantly subjected to restrict.Huge toxic tailing pit is generated in oil-sand recovery process, and environment is caused
Very big harm.Maximum seven oil-sand companies (Canadian Natual Resources, Imperial Oil, Shell
Canada, Suncor Energy, Syncrude Canada Ltd., Teck Resources and Total E＆PCanada)
An alliance is set up in December, 2010, to solve most intractable one of the challenge of industry：Clear up their huge toxic tailing pit.
This means that oil-sand company will make joint efforts, unified strength pushes tailing management and switching technology tricks of the trade, is sold without being attempt to
Perhaps but other people use its intellectual property.
Oil-sand strip mining transformation at present mainly uses washing separation technology, using the heating of thermokalite water, stirring, makes oil and sand point
From the waste generated in separation process is mainly water and oil sands bitumen, the mixture of suspended matter, clay, sand, chemical agent.
Since pitch mixes with water, clay visibly homogeneous, sedimentation separation is highly difficult.Transport Model for Alberta, which saves oil-sand mining area, at present 8
More than hundred million cubic metres of tailing is stored in 142 square kilometres of tailing pit, and tailing inventory is continuously increased.Based on centrifuge modelling
It studies, the ageing fine earth tailing in tailing pit needs ability free settling separation in more than 130 years, it not only stores a large amount of water
Vast soil is alsied occupy, the processing of the tailing pit waste water generated after oil-sand washing and Utilizing question are oil-sand processing enterprise faces
One of huge challenge faced.
CN101855177A propositions are a kind of to use membrane separating method, processing oil-sand to wash tailing water, contain in the waste water
A large amount of clay, oil sands bitumen and chemical agent, processing procedure film are easy to block, and energy expenditure is big.
CN103359861A proposes a kind of processing method of oil-sand washes, includes the following steps：Oil-sand is exploited dirty
Water carries out homogenization in homogeneous slot, and the sewage after homogenization, which is then entered air-float degreasing device, carries out at oil removal by air bubbling
Reason removes partial suspended oil and a small amount of oil emulsion；Sewage after air supporting is entered into flocculation-air floating device, detaches flocculate；It will
Flocculation-air floating sewage is centrifuged, and obtains sands formation re-injection water.The process is in oil removal by air bubbling and flocculation-air floating process
In, a large amount of clay of oil-containing and the grains of sand in sewage are easy blocking pipeline and equipment, influence the long-term operation of device.
CN103351072A provides a kind of oil-sand exploitation wastewater treatment method, and the sewage that oil-sand washing is isolated is carried out
Then homogeneous carries out oil removal by air bubbling, remove most of suspended oil and a small amount of oil emulsion, flocculation treatment is then carried out, after flocculation
Waste water clarified, filtered, softened, centrifuged, obtain boiler reinjected water.The process approach long flow path, energy consumption is big, and preceding
The removal for not carrying out depth in processing procedure to containing a large amount of sand in washings detaches, and will be brought to the subsequent processing of waste water
Prodigious difficulty.
The invention discloses the processing systems of a kind of oil sand tailing or oil sand slurries by CN102676199A, can be from oil-sand tail
Residual bitumen is recycled in mine or oil sand slurries, and oil sand tailing can be cured, so as to easily use economical and environmentally friendly
Mode is disposed.
In conclusion for the treatment technology of current oil-sand washings, although certain processing, reuse effect can be reached
Fruit, while also there are still shortcomings, influence the reuse of oil-sand washings, form a large amount of tailing pit, cause water resource
Waste and serious environmental pollution, it would be highly desirable to handle.
Invention content
The purpose of the present invention is to provide a kind of oil-sand method for processing wash water, and water is be easy to cause in the prior art to overcome
The waste of resource and the defect of serious environmental pollution.
To achieve the above object, the present invention provides a kind of oil-sand method for processing wash water, includes the following steps：
The waste water that step 1 is separated after washing oil-sand is mixed by first order venturi mixer with acid or alkali,
Between the pH value for adjusting waste water is 7.6~8.6；
Step 2 again passes by second level venturi mixer and is mixed with demulsifier by step 1 treated waste water,
The dosage that demulsifier is added in control is 30~300mg/L；
Step 3 will pass through step 2, and treated that waste water is discharged into oil removal settling tank, and it is 0.5 to be kept for the residence time of waste water
~3.0h removes suspended oil and sandy soil；
Waste water after step 4 settles oil removal carries out cyclonic separation, removes the particulate matter that grain size is 50 μm or more in water removal；
Waste water after cyclonic separation is entered coagulation air-float device by step 5, further removes the suspension in waste water
Object and in suspend and dissolved state petroleum substance；
Step 6 will pass through step 5, and treated that waste water is filtered, and obtains oil-sand washings.
Wherein, the acid described in the step 1 is selected from hydrochloric acid, sulfuric acid or nitric acid.
Wherein, the acid described in the step 1 is the concentrated sulfuric acid.
Wherein, the acid described in the step 1 is weak acid.
Wherein, the alkali described in the step 1 is selected from sodium hydroxide or potassium hydroxide.
Wherein, the alkali described in the step 1 is weak base.
Wherein, the alkali described in the step 1 is selected from sodium hydroxide or potassium hydroxide.
Wherein, the pH value described in the step 1 is 7.6~8.2.
Wherein, demulsifier dosage described in the step 2 is 50~150mg/L.
Wherein, the residence time of waste water is 1~2.5h in the step 3.
Wherein, flocculant is added in the coagulation air-float device in the step 5.
Wherein, the flocculant is inorganic polymer flocculant or organic polymer coargulator.
Wherein, the inorganic polymer flocculant is aluminium polychloride or aluminium silicate polymer.
Wherein, the organic polymer coargulator is cationic polyacrylamide.
Wherein, the cationic polyacrylamide molecular weight is 700~10,000,000.
Wherein, the inorganic polymer flocculant dosage is 40~100mg/L.
Wherein, the organic polymer coargulator dosage is 2~50mg/L.
Wherein, it is quartz sand, activated carbon or chemical fibre that filter core material used is filtered in the step 6.
Wherein, demulsifier is ethers demulsifier, aldehydes demulsifier or lipid demulsifier in the step 2.
The beneficial effects of the invention are as follows：
The present invention uses the combination treatment method of " oil removal sedimentation-cyclonic separation-coagulation air-float-filtering ".It the advantage is that：
1. to a large amount of sands contained in oil-sand washes, different, the sedimentation time difference according to its grain size carries out multilayer classifying
Processing, class settling, sand sedimentation are more thorough；2. existence is not in waste water according to asphalt-base petroleum substance in waste water
Together, oil droplet size difference, carries out classification separation, and petroleum substance separation removal is more thorough；3. in waste water the grains of sand, clay,
The many kinds of substance such as petroleum-type realize advanced treating, and treated, and waste water can be used as oil-sand washings to recycle；4. using two
Grade venturi mixer is used in series, and Flow of Goods and Materials speed is fast, and the sand grains for avoiding grain size larger is deposited on inside equipment or pipeline,
It blocks；5. a whole set of oil-sand washs water handling reclamation set, method flow is short, and low energy consumption, high treating effect.
Description of the drawings
Fig. 1 is the method flow schematic diagram of embodiment 1.
In Fig. 1,1- venturi mixers；2- venturi mixers；3- oil removal settling tanks；4- cyclones；5- coagulation air-floats
Device；6- filters.
Specific implementation mode
Oil-sand washes is passed through venturi mixer by the present invention first, is neutralized and is mixed with demulsifier, is then drained into
Oil removal settling tank, oil separator water outlet carry out cyclonic separation, air supporting and filtering processing, the wastewater treatment generated after oil-sand is washed
After recycle.Specifically include following steps：
The waste water that step 1 is separated after washing oil-sand is mixed with strong acid (or alkali) by first order venturi mixer
It closes, between the pH value for adjusting waste water is 7.6~8.6；
Step 2 again passes by second level venturi mixer by step 1 treated waste water, mixed with demulsifier
It closes, the dosage that demulsifier is added in control is 30~300mg/L；
Step 3 will pass through step 2, and treated that waste water is discharged into oil removal settling tank, and it is 0.5 to be kept for the residence time of waste water
~3.0h removes a large amount of sand in the most of suspended oil and waste water in water；
Waste water after step 4 settles oil removal carries out cyclonic separation, removes the particulate matter that grain size is 50 μm or more in water removal；
Waste water after cyclonic separation is entered coagulation air-float device by step 5, depth remove suspended matter in waste water,
In the petroleum substance to suspend with dissolved state；
Treated that waste water is filtered by step 5 for step 6, filtered water turbidity≤5NTU, and petroleum content≤
25mg/L, suspension content≤25mg/L obtain oil-sand washings.
Currently preferred process conditions are as follows：
The acid added in venturi mixing is selected from hydrochloric acid, sulfuric acid, nitric acid etc., the preferably concentrated sulfuric acid, can also select other weak
Acid.The alkali is selected from sodium hydroxide, potassium hydroxide, can also select other weak base.
PH value preferably 7.6~8.2；Demulsifier dosage preferably 50~150mg/L, retention time of sewage is preferred in settling tank
1~2.5h.
It is that inorganic polymer flocculant and organic polymer are wadded a quilt with cotton that flocculant, flocculation medicament are needed in coagulation air-float processing procedure
Solidifying agent；Inorganic polymer flocculant preferred polymeric aluminium chloride, aluminium silicate polymer, dosage preferably 40~100mg/L；Organic polymer
Flocculant preferred cationic polyacrylamide, molecular weight preferably 700~10,000,000, dosage preferably 2~50mg/L.
Filter element material can select quartz sand, activated carbon and chemical fibre etc., preferably chemical fibre and quartz sand material.
Demulsifier can select to use ethers demulsifier, aldehydes demulsifier or lipid demulsifier.
In the present invention, the concentrated sulfuric acid is added in First venturi mixing period in oil-sand washes, adjusts the soda acid of waste water
After degree, into second venturi mixer, waste water enters oil removal settling tank after being mixed with demulsifier, in oil removal settling tank,
Oil droplet in emulsified state is subjected to coalescence, removal of floating, a large amount of sand sedimentation removal in waste water；Settling tank water outlet enters
Cyclone separator, the different centrifugal force generated by density contrast further remove the sand of about 50 μm of grain size or more in waste water；Through
It crosses cyclone treated that waste water enters coagulation air-float device, pass through and high valency electrolytes are added, destroy the stabilization shape of water-borne glue body
State, makes that suspended matter is de- steady, agglomerates and removes, and during air supporting, a large amount of microbubble is attached on oil droplets, helps to make place
Floating in the fine oil droplets of suspended state and removal；A large amount of alumen ustum is generated in coagulation process, the absorption using alumen ustum and " net
Catch " it acts on, depth removes the petroleum substance that emulsified state is in waste water.By coagulation air-float, treated that waste water entered
Filter, after filtration treatment, water turbidity≤5NTU, petroleum content≤25mg/L, suspension content≤25mg/L, waste water can
As oil-sand washings, recycle.
The main characteristic of the invention lies in that the sand content for isolating waste water for oil-sand washing is high, not only have in waste water
The grains of sand also have a large amount of clay, are easy to block pipeline and equipment, it is difficult to sedimentation separation；Petroleum substance in waste water is with asphaltic base
Based on crude oil, density is closer with water, and asphalt-base crude oil mixes fully with the grains of sand, clay, it is difficult to detach.Select two-stage text mound
In mixer be used in series, it is that Flow of Goods and Materials speed is high in venturi mixer that reason, which has, prevents contained a large amount of sand of waste water
Soil sedimentation, occluding device and pipeline.
The present invention uses oil removal settling tank, waste water that can settle out the larger sand of grain size, while waste water in the equipment
Middle part carries out floating separation in the petroleum-type of suspended state.
The present invention is using a large amount of sands contained in cyclone separation waste water, by fluid high-speed flowing and rotary course
The centrifugal force of generation carries out the separation of sand in waste water, and separative efficiency is high, separating rate is fast.
The present invention uses coagulation air-float, handles suspended matter and oils in waste water, and main cause is by the way that high price electricity is added
Xie Zhi destroys the stable state of water-borne glue body, makes that suspended matter is de- steady, agglomerates and removes, during air supporting, a large amount of microbubble
Oil droplets are attached on, the floating of the fine oil droplets in suspended state and removal are contributed to；It is generated in coagulation process a large amount of
Alumen ustum is acted on using the absorption of alumen ustum and " net is caught ", and depth removes the petroleum substance that emulsified state is in waste water.
The present invention uses filter as afterbody treatment process before oil-sand washing waste water reutilizing, and main cause is to return
Increase level-one guarantee and safety with water, it can be with the suspended matter and petroleum substance in filtered wastewater.
Embodiment 1：
Oil-sand washes pH value is 10.2, and sand content 5600mg/L, oil content 1200mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 7.6, then adds polyethers demulsification 100mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 1.6h, sand content 1100mg/L in settling tank water outlet, oil content
100mg/L.Settling tank treated waste water is sent into cyclone, sand content is 160mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 50mg/L, and cationic polyacrylamide addition is 2mg/L, mistake
Cocoanut active charcoal is loaded in filter.Filter delivery turbidity 4.6NTU, petroleum content 6.0mg/L, suspension content are
23mg/L, waste water can be used as oil-sand washings, recycle.
Comparative example 1：
By oil-sand washes, pH value 10.2, sand content 5600mg/L, oil content 1200mg/L, in homogeneous slot
Homogenization is carried out, pH value of waste water of adjusting is 7.6, and the sewage after homogenization is then entered air-floating apparatus, and aluminium silicate polymer is thrown
Dosage is 50mg/L, and cationic polyacrylamide addition is 2mg/L, after carrying out oil removal by air bubbling processing, to being produced during air supporting
Raw dross is centrifuged, and dross is sent to garbage disposal site and is focused on.Air-floating apparatus water outlet is analyzed, is tied
Fruit shows：Delivery turbidity 36.7NTU, petroleum content 52mg/L, suspension content 87mg/L, turbidity, the oil of waste water
Class and suspension content are difficult to reach reuse requirement, it is also necessary to be further processed；More seriously, neutralize regulating reservoir and
There is a large amount of sand to deposit in flotation tank and the inlet/outlet pipeline of equipment, needs the operation for constantly clearing up ability holding meanss.
Embodiment 2：
Oil-sand washes pH value is 9.8, and sand content 3300mg/L, oil content 1400mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 7.9, then adds polyethers demulsification 100mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 3h, sand content 1000mg/L in settling tank water outlet, oil content
110mg/L.Settling tank treated waste water is sent into cyclone, sand content is 120mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 80mg/L, and cationic polyacrylamide addition is 30mg/L, mistake
Quartz sand is loaded in filter.Filter delivery turbidity 5.0NTU, petroleum content 24mg/L, suspension content 25mg/L,
Waste water can be used as oil-sand washings, recycle.
Embodiment 3：
Oil-sand washes pH value is 9.0, and sand content 6000mg/L, oil content 1500mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 8.2, then adds polyethers demulsification 220mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 3h, sand content 1800mg/L in settling tank water outlet, oil content
150mg/L.Settling tank treated waste water is sent into cyclone, sand content is 170mg/L after cyclonic separation, then into
Row coagulation air-float and filter device, aluminium silicate polymer dosage are 100mg/L, and cationic polyacrylamide addition is 50mg/L,
Chemical fibre matter filler is loaded in filter.Filter delivery turbidity 3.0NTU, petroleum content 16mg/L, suspension content are
20mg/L, waste water can be used as oil-sand washings, recycle.
Embodiment 4：
Oil-sand washes pH value is 12.0, and sand content 1200mg/L, oil content 900mg/L are mixed by venturi
After device adds concentrated sulfuric acid mixing, pH value of waste water of adjusting is 8.6, then adds polyethers demulsification 30mg/L, is mixed by venturi
Device mixes, and waste water enters oil removal settling tank, sedimentation time 1.0h, sand content 400mg/L in settling tank water outlet, oil content
90mg/L.Settling tank treated waste water is sent into cyclone, sand content is 80mg/L after cyclonic separation, is then carried out
Coagulation air-float and filter device, aluminium silicate polymer dosage are 60mg/L, and cationic polyacrylamide addition is 50mg/L, filtering
Quartz sand is loaded in device.Filter delivery turbidity 4.6NTU, petroleum content 20mg/L, suspension content 18mg/L give up
Water can be used as oil-sand washings, recycle.
The present invention uses the combination treatment method of " oil removal sedimentation-cyclonic separation-coagulation air-float-filtering ".It the advantage is that：
1. to a large amount of sands contained in oil-sand washes, different, the sedimentation time difference according to its grain size carries out multilayer classifying
Processing, class settling, sand sedimentation are more thorough；2. existence is not in waste water according to asphalt-base petroleum substance in waste water
Together, oil droplet size difference, carries out classification separation, and petroleum substance separation removal is more thorough；3. in waste water the grains of sand, clay,
The many kinds of substance such as petroleum-type realize advanced treating, and treated, and waste water can be used as oil-sand washings to recycle；4. using two
Grade venturi mixer is used in series, and Flow of Goods and Materials speed is fast, and the sand grains for avoiding grain size larger is deposited on inside equipment or pipeline,
It blocks；5. a whole set of oil-sand washs water handling reclamation set, method flow is short, and low energy consumption, high treating effect.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
Various corresponding change and deformations, but these corresponding change and deformations can be made according to the present invention by knowing those skilled in the art
The protection domain of the claims in the present invention should all be belonged to.
Claims (18)
1. a kind of oil-sand method for processing wash water, which is characterized in that include the following steps：
The waste water that step 1 is separated after washing oil-sand is mixed by first order venturi mixer with acid or alkali, is adjusted useless
Between the pH value of water is 7.6~8.6；
Step 2 again passes by second level venturi mixer and is mixed with demulsifier by step 1 treated waste water, control
The dosage that demulsifier is added is 30~300mg/L；
Step 3 will pass through step 2, and treated that waste water is discharged into oil removal settling tank, keep the residence time of waste water be 0.5~
3.0h removes suspended oil and sandy soil；
Waste water after step 4 settles oil removal carries out cyclonic separation, removes the particulate matter that grain size is 50 μm or more in water removal；
Waste water after cyclonic separation is entered coagulation air-float device by step 5, further removes suspended matter and place in waste water
In the petroleum substance with dissolved state that suspends；
Step 6 will pass through step 5, and treated that waste water is filtered, and obtains oil-sand washings.
2. oil-sand method for processing wash water according to claim 1, which is characterized in that the acid choosing described in the step 1
From hydrochloric acid, sulfuric acid or nitric acid.
3. oil-sand method for processing wash water according to claim 1, which is characterized in that the acid described in the step 1 is
The concentrated sulfuric acid.
4. oil-sand method for processing wash water according to claim 1, which is characterized in that the acid described in the step 1 is
Weak acid.
5. oil-sand method for processing wash water according to claim 1, which is characterized in that the alkali choosing described in the step 1
From sodium hydroxide or potassium hydroxide.
6. oil-sand method for processing wash water according to claim 1, which is characterized in that the alkali described in the step 1 is
Weak base.
7. oil-sand method for processing wash water according to claim 1, which is characterized in that the pH value described in the step 1
It is 7.6~8.2.
8. oil-sand method for processing wash water according to claim 1, which is characterized in that demulsifier described in the step 2
Dosage is 50~150mg/L.
9. oil-sand method for processing wash water according to claim 1, which is characterized in that the stop of waste water in the step 3
Time is 1~2.5h.
10. oil-sand method for processing wash water according to claim 1, which is characterized in that described mixed in the step 5
Flocculant is added in solidifying air-floating apparatus.
11. oil-sand method for processing wash water according to claim 10, which is characterized in that the flocculant is inorganic high score
Sub- flocculant or organic polymer coargulator.
12. oil-sand method for processing wash water according to claim 11, which is characterized in that the inorganic polymer flocculant
For aluminium polychloride or aluminium silicate polymer.
13. oil-sand method for processing wash water according to claim 11, which is characterized in that the organic polymer coargulator
For cationic polyacrylamide.
14. oil-sand method for processing wash water according to claim 13, which is characterized in that the cationic polyacrylamide
Molecular weight is 700~10,000,000.
15. oil-sand method for processing wash water according to claim 11, which is characterized in that the inorganic polymer flocculant
Dosage is 40~100mg/L.
16. oil-sand method for processing wash water according to claim 11, which is characterized in that the organic polymer coargulator
Dosage is 2~50mg/L.
17. oil-sand method for processing wash water according to claim 1, which is characterized in that in the step 6 used in filtering
Filter core material is quartz sand, activated carbon or chemical fibre.
18. oil-sand method for processing wash water according to claim 1, which is characterized in that demulsifier is in the step 2
Ethers demulsifier, aldehydes demulsifier or lipid demulsifier.
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