CN107253813A - The recovery and treatment method of greasy filth - Google Patents
The recovery and treatment method of greasy filth Download PDFInfo
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- CN107253813A CN107253813A CN201710672421.2A CN201710672421A CN107253813A CN 107253813 A CN107253813 A CN 107253813A CN 201710672421 A CN201710672421 A CN 201710672421A CN 107253813 A CN107253813 A CN 107253813A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- 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
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/10—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing sonic or ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/04—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by extraction
-
- 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
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
Abstract
The present invention discloses a kind of recovery and treatment method of greasy filth.The recovery and treatment method of the greasy filth comprises the following steps：By greasy filth, water and extractant in mass ratio 1:2:0.3 0.7 mixing；Wherein, the extractant is the built agent for including low boiling point organic solvent, dispersant and anion surfactant；Step S1 mixture is subjected to supersonic oscillations, greasy filth extractant mixed solution is formed；Greasy filth extractant mixed solution is subjected to solid-liquid centrifugation separation, de-oiling sludge and profit extractant mixed liquor is obtained；Profit extractant mixed liquor is subjected to water separation and oil purification is reclaimed.The recovery and treatment method for the greasy filth that the present invention is provided, separation costs are low, efficiency high and can realize oily sludge petrochina extract recovery, reused resource.
Description
【Technical field】
The present invention relates to technical field of sludge treatment, and in particular to a kind of recovery and treatment method of greasy filth.
【Background technology】
Greasy filth refers in oilfield process, due to oil extraction, and storage collects defeated, processing, and the processing of crude oil Produced Liquid
During the sludge that produces.It is broadly divided into famous containing some of crude oil or crude oil composition：Ground sludge, clear tank
Greasy filth, flotation scum silica frost etc..
General oil content is in 10-50% in greasy filth, and moisture content is in 40-90%, China's oil chemical industries, every year on average
800,000 t tank bottoms mud, bottom of pond mud are produced, Shengli Oil Field produces oily sludge more than 100,000 tons every year, and Dagang Oilfield is produced every year
About 150,000 tons of oily sludge, Henan Oil Field produces 5 × 104m3 oily sludges every year.In oily sludge containing substantial amounts of benzene homologues,
The noxious material of the foul smellings such as phenols, anthracene, pyrene, if not being acted upon directly discharge, not only takes a large amount of arable lands, and to surrounding
Soil, water body, air will all be polluted, also containing substantial amounts of pathogen, parasite (ovum), copper, zinc, chromium, mercury etc. in sludge
The poisonous and harmful substance of the difficult degradation such as heavy metal, salt and Polychlorinated biphenyls, dioxin, radionuclide.At present, oil sludge and sand oneself
Through being classified as hazardous waste by country.
Since the mid-80, the developed country such as the U.S., Japan, Germany, former Soviet Union begin one's study efficient low-consume processing
The method and technique of greasy filth.The method of processing oily sludge typically has both at home and abroad now：Burning method, biological treatment, hot wash are washed
Method, thermal desorption method, solvent extraction, chemical demulsification method, solid-liquid isolation method etc..Oily sludge is after burning disposal, Duo Zhongyou
Evil material almost all is removed, and is worked well, but its investment is big, and cost is high, need to often add in combustion-supporting fuel, burning process with
Serious air pollution, and crude oil can not be reclaimed, so the practical efficiency in China's incinerator is relatively low；Hot washing method is
The method that EPA's processing oily sludge is preferentially used, this method energy expenditure is low, and expense is not high, is that China is studied at present
Process for treating oil-containing sludge that is more, more generally using, but also be present the problem of organic efficiency is not high in this method, need to treat further
It is perfect；Thermal desorption is a kind of sludge high temperature processing method of remodeling, and greasy filth is heated to certain temperature under anoxic condition makes hydro carbons
And organic matter desorption, the technique was developed rapidly and applied abroad early 1990s, is primarily adapted for use in processing oil and is contained
Amount is more than 30% oily sludge, and the technique has higher technology content, requires higher to reaction condition, processing cost is higher,
Operation is more complicated, need be further perfect；Solvent extraction is one kind to handle the small oil-containing 1O%-2O% of many particles of silt
Oily sludge effective technology, the technology utilization extractant dissolves oily sludge, after agitated and centrifugation, most of organic
Thing and oil are extracted agent from mud and extracted, and then reclaim extract and carry out distilling solvent to separate from mixture following
Ring is used, and oil recovery is then used for freshening, but the cost of technique recycling is higher, less efficient, also needs further to solve to close
Key technology problem.
Although the processing method of oily sludge is a lot, all because not extensive the shortcomings of specific aim is not strong, processing cost is high
Promote.The innoxious, integrated treatment that cleans and reclaim wherein resource is carried out to oily sludge, as home and abroad environment protection and
One of emphasis of petroleum industry.
Therefore, a kind of inexpensive, simple, efficient greasy filth recovery and treatment method of research and development is needed badly.
【The content of the invention】
The purpose of the present invention is to overcome above-mentioned technical problem there is provided a kind of separation costs are low, efficiency high and can realize oil-containing
The recovery and treatment method for the greasy filth that sludge petrochina is extracted.
The technical scheme is that：
A kind of recovery and treatment method of greasy filth, comprises the following steps：
Step S1：By greasy filth, water and extractant in mass ratio 1:2:0.3-0.7 is mixed；Wherein, the extractant be comprising
The built agent of low boiling point organic solvent, dispersant and anion surfactant；
Step S2：Step S1 mixture is subjected to supersonic oscillations, greasy filth extractant mixed solution is formed；
Step S3：Greasy filth extractant mixed solution is subjected to solid-liquid centrifugation separation, de-oiling sludge and profit extractant is obtained
Mixed liquor；
Step S4：Profit extractant mixed liquor is subjected to water separation and oil purification is reclaimed.
It is preferred that, in the extractant, low boiling point organic solvent, dispersant and anion surfactant in mass ratio 1:
0.3-0.5:0.5-0.8 is compounded.
It is preferred that, the low boiling point organic solvent is the one or more in chloroform, 1,1- dichloroethanes, ethyl acetate.
It is preferred that, the dispersant is sodium metasilicate or/and calcium stearate.
It is preferred that, the anion surfactant is PAMA or/and neopelex amine.
It is preferred that, the oil content of the greasy filth is 10-20%.
It is preferred that, in step S2, the frequency of supersonic oscillations is 35KHz.
It is preferred that, in step S3, the rotating speed of centrifugation is 600-1200rmp.
Compared with correlation technique, the recovery and treatment method for the greasy filth that the present invention is provided, beneficial effect is：
First, the recovery and treatment method for the greasy filth that the present invention is provided, is combined by the way of ultrasonic wave and solvent extraction, is carried out
Oily efficient extraction in greasy filth.Wherein, the extractant that the present invention is used is by low boiling point organic solvent, dispersant and anionic surface
Activating agent compounding is formed, in ultrasound-extraction process, because the dispersant adsorption in extractant is in the surface of solid particle, drop
Interfacial tension between low liquid-liquid or solid-liquid, anion surfactant has good degreasing power and has reduction water well
Surface tension and wetting, infiltration and emulsification performance, in the synergy and ultrasound of dispersant and anion surfactant
Under the invigoration effect of ripple, low boiling point organic solvent and the fully dissolving of the oil in greasy filth realize solid phase, oil by centrifugal separation method
Phase is efficiently separated.After testing, it can realize that separation oily in greasy filth is returned substantially using the recovery and treatment method of the greasy filth of the present invention
Receive, oily content is less than 0.1% in the greasy filth after processing.
The recovery and treatment method for the greasy filth that the present invention is provided, by way of intensified by ultrasonic wave is extracted, is had using low boiling
The extractant of machine solvent-dispersion agent-anion surfactant compounding, substantially increases extraction efficiency, makes oily in extraction process
Oil in mud is sufficiently mixed dissolving with solvent, it is to avoid the problems such as separation recovery efficiencies are not high in the prior art, handling process is long.
2nd, the recovery and treatment method for the greasy filth that the present invention is provided, the de-oiling sludge oil content after processing is low, can be used as building materials
Raw material are comprehensively utilized；Obtained liquid can realize that the separation of water and the purification of oil are reclaimed using existing maturation process.
3rd, the recovery and treatment method for the greasy filth that the present invention is provided, processing technological flow is simple, preparation method is simple, obtains
It is better than the recovering effect of prior art, with good economic benefit and environmental benefit.
【Embodiment】
Below will the invention will be further described by embodiment.
Embodiment 1
The recovery and treatment method for the greasy filth that the present invention is provided, comprises the following steps：
Step S1：By greasy filth, water and extractant in mass ratio 1:2:0.3 mixing；Wherein, the extractant is to include low boiling
Select the built agent of organic solvent, dispersant and anion surfactant；
Specifically, low boiling point organic solvent, dispersant and anion surfactant in mass ratio 1:0.3:0.5 compounding；
Wherein low boiling point organic solvent is selected from chloroform, and dispersant is selected from sodium metasilicate, and anion surfactant is selected from anion pp
Acid amides；
The oil content of greasy filth is 10%；
Step S2：Step S1 mixture is subjected to supersonic oscillations, greasy filth extractant mixed solution is formed；
Specifically, start supersonic gas vibrating device carries out supersonic oscillations 20min, ultrasonic wave frequency to step S1 mixture
Rate is 35KHz, forms greasy filth extractant mixed solution；
Step S3：Greasy filth extractant mixed solution is subjected to solid-liquid centrifugation separation, de-oiling sludge and profit extractant is obtained
Mixed liquor；
Specifically, the time of centrifugation is 5min, rotating speed is 600rmp, by carrying out solid-liquid centrifugation separation, realizes sludge
Deoiling treatment；
Step S4：Profit extractant mixed liquor is subjected to water separation and oil purification is reclaimed, and obtained de-oiling sludge conduct
Raw building material.
After testing, the oil content of the de-oiling sludge after processing is 0.08%.
Embodiment 2
The recovery and treatment method for the greasy filth that the present invention is provided, comprises the following steps：
Step S1：By greasy filth, water and extractant in mass ratio 1:2:0.7 mixing；Wherein, the extractant is to include low boiling
Select the built agent of organic solvent, dispersant and anion surfactant；
Specifically, low boiling point organic solvent, dispersant and anion surfactant in mass ratio 1:0.5:0.8 compounding；
Wherein low boiling point organic solvent is selected from 1,1- dichloroethanes, and dispersant is selected from calcium stearate, and anion surfactant is selected from ten
Dialkyl benzene sulfonic acids sodium amine；
The oil content of greasy filth is 20%；
Step S2：Step S1 mixture is subjected to supersonic oscillations, greasy filth extractant mixed solution is formed；
Specifically, start supersonic gas vibrating device carries out supersonic oscillations 30min, ultrasonic wave frequency to step S1 mixture
Rate is 35KHz, forms greasy filth extractant mixed solution；
Step S3：Greasy filth extractant mixed solution is subjected to solid-liquid centrifugation separation, de-oiling sludge and profit extractant is obtained
Mixed liquor；
Specifically, the time of centrifugation is 10min, rotating speed is 1200rmp, by carrying out solid-liquid centrifugation separation, is realized dirty
The deoiling treatment of mud；
Step S4：Profit extractant mixed liquor is subjected to water separation and oil purification is reclaimed, and obtained de-oiling sludge conduct
Raw building material.
After testing, the oil content of the de-oiling sludge after processing is 0.06%.
Embodiment 3
The recovery and treatment method for the greasy filth that the present invention is provided, comprises the following steps：
Step S1：By greasy filth, water and extractant in mass ratio 1:2:0.6 mixing；Wherein, the extractant is to include low boiling
Select the built agent of organic solvent, dispersant and anion surfactant；
Specifically, low boiling point organic solvent, dispersant and anion surfactant in mass ratio 1:0.5:0.7 compounding；
Wherein low boiling point organic solvent is selected from ethyl acetate, and dispersant is selected from sodium metasilicate, and anion surfactant is selected from dodecyl
Benzene sulfonic acid sodium salt amine；
The oil content of greasy filth is 15%；
Step S2：Step S1 mixture is subjected to supersonic oscillations, greasy filth extractant mixed solution is formed；
Specifically, start supersonic gas vibrating device carries out supersonic oscillations 25min, ultrasonic wave frequency to step S1 mixture
Rate is 35KHz, forms greasy filth extractant mixed solution；
Step S3：Greasy filth extractant mixed solution is subjected to solid-liquid centrifugation separation, de-oiling sludge and profit extractant is obtained
Mixed liquor；
Specifically, the time of centrifugation is 8min, rotating speed is 800rmp, by carrying out solid-liquid centrifugation separation, realizes sludge
Deoiling treatment；
Step S4：Profit extractant mixed liquor is subjected to water separation and oil purification is reclaimed, and obtained de-oiling sludge conduct
Raw building material.
After testing, the oil content of the de-oiling sludge after processing is 0.09%.
Compared with correlation technique, the recovery and treatment method for the greasy filth that the present invention is provided, beneficial effect is：
First, the recovery and treatment method for the greasy filth that the present invention is provided, is combined by the way of ultrasonic wave and solvent extraction, is carried out
Oily efficient extraction in greasy filth.Wherein, the extractant that the present invention is used is by low boiling point organic solvent, dispersant and anionic surface
Activating agent compounding is formed, in ultrasound-extraction process, because the dispersant adsorption in extractant is in the surface of solid particle, drop
Interfacial tension between low liquid-liquid or solid-liquid, anion surfactant has good degreasing power and has reduction water well
Surface tension and wetting, infiltration and emulsification performance, in the synergy and ultrasound of dispersant and anion surfactant
Under the invigoration effect of ripple, low boiling point organic solvent and the fully dissolving of the oil in greasy filth realize solid phase, oil by centrifugal separation method
Phase is efficiently separated.After testing, it can realize that separation oily in greasy filth is returned substantially using the recovery and treatment method of the greasy filth of the present invention
Receive, oily content is less than 0.1% in the greasy filth after processing.
The recovery and treatment method for the greasy filth that the present invention is provided, by way of intensified by ultrasonic wave is extracted, is had using low boiling
The extractant of machine solvent-dispersion agent-anion surfactant compounding, substantially increases extraction efficiency, makes oily in extraction process
Oil in mud is sufficiently mixed dissolving with solvent, it is to avoid the problems such as separation recovery efficiencies are not high in the prior art, handling process is long.
2nd, the recovery and treatment method for the greasy filth that the present invention is provided, the de-oiling sludge oil content after processing is low, can be used as building materials
Raw material are comprehensively utilized；Obtained liquid can realize that the separation of water and the purification of oil are reclaimed using existing maturation process.
3rd, the recovery and treatment method for the greasy filth that the present invention is provided, processing technological flow is simple, preparation method is simple, obtains
It is better than the recovering effect of prior art, with good economic benefit and environmental benefit.
Above-described is only embodiments of the present invention, it should be noted here that for one of ordinary skill in the art
For, without departing from the concept of the premise of the invention, improvement can also be made, but these belong to the protection model of the present invention
Enclose.
Claims (8)
1. a kind of recovery and treatment method of greasy filth, it is characterised in that comprise the following steps：
Step S1：By greasy filth, water and extractant in mass ratio 1:2:0.3-0.7 is mixed；Wherein, the extractant is to include low boiling
Select the built agent of organic solvent, dispersant and anion surfactant；
Step S2：Step S1 mixture is subjected to supersonic oscillations, greasy filth extractant mixed solution is formed；
Step S3：Greasy filth extractant mixed solution is subjected to solid-liquid centrifugation separation, de-oiling sludge and the mixing of profit extractant is obtained
Liquid；
Step S4：Profit extractant mixed liquor is subjected to water separation and oil purification is reclaimed.
2. the recovery and treatment method of greasy filth according to claim 1, it is characterised in that in the extractant, low boiling has
Machine solvent, dispersant and anion surfactant in mass ratio 1:0.3-0.5:0.5-0.8 is compounded.
3. the recovery and treatment method of greasy filth according to claim 2, it is characterised in that the low boiling point organic solvent is chlorine
One or more in imitative, 1,1- dichloroethanes, ethyl acetate.
4. the recovery and treatment method of greasy filth according to claim 2, it is characterised in that the dispersant be sodium metasilicate or/
And calcium stearate.
5. the recovery and treatment method of greasy filth according to claim 2, it is characterised in that the anion surfactant is
PAMA or/and neopelex amine.
6. the recovery and treatment method of greasy filth according to claim 1, it is characterised in that the oil content of the greasy filth is 10-
20%.
7. the recovery and treatment method of greasy filth according to claim 1, it is characterised in that in step S2, supersonic oscillations
Frequency is 35KHz.
8. the recovery and treatment method of greasy filth according to claim 1, it is characterised in that in step S3, turn of centrifugation
Speed is 600-1200rmp.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107879572A (en) * | 2017-11-24 | 2018-04-06 | 东隆环保科技有限公司 | A kind of processing method of oily sludge |
| CN108251153A (en) * | 2017-12-26 | 2018-07-06 | 中国石油天然气集团公司 | A kind of dehydrating aging process for purification and its system |
| CN108640218A (en) * | 2018-04-02 | 2018-10-12 | 中石化石油工程技术服务有限公司 | A kind of rejected well drilling liquid solid-liquid separation treatment method and application |
| CN109197306A (en) * | 2018-07-23 | 2019-01-15 | 柯江波 | A kind of engrafting method of polychrome Bougainvillea spectabilis |
| CN109675340A (en) * | 2019-03-07 | 2019-04-26 | 黄河三角洲京博化工研究院有限公司 | A kind of de-oiling agent and its application method cleaning waste rolling oil greasy filth |
| CN110204175A (en) * | 2019-05-28 | 2019-09-06 | 中国海洋石油集团有限公司 | A kind of new method dissolving polymer-containing oil sludge in polymer-bearing waste-water processing system |
| CN110386753A (en) * | 2019-06-28 | 2019-10-29 | 陕西欧菲德环保科技有限公司 | A kind of greasy filth acidity separating treatment agent and method for separating and processing |
| CN110563295A (en) * | 2019-09-27 | 2019-12-13 | 中国科学院新疆理化技术研究所 | Method for efficiently treating tank bottom oil sludge |
| CN111333283A (en) * | 2020-03-04 | 2020-06-26 | 中稀天马新材料科技股份有限公司 | Treatment method of recovered oil in neodymium iron boron waste oil mud |
| CN111607431A (en) * | 2020-05-26 | 2020-09-01 | 中国石油大学(北京) | Online desalting device and method for fractionating tower top circulation system |
| CN112316500A (en) * | 2020-09-30 | 2021-02-05 | 中国石油天然气股份有限公司 | Ultrasonic cyclone separation device |
| CN117285213A (en) * | 2023-10-08 | 2023-12-26 | 北京航天中伟科技工程自动化有限公司 | Universal oil field oil-containing dirty sludge recycling reduction treatment process |
| CN117566987A (en) * | 2023-11-08 | 2024-02-20 | 竣云智能装备科技集团有限公司 | Process for efficiently recycling crude oil in floor oil sludge |
| CN117285213B (en) * | 2023-10-08 | 2024-05-10 | 北京航天中伟科技工程自动化有限公司 | Universal oil field oil-containing dirty sludge recycling reduction treatment process |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107879572A (en) * | 2017-11-24 | 2018-04-06 | 东隆环保科技有限公司 | A kind of processing method of oily sludge |
| CN107879572B (en) * | 2017-11-24 | 2020-12-25 | 东隆环保科技有限公司 | Treatment method of oily sludge |
| CN108251153B (en) * | 2017-12-26 | 2020-05-08 | 中国石油天然气集团公司 | Aging oil dehydration refining method and system |
| CN108251153A (en) * | 2017-12-26 | 2018-07-06 | 中国石油天然气集团公司 | A kind of dehydrating aging process for purification and its system |
| CN108640218A (en) * | 2018-04-02 | 2018-10-12 | 中石化石油工程技术服务有限公司 | A kind of rejected well drilling liquid solid-liquid separation treatment method and application |
| CN109197306A (en) * | 2018-07-23 | 2019-01-15 | 柯江波 | A kind of engrafting method of polychrome Bougainvillea spectabilis |
| CN109675340A (en) * | 2019-03-07 | 2019-04-26 | 黄河三角洲京博化工研究院有限公司 | A kind of de-oiling agent and its application method cleaning waste rolling oil greasy filth |
| CN110204175A (en) * | 2019-05-28 | 2019-09-06 | 中国海洋石油集团有限公司 | A kind of new method dissolving polymer-containing oil sludge in polymer-bearing waste-water processing system |
| CN110386753A (en) * | 2019-06-28 | 2019-10-29 | 陕西欧菲德环保科技有限公司 | A kind of greasy filth acidity separating treatment agent and method for separating and processing |
| CN110386753B (en) * | 2019-06-28 | 2021-09-28 | 陕西欧菲德环保科技有限公司 | Oil sludge acidic separation treating agent and separation treating method |
| CN110563295A (en) * | 2019-09-27 | 2019-12-13 | 中国科学院新疆理化技术研究所 | Method for efficiently treating tank bottom oil sludge |
| CN111333283A (en) * | 2020-03-04 | 2020-06-26 | 中稀天马新材料科技股份有限公司 | Treatment method of recovered oil in neodymium iron boron waste oil mud |
| CN111607431A (en) * | 2020-05-26 | 2020-09-01 | 中国石油大学(北京) | Online desalting device and method for fractionating tower top circulation system |
| CN112316500A (en) * | 2020-09-30 | 2021-02-05 | 中国石油天然气股份有限公司 | Ultrasonic cyclone separation device |
| CN117285213A (en) * | 2023-10-08 | 2023-12-26 | 北京航天中伟科技工程自动化有限公司 | Universal oil field oil-containing dirty sludge recycling reduction treatment process |
| CN117285213B (en) * | 2023-10-08 | 2024-05-10 | 北京航天中伟科技工程自动化有限公司 | Universal oil field oil-containing dirty sludge recycling reduction treatment process |
| CN117566987A (en) * | 2023-11-08 | 2024-02-20 | 竣云智能装备科技集团有限公司 | Process for efficiently recycling crude oil in floor oil sludge |
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Application publication date: 20171017 |