CN102718378A - Method of cement kiln co-processing for calcium-added and passivated town sludge - Google Patents
Method of cement kiln co-processing for calcium-added and passivated town sludge Download PDFInfo
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- CN102718378A CN102718378A CN201210235669XA CN201210235669A CN102718378A CN 102718378 A CN102718378 A CN 102718378A CN 201210235669X A CN201210235669X A CN 201210235669XA CN 201210235669 A CN201210235669 A CN 201210235669A CN 102718378 A CN102718378 A CN 102718378A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention discloses a method of cement kiln co-processing for calcium-added and passivated town sludge and solves the technical problems that the content of organic matters in the town sludge is lower while the content of heavy metals in the town sludge is higher, the nature of the sludge is not stable, the moisture content of the sludge is high and the sludge is difficult to transport. The implementation steps of the method are as follows: firstly, the constituents and the moisture content of the town sludge are tested, the pH value of the town sludge is usually between 6 and 8, and when the sludge meets leachate within the pH value range or in the landfilling state, the heavy metals are dissolved out easily, and the increasing of the pH value of the sludge is beneficial for passivation of the heavy metals and reduction of dissolution of the heavy metals; the town sludge is mixed with waste lime to ensure that the pH value of the mixture is between 9 and 10, and the mixture is kept stable at room temperature for 2-7 days; and the mixture enters a novel dry-process cement kiln from below a predecomposition furnace, silicon and calcium in the sludge and calcium in the lime can be used to produce silicate cement, and the organic matters in the sludge can be burnt so as to replace partial cement kiln fuel. The method of the cement kiln co-processing for the calcium-added and passivated town sludge is an economical, fuel-saving and low-pollution method for resource utilization of the town sludge.
Description
Technical field
The present invention relates to a kind of city sludge and increase the method for carrying out cement kiln synergic processing after the calcium passivation, be specifically related to contain the innoxious method with recycling of the city sludge of heavy metal, belong to the solid waste disposal technical field.
Background technology
China town sewage treatment facility has formed the processing power of mass-producing through the high speed construction in " 15 " and Eleventh Five-Year Plan period.By in by the end of September, 2010, city, city, county are established and part emphasis organic town (hereinafter to be referred as " cities and towns ") accumulative total is built up and reach 1.69 hundred million m building sewage treatment capacity in the whole nation
3/ d; Wherein 36 big and medium-sized cities (municipality directly under the Central Government, provincial capital and municipalities and cities with independent plans) have 376 of sewage works, and processing power reaches 4,368 ten thousand m
3/ d.In county town and township, town, have 1008 of sewage works, processing power reaches 1,826 ten thousand m
3/ d.
The characteristics of urban wastewater treatment firm and mud are:
(1) the middle and small scale urban wastewater treatment firm occupies higher proportion, and its quantity is 3 times of big and medium-sized cities sewage work, and sewage work's scale is less than normal, and processing power is merely 42% of big and medium-sized cities sewage work, and the average treatment ability is merely 1.8 ten thousand m
3/ d, south some on a small scale urban wastewater treatment firms treatment scale in addition have only 1000-5000m
3/ d.
(2) sewage source, character instability: the water inlet of middle and small scale cities and towns comprises industrial sewage and sewage, and the trade effluent proportion is higher, and the industrial sewage ratio reaches more than 80% in the water inlet of part of contaminated water treatment plant, even 95%.In addition, the medium-sized and small enterprises nature difference is big, because the unstable of the difference of changes of seasons, production purpose, production technique causes the fluctuation of sewage character significantly, finally causes the fluctuation of Sewage Plant water inlet character big, and the sludge components fluctuation is big.
(3) organic content of mud is lower, ash content is high, calorific value is low: the mud organic content that big and medium-sized cities sewage work produces is high; Account for butt about 60%; Mud organic substance content through after the digestion process still accounts for about 40%, and urban wastewater treatment firm causes the mud organic content low because the industrial sewage ratio is high; Sewage work's organic content of significant proportion is lower than 30%, even has only 18.1%; Meanwhile, the content of ash content significantly increases, even reaches 78%; The low level as received basis calorific value of mud is negative value basically.
(4) heavy metal is of a great variety in the mud, and the content significant difference: because industrial sewage occupies very at high proportion in the water inlet, and the nature difference of industrial enterprise is remarkable; Cause in the mud heavy metal of a great variety; And the content significant difference, As, Cd, Ni, Pb, Cr, Cu and Zn equal size rangeability are very big, and extreme difference is up to several thousand mg/kg; Cause in the sludge treatment disposal process being prone to produce that environmental pollution is serious, the percolate of high density heavy metal, secondary pollution is serious.
These characteristics of city sludge have seriously limited the use of the existing treatment technology of mud; And low organic content characteristic makes that compost is unfavorable for carrying out smoothly; High heavy metal concentration feature limits the agricultural and landfill disposal of sludge composting product; Make that also the secondary pollution of burning process is serious, low-volatile, high ash oontent and low level as received basis calorific value are that negative value causes burning process need consume more fuel.
The environmental problem that city sludge brings does not still cause enough attention, and treatment technology is also very deficient targetedly.How properly disposing city sludge, reach the double goal that pollutes the control and the utilization of resources simultaneously, take into account the target of environmental protection and economy, is the difficult scientific problems that needs to be resolved hurrily.
Summary of the invention
The present invention is to be purpose to address the above problem; To city sludge organic content lower (VS < 40%) and heavy metal content is higher and sludge quality is unstable; And water ratio is high-leveled and difficult in the technical barrier of transportation, and a kind of economy, oligosaprobic city sludge resource utilization method are provided.
The objective of the invention is to realize through following technical proposals: a kind of city sludge increases the method for carrying out cement kiln synergic processing after the calcium passivation; This method realizes through following step: earlier the composition and the water ratio of city sludge are measured; The pH value of mud in the 6-8 scope, runs into percolate usually under this pH value or landfill condition, heavy metal is easy to stripping; The pH value that improves mud helps the passivation of heavy metal, reduces the stripping of heavy metal.Mix with used lime then; The pH value that guarantees mixture is 9-10; Stablized under the room temperature 2-7 days; Get into the new type nonaqueous cement kiln from the predecomposition furnace below then, calcareous composition can be produced silicate cement in siliceous, calcareous composition in the mud and the lime, and the organic matter burning in the mud can substitute the part cement kiln fuel.
The concrete practice: be that 80% urban wastewater treatment firm mud mixes with used lime with water ratio earlier; Place the mud mixing and blending machine, fully stir, guarantee that the pH value of mixture is 9-10; The uniform mixing product was stacked 2-7 days naturally; Be discrete particle shape or bulk, then with the alternative ratio of mud dry weight 1%-10%, that is: to account for the mass ratio of raw material (producing the raw material of cement) be 1%-10% to city sludge.Get into the new type nonaqueous cement kiln from predecomposition furnace below, realize recycling, mud is owing to have high heating value and can substitute the portion water stall and use coal, energy-conservation (these words delete) of realization cement kiln simultaneously.Calcinate is an ordinary portland cement clinker.Applied cement kiln must have the environmental protection equipment that meets national requirements for environmental protection.Behind associated treatment city sludge and the used lime, the kiln ash that is produced needs all or part of reuse.Part is provided by the organic burning of described city sludge in the thermal source of the calcining temperature that is reached.
Grog rate value is the important indicator of control cement quality, mainly comprises lime saturation factor (KH), silicon rate (SM), three rate values of aluminium rate (AM).The silicon rate is represented SiO in the cement clinker
2With Al
2O
3And Fe
2O
3The ratio of sum, SM commonly used representes.
The aluminium rate is represented Al in the grog
2O
3And Fe
2O
3Ratio, represent with AM.
Lime saturation factor representes in the grog that whole silicon oxide generate the ratio of the required calcium oxide content of Calucium Silicate powder and the required quicklime maximum level of silicon oxide generation tricalcium silicate, represent with KH.
The ratio that city sludge carries out product and cement slurry after the lime stabilization guarantees that the silicon rate (SM) of grog is about 2.5 (non-dimensional); Aluminium rate (IM) is about 1.5 (non-dimensional); Saturation ratio (KH) is about 0.9 (non-dimensional); Get into calcining in the dry-process cement rotary kiln then, calcining temperature is 1300 ℃-1450 ℃.
The present invention has the following advantages:
(1) uses used lime as mud passivator, realize the treatment of wastes with processes of wastes against one another, meet the recycling economy target;
(2) use the siccative of used lime as mud, the mixture of mud and used lime is 40%-50% through the water ratio after stable, is beneficial to transportation and subsequent disposal;
(3) use used lime as heavy metal deactivator, the raising of mud alkalescence makes the reactivity of heavy metal significantly reduce;
(4) use used lime as stablizer, make the temperature of mud raise, reach the effect of quick sterilization;
(5) use used lime as passivator, reduced the cost of sludge disposal;
(6) the used lime amount of using is low, is merely 5%-20%;
(7) mixture of mud and used lime carries out cement kiln synergic processing, has realized recycling,
Landfill, the potential heavy metal pollution problem of mixture have been avoided;
(8) adopt the cement kiln synergic processing technology, character (heavy metal and the organic matter) fluctuation of city sludge is had flexibility in a big way;
(9) mud adopts the lime mummification and has certain calorific value after the stacking naturally, can substitute portion water stall thermal source, fuel economy.
Embodiment
City sludge of the present invention increases the method for carrying out cement kiln synergic processing after the calcium passivation; Be that city sludge is through mixing with used lime; Realization increases the calcium passivation; Be beneficial to transportation,, can realize the resource recycling and the energy recovery utilization of refuse simultaneously as the part alternative materials and the alternative fuel of ordinary Portland cement.
Concrete steps are following:
At first city sludge is carried out composition analysis, clear and definite heavy metal, organic matter and moisture is percentage composition separately; City sludge is mixed with used lime, and the adding proportion of used lime is the 5%-20% of city sludge, places the mud mixing and blending machine; Fully stir, the uniform mixing product was stacked 2-7 days naturally, was discrete particle shape or bulk; With the alternative ratio of 1%-10% (calculating with mud dry weight), the silicon rate, aluminium rate and the saturation ratio that guarantee grog get into the new type nonaqueous cement kiln from the predecomposition furnace below in suitable scope then; Calcine, produce ordinary Portland cement.
Through concrete example method of the present invention is described below, but the present invention is not limited thereto.TP described in the following instance like no specified otherwise, is ordinary method; Said equipment and material like no specified otherwise, all can obtain from industrial production or commercial sources;
Embodiment 1
A kind of city sludge; Water ratio is 78.2%; Volatile content is 18.1%, and the content of heavy metal Zn, Cu, Cr, Ni is respectively 1046mg/kg, 293mg/kg, 244mg/kg and 221mg/kg, and the content of Sr, Mn, Ba is respectively 766mg/kg, 535mg/kg and 386mg/kg.Add 10% (quality percentage composition) used lime, adopt worm conveyor to be delivered to and place the mud mixing and blending machine, fully stir; Under sunlight direct projection condition, stack 7d naturally; The water ratio of mud and used lime is 40%, with the alternative mixed of raw material (composition is seen table 1) according to 2% (calculating with mud and used lime dry weight), satisfies the SM=2.5 of grog; IM=1.5, KH=0.9.The clinker burning method is: the uniform mixture of mud and used lime and cement slurry uniform mixing add hydraulic pressure and process φ 100mm * 15mm raw material sheet.In electric elevator furnace, be elevated to 1450 ℃ and calcination 1h, chilling in the air (fan cooling) behind 105 ℃ of oven dry 24h with the temperature rise rate of 20 ℃/min.After the cooling grog piece is worn into 0.08mm on the planet beveller and tail over fine powder less than 10%.The grog that this method is fired is suitable with the industrial production cement clinker quality.
To detecting four kinds of staple tricalcium silicate (C in the grog through calcining back Portland clinker
3S), Dicalcium Phosphate (Feed Grade) (C
2S), tricalcium aluminate (C
3A) and celite (C
4AF) content is respectively 54%, 22.2%, 8.1% and 9.4.
Ordinary Portland cement 1d, 3d and 28d ultimate compression strength through after the calcining are respectively 10MPa, 24MPa and 52MPa.Other indexs satisfy the National Standard general purpose portland cement " (GB175-2007).
Adopt national standard HJ/T299-2007 and the TCLP of EPA (Toxicity Characteristic Leaching Procedure) toxicity to leach program test to grog; The leaching concentration of Cd is respectively 0.003mg/L and does not detect; The leaching concentration of Pb is 0.02mg/L; The leaching concentration of Cu is respectively 0.015mg/L and 0.02mg/L, and the leaching concentration of Zn is 0.1mg/L and 0.03mg/L.The leaching concentration of above heavy metal is all lower.
Embodiment 2
City sludge character is with embodiment 1.Add 15% (quality percentage composition) used lime, adopt worm conveyor to be delivered to and place the mud mixing and blending machine, fully stir; Under sunlight direct projection condition, stack 7d naturally; The water ratio of mud and used lime is 38%, with the alternative mixed of raw material (composition is seen table 1) according to 5% (calculating with mud and used lime dry weight), satisfies the SM=2.4 of grog; IM=1.5, KH=0.9.The clinker burning method is with embodiment 1.
To detecting four kinds of staple tricalcium silicate (C in the grog through calcining back Portland clinker
3S), Dicalcium Phosphate (Feed Grade) (C
2S), tricalcium aluminate (C
3A) and celite (C
4AF) content is respectively 56%, 20%, 7.9% and 9.2.
Ordinary Portland cement 1d, 3d and 28d ultimate compression strength through after the calcining are respectively 11MPa, 22MPa and 54MPa.Other indexs satisfy the National Standard general purpose portland cement " (GB175-2007).
Adopt national standard HJ/T299-2007 and the TCLP of EPA (Toxicity Characteristic Leaching Procedure) toxicity to leach program test to grog; The leaching concentration of Cd does not detect; The leaching concentration of Pb is 0.015mg/L and 0.018mg/L; The leaching concentration of Cu is respectively 0.01mg/L and 0.012mg/L, and the leaching concentration of Zn is 0.15mg/L and 0.03mg/L.The leaching concentration of above heavy metal is all lower.
Embodiment 3
City sludge character is with embodiment 1.Add 20% (quality percentage composition) used lime, adopt worm conveyor to be delivered to and place the mud mixing and blending machine, fully stir; Under sunlight direct projection condition, stack 7d naturally; The water ratio of mud and used lime is 30%, with the alternative mixed of raw material (composition is seen table 1) according to 10% (calculating with mud and used lime dry weight), satisfies the SM=2.5 of grog; IM=1.5, KH=0.9.The clinker burning method is with embodiment 1.
To detecting four kinds of staple tricalcium silicate (C in the grog through calcining back Portland clinker
3S), Dicalcium Phosphate (Feed Grade) (C
2S), tricalcium aluminate (C
3A) and celite (C
4AF) content is respectively 53%, 20%, 8.1% and 9.0.
Ordinary Portland cement 1d, 3d and 28d ultimate compression strength through after the calcining are respectively 10MPa, 21MPa and 51MPa.Other indexs satisfy the National Standard general purpose portland cement " (GB175-2007).
Adopt national standard HJ/T299-2007 and the TCLP of EPA (Toxicity Characteristic Leaching Procedure) toxicity to leach program test to grog; The leaching concentration of Cd does not detect; The leaching concentration of Pb is 0.025mg/L and 0.028mg/L; The leaching concentration of Cu is respectively and does not detect and 0.012mg/L, and the leaching concentration of Zn is 0.17mg/L and 0.09mg/L.The leaching concentration of above heavy metal is all lower.
The composition of table 1 cement slurry (wt%)
Claims (5)
1. a city sludge increases the method for carrying out cement kiln synergic processing after the calcium passivation, and this method realizes through following step: earlier the composition and the water ratio of city sludge are measured, the pH value of mud is usually in the 6-8 scope; Under this pH value or landfill condition, run into percolate; Heavy metal is easy to stripping, and the pH value that improves mud helps the passivation of heavy metal, reduces the stripping of heavy metal; Mix with used lime then; Get into the new type nonaqueous cement kiln from the predecomposition furnace below, calcareous composition can be produced silicate cement in siliceous, calcareous composition in the mud and the lime, and the organic matter burning in the mud can substitute the part cement kiln fuel.
2. a kind of city sludge as claimed in claim 1 increases the method for carrying out cement kiln synergic processing after the calcium passivation; The concrete practice is to be that 80% urban wastewater treatment firm mud mixes with used lime with water ratio earlier, places the mud mixing and blending machine, fully stirs; The pH value that guarantees mixture is 9-10; The uniform mixing product was stacked 2-7 days naturally, was discrete particle shape or bulk, then with the alternative ratio of mud dry weight 1%-10%; That is: to account for the mass ratio of raw material be 1%-10% to city sludge, gets into the new type nonaqueous cement kiln from the predecomposition furnace below.
3. according to claim 1 or claim 2 a kind of city sludge increases the method for carrying out cement kiln synergic processing after the calcium passivation, the city sludge that this method adopts, and water ratio is 78.2%; Volatile content is 18.1%, and the content of heavy metal Zn, Cu, Cr, Ni is respectively 1046mg/kg, 293mg/kg, 244mg/kg and 221mg/kg, and the content of Sr, Mn, Ba is respectively 766mg/kg, 535mg/kg and 386mg/kg; Add 10% used lime by mass percentage, adopt worm conveyor to be delivered to and place the mud mixing and blending machine, fully stir; Under sunlight direct projection condition, stack 7d naturally; The water ratio of mud and used lime is 40%, with raw material according to 2%, the alternative mixed of calculating with mud and used lime dry weight; Satisfy the SM=2.5 of grog; IM=1.5, KH=0.9, the clinker burning method is: the uniform mixture of mud and used lime and cement slurry uniform mixing; Add hydraulic pressure and process φ 100mm * 15mm raw material sheet; In electric elevator furnace, be elevated to 1450 ℃ and calcination 1h with the temperature rise rate of 20 ℃/min behind 105 ℃ of oven dry 24h, chilling in the air is worn into 0.08mm with the grog piece after the cooling and is tailed over the fine powder less than 10% on the planet beveller; The grog that this method is fired is suitable with the industrial production cement clinker quality; To detecting through calcining back Portland clinker, the content of four kinds of staple tricalcium silicates, Dicalcium Phosphate (Feed Grade), tricalcium aluminate and celites is respectively 54%, 22.2%, 8.1% and 9.4% in the grog, is respectively 10MPa, 24MPa and 52MPa through ordinary Portland cement 1d, 3d and 28d ultimate compression strength after the calcining.
4. increase the method for carrying out cement kiln synergic processing after the calcium passivation like claim 1 or 2 or 3 described a kind of city sludges, add the used lime of mass percent 15% in this method, adopt worm conveyor to be delivered to and place the mud mixing and blending machine; Fully stir; Under sunlight direct projection condition, stack 7d naturally, the water ratio of mud and used lime is 38%, the alternative mixed of calculating according to 5% mud and used lime dry weight with raw material; Satisfy the SM=2.4 of grog; IM=1.5, KH=0.9 is to detecting through calcining back Portland clinker; The content of four kinds of staple tricalcium silicates, Dicalcium Phosphate (Feed Grade), tricalcium aluminate and celites is respectively 56%, 20%, 7.9% and 9.2 in the grog, is respectively 11MPa, 22MPa and 54MPa through ordinary Portland cement 1d, 3d and 28d ultimate compression strength after the calcining.
5. increase the method for carrying out cement kiln synergic processing after the calcium passivation like claim 1 or 2 or 3 described a kind of city sludges, add the used lime of mass percent 20% in this method, adopt worm conveyor to be delivered to and place the mud mixing and blending machine; Fully stir; Under sunlight direct projection condition, stack 7d naturally, the water ratio of mud and used lime is 30%, with raw material according to the 10% alternative mixed calculated with mud and used lime dry weight; Satisfy the SM=2.5 of grog; IM=1.5, KH=0.9 is to detecting through calcining back Portland clinker; The content of four kinds of staple tricalcium silicates, Dicalcium Phosphate (Feed Grade), tricalcium aluminate and celites is respectively 53%, 20%, 8.1% and 9.0 in the grog, is respectively 10MPa, 21MPa and 51MPa through ordinary Portland cement 1d, 3d and 28d ultimate compression strength after the calcining.
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Cited By (7)
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|---|---|---|---|---|
| CN103896505A (en) * | 2014-03-25 | 2014-07-02 | 同济大学 | Method for adjusting and controlling feeding mode of lime-dried municipal sludge cooperatively treated with cement kiln |
| CN109354354A (en) * | 2018-11-28 | 2019-02-19 | 四川北方硝化棉股份有限公司 | Acid waste water uses the determination method of terminal after biochemical sludge processing neutralizes |
| CN109607992A (en) * | 2019-01-28 | 2019-04-12 | 沈阳航空航天大学 | The sludge hydro-thermal treatment method of heavy metal in a kind of reduction water phase |
| CN112341011A (en) * | 2020-11-19 | 2021-02-09 | 南京释加软件科技有限公司 | Cooperative intelligent compatibility method for cement kiln |
| CN112759287A (en) * | 2020-12-30 | 2021-05-07 | 山东大学 | Method for preparing portland cement raw material from full solid waste mainly comprising sludge and garbage fly ash |
| CN113149480A (en) * | 2021-05-26 | 2021-07-23 | 辽阳天瑞水泥有限公司 | Sludge treatment system and method |
| CN115583775A (en) * | 2022-11-04 | 2023-01-10 | 沈阳航空航天大学 | Catalytic pyrolysis treatment method for oily sludge |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896505A (en) * | 2014-03-25 | 2014-07-02 | 同济大学 | Method for adjusting and controlling feeding mode of lime-dried municipal sludge cooperatively treated with cement kiln |
| CN103896505B (en) * | 2014-03-25 | 2015-07-29 | 同济大学 | A kind of method of feeding mode regulation and control of cement kiln synergic processing lime mummification municipal sludge |
| CN109354354A (en) * | 2018-11-28 | 2019-02-19 | 四川北方硝化棉股份有限公司 | Acid waste water uses the determination method of terminal after biochemical sludge processing neutralizes |
| CN109607992A (en) * | 2019-01-28 | 2019-04-12 | 沈阳航空航天大学 | The sludge hydro-thermal treatment method of heavy metal in a kind of reduction water phase |
| CN109607992B (en) * | 2019-01-28 | 2022-05-20 | 沈阳航空航天大学 | Sludge hydrothermal treatment method for reducing heavy metals in water phase |
| CN112341011A (en) * | 2020-11-19 | 2021-02-09 | 南京释加软件科技有限公司 | Cooperative intelligent compatibility method for cement kiln |
| CN112759287A (en) * | 2020-12-30 | 2021-05-07 | 山东大学 | Method for preparing portland cement raw material from full solid waste mainly comprising sludge and garbage fly ash |
| CN113149480A (en) * | 2021-05-26 | 2021-07-23 | 辽阳天瑞水泥有限公司 | Sludge treatment system and method |
| CN115583775A (en) * | 2022-11-04 | 2023-01-10 | 沈阳航空航天大学 | Catalytic pyrolysis treatment method for oily sludge |
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|---|---|
| CN102718378B (en) | 2014-01-01 |
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