CN103801113B - A kind of waste oil classification recycle device and method - Google Patents
A kind of waste oil classification recycle device and method Download PDFInfo
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Abstract
A kind of waste oil classification recycle device of the present invention and method, the present invention receives and utilizes device to adopt first grade subsides tank to realize once the first separation of oil, water and thick impurity, realized the secondary separation of secondary oil, water and thin impurity by secondary settling tank, realize recovered oil by centrifugal separator, water is separated with the final of micro-impurity.The thick impurity produced in waste oil classification recycling process, thin impurity and micro-impurity send into raw material plant, and the difference according to physicochemical property sends into sintering process or pelletizing process etc. respectively.Recovered oil is then reused, and water sends into water treatment system.The present invention carries out classification recycling to the waste oil produced in steel industry, and realize the oil in waste oil, water is separated with solid impurity, recovered oil can recycle, and water sends into water treatment system, and solid impurity then sends into raw material plant for the technique such as pelletizing and sintering.
Description
Technical field
The present invention relates to the new processing method of waste oil in a kind of steel industry, belong to changing waste into resources and utilize field.
Background technology
Iron and steel enterprise produces a large amount of waste oil in process of production, as waste lubricating oil, waste hydraulic oil, useless gear oil and waste emulsified mixture etc.The direct discharge of waste oil can cause great pollution, is also the one waste of resource simultaneously.Data shows: developed country's waste oil regeneration amount such as American-European accounts for 21% ~ 35% of use amount, and China is only 4% ~ 13%, and the general efficiency of technique that waste oil regeneration adopts is low, energy consumption is high and can not meet environmental requirement.Therefore, no matter from economic benefit, environmental benefit and social benefit aspect, the harmless resource utilization of carrying out waste oil utilizes, and is all necessary.
Current worldwide oil reclaiming process mainly contains: sulfuric acid clay regeneration technique, flocculation adsorption partition method, solvent process, membrane filtration isolation technics and hydrofinishing method.Sulfuric acid clay regeneration technique had been once the prevailing technology of waste oil regeneration, owing to producing acid sludge during sulfuric acid treatment, produced pernicious gas sulfur dioxide, serious environment pollution simultaneously.Flocculation adsorption partition method has that technique is simple, corrosivity is little, pollute the advantages such as little.But for fluid, flocculant is inherently a kind of to be polluted.The more important thing is, different purposes waste oil is needed to develop different flocculants, limits the popularization of flocculation process in waste oil regeneration to a great extent.Solvent process utilizes organic solvent different to impurities exhibit such as base oil component in waste oil and additive, oxidation product, greasy filth, by base oil and impurity separately.Solvent process not only consumes a large amount of reagent increases sewage disposal burden simultaneously.Membrane filtration isolation technics utilizes the selection permeability of film, is separated by the impurity in waste oil with active ingredient.But because oil viscosity is large, make fluid very little by the permeation flux of film, require high to filter membrane material, and the easy blocking pollution of membrane pores, affect separating effect.The significant advantage of hydrofinishing method does not have waste disposal problem, also there is the features such as the rate of recovery is high, good product quality simultaneously, but its construction to device, operation, maintenance, maintenance requirement are relatively stricter, and need suitable hydrogen source, and current domestic and international application is relatively less.
The present invention relates to the new processing method of waste oil in a kind of steel industry, while realizing environmental protection, realize the recycling of resource.
Summary of the invention
Technical problem: the waste oil kind produced for steel industry is many, quality large and main component is the features such as oil, water and solid impurity, the present invention relates to the new processing method of waste oil in a kind of steel industry, classification recycling is carried out by the waste oil produced in steel industry, realize the oil in waste oil, water is separated with solid impurity, recovered oil can recycle, water sends into water treatment system, and solid impurity then sends into raw material plant for the technique such as pelletizing and sintering.The invention provides a kind of waste oil classification recycle device and method, solve the problem.
Technical scheme: the invention provides a kind of waste oil classification recycle device, this device comprises waste oil valve, one-level smoke valve, first grade subsides tank, one-level grain slag valve, one-level grain slag separator box, fuel tap, secondary smoke valve, secondary settling tank, secondary grain slag valve, secondary grain slag separator box, secondary fuel tap, centrifugal separator, tertiary effluent slag valve, tertiary effluent slag separator box and a pump; Wherein,
Waste oil valve is connected with first grade subsides tank waste oil entrance, one-level smoke valve is connected with first grade subsides tank one-level smoke inlet, the high-temperature flue gas entering first grade subsides tank is discharged from one-level exhanst gas outlet, and first grade subsides pot bottom is connected by one-level grain slag valve with one-level grain slag separator box; First grade subsides tank oil export is connected by a fuel tap and secondary settling tank oil-in, secondary smoke valve is connected with secondary settling tank secondary smoke entrance, the high-temperature flue gas entering secondary settling tank is discharged from secondary smoke outlet, is connected bottom secondary settling tank with secondary grain slag separator box by secondary grain slag valve; The outlet of secondary settling tank secondary oil is connected with centrifugal separator by secondary fuel tap, and centrifugal separator oil export is connected with pump, and water is connected with tertiary effluent slag separator box by tertiary effluent slag valve with micro-impurities outlet; Raw material plant is passed out to by impurities outlet through the isolated thick impurity of one-level grain slag separator box, secondary grain slag separator box and tertiary effluent slag separator box, thin impurity and micro-impurity, water sends into water treatment system by water out, and recovered oil is reused by recovered oil outlet.
Present invention also offers a kind of waste oil classification recoverying and utilizing method, the method comprises the steps:
Waste oil enters first grade subsides tank by first grade subsides tank waste oil entrance, and high-temperature flue gas enters first grade subsides tank from first grade subsides tank one-level smoke inlet; The inlet of waste oil is controlled by waste oil valve, and the inlet of high-temperature flue gas is controlled by one-level smoke valve; The mode that the flue of high-temperature flue gas in first grade subsides tank flows through septate heat transfer heats waste oil, and the high-temperature flue gas through heat exchange is discharged from one-level exhanst gas outlet; Waste oil carries out a sedimentation in first grade subsides tank, realizes once oil, water is separated with thick impurity; First grade subsides tank once oil is at the middle and upper levels flowed out by an oil export; The water of first grade subsides Guan Zhong lower floor and thick impurity enter one-level grain slag separator box by one-level grain slag valve under gravity; Once oil enters secondary settling tank by secondary settling tank oil-in, and high-temperature flue gas enters secondary settling tank from secondary settling tank secondary smoke entrance; Once the inlet of oil is controlled by a fuel tap, and the inlet of high-temperature flue gas is controlled by secondary smoke valve; The mode that the flue of high-temperature flue gas in secondary settling tank flows through septate heat transfer heats once oil, and the high-temperature flue gas through heat exchange is discharged from secondary smoke outlet; Once oil carries out secondary settlement in secondary settling tank, realizes secondary oil, water is separated with thin impurity; Secondary settling tank secondary oil is at the middle and upper levels flowed out by secondary oil outlet; In secondary settling tank, the water of lower floor and thin impurity enter secondary grain slag separator box by secondary grain slag valve under gravity; Secondary oil enters centrifugal separator by secondary fuel tap and is finally separated, and secondary oil realizes recovered oil in centrifugal separator, water is separated with micro-impurity; Recovered oil is flowed out from recovered oil outlet by the transport effect of pump; Water and micro-impurity enter tertiary effluent slag separator box by tertiary effluent slag valve; Raw material plant is passed out to by impurities outlet through the isolated thick impurity of one-level grain slag separator box, secondary grain slag separator box and tertiary effluent slag separator box, thin impurity and micro-impurity, water sends into water treatment system by water out, and recovered oil is reused by recovered oil outlet.
Preferably, the column structure height of described first grade subsides tank is h0, and conical structure height is h1, and diameter is d0, and conical structure angle is α, and flue diameter is d1; The height of first grade subsides tank waste oil entrance is positioned at the 0.9h0 place of column structure height, and the height of an oil export is positioned at the 0.45h0 place of column structure height; The sedimentation time of waste oil in first grade subsides tank maintains 8 ~ 10h, and the waste oil temperature in first grade subsides tank is in 30 ~ 40 DEG C; Realize being separated of thick impurity and water in one-level grain slag separator box, thick impurity particle diameter is greater than 500 μm.
Preferably, the column structure height of described secondary settling tank is h0, and conical structure height is 1.1h1 ~ 1.3h1, and diameter is 0.9d0 ~ 1.1d0, and conical structure angle is 1.2 α ~ 1.5 α, and flue diameter is 0.4d1 ~ 0.6d1; The height of a secondary settling tank oil-in is positioned at the 0.5h0 place of column structure height, and the height of secondary oil outlet is positioned at the 0.125h0 place of column structure height; Once the sedimentation time of oil in secondary settling tank maintains 14 ~ 16h, and the waste oil temperature in secondary settling tank is in 70 ~ 80 DEG C; Realize being separated of thin impurity and water in secondary grain slag separator box, the particle diameter of thin impurity is between 100 ~ 500 μm.
Preferably, described centrifugal separator initial speed controls at 500 ~ 800r/min, and follow-up phase is 2000 ~ 2500r/min, and the centrifugation time is 10 ~ 15min; Micro-impurity after centrifugation in secondary oil and moisture removal rate can reach more than 95%, form recovered oil; The particle diameter of micro-impurity is between 20 ~ 100 μm.
Preferably, be evenly arranged multiple flow of flue gas pipeline in described first grade subsides tank and secondary settling tank and guarantee that the waste oil in first grade subsides tank and the once oil in secondary settling tank are heated evenly.
Beneficial effect: compared with prior art, the present invention has following characteristic and advantage:
1. the present invention carries out classification recycling to the waste oil produced in steel industry, realize the oil in waste oil, water is separated with solid impurity, recovered oil can recycle, and water sends into water treatment system, and solid impurity then sends into raw material plant for the technique such as pelletizing and sintering.
2. the present invention utilizes steel plant's existing device or material in waste oil classification recycling process as far as possible, as heating waste oil can adopt high-temperature flue gas, effectively reduces costs.
3. the present invention controls the flow of each component by multiple flow valve, can guarantee isolated operation or the combined running of first grade subsides tank, secondary settling tank and centrifugal separator.
4. applicability of the present invention is comparatively strong, does not have strict restriction to the waste oil component that steel industry produces, simple to operate, with low cost, does not produce secondary pollution, achieves effective recycling of resource, have obvious environmental benefit, economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is a kind of waste oil classification of the present invention recycle device schematic diagram.
Wherein have: waste oil valve 1, one-level smoke valve 2, first grade subsides tank 3, one-level grain slag valve 4, one-level grain slag separator box 5, a fuel tap 6, secondary smoke valve 7, secondary settling tank 8, secondary grain slag valve 9, secondary grain slag separator box 10, secondary fuel tap 11, centrifugal separator 12, tertiary effluent slag valve 13, tertiary effluent slag separator box 14, pump 15, waste oil entrance A1, an oil export A2, an oil-in A3, secondary oil outlet A4, one-level smoke inlet B1, secondary smoke entrance B2, one-level exhanst gas outlet C1, secondary smoke outlet C2, recovered oil outlet E, impurities outlet F, water out G.
Fig. 2 is the structure chart of the settling tank used in the present invention.
Specific embodiments
The realization of technology path of the present invention and target is illustrated below in conjunction with accompanying drawing.
The inventive system comprises waste oil valve 1, one-level smoke valve 2, first grade subsides tank 3, one-level grain slag valve 4, one-level grain slag separator box 5, fuel tap 6, secondary smoke valve 7, secondary settling tank 8, secondary grain slag valve 9, secondary grain slag separator box 10, secondary fuel tap 11, centrifugal separator 12, tertiary effluent slag valve 13, tertiary effluent slag separator box 14 and pump 15.Wherein waste oil valve 1 is connected with first grade subsides tank 3 waste oil entrance A1, one-level smoke valve 2 is connected with first grade subsides tank 3 one-level smoke inlet B1, the high-temperature flue gas entering first grade subsides tank 3 is discharged from one-level exhanst gas outlet C1, is connected bottom first grade subsides tank 3 with one-level grain slag separator box 5 by one-level grain slag valve 4.First grade subsides tank 3 oil export A2 are connected by a fuel tap 6 and secondary settling tank 8 oil-in A3, secondary smoke valve 7 is connected with secondary settling tank 8 secondary smoke entrance B2, the high-temperature flue gas entering secondary settling tank 8 is discharged from secondary smoke outlet C2, is connected bottom secondary settling tank 8 with secondary grain slag separator box 10 by secondary grain slag valve 9.Secondary settling tank 8 secondary oil outlet A4 is connected with centrifugal separator 12 by secondary fuel tap 11, and centrifugal separator 12 oil export is connected with pump 15, and water is connected with tertiary effluent slag separator box 14 by tertiary effluent slag valve 13 with micro-impurities outlet.Raw material plant is passed out to by impurities outlet F through one-level grain slag separator box 5, secondary grain slag separator box 10 and the isolated thick impurity of tertiary effluent slag separator box 14, thin impurity and micro-impurity, water sends into water treatment system by water out G, and recovered oil is reused by recovered oil outlet E.
The implementation method that waste oil classification is recycled: waste oil enters first grade subsides tank 3 by waste oil entrance A1, and the inlet of waste oil is controlled by waste oil valve 1.High-temperature flue gas enters first grade subsides tank 3 from first grade subsides tank 3 one-level smoke inlet B1, and the inlet of high-temperature flue gas is controlled by one-level smoke valve 2.The mode that the flue of high-temperature flue gas in first grade subsides tank 3 flows through septate heat transfer heats waste oil, high-temperature flue gas through heat exchange is discharged from one-level exhanst gas outlet C1, and high-temperature flue gas flow is controlled to guarantee that the waste oil temperature in first grade subsides tank 3 is in 30 ~ 40 DEG C by one-level smoke valve 2.Waste oil carries out a sedimentation in first grade subsides tank 3, realizes once oil, water is separated with thick impurity.First grade subsides tank 3 once oil is at the middle and upper levels flowed out by an oil export A2.In first grade subsides tank 3, the water of lower floor and thick impurity enter one-level grain slag separator box 5 by one-level grain slag valve 4 under gravity, and in one-level grain slag separator box 5, realize being separated of thick impurity and water, thick impurity particle diameter is greater than 500 μm.The sedimentation time of waste oil in first grade subsides tank 3 maintains 8 ~ 10h, and the column structure height of first grade subsides tank 3 is 4m, and diameter is 2m, and conical structure height is 1m, and coning angle is 90 °, and flue diameter is 0.02m.The height of first grade subsides tank 3 waste oil entrance A1 is positioned at the 3.6m place of column structure height, and the height of an oil export A2 is positioned at the 1.8m place of column structure height.
Once oil enters secondary settling tank 8 by an oil-in A3, and once the inlet of oil is controlled by a fuel tap 6.High-temperature flue gas enters secondary settling tank 8 from secondary settling tank 8 secondary smoke entrance B2, and the inlet of high-temperature flue gas is controlled by secondary smoke valve 7.The mode that the flue of high-temperature flue gas in secondary settling tank 8 flows through septate heat transfer heats once oil, high-temperature flue gas through heat exchange is discharged from secondary smoke outlet C2, and high-temperature flue gas flow is controlled to guarantee that an oil temperature in secondary settling tank 8 is in 70 ~ 80 DEG C by secondary smoke valve 7.Once oil carries out secondary settlement in secondary settling tank 8, realizes secondary oil, water is separated with thin impurity.Secondary settling tank 8 secondary oil is at the middle and upper levels flowed out by secondary oil outlet A4.In secondary settling tank, the water of lower floor and thin impurity enter secondary grain slag separator box 10 by secondary grain slag valve 9 under gravity, and in secondary grain slag separator box 10, realize being separated of thin impurity and water, the particle diameter of thin impurity is between 100 ~ 500 μm.Once the sedimentation time of oil in secondary settling tank 8 maintains 14 ~ 16h, and the column structure height of secondary settling tank 8 is 4m, and diameter is 2m, and conical structure height is 1.2m, and coning angle is about 120 °, and flue diameter is 0.01m.The height of secondary settling tank 8 oil-in A3 is positioned at the 2m place of column structure height, and the height of secondary oil outlet A4 is positioned at the 0.5m place of column structure height.
Secondary oil enters centrifugal separator 12 by secondary fuel tap 11 and is finally separated, and secondary oil realizes recovered oil in centrifugal separator 12, water is separated with micro-impurity.Recovered oil is by flowing out from recovered oil outlet E under the transport effect of pump 15.Water and micro-impurity enter tertiary effluent slag separator box 14 by tertiary effluent slag valve 13, realize being separated of micro-impurity and water in tertiary effluent slag separator box 14.Centrifugal separator 12 initial speed controls at 500 ~ 800r/min, and follow-up phase is 2000 ~ 2500r/min, and the centrifugation time is 10 ~ 15min.Micro-impurity after centrifugation in secondary oil and moisture removal rate can reach more than 95%, form recovered oil.The particle diameter of micro-impurity is between 20 ~ 100 μm.
In order to ensure that the waste oil in first grade subsides tank 3 and the once oil in secondary settling tank 8 are heated evenly, in first grade subsides tank 3 and secondary settling tank 8, be evenly arranged multiple flow of flue gas pipeline.In waste oil classification recycling process, provide power by pump 15, guarantee that waste oil flows in whole process.Isolated operation or the combined running that can guarantee first grade subsides tank 3, secondary settling tank 8 and centrifugal separator 12 is controlled by multiple flow valve.
Claims (6)
1. a waste oil classification recycle device, it is characterized in that, this device comprises waste oil valve (1), one-level smoke valve (2), first grade subsides tank (3), one-level grain slag valve (4), one-level grain slag separator box (5), fuel tap (6), secondary smoke valve (7), secondary settling tank (8), secondary grain slag valve (9), secondary grain slag separator box (10), secondary fuel tap (11), centrifugal separator (12), tertiary effluent slag valve (13), tertiary effluent slag separator box (14) and a pump (15); Wherein,
Waste oil valve (1) is connected with first grade subsides tank (3) waste oil entrance (A1), one-level smoke valve (2) is connected with first grade subsides tank (3) one-level smoke inlet (B1), the high-temperature flue gas entering first grade subsides tank (3) is discharged from one-level exhanst gas outlet (C1), and first grade subsides tank (3) bottom is connected by one-level grain slag valve (4) with one-level grain slag separator box (5); First grade subsides tank (3) oil exports (A2) are connected by a fuel tap (6) and secondary settling tank (8) oil-ins (A3), secondary smoke valve (7) is connected with secondary settling tank (8) secondary smoke entrance (B2), the high-temperature flue gas entering secondary settling tank (8) is discharged from secondary smoke outlet (C2), and secondary settling tank (8) bottom is connected by secondary grain slag valve (9) with secondary grain slag separator box (10); Secondary settling tank (8) secondary oil outlet (A4) is connected with centrifugal separator (12) by secondary fuel tap (11), centrifugal separator (12) oil export is connected with pump (15), and water is connected with tertiary effluent slag separator box (14) by tertiary effluent slag valve (13) with micro-impurities outlet (F); Raw material plant is passed out to by impurities outlet (F) through one-level grain slag separator box (5), secondary grain slag separator box (10) and the isolated thick impurity of tertiary effluent slag separator box (14), thin impurity and micro-impurity, water sends into water treatment system by water out (G), and recovered oil is reused by recovered oil outlet (E).
2. a waste oil classification recoverying and utilizing method, is characterized in that, the method comprises the steps:
Waste oil enters first grade subsides tank (3) by first grade subsides tank (3) waste oil entrance (A1), and high-temperature flue gas enters first grade subsides tank (3) from first grade subsides tank (3) one-level smoke inlet (B1); The inlet of waste oil is controlled by waste oil valve (1), and the inlet of high-temperature flue gas is controlled by one-level smoke valve (2); The mode that the flue of high-temperature flue gas in first grade subsides tank (3) flows through septate heat transfer heats waste oil, and the high-temperature flue gas through heat exchange is discharged from one-level exhanst gas outlet (C1); Waste oil carries out a sedimentation in first grade subsides tank (3), realizes once oil, water is separated with thick impurity; First grade subsides tank (3) once oil is at the middle and upper levels flowed out by an oil export (A2); Water and the thick impurity of the middle lower floor of first grade subsides tank (3) enter one-level grain slag separator box (5) by one-level grain slag valve (4) under gravity; Once oil enters secondary settling tank (8) by secondary settling tank (8) oil-ins (A3), and high-temperature flue gas enters secondary settling tank (8) from secondary settling tank (8) secondary smoke entrance (B2); Once the inlet of oil is controlled by a fuel tap (6), and the inlet of high-temperature flue gas is controlled by secondary smoke valve (7); The mode that the flue of high-temperature flue gas in secondary settling tank (8) flows through septate heat transfer heats once oil, and the high-temperature flue gas through heat exchange is discharged from secondary smoke outlet (C2); Once oil carries out secondary settlement in secondary settling tank (8), realizes secondary oil, water is separated with thin impurity; Secondary settling tank (8) secondary oil is at the middle and upper levels flowed out by secondary oil outlet (A4); Water and the thin impurity of the middle lower floor of secondary settling tank (8) enter secondary grain slag separator box (10) by secondary grain slag valve (9) under gravity; Secondary oil enters centrifugal separator (12) by secondary fuel tap (11) and is finally separated, and secondary oil realizes recovered oil in centrifugal separator (12), water is separated with micro-impurity; Recovered oil is flowed out from recovered oil outlet (E) by the transport effect of pump (15); Water and micro-impurity enter tertiary effluent slag separator box (14) by tertiary effluent slag valve (13); Raw material plant is passed out to by impurities outlet (F) through one-level grain slag separator box (5), secondary grain slag separator box (10) and the isolated thick impurity of tertiary effluent slag separator box (14), thin impurity and micro-impurity, water sends into water treatment system by water out (G), and recovered oil is reused by recovered oil outlet (E).
3. waste oil classification recoverying and utilizing method according to claim 2, is characterized in that, the column structure height of described first grade subsides tank (3) is h0, and conical structure height is h1, and diameter is d0, and conical structure angle is α, and flue diameter is d1; The height of first grade subsides tank (3) waste oil entrance (A1) is positioned at the 0.9h0 place of column structure height, and the height of an oil export (A2) is positioned at the 0.45h0 place of column structure height; The sedimentation time of waste oil in first grade subsides tank (3) maintains 8 ~ 10h, and the waste oil temperature in first grade subsides tank (3) is in 30 ~ 40 DEG C; Realize being separated of thick impurity and water in one-level grain slag separator box (5), thick impurity particle diameter is greater than 500 μm.
4. waste oil classification recoverying and utilizing method according to claim 2, it is characterized in that, the column structure height of described secondary settling tank (8) is h0, conical structure height is 1.1h1 ~ 1.3h1, diameter is 0.9d0 ~ 1.1d0, conical structure angle is 1.2 α ~ 1.5 α, and flue diameter is 0.4d1 ~ 0.6d1; The height of secondary settling tank (8) oil-ins (A3) is positioned at the 0.5h0 place of column structure height, and the height of secondary oil outlet (A4) is positioned at the 0.125h0 place of column structure height; Once the sedimentation time of oil in secondary settling tank (8) maintains 14 ~ 16h, and the waste oil temperature in secondary settling tank (8) is in 70 ~ 80 DEG C; Realize being separated of thin impurity and water in secondary grain slag separator box (10), the particle diameter of thin impurity is between 100 ~ 500 μm.
5. waste oil classification recoverying and utilizing method according to claim 2, is characterized in that, described centrifugal separator (12) initial speed controls at 500 ~ 800r/min, and follow-up phase is 2000 ~ 2500r/min, and the centrifugation time is 10 ~ 15min; Micro-impurity after centrifugation in secondary oil and moisture removal rate can reach more than 95%, form recovered oil; The particle diameter of micro-impurity is between 20 ~ 100 μm.
6. waste oil classification recoverying and utilizing method according to claim 2, it is characterized in that, be evenly arranged multiple flow of flue gas pipeline in described first grade subsides tank (3) and secondary settling tank (8) and guarantee that the waste oil in first grade subsides tank (3) and the once oil in secondary settling tank (8) are heated evenly.
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| CN106422433B (en) * | 2016-09-23 | 2018-11-13 | 苏州市浒墅关化工添加剂有限公司 | Solvent type dinonyl naphthalene sulfonate barium is layered continuous sedimentation tank |
| CN106833724A (en) * | 2017-03-22 | 2017-06-13 | 安徽国孚润滑油工业有限公司 | Residual oil continuous sedimentation separator |
| CN107699331B (en) * | 2017-09-18 | 2020-07-28 | 武汉工程大学 | Purification method for grading and impurity removal of waste lubricating oil |
| CN109722285B (en) * | 2017-10-30 | 2021-04-06 | 中国石油化工股份有限公司 | Method for recovering oil from waste clay and method for utilizing recovered oil from waste clay |
| CN113082847B (en) * | 2021-04-01 | 2022-05-27 | 厦门市汉臻能源科技有限公司 | Online circulating dialysis device and method for coal gas bag hydraulic oil in steelmaking production |
| CN115090032A (en) * | 2022-06-20 | 2022-09-23 | 首钢智新迁安电磁材料有限公司 | Online separation and purification device and method for emulsified oil products of twenty-roller reversible rolling mill |
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