CN106809936B - Air floatation cleaning and deoiling system and method for hot rolling advection tank - Google Patents
Air floatation cleaning and deoiling system and method for hot rolling advection tank Download PDFInfo
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- CN106809936B CN106809936B CN201510870457.2A CN201510870457A CN106809936B CN 106809936 B CN106809936 B CN 106809936B CN 201510870457 A CN201510870457 A CN 201510870457A CN 106809936 B CN106809936 B CN 106809936B
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- 238000005098 hot rolling Methods 0.000 title claims abstract description 20
- 238000004140 cleaning Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 119
- 238000009826 distribution Methods 0.000 claims abstract description 23
- 238000007790 scraping Methods 0.000 claims abstract description 15
- 238000005188 flotation Methods 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 124
- 229910052742 iron Inorganic materials 0.000 claims description 61
- 239000007788 liquid Substances 0.000 claims description 19
- 239000012459 cleaning agent Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 239000002699 waste material Substances 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 11
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 119
- 239000010802 sludge Substances 0.000 description 24
- 239000007789 gas Substances 0.000 description 11
- 239000002994 raw material Substances 0.000 description 10
- 238000005245 sintering Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010731 rolling oil Substances 0.000 description 5
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- 239000003517 fume Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012208 gear oil Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- Physical Water Treatments (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses an air-flotation cleaning and deoiling system of a hot-rolling advection pool, which comprises an overflow weir and an oil baffle plate at one side of the advection pool, an oil skimming machine and an oil and slag scraping machine at the upper part, a water distribution wall at the other side and a mud bucket at the bottom; a stirrer is arranged between the water inlet of the advection pool and the water distribution wall; a dissolved air water releaser is respectively arranged between the water distribution wall and the stirrer and in the advection pool, the dissolved air water releaser is connected with an air dissolving device, and the air dissolving device is provided with an air compressor and a centrifugal pump; the cyclone well is connected with the inlet of the advection pool, and a dosing device is arranged above the cyclone well.
Description
Technical Field
The invention belongs to the field of solid waste utilization of iron and steel enterprises, and particularly relates to an air floatation cleaning and deoiling system and an air floatation cleaning and deoiling method for a hot rolling advection tank.
Background
A large amount of lubricating oil, lubricating grease, gear oil and hydraulic oil are consumed in the steel hot rolling process of an iron and steel enterprise, one part of the lubricating oil, the lubricating grease, the gear oil and the hydraulic oil is leaked into a turbid circulating water system, iron scales peeled off from steel are flushed into a trench by turbid circulating water and then are converged into a cyclone well, coarse iron scales are periodically fished out after being precipitated by the cyclone well, the coarse iron scales can be directly used as sintering raw materials due to low oil content, fine iron scales are brought into a horizontal flow tank by water, oil films are attached to the surfaces of the fine iron scales, and the fine iron scales and part of suspended matters are grabbed out by a grab bucket after being precipitated by the horizontal flow tank. The hot rolling oil sludge has high oil content, the oil content after dehydration is generally 5-28% (mass ratio), the total iron content is generally 65-70% (mass ratio), the iron content is higher than that of fine iron powder, the hot rolling oil sludge has high recycling value, oil smoke is generated during roasting of the hot rolling oil sludge without oil removal, the peculiar smell of the oil smoke pollutes the environment and seriously harms the health of operating personnel, and the oil-containing material is not allowed to be directly used without oil removal by national environmental protection regulations. If the yield of hot rolling oil sludge of a certain large-scale steel production enterprise reaches tens of thousands of tons every year, the stockpiling not only occupies a large stock ground, but also seriously pollutes the environment. Iron and steel enterprises and research units at home and abroad carry out a lot of research on the utilization method of the hot-rolled oil sludge, but the technology with small investment, low treatment cost and environment-friendly treatment process is almost not available. The traditional hot rolling oil sludge treatment method comprises the following steps:
(1) a roasting method: the oil sludge is roasted in a shaft furnace or a rotary kiln, although the method can remove oil in the oil sludge, a large amount of energy is consumed, and the oil fume generated in the production process causes heavy secondary pollution to air. (2) A thermal reduction method: the reducing agent and the oil sludge are mixed and canned, and the mixture is heated in a tunnel kiln to produce the reduced iron powder. (3) A distillation method: the method comprises the steps of heating and dehydrating oil sludge, heating in a sealing device to volatilize oil in the oil sludge to form hot oil fume, cooling the fume by sprayed cold oil to form recyclable waste oil, and utilizing iron scale after deoiling as a sintering raw material. The method has complex deoiling process and high equipment investment. (4) Vacuum method: US patent (US5964045) proposes drying and dewatering of oil sludge by introducing hot flue gas at 250 ℃ into a rotary kiln and then vacuum de-oiling of oil sludge at 300 ℃ using a two-stage vacuum drying apparatus. The method is easy to evaporate the waste oil and the water simultaneously, so that the waste oil is bonded with the dust remover, the operation of the dust remover is influenced, the dust removing effect is reduced, and the vacuum deoiling increases the production cost. (5) A hot cleaning method: the hot-rolled oil sludge, the alkaline cleaning agent and the water are heated to 70-90 ℃ in a stirring pot, the mixture is stirred for a certain time, oil in the oil sludge floats on the liquid surface under the action of mechanical force and chemical force, and the waste oil is collected through an oil overflow tank and then sold to an oil refinery. The method has the disadvantages of high energy consumption, high consumption of cleaning agent and high deoiling cost. (6) Normal temperature cleaning method: chengxiao published 'research on degreaser for rolled steel iron scales' in 2006, 3 rd period of "Corrosion science and protection technology", and reported that the cost of the degreaser for rolled steel is high, a large amount of waste water is generated, and sewage treatment is required to be further performed, and the cost of oil sludge treatment is increased.
Disclosure of Invention
Aiming at the defects, the invention provides an air floatation cleaning and deoiling system and an air floatation cleaning and deoiling method for oily turbid water of a hot rolling advection pool, wherein the oil on the surface of fine iron scale, the oil in water and suspended matters in water are removed by a method combining stirring air floatation and chemical adding cleaning for the inflow water of the advection pool, so that the aim of removing the oil in oil sludge is fulfilled, the iron scale after deoiling can be used as a sintering raw material, the recovered waste oil is sold to an oil refinery, the turbid circulating water quality is improved, the filter material consumption is reduced, and the overhaul period of a filter tank is prolonged.
The invention is realized by the following method:
an air floatation cleaning and deoiling system for a hot rolling advection pool comprises an overflow weir and an oil baffle plate at one side of the advection pool, an oil skimming machine and an oil and slag scraping machine at the upper part, a water distribution wall at the other side and a mud bucket at the bottom; the method is characterized in that: a stirrer is arranged between the water inlet of the advection pool and the water distribution wall; a dissolved air water releaser is respectively arranged between the water distribution wall and the stirrer and in the advection pool, the dissolved air water releaser is connected with an air dissolving device, and the air dissolving device is provided with an air compressor and a centrifugal pump; a rotational flow well is additionally arranged and is connected with an inlet of the advection pool through a pipeline, and a dosing device is arranged above the rotational flow well.
A deoiling method of a hot rolling advection pool air floatation cleaning deoiling system is characterized by comprising the following steps: adding a cleaning agent into the cyclone well at a dosing device; the cleaning agent is a mixture of anionic polyacrylamide PAM and water; the cleaning agent and the fine iron scale containing oil in the cyclone well and attached with an oil film on the surface are subjected to chemical reaction, and the oil stain is brought to the liquid level by the cleaning agent; the coarse iron scale particles are fished out after being precipitated by the cyclone well, and the fine iron scale particles and suspended impurities with oil films attached to the surfaces are brought to the water inlet of the advection pool together by water; stirring oil in turbid water and fine iron scale with oil film on surface by stirrer, and distributing waterThe wall water inlet hole enters the advection pool, and the oil film part on the surface of the fine iron scale can enter the water to form suspended oil drops by stirring; the centrifugal pump enables part of water overflowing from the overflow weir and pressure air generated by the air compressor to enter the air dissolving device together to form air dissolving water containing micron-sized bubbles; the water oil drops are floated to the surface of the advection pool through micron-sized bubbles generated by a dissolved gas releaser distributed in water, oil on the liquid surface is scraped between an oil baffle plate and an overflow weir by an upper scraper of an oil and slag scraper, and waste oil is collected to a storage tank by an oil skimming machine; after the deoiling fine iron scales precipitated at the bottom of the advection pool are pushed into a mud bucket by a lower scraper of the oil and slag scraping machine; the air flotation parameters comprise: the air suction quantity, the reflux ratio, the gas-liquid ratio and the gas pressure are controlled within the following ranges: air intake: 0.3L/(m)3Water ∙ min) -0.7L/(m)3Water ∙ min), reflux ratio: 10-25%, gas-liquid ratio: 1.0% -2.5%, gas pressure: 0.4MPa to 0.8 MPa.
The stirring enables oil on the surface of the iron scale in the incoming water to be stripped into the water, prolongs the sinking time of the iron scale, ensures that the oil on the surface of the iron scale can be fully stripped into the water, and creates conditions for achieving the oil sludge deoiling effect.
It is worth mentioning that the setting position of the dissolved air water releaser in the advection pool does not influence the target mud scraping at the lower part of the oil and slag scraper.
The invention has the beneficial effects that: the established advection pool is used for reconstruction, a special oil sludge treatment production line is not required to be built, the investment and operation cost is saved, and the oil removal cost is low. The wet degreasing process is adopted, the degreasing process is environment-friendly, and no secondary pollution is generated. The oil and the iron scale in the oil sludge can be separated by stirring, air flotation and cleaning methods only by a small amount of cleaning agent for the turbid water containing more oil, the iron scale after deoiling can be directly used as a sintering raw material, and the recovered waste oil is sold to oil refining enterprises. The oil sludge of iron and steel production enterprises is changed into valuable, and considerable environmental benefit and social benefit are brought to the enterprises.
Drawings
FIG. 1 is a schematic diagram of an air floatation cleaning and deoiling system of a hot rolling advection pool.
In the figure: 1 overflow weir 2 oil baffle 3 oil skimming machine 4 oil scraping slag scraping machine 5 water distribution wall 6 mixer 7 dissolved gas releaser 8 air compressor 9 centrifugal pump 10 dissolved gas device 11 mud bucket 12 cyclone well 13 dosing device.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1: an air floatation cleaning and deoiling system of a hot rolling advection pool comprises an overflow weir 1 and an oil baffle 2 at one side of the advection pool, an oil skimming machine 3 and an oil and slag scraping machine 4 at the upper part, a water distribution wall 5 at the other side and a mud bucket 11 at the bottom; a stirrer 6 is arranged between the water inlet of the advection pool and the water distribution wall 5; a dissolved air water releaser 7 is respectively arranged between the water distribution wall 5 and the stirrer 6 and in the advection pool, the dissolved air water releaser 7 is connected with an air dissolving device 10, and the air dissolving device 10 is provided with an air compressor 8 and a centrifugal pump 9; an additional cyclone well 12 is connected with the inlet of the advection pool, and a dosing device 13 is arranged above the cyclone well 12.
Example 1:
the amount of circulating water per hour was 3000m3According to the hot-rolling advection pool, 2.4kg of PAM is uniformly added into a cyclone well every hour from a dosing device 13 at the upper part of the cyclone well, coarse-particle iron scale is sunk into the bottom of the cyclone well and taken out periodically as a sintering raw material, turbid water containing fine iron scale, impurities and waste oil is lifted to a water inlet of the advection pool through a lift pump, a stirrer 6 is arranged between the water inlet of the advection pool and a water distribution wall 5, oil on the surface of the fine iron scale in water is stripped into the water by stirring the incoming water, meanwhile, the subsidence time of the iron scale is prolonged, and the oil on the surface of the fine iron scale can be fully stripped into the water. Dissolved air water generated by the dissolved air device 10 aerates incoming water through a dissolved air water releaser 7 arranged between a water distribution 5 wall and a stirrer, micron-sized bubbles adhere to partial oil and impurities suspended in the water and float to the liquid level, PAM is added to contribute to the formation of flocs, and the air flotation oil removal effect is enhanced. The water continuously enters the advection pool through the water distribution wall, the micro bubbles released by the dissolved gas water releaser 7 in the advection pool continuously aerate, and the other part of oil and impurities float to the liquid level. The air flotation parameters are as follows: air intake: 0.3L/(m3 water ∙ min), reflux ratio: 15%, gas-liquid ratio: 1.0%, gas pressure: 0.4 MPa. After deoiling by the above methodAfter being grabbed by a grab bucket, the oil content of the iron scale is 4.2 percent, the oil content of the original oil sludge is 23 percent, and the oil content of the iron scale after being deoiled is 7.8 percent under the condition of the same air flotation parameter without adding chemicals, so that the oil content of the iron scale after being deoiled can be less than 5 percent by adding the chemicals, and the standard of being used as a sintering raw material can be achieved. Waste oil on the surface of the advection pool is collected by an oil scraping and residue scraping machine 4 and an oil skimming machine 3, and is sold to an oil refinery after being stored in a storage tank.
Example 2:
the amount of circulating water per hour was 3000m3According to the hot-rolling advection pool, 3kg of PAM is uniformly added into a cyclone well every hour from a dosing device 13 at the upper part of the cyclone well, coarse-particle iron scale is sunk at the bottom of the cyclone well and taken out periodically as a sintering raw material, turbid water containing fine iron scale, impurities and waste oil is lifted to a water inlet of the advection pool through a lift pump, and a stirrer 6 is arranged between the water inlet of the advection pool and a water distribution wall 5 for stirring to strip oil on the surface of the fine iron scale in incoming water into the water, and stirring also prolongs the sinking time of the iron scale, so that the oil on the surface of the fine iron scale can be fully stripped into the water. Dissolved air water generated by the dissolved air device 10 aerates incoming water through a dissolved air water releaser 7 arranged between the water distribution wall 5 and the stirrer 6, micron-sized bubbles adhere to partial oil and impurities suspended in the water and float to the liquid level, PAM is added to contribute to the formation of flocs, and the air flotation oil removal effect is enhanced. The water continuously enters the advection pool through the water distribution wall 5, the micro bubbles released by the dissolved gas water releaser 7 in the advection pool continuously aerate, and the oil and the impurities float to the liquid level. The air flotation parameters are as follows: air intake: 0.6L/(m3 water ∙ min), reflux ratio: 10%, gas-liquid ratio: 1.5%, gas pressure: 0.6 MPa. The oil content of the iron scale after being deoiled by the method is 4.6 percent after being grabbed by a grab bucket, the oil content of original oil sludge is 25 percent, the oil content of the iron scale after being deoiled under the condition of not adding the chemicals with the same air flotation parameters is 8.6 percent, and the oil content of the iron scale after being deoiled can be less than 5 percent by adding the chemicals, namely the iron scale reaches the standard used as a sintering raw material. Waste oil on the surface of the advection pool is collected by an oil scraping and residue scraping machine 4 and an oil skimming machine 3, and is sold to an oil refinery after being stored in a storage tank.
Example 3:
the amount of circulating water per hour was 3000m3Hot rolling of the advection pool of2.9kg of PAM is uniformly added into the cyclone well by the chemical adding device 13 at the upper part of the cyclone well every hour, coarse-particle iron scale is sunk into the bottom of the cyclone well and taken out periodically as a sintering raw material, turbid water containing fine iron scale, impurities and waste oil is lifted to a water inlet of an advection pool by a lift pump, and a stirrer 6 is arranged between the water inlet of the advection pool and a water distribution wall 5 for stirring to strip oil on the surface of the fine iron scale in incoming water into the water, and simultaneously stirring also prolongs the sinking time of the iron scale, so that the oil on the surface of the fine iron scale can be fully stripped into the water. Dissolved air water generated by the dissolved air device 10 aerates incoming water through a dissolved air water releaser 7 arranged between the water distribution wall 5 and the stirrer, micron-sized bubbles adhere to partial oil and impurities suspended in the water and float to the liquid level, PAM is added to contribute to the formation of flocs, and the air flotation oil removal effect is enhanced. The water continuously enters the advection pool through the water distribution wall 5, the micro bubbles released by the dissolved gas water releaser 7 in the advection pool continuously aerate, and the oil and the impurities float to the liquid level. The air flotation parameters are as follows: air intake: 0.5L/(m3 water ∙ min), reflux ratio: 25%, gas-liquid ratio: 2.5%, gas pressure: 0.8 MPa. After being grabbed out by a grab bucket, the oil content of the iron scale after being deoiled by the method is 4.3 percent, the oil content of original oil sludge is 24 percent, the oil content of the iron scale after being deoiled under the condition of not adding the chemicals with the same air flotation parameters is 8.2 percent, and the oil content of the iron scale after being deoiled can be enabled to be less than 5 percent by adding the chemicals, namely the iron scale reaches the standard used as a sintering raw material. Waste oil on the surface of the advection pool is collected by an oil scraping and residue scraping machine 4 and an oil skimming machine 3, and is sold to an oil refinery after being stored in a storage tank.
Claims (2)
1. An air floatation cleaning and deoiling system for a hot rolling advection pool comprises an overflow weir and an oil baffle plate at one side of the advection pool, an oil skimming machine and an oil and slag scraping machine at the upper part, a water distribution wall at the other side and a mud bucket at the bottom; the method is characterized in that: a stirrer is arranged between the water inlet of the advection pool and the water distribution wall, and the stirrer is used for stirring to ensure that the oil film part on the surface of the thin iron scale enters the water to form suspended oil drops; a dissolved air water releaser is respectively arranged between the water distribution wall and the stirrer and in the advection pool, the dissolved air water releaser is connected with an air dissolving device, and the air dissolving device is provided with an air compressor and a centrifugal pump; a swirl well is additionally arranged and is connected with a water inlet of the advection pool through a pipeline, a dosing device is arranged above the swirl well, and a cleaning agent is added into the swirl well through the dosing device; the cleaning agent and oil in the cyclone well and the fine iron scale with the oil film on the surface are subjected to chemical reaction, and the oil stain is brought to the liquid surface by the cleaning agent.
2. The deoiling method for the hot rolling advection pool air floatation cleaning deoiling system according to claim 1, is characterized in that: adding a cleaning agent into the cyclone well through a dosing device; the cleaning agent is a mixture of anionic polyacrylamide PAM and water; the cleaning agent and oil in the cyclone well and fine iron scale with oil film on the surface are subjected to chemical reaction, and the oil stain is brought to the liquid level by the cleaning agent; the coarse iron scale particles are fished out after being precipitated in the cyclone well, and the fine iron scale particles with the oil film attached to the surface and other suspended impurities are brought to the water inlet of the advection pool together by water; stirring the oil in the turbid water and the fine iron scales with the oil films attached to the surfaces by a stirrer, and then feeding the stirred oil into the advection pool through water inlet holes of the water distribution wall, and stirring to ensure that the oil films on the surfaces of the fine iron scales enter the water to form suspended oil drops; part of water overflowing from the overflow weir enters the gas dissolving device together with pressure air generated by the air compressor through the centrifugal pump to form gas dissolving water containing micron-sized bubbles; oil drops are floated to the surface of the advection pool through micron-sized bubbles generated by a dissolved gas water releaser distributed in water, oil on the liquid surface is scraped between an oil baffle plate and an overflow weir by an upper scraper of an oil and slag scraper, and waste oil is collected to a storage tank by an oil skimmer; after oil is removed, the fine iron scales precipitated at the bottom of the advection pool are pushed into a mud bucket by a lower scraper of the oil and slag scraping machine; the air flotation parameters comprise: the air suction quantity, the reflux ratio, the gas-liquid ratio and the gas pressure are controlled within the following ranges: air intake: 0.3L/(m)3∙ min (min) to 0.7L/(m) of water3Water ∙ min), reflux ratio: 10% -25%, gas-liquid ratio: 1.0% -2.5%, gas pressure: 0.4MPa to 0.8 MPa.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101088942A (en) * | 2006-06-14 | 2007-12-19 | 中国科学院生态环境研究中心 | A treatment process for oily sludge |
| CN104649563A (en) * | 2013-11-25 | 2015-05-27 | 中国石油化工股份有限公司 | Oily sludge advanced treatment technology |
| CN204714674U (en) * | 2015-05-29 | 2015-10-21 | 唐鸿芳 | A kind for the treatment of unit of steel rolling greasy filth |
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| JP5128417B2 (en) * | 2008-08-21 | 2013-01-23 | 株式会社エステム | Oil-containing wastewater treatment method |
| CN102583615A (en) * | 2012-02-09 | 2012-07-18 | 辽宁华孚环境工程有限公司 | Method modifying horizontal flow sedimentation tank into sedimentation floatation tank and modified sedimentation floatation tank |
| CN204454683U (en) * | 2015-03-10 | 2015-07-08 | 吴明擁 | A kind of horizontal flow air flotation device for separating of emulsification suspended solid sewage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101088942A (en) * | 2006-06-14 | 2007-12-19 | 中国科学院生态环境研究中心 | A treatment process for oily sludge |
| CN104649563A (en) * | 2013-11-25 | 2015-05-27 | 中国石油化工股份有限公司 | Oily sludge advanced treatment technology |
| CN204714674U (en) * | 2015-05-29 | 2015-10-21 | 唐鸿芳 | A kind for the treatment of unit of steel rolling greasy filth |
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