CN111411014A - Harmless treatment method for stainless steel rolling oil sludge - Google Patents
Harmless treatment method for stainless steel rolling oil sludge Download PDFInfo
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- CN111411014A CN111411014A CN202010219877.5A CN202010219877A CN111411014A CN 111411014 A CN111411014 A CN 111411014A CN 202010219877 A CN202010219877 A CN 202010219877A CN 111411014 A CN111411014 A CN 111411014A
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- separation
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- centrifuge
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- 239000010731 rolling oil Substances 0.000 title claims abstract description 39
- 239000010802 sludge Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 18
- 239000010935 stainless steel Substances 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 238000000926 separation method Methods 0.000 claims abstract description 47
- 239000003921 oil Substances 0.000 claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 6
- 238000003672 processing method Methods 0.000 claims 5
- 230000003749 cleanliness Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000009969 flowable effect Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
- C10M175/0058—Working-up used lubricants to recover useful products ; Cleaning by filtration and centrifugation processes; apparatus therefor
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Centrifugal Separators (AREA)
Abstract
The invention relates to a harmless treatment method of stainless steel rolling oil sludge, which is characterized by sequentially comprising the following steps of: 1) filtering and stirring the stainless steel rolling oil sludge to form flowing liquid; 2) primary separation: conveying the flowing liquid to a horizontal centrifuge through a slurry pump for primary solid-liquid separation; 3) and (3) secondary separation: conveying the rolling mixed oil subjected to primary separation into a butterfly centrifuge for solid-liquid re-separation; 4) and (3) three times of separation: conveying the rolling oil subjected to secondary separation into a tubular centrifuge for solid-liquid separation; 5) and (3) filtering: and filtering and purifying the rolling oil after the three times of separation for later use. The rolling oil obtained by the treatment method has high oil cleanliness and can be reused, and the whole treatment process is green and environment-friendly without three wastes discharge, thereby achieving the effect of harmless treatment.
Description
Technical Field
The invention belongs to the technical field of treatment and recycling of solid wastes generated in a stainless steel rolling production process, and particularly relates to a harmless treatment method of stainless steel rolling oil sludge.
Background
Because the surface requirement of the cold-rolled stainless steel strip is high, mineral oil is widely adopted for cooling and lubricating the cold-rolled stainless steel strip. The rolling oil takes away scrap iron on the surface of the stainless steel in the cooling and lubricating process. During the recycling process of the rolling oil, the rolling oil is firstly filtered for the first time and the second time, the filter elements are backwashed for the first time and the second time, the backwashed oil enters a residue oil tank for three-stage precipitation, and a solid-liquid mixture (oil sludge) is discharged to a sludge tank under the precipitation. The oil sludge is black and sticky, has high metal content, small particle diameter (micron order), complex components, difficult sedimentation in a natural state and only 10 percent of workshop recycling rate.
Traditionally, oil sludge or oily sludge, such as "three sludge" (scum, residual activated sludge, oil interceptor bottom sludge) in petroleum and petrochemical, crude oil and oil refining industries, has been treated and disposed by mechanical separation, ultrasonic treatment, incineration, utilization of fuels or building materials, landfill, and the like. With the increasing requirement of environmental protection, the traditional treatment method has the problems of environmental pollution, resource waste and hidden danger of pollution transfer to be stored.
For example, the chinese patent application CN201910079158.5 (application publication No. CN109807187A) discloses a method for recycling rolling oil of scrap steel. The method comprises the following steps: (1) mixing and reacting waste steel rolling oil with inorganic acid, layering the obtained reaction mixture, and separating an upper oil phase and a lower salt-containing water phase; (2) distilling the oil phase to separate a fraction with a boiling point below 500 ℃; (3) cooling and crystallizing the salt-containing aqueous phase, and separating out iron salt; the residual oil phase is distilled to extract raw materials for preparing the rolling oil, the rolling oil is distilled and extracted, the environmental pollution is possibly caused greatly, and the oil cleanliness of the extracted rolling oil is low.
Therefore, a harmless treatment method for the stainless steel rolling oil sludge needs to be designed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a harmless treatment method of stainless steel rolling oil sludge with small grain size of rolling oil particles and high oil cleanliness aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a harmless treatment method of stainless steel rolling oil sludge is characterized by sequentially comprising the following steps:
1) filtering and stirring the stainless steel rolling oil sludge to form flowing liquid;
2) primary separation: conveying the flowing liquid to a horizontal centrifuge through a slurry pump for primary solid-liquid separation;
3) and (3) secondary separation: conveying the rolling mixed oil subjected to primary separation into a butterfly centrifuge for solid-liquid re-separation;
4) and (3) three times of separation: conveying the rolling oil subjected to secondary separation into a tubular centrifuge for solid-liquid separation;
5) and (3) filtering: and filtering and purifying the rolling oil after the three times of separation for later use.
Preferably, the slurry pump delivers and breaks up solid particles in the flowing liquid to a particle size of 1mm at a rate of 500 to 1000 litres per hour.
Preferably, the liquid oil sludge separated in step 3) is conveyed to step 2) for solid-liquid separation, and the rolling mixed oil separated in step 2) is conveyed to a butterfly centrifuge in step 3) for solid-liquid separation. In this way, the separated liquid sludge can be subjected to rolling oil.
In order to make the particle size of the rolling oil smaller, preferably, the rotation speed of the horizontal centrifuge is 5000r/min, the rotation speed of the butterfly centrifuge is 10000r/min, and the rotation speed of the tubular centrifuge is 14000 r/min.
Specifically, the particle size of solid particles of the rolling mixed oil after primary separation is 5-10 um.
Specifically, the slag content of the rolling oil after the secondary separation is less than 1%. Therefore, the oil cleanliness of the rolling oil is high.
Compared with the prior art, the invention has the advantages that: the stainless rolling oil sludge is filtered and stirred to form a flowable liquid, and then the flowable liquid is sequentially conveyed to a horizontal centrifuge, a butterfly centrifuge and a tubular centrifuge for solid-liquid separation, and then the solid-liquid separation is carried out, so that the obtained rolling oil has high oil cleanliness and can be reused, the whole treatment process is green and environment-friendly, no three wastes are discharged, and the effect of harmless treatment is achieved.
Drawings
FIG. 1 is a flow chart of a method for harmless treatment of stainless steel rolling sludge according to an embodiment of the present invention
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the method for treating stainless steel rolling sludge to make it harmless in this embodiment sequentially comprises the following steps:
1) filtering and stirring the stainless steel rolled oil sludge in an oil sludge collector, and forming flowing liquid after uniformly stirring;
2) primary separation: in the process of conveying flowing liquid through a slurry pump at a flow rate of 500-1000 liters per hour, solid particles in the flowing liquid can be crushed to a particle size of 1mm, the crushed flowing liquid is conveyed into a horizontal centrifuge through a funnel, the rotating speed of the horizontal centrifuge is 5000r/min, the flowing liquid is subjected to solid-liquid primary separation, and after primary separation, the particle size of the flowing liquid is reduced by 80%, so that the particle size of the solid particles of the obtained rolling mixed oil is reduced, and the particle size of the solid particles is 5-10 um;
in addition, solids accumulated in the drum of the horizontal centrifuge are disassembled after the centrifuge is stopped, the drum is manually removed, or the solids are discharged from the drum through a slag discharge mechanism under the condition of no stop, waste residues enter the horizontal centrifuge to continue circulation, and oil enters the next working procedure;
3) and (3) secondary separation: conveying the rolling mixed oil separated by the horizontal centrifuge into a butterfly centrifuge, carrying out solid-liquid re-separation on the rolling mixed oil by the butterfly centrifuge at the rotating speed of 10000r/min, wherein the slag content of the rolling oil separated by the butterfly centrifuge is less than 1%;
4) and (3) three times of separation: conveying the rolling oil separated by the butterfly centrifuge into a tubular centrifuge, and carrying out solid-liquid separation on the rolling oil by the tubular centrifuge at the rotating speed of 14000 r/min;
5) and (3) filtering: and filtering and purifying the rolling oil separated by the tubular centrifuge through an oil filter of a high-precision filter element for later use.
In addition, in step 3), the liquid sludge after the secondary separation is conveyed to the horizontal separator in step 2) for solid-liquid separation, and step 3), step 4, and step 5) are sequentially performed.
After the treatment by the treatment method, the diameter of liquid particles of the regenerated rolling oil is less than 0.5 mu m, the oil cleanliness is in NAS 6-7 level, the physical treatment method is adopted in the whole treatment process, under the premise of ensuring that the physicochemical indexes of the oil reach the oil utilization indexes, the separated solid waste (or solid mud) is greatly reduced in liquid phase, the oil content is further reduced under the action of a squeezer to form a cake-shaped solid, and the cake-shaped solid can be recovered by a metal resource recovery treatment plant to realize the metal resource recycling.
The working principle of the horizontal centrifuge of the embodiment is as follows:
the rotary drum and the spiral in the horizontal centrifuge rotate at a high speed in the same direction at a certain differential speed, materials are continuously introduced into the inner cylinder of the material conveying spiral through the material inlet pipe, enter the rotary drum after being accelerated, and heavy solid-phase substances are deposited on the wall of the rotary drum to form a slag layer under the action of a centrifugal force field; the conveying screw continuously pushes deposited solid-phase substances to the conical end of the rotary drum and discharges the solid-phase substances out of the machine through the slag discharge port, and lighter liquid-phase substances form an inner-layer liquid ring and continuously overflow the rotary drum from the overflow port at the large end of the rotary drum and are discharged out of the machine through the liquid discharge port.
The working principle of the butterfly centrifuge is as follows: a set of disk-shaped parts (namely disks) which are mutually sleeved together are arranged in a rotary drum of the butterfly centrifuge. A small gap is left between the discs; the suspension (or emulsion) is fed into the rotary drum from a feeding pipe positioned in the center of the rotary drum, and when the suspension (or emulsion) flows through the gaps between the discs, the solid particles (or liquid drops) are settled on the discs under the action of a centrifugal machine to form a sediment (or liquid layer); then, the sediment slides along the surface of the disc to be separated from the disc and accumulated on the part with the largest inner diameter of the rotary drum, and the separated liquid is discharged out of the rotary drum from the liquid outlet. The disc has the functions of shortening the settling distance of solid particles (or liquid drops) and expanding the settling area of the rotary drum, and the production capacity of the separator is greatly improved due to the disc arranged in the rotary drum.
The working principle of the tubular centrifuge is as follows: the suspension liquid enters from the central position of the bottom of a rotary drum of the tubular centrifuge, under the action of centrifugal force, the solid with higher density is rapidly settled on the inner side of the rotary drum to form a solid layer, and the clarified liquid is positioned at the central shaft position of the rotary drum.
Horizontal centrifuge, butterfly centrifuge and tubular centrifuge in this embodiment all adopt the centrifuge that corresponds among the prior art, will not be repeated in detail in this application.
Claims (6)
1. A harmless treatment method of stainless steel rolling oil sludge is characterized by sequentially comprising the following steps:
1) filtering and stirring the stainless steel rolling oil sludge to form flowing liquid;
2) primary separation: conveying the flowing liquid to a horizontal centrifuge through a slurry pump for primary solid-liquid separation;
3) and (3) secondary separation: conveying the rolling mixed oil subjected to primary separation into a butterfly centrifuge for solid-liquid re-separation;
4) and (3) three times of separation: conveying the rolling oil subjected to secondary separation into a tubular centrifuge for solid-liquid separation;
5) and (3) filtering: and filtering and purifying the rolling oil after the three times of separation for later use.
2. The processing method according to claim 1, characterized in that: the slurry pump conveys the slurry at a flow rate of 500-1000 liters per hour and breaks solid particles in the flowing liquid to a particle size of 1 mm.
3. The processing method according to claim 1, characterized in that: and (3) conveying the liquid oil sludge separated in the step 3) to the step 2) for solid-liquid separation, and conveying the rolling mixed oil separated in the step 2) to a butterfly centrifuge in the step 3) for solid-liquid separation.
4. The processing method according to claim 1, characterized in that: the rotating speed of the horizontal centrifuge is 5000r/min, the rotating speed of the butterfly centrifuge is 10000r/min, and the rotating speed of the tubular centrifuge is 14000 r/min.
5. The processing method according to claim 4, characterized in that: the solid particle size of the rolling mixed oil after primary separation is 5-10 um.
6. The processing method according to claim 4, characterized in that: the slag content of the rolling oil after the secondary separation is less than 1 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010219877.5A CN111411014A (en) | 2020-03-25 | 2020-03-25 | Harmless treatment method for stainless steel rolling oil sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010219877.5A CN111411014A (en) | 2020-03-25 | 2020-03-25 | Harmless treatment method for stainless steel rolling oil sludge |
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| Publication Number | Publication Date |
|---|---|
| CN111411014A true CN111411014A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010219877.5A Pending CN111411014A (en) | 2020-03-25 | 2020-03-25 | Harmless treatment method for stainless steel rolling oil sludge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114933400A (en) * | 2022-05-11 | 2022-08-23 | 国家石油天然气管网集团有限公司 | Oil sludge harmless treatment device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0931486A (en) * | 1995-07-21 | 1997-02-04 | Mitsubishi Kakoki Kaisha Ltd | Purification of rolling oil |
| CN101993771A (en) * | 2009-08-13 | 2011-03-30 | 广州宝维纳环保科技有限公司 | Regeneration technology of single-grade far infrared type heating molecule distillation used oil |
| CN104402983A (en) * | 2014-12-11 | 2015-03-11 | 山东省科学院生物研究所 | Method for extracting glycoprotein by utilizing sea cucumber treatment blanching liquid and application thereof |
| CN205133371U (en) * | 2015-11-27 | 2016-04-06 | 广州中万环保科技有限公司 | Industry fatlute is handled and waste oil recovery system |
| CN106147978A (en) * | 2015-04-27 | 2016-11-23 | 宝钢不锈钢有限公司 | For rolling device and the using method thereof of greasy filth solid-liquid separation and resource reclaim |
| CN107935352A (en) * | 2017-12-29 | 2018-04-20 | 天津绿业石化环保装备有限公司 | A kind of new oily sludge water treatment facilities |
-
2020
- 2020-03-25 CN CN202010219877.5A patent/CN111411014A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0931486A (en) * | 1995-07-21 | 1997-02-04 | Mitsubishi Kakoki Kaisha Ltd | Purification of rolling oil |
| CN101993771A (en) * | 2009-08-13 | 2011-03-30 | 广州宝维纳环保科技有限公司 | Regeneration technology of single-grade far infrared type heating molecule distillation used oil |
| CN104402983A (en) * | 2014-12-11 | 2015-03-11 | 山东省科学院生物研究所 | Method for extracting glycoprotein by utilizing sea cucumber treatment blanching liquid and application thereof |
| CN106147978A (en) * | 2015-04-27 | 2016-11-23 | 宝钢不锈钢有限公司 | For rolling device and the using method thereof of greasy filth solid-liquid separation and resource reclaim |
| CN205133371U (en) * | 2015-11-27 | 2016-04-06 | 广州中万环保科技有限公司 | Industry fatlute is handled and waste oil recovery system |
| CN107935352A (en) * | 2017-12-29 | 2018-04-20 | 天津绿业石化环保装备有限公司 | A kind of new oily sludge water treatment facilities |
Non-Patent Citations (2)
| Title |
|---|
| 陈敏恒等: "《化工原理（少学时）（第三版）》", 31 March 2019 * |
| 马海乐 主编: "《食品机械与设备》", 31 January 2004, 中国农业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114933400A (en) * | 2022-05-11 | 2022-08-23 | 国家石油天然气管网集团有限公司 | Oil sludge harmless treatment device |
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Application publication date: 20200714 |
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