CN115745366A - Device and method for treating sludge in rolling line in steel industry - Google Patents
Device and method for treating sludge in rolling line in steel industry Download PDFInfo
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- CN115745366A CN115745366A CN202211385347.3A CN202211385347A CN115745366A CN 115745366 A CN115745366 A CN 115745366A CN 202211385347 A CN202211385347 A CN 202211385347A CN 115745366 A CN115745366 A CN 115745366A
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- sludge
- water
- rolling line
- steel industry
- oil
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- 239000010802 sludge Substances 0.000 title claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000005096 rolling process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003921 oil Substances 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 7
- 238000005119 centrifugation Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 74
- 229910052742 iron Inorganic materials 0.000 claims description 30
- 238000007885 magnetic separation Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 10
- 239000000295 fuel oil Substances 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 239000002351 wastewater Substances 0.000 claims description 7
- 238000005097 cold rolling Methods 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000011343 solid material Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000005245 sintering Methods 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002920 hazardous waste Substances 0.000 description 3
- 239000010731 rolling oil Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 231100000584 environmental toxicity Toxicity 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to the field of rolling line sludge treatment, in particular to a device and a method for treating rolling line sludge in the steel industry. The device comprises a crusher, a stirrer, an ultrasonic processor and a three-phase centrifugal device which are sequentially connected, wherein the three-phase centrifugal device is provided with a water outlet, an oil outlet and a slag outlet, and the water outlet is communicated with a water inlet of the stirrer; the method comprises the following steps: the sludge of the steel rolling line is firstly crushed and then stirred and tempered by adding water; carrying out ultrasonic treatment on the tempered sludge; and performing three-phase centrifugation on the product after ultrasonic treatment to obtain three products of water, oil and solid substances. The treatment technology of the invention has obvious environmental protection benefit, economic benefit and social benefit: the solid substance treated by the method can be used as a sintering raw material to participate in proportioning, water is recycled by 100%, and oil can be sold or used additionally as a product, so that the recycling and harmless utilization of rolling line sludge are realized.
Description
Technical Field
The invention relates to the field of rolling line sludge treatment, in particular to a device and a method for treating rolling line sludge in the steel industry.
Background
At present, the total amount of various oily sludge generated in China every year reaches more than 1000 ten thousand tons, wherein the sludge generated in the steel industry accounts for more than 30 percent. There are two main types of rolling line sludge in the ferrous metallurgy industry, one is hot rolling sludge: a large amount of iron scale is generated in the production process of a hot rolling plant, the iron scale, lubricating oil and lubricating grease consumed in the hot rolling process are flushed into a cyclone well by cooling water, and coarse-particle iron scale is fished out after being precipitated; fine iron scale particles, suspended impurities and turbid water containing oil droplets, which are attached with an oil film on the surface, are lifted to the advection pool through the cyclone well, most of the fine iron scale particles and the impurities, which are attached with the oil film on the surface, are precipitated in the advection pool to form hot rolling oil sludge, and the sludge contains high iron and water content and high viscosity; the other is cold rolling sludge (containing rolling sludge, grinding sludge, acid-containing sludge and alkali-containing sludge): during the rolling and cleaning of cold-rolled steel strip, a large amount of iron-containing sludge is produced. The oil sludge is black slurry and has obvious fluidity, which brings great difficulty to loading and outward transportation treatment. The oil sludge comprises: water, oil, iron powder, dust and other solids. Contains a large amount of iron powder with high recovery value, and the grease at the cold rolling section is mostly mineralized rolling oil, which has poor biodegradability, large treatment difficulty and large environmental toxicity. The rolling line sludge in the steel industry has the characteristics of oil, water and iron content, complex components, high viscosity, sufficient emulsification, difficult sedimentation and poor dehydration effect.
The existing oily sludge treatment technology can be divided into: chemical treatment, thermal refining-mechanical separation, reinjection profile control, heat treatment, biological method and other newly derived treatment methods, but each method has respective advantages and disadvantages in the aspects of application range, technology, economy and the like; and the sludge treatment method in the current stage is relatively not targeted to the treatment of the sludge in the steel rolling line, and is not suitable for the treatment of some dangerous waste resources, so that the economic benefit is not high.
Disclosure of Invention
Aiming at the technical problems of low pertinence, relatively insufficient environmental protection in treatment and low economy of the existing steel industry rolling line sludge treatment method, the invention provides the treatment device and the treatment method of the steel industry rolling line sludge, the treated solid substances can be used as sintering raw materials to participate in proportioning, water is recycled by 100%, and oil can be sold or used as products, so that the recycling and harmless utilization of the rolling line sludge are realized.
In a first aspect, the invention provides a treatment device for sludge in a rolling line in the steel industry, which comprises a crusher, a stirrer, an ultrasonic processor and a three-phase centrifugal device which are sequentially connected, wherein the three-phase centrifugal device is provided with a water outlet, an oil outlet and a slag outlet, and the water outlet is communicated with a water inlet of the stirrer.
Further, still include the magnetic separation device, the discharge gate intercommunication of the feed inlet of magnetic separation device and mixer, the discharge gate of magnetic separation device and ultrasonic processor's feed inlet intercommunication, the taphole of magnetic separation device even has the iron content feed bin.
Furthermore, a slag outlet of the three-phase centrifuge is communicated with a feed bin containing iron.
Further, the device also comprises a fuel oil storage tank communicated with the oil outlet of the three-phase centrifuge.
In a second aspect, the invention provides a treatment method of sludge in a rolling line in the steel industry, which comprises the following steps:
(1) Crushing the rolling sludge in the steel industry, and then adding water to stir and temper;
(2) Carrying out ultrasonic treatment on the tempered sludge;
(3) And performing three-phase centrifugation on the product after ultrasonic treatment to obtain three products, namely water, oil and solid substances.
Further, the sludge of the rolling line in the steel industry refers to hot rolling sludge and cold rolling sludge generated in the rolling production process in the steel industry.
Furthermore, the iron powder in the sludge is subjected to magnetic separation and recovery before the quenched and tempered sludge is subjected to ultrasonic treatment, so that the service life of the ultrasonic processor is prolonged.
Further, after three-phase centrifugal treatment, the obtained solid substance is mixed with the recovered iron powder and then is used as a sintering ore batching raw material or is used for steelmaking after being pressed into blocks; the obtained oil is sold or used; one part of the obtained water is used during stirring and tempering, and the rest part of the obtained water directly returns to a water treatment system of a steel plant, so that no waste water is discharged in the whole process.
The invention has the beneficial effects that:
(1) The invention provides an ultrasonic wave and three-phase centrifugal technology for treating rolling line sludge, the treated solid substance can be used as a sintering raw material to participate in batching, water is recycled by 100%, and oil can be sold or used additionally as a product, so that the recycling and harmless utilization of the rolling line sludge are realized.
(2) Realizes the full treatment of the sludge of the rolling line in the steel industry. The process technology opens up a brand-new resource and high-value utilization way for the treatment of the rolling line sludge in the steel industry and realizes zero discharge of wastewater.
(3) Realizing no factory leaving of hazardous wastes. With the improvement of environmental protection consciousness, under the condition that solid waste is not delivered from a factory, hazardous waste is further prevented from being delivered from the factory, and the recycling of hazardous waste resources can be realized.
The device and the method for treating the rolling line sludge in the steel industry have obvious environmental protection benefit, economic benefit and social benefit for treating the rolling line sludge in the steel industry.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a process flow diagram of sludge treatment in a rolling line in the steel industry.
In the figure: the method comprises the following steps of 1-a crusher, 2-a stirrer, 3-a magnetic separation device, 4-an ultrasonic processor, 5-a three-phase centrifugal device, 6-a steel plant water treatment system, 7-a fuel oil storage tank and 8-an iron-containing storage bin.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The steel industry rolling line sludge treatment device adopted in the following embodiment comprises a crusher 1, a stirrer 2, a magnetic separation device 3, an ultrasonic processor 4 and a three-phase centrifugal device 5 which are connected in sequence, wherein the three-phase centrifugal device 5 is provided with a water outlet, an oil outlet and a slag outlet; the water outlet is respectively communicated with the water inlet of the stirrer 2 and the water treatment system 6 of the iron and steel plant, the slag outlet is communicated with the iron-containing bin 8, and the oil outlet is communicated with the fuel oil storage tank 7; the iron outlet of the magnetic separation device 3 is connected with an iron-containing bin 8.
Example 1
In a steel plant with the capacity of 1000 ten thousand tons, the annual output of hot-rolled sludge is about 12000 tons. The main components of the iron-based steel material comprise 3.95% of water content, 95.7% of solid content and 0.35% of oil content, wherein the iron content is as high as about 73.5%.
The method for treating the hot rolling sludge by adopting the sludge treatment device of the steel industrial rolling line comprises the following steps:
(1) Crushing the hot-rolled sludge in a crusher 1, adding water, and stirring, tempering and slurrying by a stirrer 2;
(2) The sludge after tempering enters a magnetic separation device 3 to remove iron powder and enters an iron-containing bin 8 through an iron outlet, the slurry after iron powder removal enters an ultrasonic processor 4, components with different densities, different particle sizes and different weights can be separated from one another through ultrasonic treatment, and then the components are aggregated according to the same physical properties;
(3) The product after ultrasonic treatment is conveyed into a three-phase centrifugal device 5 for efficient separation of all components, and three products of water, oil and solid substances are obtained after treatment by the three-phase centrifugal device 5; one part of the product water is used during stirring and tempering, and the rest part of the product water is directly returned to a water treatment system 6 of the steel plant, so that no wastewater is discharged in the whole process; the product oil can enter a fuel oil storage tank 7 and then be sold or used additionally; the solid substance of the product enters an iron-containing bunker 8 to be mixed with the recycled iron powder to be used as a sintering ore batching raw material or for steel making after briquetting.
In the embodiment 1, 42 cubic meters of fuel oil is finally obtained and sold to qualified companies; 11484 tons of solid materials are directly used as sintering ore raw materials for proportioning; one part of the obtained water is used during stirring and tempering, and the rest water is directly returned to a water treatment system of an iron and steel plant for large-system recycling, so that zero discharge of wastewater is completely realized.
Example 2
In a steel plant with capacity of 1000 ten thousand tons, the annual output of cold rolling sludge (containing rolling oil sludge, grinding sludge, acid-containing sludge and alkali-containing sludge) is about 5300 tons. The main components of the iron-containing iron-based composite material have the water content of more than or equal to 60 percent, the solid content of 20 percent and the oil content of about 20 percent, wherein the iron content is about 10 percent.
The method for treating the cold rolling sludge by adopting the steel industry rolling line sludge treatment device comprises the following steps:
(1) Crushing the cold-rolled sludge in a crusher 1, adding water, and stirring, tempering and slurrying by a stirrer 2;
(2) The sludge after tempering enters a magnetic separation device 3 to remove iron powder, the iron powder enters an iron-containing bin 8 through an iron outlet, the slurry after the iron powder removal enters an ultrasonic processor 4, the components with different densities, different particle sizes and different weights can be separated from one another through ultrasonic treatment, and then the components are aggregated according to the same physical properties;
(3) The product after ultrasonic treatment is conveyed into a three-phase centrifugal device 5 for efficient separation of all components, and three products of water, oil and solid substances are obtained after treatment by the three-phase centrifugal device 5; one part of the product water is used during stirring and tempering, and the rest part of the product water is directly returned to a water treatment system 6 of the steel plant, so that no wastewater is discharged in the whole process; the product oil can enter a fuel oil storage tank 7 and then be sold or used additionally; the solid substance of the product enters an iron-containing bunker 8 to be mixed with the recycled iron powder to be used as a sintering ore batching raw material or for steel making after briquetting.
In this example 2, 1060 cubic meters of fuel oil is finally obtained and sold to qualified companies; 1060 tons of solid materials are directly used as sintering ore raw materials for proportioning; one part of the obtained water is used during stirring and tempering, and the residual water is directly returned to a water treatment system of a steel plant for large-system recycling, so that zero discharge of wastewater is completely realized.
The device and the method for treating the sludge in the rolling line in the steel industry can be used for comprehensively utilizing the sludge resources in the rolling line in the steel industry and can also be used for comprehensively utilizing other oil sludge resources; the processing scale can reach 4 tons/hour, 100 tons/day, 2000 tons/year or larger.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. The utility model provides a processing apparatus of steel industry roll line mud, its characterized in that, is including the breaker, mixer, ultrasonic processor, the three-phase centrifugal device that connect gradually, and the three-phase centrifugal device is equipped with delivery port, oil-out and slag notch, and the delivery port communicates with the water inlet of mixer.
2. The apparatus of claim 1, further comprising a magnetic separation device, wherein the inlet of the magnetic separation device is connected to the outlet of the mixer, the outlet of the magnetic separation device is connected to the inlet of the ultrasonic processor, and the iron outlet of the magnetic separation device is connected to an iron-containing bin.
3. The apparatus for treating sludge in a rolling line in the steel industry according to claim 2, wherein the slag outlet of the three-phase centrifugal device is communicated with the iron-containing bin.
4. The apparatus for treating sludge in a rolling line in steel industry according to claim 1, further comprising a fuel oil storage tank in communication with the oil outlet.
5. The treatment method of the rolling line sludge in the steel industry is characterized by comprising the following steps:
(1) Crushing the sludge of the rolling line in the steel industry, and then adding water to stir and temper;
(2) Carrying out ultrasonic treatment on the tempered sludge;
(3) And performing three-phase centrifugation on the product after ultrasonic treatment to obtain three products, namely water, oil and solid substances.
6. The method for treating sludge in a steel industry rolling line according to claim 5, wherein the sludge in the steel industry rolling line refers to hot rolling sludge and/or cold rolling sludge generated in a steel industry rolling production process.
7. The method for treating rolling sludge in steel industry according to claim 5, wherein the iron powder in the sludge is magnetically separated and recovered before the quenched and tempered sludge is subjected to ultrasonic treatment.
8. The method of claim 7, wherein the solid material obtained after the three-phase centrifugal treatment is mixed with the recovered iron powder and used as a raw material for sintered ore or for steel making after briquetting; the obtained oil is sold or used; one part of the obtained water is used during stirring and tempering, and the rest part of the obtained water directly returns to a water treatment system of a steel plant, so that no waste water is discharged in the whole process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211385347.3A CN115745366A (en) | 2022-11-07 | 2022-11-07 | Device and method for treating sludge in rolling line in steel industry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211385347.3A CN115745366A (en) | 2022-11-07 | 2022-11-07 | Device and method for treating sludge in rolling line in steel industry |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105923949A (en) * | 2016-06-15 | 2016-09-07 | 南阳华美石油设备有限公司 | Self-propelled oily sludge treatment facility and process thereof |
| CN210764959U (en) * | 2019-09-24 | 2020-06-16 | 杭州良环科技有限公司 | Liquid sewage sludge treatment device |
| CN210764913U (en) * | 2019-09-24 | 2020-06-16 | 杭州良环科技有限公司 | Many gradients coupling oil sludge processing apparatus |
| CN211056924U (en) * | 2019-09-26 | 2020-07-21 | 李锋 | Innocent treatment system of oily sludge |
| WO2022061958A1 (en) * | 2020-09-27 | 2022-03-31 | 航天凯天环保科技股份有限公司 | Harmless and resourceful integrated treatment method and system for oil sludge |
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- 2022-11-07 CN CN202211385347.3A patent/CN115745366A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105923949A (en) * | 2016-06-15 | 2016-09-07 | 南阳华美石油设备有限公司 | Self-propelled oily sludge treatment facility and process thereof |
| CN210764959U (en) * | 2019-09-24 | 2020-06-16 | 杭州良环科技有限公司 | Liquid sewage sludge treatment device |
| CN210764913U (en) * | 2019-09-24 | 2020-06-16 | 杭州良环科技有限公司 | Many gradients coupling oil sludge processing apparatus |
| CN211056924U (en) * | 2019-09-26 | 2020-07-21 | 李锋 | Innocent treatment system of oily sludge |
| WO2022061958A1 (en) * | 2020-09-27 | 2022-03-31 | 航天凯天环保科技股份有限公司 | Harmless and resourceful integrated treatment method and system for oil sludge |
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