Treatment method and treatment system for hot rolling turbid circulating water based on high-speed sand filter

Abstract

The invention discloses a hot rolling turbid circulating water treatment method and system based on a high-speed sand filter, and the treatment method comprises the steps: adding a coagulant into hot rolling turbid circulating water, and carrying out rotational flow precipitation treatment to obtain hot rolling turbid circulating water after rotational flow precipitation; a flocculating agent is added into the hot rolling turbid circulating water obtained after rotational flow precipitation, advection precipitation treatment and intermittent slag scraping treatment are conducted, the hot rolling turbid circulating water obtained after advection precipitation is obtained, and the adding amount of the flocculating agent is 620-650 g / h; and filtering the hot-rolling turbid circulating water subjected to advection precipitation through a high-speed sand filter to obtain treated hot-rolling turbid circulating water, wherein the turbidity of the treated hot-rolling turbid circulating water is less than or equal to 50mg / L. The treatment method can increase the precipitation amount of the oxide scale, reduce the operation load of the filter and reduce the turbidity of turbid circulating water supply.

Description

Technical Field

[0001] The present application belongs to the technical field of hot rolling turbid water treatment, and in particular relates to a hot rolling turbid water treatment method and treatment system based on a high-speed sand filter. Background Art

[0002] The hot rolling turbid ring circulating water contains a large amount of iron oxide scale slag. The current treatment methods are filtration and magnetic separation. Among them, the magnetic separation method generally uses equipment such as electromagnetic separators, which have high equipment costs, complex maintenance, and high requirements for magnetic field strength and stability; the filtration method generally includes: the hot rolling turbid ring water is passed through a cyclone tank to precipitate large particles of iron oxide scale, and then it is lifted to a horizontal flow tank. The wastewater is mainly composed of iron oxide scale microparticles. After physical precipitation in the horizontal flow tank, the precipitate is scraped to the slag pit at the water inlet end of the horizontal flow tank by the scraper at the bottom of the scraper. Finally, the crane grabber clears the waste slag out of the circulating water system.

[0003] During the operation of the scraper and oil scraper in the horizontal flow sedimentation tank, due to the scraping against the water flow, some iron oxide particles float up again due to the disturbance of the water flow, causing the water out of the horizontal flow tank to turn black, the suspended matter content in the water quality to increase, and the operating load of the subsequent filter to increase. Summary of the Invention

[0004] The embodiment of the present application provides a method and system for treating hot-rolled turbid ring water based on a high-speed sand filter. The treatment method can increase the amount of iron oxide precipitation, reduce the operating load of the filter, and reduce the turbidity of the turbid ring water supply.

[0005] A method for treating hot-rolled turbid water based on a high-speed sand filter comprises: adding a coagulant to the hot-rolled turbid water and performing a cyclone sedimentation treatment to obtain hot-rolled turbid water after cyclone sedimentation; adding a flocculant to the hot-rolled turbid water after cyclone sedimentation and performing a horizontal sedimentation treatment and an intermittent scraping treatment to obtain hot-rolled turbid water after horizontal sedimentation, wherein the amount of flocculant added is 620 g / h to 650 g / h, and the turbidity of the hot-rolled turbid water after horizontal sedimentation is 40 mg / L to 50 mg / L; and filtering the hot-rolled turbid water after horizontal sedimentation through a high-speed sand filter to obtain treated hot-rolled turbid water.

[0006] The treatment method of the present application reduces the influence of iron oxide scale on the compaction of filter media by adding a coagulant in the vortex sedimentation treatment and adding a flocculant in the horizontal sedimentation at an amount of 620g / h to 650g / h combined with intermittent scraping treatment, which can make the microparticles sink in large quantities during the horizontal sedimentation treatment process, thereby making the turbidity of the hot-rolled turbid water after horizontal sedimentation 40mg / L to 50mg / L, further reducing the problem of compaction of filter media in the filter, and improving the production quality in the subsequent steel production process.

[0007] In some specific embodiments, the mass ratio of flocculant to coagulant is 1:40 to 1:50.

[0008] In the above-mentioned specific embodiment, when the mass ratio of flocculant to coagulant is 1:40 to 1:50, the two work synergistically. The coagulant first destabilizes tiny suspended particles in the water through actions such as electrical neutralization, while the flocculant, leveraging its long-chain structure, further adsorbs and bridges the destabilized particles, forming larger flocs. A mass ratio of flocculant to coagulant of 0.5:1 to 2.2:1 allows these two processes to be seamlessly integrated and efficiently executed, significantly enhancing the sedimentation effect, more quickly and thoroughly removing impurities from the water, and improving treatment efficiency. This also promotes a tighter and more robust floc structure, better encapsulating impurities during sedimentation and further reducing sludge volume.

[0009] In some specific embodiments, in the step of adding a coagulant to the hot-rolled turbid water and performing a cyclone sedimentation treatment to obtain the hot-rolled turbid water after cyclone sedimentation, the amount of coagulant added is 25 kg / h to 30 kg / h.

[0010] In some specific embodiments, a coagulant is added to the hot rolling turbid water and a cyclone sedimentation treatment is performed to obtain the hot rolling turbid water after cyclone sedimentation. The water inlet flow rate of the cyclone sedimentation treatment is 12000m3 / h~13000m3 / h, and the hydraulic retention time is 0.4h~0.5h.

[0011] In the above specific embodiment, when the water inlet flow rate of the cyclone sedimentation treatment is 12000m3 / h~13000m3 / h and the hydraulic retention time is 0.4h~0.5h, the water flow can produce a strong cyclone effect, which can effectively use the centrifugal force to quickly throw the suspended particles with higher density in the water to the pool wall and precipitate. At the same time, the hydraulic retention time ensures that the particles have sufficient time to settle and separate, further improving the efficiency of cyclone sedimentation in removing impurities and reducing the burden on subsequent treatment processes.

[0012] In some specific embodiments, flocculants are added to the hot-rolled turbid water after cyclone sedimentation and subjected to horizontal sedimentation treatment and intermittent scraping treatment to obtain the hot-rolled turbid water after horizontal sedimentation, and the horizontal sedimentation treatment time is 0.4h to 0.5h.

[0013] In the above specific embodiment, when the horizontal flow sedimentation treatment time is 0.4h to 0.5h, the flocs can be more thoroughly settled to the bottom of the pool, further reducing the content of suspended impurities in the water and alleviating the treatment load for the subsequent high-speed sand filter.

[0014] In some specific embodiments, a flocculant is added to the hot-rolled turbid water after cyclone sedimentation and horizontal sedimentation treatment and intermittent scraping treatment are performed to obtain the hot-rolled turbid water after horizontal sedimentation. The intermittent scraping treatment includes: using a scraper to scrape 2 to 3 times a day, each scraping time is 30 minutes, and the time interval between two adjacent scrapings is ≥5 hours.

[0015] In the above specific implementation, the intermittent scraping treatment can timely clean the impurities accumulated in the horizontal flow sedimentation tank, provide sufficient sedimentation area for the newly generated flocs, and at the same time reduce the floating of iron oxide scale slag caused by water disturbance to affect water quality.

[0016] In some specific embodiments, in the step of filtering the hot-rolled turbid ring water after horizontal sedimentation through a high-speed sand filter to obtain treated hot-rolled turbid ring water, the filtration speed of the high-speed sand filter is 25 m / h.

[0017] In the above specific implementation manner, when the filtration speed is 25 m / h, the energy consumption of the equipment operation can be reduced while meeting the processing capacity and water quality requirements.

[0018] In some embodiments, the coagulant comprises polymeric alumina and / or polymeric ferric sulfate.

[0019] In some embodiments, the flocculant comprises polyacrylamide and / or sodium polystyrene sulfonate.

[0020] In a second aspect, a treatment system for hot rolling turbid circulating water based on the treatment method of the first aspect is provided. The treatment system comprises a turbidity sedimentation tank, a horizontal flow sedimentation tank and a high-speed sand filter connected in sequence, and a scraper is provided in the horizontal flow sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic process flow chart of a processing system according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0024] For simplicity, this application only explicitly discloses certain numerical ranges. However, any lower limit may be combined with any upper limit to form an unspecified range; and any lower limit may be combined with other lower limits to form an unspecified range, and similarly, any upper limit may be combined with any other upper limit to form an unspecified range. In addition, although not explicitly stated, each point or individual value between the endpoints of a range is included in the range. Thus, each point or individual value may serve as its own lower limit or upper limit and be combined with any other point or individual value, or with other lower limits or upper limits, to form an unspecified range.

[0025] The above invention content of this application is not intended to describe every disclosed embodiment or every implementation in this application. The following description illustrates exemplary embodiments in more detail. In many places throughout the application, guidance is provided through a series of examples, which can be used in various combinations. In each example, the enumeration is only as a representative group and should not be interpreted as exhaustive. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] The hot rolling turbid ring circulating water contains a large amount of iron oxide scale slag. The current treatment methods are filtration and magnetic separation. Among them, the magnetic separation method generally uses equipment such as electromagnetic separators, which have high equipment costs, complex maintenance, and high requirements for magnetic field strength and stability; the filtration method generally includes: the hot rolling turbid ring water is passed through a cyclone tank to precipitate large particles of iron oxide scale, and then it is lifted to a horizontal flow tank. The wastewater is mainly composed of iron oxide scale microparticles. After physical precipitation in the horizontal flow tank, the precipitate is scraped to the slag pit at the water inlet end of the horizontal flow tank by the scraper at the bottom of the scraper. Finally, the crane grabber clears the waste slag out of the circulating water system.

[0027] During the operation of the scraper and oil scraper in the horizontal flow sedimentation tank, due to the scraping against the water flow, some iron oxide particles float up again due to the disturbance of the water flow, causing the water out of the horizontal flow tank to turn black, the suspended matter content in the water quality to increase, and the operating load of the subsequent filter to increase.

[0028] Based on the above problems, an embodiment of the present application provides a treatment method and system for hot-rolled turbid ring water based on a high-speed sand filter. The treatment method can increase the amount of iron oxide precipitation, reduce the operating load of the filter, and reduce the turbidity of the turbid ring water supply.

[0029] The following first introduces the treatment method of hot-rolled turbid ring water based on high-speed sand filter of the present application.

[0030] Treatment method of hot rolling turbid water based on high-speed sand filter

[0031] A method for treating hot-rolled turbid water based on a high-speed sand filter comprises: adding a coagulant to the hot-rolled turbid water and performing a cyclone sedimentation treatment to obtain hot-rolled turbid water after cyclone sedimentation; adding a flocculant to the hot-rolled turbid water after cyclone sedimentation and performing a horizontal sedimentation treatment and an intermittent scraping treatment to obtain hot-rolled turbid water after horizontal sedimentation, wherein the amount of flocculant added is 620 g / h to 650 g / h, and the turbidity of the hot-rolled turbid water after horizontal sedimentation is 40 mg / L to 50 mg / L; and filtering the hot-rolled turbid water after horizontal sedimentation through a high-speed sand filter to obtain treated hot-rolled turbid water.

[0032] As an example, the amount of flocculant added can be 620 g / h, 625 g / h, 630 g / h, 635 g / h, 640 g / h, 645 g / h, 650 g / h or a range consisting of any two of these values.

[0033] The treatment method of the present application reduces the influence of iron oxide scale on the compaction of filter media by adding a coagulant in the cyclone sedimentation treatment and adding a flocculant in the horizontal sedimentation at an amount of 620g / h to 650g / h in combination with intermittent scraping treatment. It can not only make the microparticles sink in large quantities during the horizontal sedimentation treatment, but also reduce the problem of compaction of filter media in the filter, so that the turbidity of the treated turbid circulating water is 40mg / L to 50mg / L, further improving the production quality in the subsequent steel production process.

[0034] In some embodiments, the mass ratio of the flocculant to the coagulant is 1:40 to 1:50.

[0035] As an example, the mass ratio of the flocculant to the coagulant can be 1:40, 1:41, 1:42, 1:43, 1:44, 1:45, 1:46, 1:47, 1:48, 1:49, 1:50 or a range consisting of any two values ​​therein.

[0036] In the above-mentioned embodiment, when the mass ratio of flocculant to coagulant is 1:40 to 1:50, the two work synergistically. The coagulant first destabilizes tiny suspended particles in the water through actions such as electrical neutralization, while the flocculant, leveraging its long-chain structure, further adsorbs and bridges the destabilized particles, forming larger flocs. A mass ratio of flocculant to coagulant of 1:40 to 1:50 allows these two processes to be seamlessly integrated and efficiently executed, significantly enhancing the sedimentation effect, more quickly and thoroughly removing impurities from the water, and improving treatment efficiency. It also promotes a denser and stronger floc structure, better encapsulating impurities during sedimentation and further reducing sludge volume.

[0037] In some embodiments, in the step of adding a coagulant to the hot-rolled turbid water and performing a cyclone sedimentation treatment to obtain the hot-rolled turbid water after cyclone sedimentation, the amount of coagulant added is 25 kg / h to 30 kg / h.

[0038] In some embodiments, a coagulant is added to the hot-rolled turbid water and a cyclone sedimentation treatment is performed to obtain the hot-rolled turbid water after cyclone sedimentation. The water inlet flow rate of the cyclone sedimentation treatment is 12,000 m3 / h to 13,000 m3 / h, and the hydraulic retention time is 0.4h to 0.5h.

[0039] For example, the water inlet flow rate of the cyclone sedimentation process can be 12000 m3 / h, 12200 m3 / h, 12500 m3 / h, 12800 m3 / h, 13000 m3 / h, or a range consisting of any two of these values. The hydraulic retention time of the cyclone sedimentation process can be 0.4h, 0.42h, 0.44h, 0.46h, 0.48h, 0.5h, or a range consisting of any two of these values.

[0040] In the above embodiment, when the water inlet flow rate of the cyclone sedimentation treatment is 12000m3 / h~13000m3 / h and the hydraulic retention time is 0.4h~0.5h, the water flow can produce a strong cyclone effect, which can effectively use the centrifugal force to quickly throw the suspended particles with higher density in the water to the pool wall and settle. At the same time, the hydraulic retention time ensures that the particles have sufficient time to settle and separate, further improving the efficiency of the cyclone sedimentation in removing impurities and reducing the burden on subsequent treatment processes.

[0041] In some embodiments, flocculants are added to the hot-rolled turbid water after cyclone sedimentation and subjected to horizontal sedimentation treatment and intermittent scraping treatment to obtain the hot-rolled turbid water after horizontal sedimentation. The horizontal sedimentation treatment time is 0.4h to 0.5h.

[0042] As an example, the time for the advection sedimentation treatment can be 0.4 h, 0.42 h, 0.44 h, 0.46 h, 0.48 h, 0.5 h, or a range consisting of any two values ​​therein.

[0043] In the above embodiment, when the horizontal flow sedimentation treatment time is 0.4h to 0.5h, the flocs can be more thoroughly settled to the bottom of the pool, further reducing the content of suspended impurities in the water and alleviating the treatment load for the subsequent high-speed sand filter.

[0044] In some embodiments, a flocculant is added to the hot-rolled turbid water after cyclone sedimentation and horizontal sedimentation treatment and intermittent scraping treatment are performed to obtain the hot-rolled turbid water after horizontal sedimentation. In the step of intermittent scraping treatment, the intermittent scraping treatment includes: using a scraping machine to scrape the slag 2 to 3 times a day, each scraping time is 30 minutes, and the time interval between two adjacent scrapings is ≥5 hours.

[0045] In the above embodiment, the intermittent scraping process can promptly clean the impurities accumulated in the horizontal flow sedimentation tank, provide sufficient sedimentation area for the newly generated flocs, and at the same time reduce the floating of iron oxide scale slag caused by water disturbance to affect water quality.

[0046] In some embodiments, in the step of filtering the hot-rolled turbid water after horizontal sedimentation through a high-speed sand filter to obtain treated hot-rolled turbid water, the filtration speed of the high-speed sand filter is 25 m / h.

[0047] In the above embodiment, when the filtration speed is 25 m / h, the energy consumption of the equipment operation can be reduced while meeting the processing capacity and water quality requirements.

[0048] In some embodiments, the coagulant comprises polymeric alumina (PAC) and / or polyferric sulfate (PFS).

[0049] In some embodiments, the flocculant comprises polyacrylamide (PAM) and / or sodium polystyrene sulfonate (FSS).

[0050] A treatment system for hot rolling turbid circulating water based on the above treatment method comprises a turbidity flow sedimentation tank, a horizontal flow sedimentation tank and a high-speed sand filter connected in sequence, wherein a scraper is provided in the horizontal flow sedimentation tank.

[0051] In some embodiments, as Figure 1As shown, the treatment system includes an iron oxide ditch arranged below the rolling mill to collect the turbid circulating water after rolling, the iron oxide ditch is provided with a flow channel, the flow channel is connected to the inlet of the cyclone sedimentation tank, the cyclone sedimentation tank is provided with a coagulant dosing device, the turbid circulating water after rolling is preliminarily precipitated in the cyclone sedimentation tank, at least one water outlet of the cyclone sedimentation tank is connected to the horizontal flow sedimentation tank, the horizontal flow sedimentation tank is provided with a flocculant dosing device and a scraper, the turbid circulating water after cyclone sedimentation is flocculated and precipitated in the horizontal flow sedimentation tank, the scraper scrapes off the slag and oil, at least one liquid outlet of the horizontal flow sedimentation tank is connected to the high-speed sand filter, the turbid circulating water after horizontal flow sedimentation treatment is deeply filtered in the high-speed sand filter, the liquid outlet of the high-speed sand filter is connected to the cooling tower and the cold water tank in sequence through a pipeline, and the turbid circulating water is circulated to the rolling mill for use after adding medicine and replenishing cold water in the cold water tank.

[0052] As an example, the coagulant dosing device can be connected to the end of the slag flushing ditch of the cyclone sedimentation tank, and the flocculant dosing device can be connected to the water inlet end of the horizontal flow sedimentation tank.

[0053] The following examples describe the present disclosure in more detail and are intended to be illustrative only, as various modifications and variations within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are by weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods and used directly without further processing, and all instruments used in the examples are commercially available.

[0054] Example 1

[0055] A method for treating hot-rolling turbid water based on a high-speed sand filter comprises: adding PAC to the hot-rolling turbid water and performing cyclone sedimentation treatment to obtain hot-rolling turbid water after cyclone sedimentation, wherein the amount of PAC added is 29 kg / h, the water inlet flow rate of the cyclone sedimentation treatment is 12,000 m3 / h, and the hydraulic retention time is 0.4 h.

[0056] PAM was added to the hot-rolled turbid water after cyclonic sedimentation, and advection sedimentation and intermittent scraping were performed to obtain advection-sedimented hot-rolled turbid water. The PAM addition rate was 625 g / h, the advection sedimentation treatment lasted 0.4 h, and the scraper was used for scraping twice daily, each time for 30 minutes, with an interval of ≥5 hours between each scraping. The turbidity of the advection-sedimented hot-rolled turbid water was 40 mg / L, and the average slag discharge from the advection tank was 50-60 tons / day.

[0057] The hot-rolled turbid water after horizontal sedimentation is filtered through a high-speed sand filter at a filtration speed of 25 m / h to obtain the treated hot-rolled turbid water. The middle layer of the filter material of the high-speed sand filter has less caking and is loose, and the high-speed sand filter operates normally.

[0058] Example 2

[0059] The only difference between Example 2 and Example 1 is that the amount of PAC added is 30 kg / h, the amount of PAM added is 650 g / h, the average slag discharge of the advection tank is 50-60 tons / day, the middle layer of the filter material of the high-speed sand filter is less agglomerated and loose, and the high-speed sand filter operates normally.

[0060] Example 3

[0061] The only difference between Example 3 and Example 1 is that a scraper is used to scrape the slag three times a day, each scraping lasting 30 minutes, with the interval between two scrapings being ≥5 hours. The average slag discharge from the advection tank is 50-60 tons / day. The middle layer of the filter media in the high-speed sand filter is less clumping and more loose, and the high-speed sand filter operates normally.

[0062] Comparative Example 1

[0063] The only difference between Comparative Example 1 and Example 1 is that no PAC is added in the cyclone sedimentation treatment, and no PAM is added in the advection sedimentation treatment. The turbidity of the hot rolling turbid water after advection sedimentation is 130 mg / L, the average slag discharge of the advection tank is 20-30 tons / day, and the middle layer of the filter material of the high-speed sand filter is heavily agglomerated.

[0064] Comparative Example 2

[0065] The only difference between Comparative Example 2 and Example 1 is that the amount of PAC added is 62.5 g / h, the amount of PAM added is 833 g / h, the average slag discharge of the advection tank is 50-60 tons / day, and the middle layer of the filter material of the high-speed sand filter is more agglomerated and loose, which has a greater impact on the operation of the high-speed sand filter.

[0066] Comparative Example 3

[0067] The only difference between Comparative Example 3 and Example 1 is that the addition amount of PAC is 125 kg / h and the addition amount of PAM is 1250 g / h. The middle layer of the filter material of the high-speed sand filter is heavily agglomerated and dense, which seriously affects the operation of the high-speed sand filter.

[0068] Comparative Example 4

[0069] The only difference between Comparative Example 4 and Example 1 is that intermittent scraping treatment is not used. The scraper is operated continuously for 8 hours, and the turbidity of the hot rolling turbid water after horizontal sedimentation is 90 mg / L.

[0070] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for treating hot-rolled turbid water based on a high-speed sand filter, characterized in that: include: Adding a coagulant to the hot rolling turbid water and performing a cyclone sedimentation treatment to obtain hot rolling turbid water after cyclone sedimentation; Adding a flocculant to the hot-rolled turbid water after cyclone sedimentation and performing advection sedimentation treatment and intermittent scraping treatment to obtain hot-rolled turbid water after advection sedimentation, wherein the amount of the flocculant added is 620 g / h to 650 g / h, and the turbidity of the hot-rolled turbid water after advection sedimentation is 40 mg / L to 50 mg / L; The hot-rolled turbid water after horizontal sedimentation is filtered through a high-speed sand filter to obtain treated hot-rolled turbid water.

2. The processing method according to claim 1, characterized in that The mass ratio of the flocculant to the coagulant is 1:40 to 1:

50.

3. The processing method according to claim 1, characterized in that In the step of adding a coagulant to the hot-rolled turbid water and performing a cyclone sedimentation treatment to obtain the hot-rolled turbid water after cyclone sedimentation, the amount of the coagulant added is 25kg / h to 30kg / h.

4. The processing method according to claim 1, characterized in that In the step of adding a coagulant to the hot rolling turbid water and performing a cyclone sedimentation treatment to obtain the hot rolling turbid water after cyclone sedimentation, the water inlet flow rate of the cyclone sedimentation treatment is 12000m 3 / h~13000m 3 / h, hydraulic retention time is 0.4h~0.5h.

5. The processing method according to claim 1, characterized in that In the step of adding a flocculant to the hot-rolled turbid water after cyclone sedimentation and performing horizontal sedimentation treatment and intermittent scraping treatment to obtain the hot-rolled turbid water after horizontal sedimentation, the horizontal sedimentation treatment time is 0.4h to 0.5h.

6. The processing method according to claim 1, characterized in that In the step of adding a flocculant to the hot-rolled turbid water after cyclone sedimentation and performing horizontal sedimentation treatment and intermittent scraping treatment to obtain the hot-rolled turbid water after horizontal sedimentation, the intermittent scraping treatment includes: using a scraping machine to scrape the slag 2 to 3 times a day, each scraping time is 30 minutes, and the time interval between two adjacent scraping times is ≥5 hours.

7. The processing method according to claim 1, characterized in that In the step of filtering the hot-rolled turbid ring water after horizontal sedimentation through a high-speed sand filter to obtain treated hot-rolled turbid ring water, the filtration speed of the high-speed sand filter is 25m / h.

8. The processing method according to claim 1, characterized in that The coagulant includes polymeric aluminum oxide and / or polymeric ferric sulfate.

9. The processing method according to claim 1, characterized in that: The flocculant includes polyacrylamide and / or sodium polystyrene sulfonate.

10. A system for treating hot rolling turbid water based on the treatment method according to any one of claims 1 to 9, characterized in that: The invention comprises a turbidity flow sedimentation tank, a horizontal flow sedimentation tank and a high-speed sand filter which are connected in sequence. A scraper is arranged in the horizontal flow sedimentation tank.

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