CN111500803B - Device and method for recycling strong brine to steel slag hot disintegrating treatment - Google Patents

Device and method for recycling strong brine to steel slag hot disintegrating treatment Download PDF

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Publication number
CN111500803B
CN111500803B CN202010472912.4A CN202010472912A CN111500803B CN 111500803 B CN111500803 B CN 111500803B CN 202010472912 A CN202010472912 A CN 202010472912A CN 111500803 B CN111500803 B CN 111500803B
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hot
steel slag
closed
disintegrating
sedimentation tank
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CN111500803A (en
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高康乐
李惊涛
王海东
夏春
张亮亮
李红
逯博特
蔡怡清
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Central Research Institute of Building and Construction Co Ltd MCC Group
MCC Energy Saving and Environmental Protection Co Ltd
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Central Research Institute of Building and Construction Co Ltd MCC Group
MCC Energy Saving and Environmental Protection Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/07—Receptacle features where the slag is treated open to atmosphere
    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

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  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention relates to a device and a method for recycling strong brine to steel slag hot disintegrating treatment, belonging to the technical field of environmental protection. The strong brine of the iron and steel enterprises is directly conveyed to a steel slag hot-closed backwater well through a centrifugal pump, is lifted to enter a hot-closed sedimentation tank to be rapidly precipitated through a slag slurry pump after reacting with hot-closed backwater alkali liquor, and the supernatant automatically flows into a steel slag hot-closed water absorbing well, and enters a secondary steel slag treatment production line after sludge in the sedimentation tank is concentrated and dehydrated. Adding a scale inhibiting dispersing agent into a hot-closed water absorbing well to prevent a hot-closed water system from scaling, and collecting dust and steam generated in the steel slag hot-closed process through a gas collecting hood for treatment. The invention can realize the treatment of the strong brine with the lowest cost for iron and steel enterprises and realize the digestion of the strong brine.

Description

Device and method for recycling strong brine to steel slag hot disintegrating treatment
Technical Field
The invention relates to a wastewater treatment and recycling method, in particular to a device and a method for recycling strong brine to steel slag hot disintegrating treatment.
Background
The steel industry is a large household of water and is one of the most serious industries with environmental pollution. With the development of the steel industry, the scale of steel enterprises increases from 5220 ten thousand tons in steel yield in 1986 to nearly 9 hundred million tons in 2018. The large increase in steel production also exacerbates the increase in water usage, making the water resources that are inherently in shortage more intense. In order to reduce the new water amount for taking ton steel and improve the water reuse rate, each large steel enterprise establishes an independent wastewater treatment system in each procedure, and then establishes a comprehensive wastewater treatment plant to recycle all factory wastewater. The salt content of the effluent after the comprehensive sewage treatment is higher, the effluent is used as the make-up water of the circulating cooling water in each process for recycling, enterprises have to select ultrafiltration reverse osmosis to carry out desalination treatment on the comprehensive sewage, and the desalination process inevitably generates 20-30% of high-salt wastewater. The main water quality characteristics of the high-salt wastewater of the iron and steel enterprises are as follows: high salt content, high hardness and partial organic pollutant content.
Currently, high-salt water is used in cascade or directly discharged, and as the discharge standard and supervision are originally stricter, more and more enterprises consider that the strong salt water is treated or consumed in factories. The common strong brine treatment method at present mainly comprises the steps of softening through pretreatment, further concentrating through a membrane, and finally evaporating and crystallizing.
The method for treating the high-salt wastewater (CN 104692574A) disclosed in 6 th and 10 th 2015 mainly adopts a high-density sedimentation tank, a multi-stage ion exchange resin system, and membrane methods such as Ultrafiltration (UF), nanofiltration (NF), reverse Osmosis (RO), a high-pressure flat membrane and the like to couple, and finally MVR (mechanical vapor recompression) evaporative crystallization or freezing crystallization is carried out. The treatment process is complex to operate and has high investment cost and operation cost.
"a steel industry strong brine treatment apparatus and method" (CN 108975565 a) disclosed in 12/11/2018 discloses a steel industry strong brine treatment apparatus and method, the treatment apparatus sequentially comprising: the system comprises a strong brine Reverse Osmosis (RO) system, a Nanofiltration (NF) system, a reverse osmosis seawater desalination (SWRO) system, a Nanofiltration (NF) strong water tank and a new water tank, wherein the strong brine reverse osmosis system is connected with the nanofiltration system, the nanofiltration system is respectively connected with the Nanofiltration (NF) strong water tank and the reverse osmosis seawater desalination system, and the reverse osmosis seawater desalination system is connected with the new water tank. This treatment process allows energy recovery, but is silent about how Nanofiltration (NF) concentrate and SWRO concentrate are treated.
The "zero discharge process and equipment for high salt wastewater treatment" (CN 107381885A) disclosed in 11 and 24 of 2017 discloses a zero discharge process for high salt wastewater treatment. The process mainly comprises the steps of removing suspended matters, chemically removing hardness, performing tubular membrane solid-liquid separation, performing ion exchange resin, desalting strong brine by a micro-electrolysis bipolar membrane device and desalting by a reverse osmosis device, and finally obtaining desalted water, acid and sodium hydroxide commodities.
In fact, the high salt content wastewater exists in the steel enterprises for possible users to be absorbed, namely, the hot disintegrating treatment process of the converter steel slag. In the converter steel slag treatment process, f-CaO (free calcium oxide) and f-MgO (free magnesium oxide) in the steel slag are digested to generate alkali liquor containing calcium and magnesium, and the high-concentration carbonate hardness in the strong brine is removed by reaction in the alkali liquor. However, the problem that the strong brine is reused in the steel slag hot-disintegrating process and has influence on the quality of steel slag products, scaling of a steel slag hot-disintegrating water pipeline and secondary pollution caused by pollutant transfer becomes a main limiting factor.
Disclosure of Invention
Aiming at the problems of complex treatment flow, high construction cost and operation cost of the existing strong brine of iron and steel enterprises and frequent cleaning of a membrane system. The invention provides a process method for recycling strong brine to steel slag hot-disintegrating treatment, and the quality in the process is controlled, so that the problem of terminal digestion of the strong brine can be effectively solved, and the steel slag hot-disintegrating process is not adversely affected.
In order to solve the technical problems, the invention provides a device for recycling strong brine to steel slag thermal distress, which comprises: the device comprises a hot-closed backwater well (2), a hot-closed sedimentation tank (3), a sludge treatment system (4), a flocculating agent adding system (5), a steel slag hot-closed water absorbing well (6), a scale inhibitor dispersing adding system (7), a steel slag hot-closed treatment system (8) and a dust and gas collecting system (9); the inlet end of the hot closed backwater well (2) is connected with a concentrated brine pipeline for receiving the concentrated brine of the iron and steel enterprises; the outlet end of the hot-closed backwater well (2) is connected with the inlet end of the hot-closed sedimentation tank (3) and is used for conveying water in the hot-closed backwater well (2) into the hot-closed sedimentation tank (3) for treatment, and the flocculant adding system (5) is in operable connection with the hot-closed sedimentation tank (3) and is used for adding flocculant into the hot-closed sedimentation tank (3); the outlet end of the hot-closed sedimentation tank (3) is connected with the inlet end of the steel slag hot-closed water absorbing well (6) and is used for conveying the water treated by the hot-closed sedimentation tank (3) into the steel slag hot-closed water absorbing well (6) for treatment; the hot closed sedimentation tank (3) is connected with the sludge treatment system (4) and is used for conveying the sludge in the hot closed sedimentation tank (3) into the sludge treatment system (4); the scale inhibition and dispersion agent adding system (7) is in operable connection with the steel slag hot-closed water absorbing well (6) and is used for adding the scale inhibition and dispersion agent into the steel slag hot-closed water absorbing well (6); the outlet end of the steel slag hot-closed water absorbing well (6) is connected with a steel slag hot-closed treatment system (8) and is used for conveying circulating water in the steel slag hot-closed water absorbing well (6) to the steel slag hot-closed treatment system (8); the steel slag hot-disintegrating treatment system (8) is connected with the water return end of the hot-disintegrating water return well (2) and is used for enabling the hot-disintegrating water return well (2) to receive hot-disintegrating water return generated by the steel slag hot-disintegrating treatment system (8); the steel slag hot-disintegrating treatment system (8) is connected with a dust and gas collection system (9) and is used for collecting dust and steam generated in the steel slag hot-disintegrating treatment system (8).
Wherein, the steel slag hot disintegrating treatment system (8) is connected with a steel slag secondary treatment system and is used for feeding stabilized steel slag (10) obtained by the steel slag hot disintegrating treatment system (8) into the steel slag secondary treatment system for magnetic separation and screening.
The outlet end of the hot-closed backwater well (2) is connected with the inlet end of the hot-closed sedimentation tank (3) through a slurry pump, and the hot-closed backwater well (2) is used for lifting water in the hot-closed backwater well (2) into the hot-closed sedimentation tank through the slurry pump to quickly sediment. Wherein, the concentrated brine pipeline is provided with an automatic control valve and a metering device. Wherein the hot closed sedimentation tank (3) is a horizontal sedimentation tank, an amplitude sedimentation tank or an inclined plate sedimentation tank. Wherein, supernatant effluent of the hot-closed sedimentation tank (3) automatically flows into the hot-closed water absorbing well (6) through a pipeline. Wherein, the steel slag hot-disintegrating treatment system (8) comprises a pool type hot-disintegrating treatment system and a tank type pressurized hot-disintegrating treatment system.
In order to solve the technical problems, the invention also provides a method for recycling strong brine to the steel slag hot disintegrating treatment, preferably a method for treating by adopting the device, which comprises the following steps:
step (1): the strong brine of the iron and steel enterprises is directly conveyed to a steel slag hot closed backwater well (2);
step (2): the method comprises the steps that hot-closed backwater alkali liquor received from a steel slag hot-closed treatment system (8) in a steel slag hot-closed backwater well (2) is mixed with concentrated brine of a steel enterprise to generate calcium carbonate through chemical reaction, the calcium carbonate is sent to a hot-closed sedimentation tank (3), preferably, the calcium carbonate is sent to the hot-closed sedimentation tank (3) through a slag slurry pump, flocculating agent is added into the hot-closed sedimentation tank (3) through a flocculating agent adding system (5) to remove suspended matters, and then water in the hot-closed sedimentation tank (3) automatically flows into a steel slag hot-closed water absorbing well (6) for further recycling;
step (3): the sludge generated by the hot stuffy sedimentation tank (3) in the step (2) is dehydrated by a sludge treatment system (4) and then is sent into a secondary steel slag treatment production line; adding a scale inhibition dispersing agent into the steel slag hot-closed water absorbing well (6) through a scale inhibition dispersing and adding system (7), so as to ensure that the steel slag hot-closed treatment system (8) is not scaled; preferably ensuring that a hot disintegrating water system of the steel slag hot disintegrating treatment system (8) does not scale;
step (4): the circulating water obtained by adding the scale inhibition and dispersion agent into the steel slag hot-closed water absorbing well (6) and then carrying out treatment is sent to a steel slag hot-closed treatment system (8), dust and steam generated by the steel slag hot-closed treatment system (8) are collected and treated by a dust and gas collecting system (9), and hot-closed backwater alkali liquid generated by the steel slag hot-closed treatment system (8) is sent to a steel slag hot-closed backwater well (2); preferably, the generated dust and steam are collected by a gas collecting hood of a dust and gas collecting system (9), and further the dust and gas are treated by a wet electric dust collector.
The strong brine of the iron and steel enterprises comprises strong water which is produced by softening raw water or reverse osmosis, and is produced by reverse osmosis after comprehensive sewage treatment, and preferably does not comprise strong brine, and further comprises concentrated solution which is produced by membrane method and electroosmosis and high-salt-content waste liquid produced in the desulfurization process. Preferably, the pH value of the strong brine of the iron and steel enterprises is 6-9, the total dissolved solid TDS is less than or equal to 5000mg/L, and the COD is less than or equal to 5000mg/L cr 150mg/L or less, 50mg/L or less of ammonia nitrogen, 2000mg/L or less of sulfate, 2000mg/L or less of chloride ion, and 2000mg/L or less of total hardness (CaCO) 3 Meter). Preferably, the steel slag hot-closed water absorbing well (6) needs to periodically detect Cl in the steel slag hot-closed water absorbing well - Concentration of Cl control - The concentration is not more than 3000mg/L, if Cl is contained in the water absorbing well - The concentration is about to exceed 3000mg/L, and the industrial fresh water should be supplemented. Preferably, a slag slurry pump and a liquid level meter are arranged in the steel slag hot-closed backwater well (2), and the start and stop of the slag slurry pump in the steel slag hot-closed backwater well (2) are controlled in linkage with the liquid level of the backwater well. Preferably, the backwater pH value of the steel slag hot-closed backwater well (2) is 11-13, the temperature is 70-95 ℃, and the SS is 200-1000 mg/L. Preferably, a flocculating agent adding system (5) is arranged at the water inlet of the hot-closed sedimentation tank (3), preferably, the flocculating agent adding system (5) is arranged at the water inlet of the inlet end of the hot-closed sedimentation tank (3), and the PAC dosing concentration is 30-100 mg/L and the PAM is 2-10 mg/L.
Wherein, be provided with central transmission mud scraper in the stifle sedimentation tank (3) for scrape the mud of stifle sedimentation tank (3) into deposit Chi Nidou, the sludge pump is carried mud to the mud dehydration of sludge treatment system (4) from sedimentation tank mud bucket and is carried out the mud dehydration, and the mud is sent into secondary slag treatment production line after the dehydration. Preferably, the scale inhibition and dispersion agent of the scale inhibition and dispersion adding system (7) comprises two agents, namely a scale inhibition and dispersion synergistic agent and a compound corrosion inhibition and scale inhibition agent. Preferably, the scale inhibition dispersion synergist is prepared by compounding and mixing an organic polyamine condensate with a surfactant, and adding the mixture into the mixture to concentrate the mixtureThe degree is 20-100 mg/L. Preferably, the composite corrosion and scale inhibitor in the scale inhibitor dispersing and adding system (7) comprises 1-35% of scale inhibitor (one or two of polyaspartic acid and polyepoxysuccinic acid), 1-35% of organic phosphorus carboxylic acid or organic phosphorus sulfonic acid, 1-25% of acrylic copolymer and 20-80% of water, and the adding concentration is 10-50 mg/L. Preferably, the working pressure of the steel slag hot-disintegrating treatment system (8) is 0.3-0.7 Mpa, the treatment hot-disintegrating time is 2-4h, preferably 3h, the content of free calcium oxide (f-CaO) in the treated steel slag is less than 3%, and the soaking expansion rate is less than 1.5%. Preferably, the dust and gas treatment system (9) comprises a movable steel slag hot-disintegrating dust removing device, a fan, a wet electric dust removing system and a telescopic pipeline, wherein the movable steel slag hot-disintegrating dust removing device comprises a movable hood car with a gas collecting hood, the movable hood car is connected with the telescopic pipeline, under the action of the fan, flue gas enters the wet electric dust removing system through the pipeline and is discharged from a chimney, the dust and gas treatment system is remotely controlled by a PLC, and the dust concentration of the discharged dust of the dust removing flue gas is lower than 30mg/m 3
The invention also preferably relates to a device and a method for recycling strong brine to the steel slag hot disintegrating treatment, and belongs to the technical field of environmental protection. The strong brine of the iron and steel enterprises is directly conveyed to a steel slag hot-closed backwater well through a centrifugal pump, is lifted to enter a hot-closed sedimentation tank to be rapidly precipitated through a slag slurry pump after reacting with hot-closed backwater alkali liquor, and the supernatant automatically flows into a steel slag hot-closed water absorbing well, and enters a secondary steel slag treatment production line after sludge in the sedimentation tank is concentrated and dehydrated. Adding a scale inhibiting dispersing agent into a hot-closed water absorbing well to prevent a hot-closed water system from scaling, and collecting dust and steam generated in the steel slag hot-closed process through a gas collecting hood for treatment. The invention can realize the treatment of the strong brine with the lowest cost for iron and steel enterprises and realize the digestion of the strong brine.
The invention also relates to a process method for recycling strong brine to steel slag hot disintegrating treatment, which comprises the following steps:
step (1): the strong brine of the iron and steel enterprises is directly conveyed to a steel slag hot closed backwater well (2);
step (2): the method comprises the steps that hot-closed backwater alkali liquor received from a steel slag hot-closed treatment system (8) in a steel slag hot-closed backwater well (2) is mixed with concentrated brine of a steel enterprise to generate chemical reaction to generate calcium carbonate, the calcium carbonate is pumped into a hot-closed sedimentation tank (3) through a slag slurry pump, a flocculating agent is added into the hot-closed sedimentation tank (3) through a flocculating agent adding system (5) to remove suspended matters, and water in the hot-closed sedimentation tank (3) automatically flows into a steel slag hot-closed water absorbing well (6) for further recycling;
step (3): the sludge generated by the hot stuffy sedimentation tank (3) in the step (2) is dehydrated by a sludge treatment system (4) and then is sent into a secondary steel slag treatment production line; adding a scale inhibition dispersing agent into the steel slag hot-closed water absorbing well (6) through a scale inhibition dispersing and adding system (7), so as to ensure that the steel slag hot-closed treatment system (8) is not scaled;
step (4): the circulating water obtained by adding the scale inhibition and dispersion agent into the steel slag hot-closed water absorbing well (6) and then carrying out post-treatment is sent to a steel slag hot-closed treatment system (8), dust and steam generated by the steel slag hot-closed treatment system (8) are collected and treated by a dust and gas collecting system (9), and hot-closed backwater alkali liquid generated by the steel slag hot-closed treatment system (8) is sent to a steel slag hot-closed backwater well (2).
Preferably, the strong brine is recycled to the slag disintegrating treatment process, which comprises the following steps:
(1) And the strong brine of the iron and steel enterprises is directly conveyed to a steel slag hot-closed water return well.
(2) The hot-closed backwater alkali liquor is mixed with strong brine to generate chemical reaction to generate calcium carbonate, and the calcium carbonate is pumped into a sedimentation tank to remove suspended matters through a slag slurry pump, and then automatically flows into a hot-closed water absorbing well to be further circulated for a steel slag hot-closed treatment system.
(3) And (3) dehydrating sludge generated in the sedimentation tank in the step (2), and then conveying the dehydrated sludge into a secondary steel slag treatment production line. And adding a scale inhibition dispersing agent into the hot-water-absorbing well to ensure that a hot-water-using system does not scale.
(4) And (3) the steel slag hot disintegrating treatment system in the step (2) is characterized in that generated dust and steam are collected through a gas collecting hood and further enter a wet electric dust collector to be subjected to dust and gas treatment.
Wherein, the strong brine of iron and steel enterprises comprises the strong water which is produced by softening raw water or reverse osmosis, and the strong water which is produced by reverse osmosis after comprehensive sewage treatment does not comprise the concentrated solution which is produced by the strong brine further through a membrane method and electroosmosis, and does not comprise the high-salt-content waste liquid produced in the desulfurization process of the iron and steel enterprises.
Wherein the steel slag hot-closed water return well comprises a water return well for roll nip production and a steel slag hot-closed water return well. The concentrated salt water pipeline is provided with an automatic control valve and a metering device, the automatic control valve is linked with the liquid level of the water absorbing well, and the starting and stopping of the slurry pump in the hot-closed water returning well are linked with the liquid level of the water returning well. The backwater of the backwater well is alkaline waste liquid, the pH value is 11-13, the temperature is 70-95 ℃, and the SS is 200-1000 mg/L.
The hot-closed sedimentation tank can be a horizontal sedimentation tank, a radial sedimentation tank and an inclined plate sedimentation tank according to actual conditions, and the radial sedimentation tank is preferred. The water inlet of the radial flow sedimentation tank is provided with a flocculating agent dosing device, the dosing concentration of the flocculating agent is 30-100 mg/L, preferably 50mg/L, and the PAM is 2-10 mg/L, preferably 5mg/L. And (3) quickly precipitating the mixed alkali liquor conveyed from the hot-seal backwater well in a hot-seal sedimentation tank after flocculation reaction. The sedimentation tank is provided with a central transmission mud scraper, a sludge pump conveys sludge from a mud bucket of the sedimentation tank to a sludge dewatering room for sludge dewatering, a plate-and-frame filter press or a belt filter press is selected as sludge dewatering equipment, the water content of the dewatered sludge is 50-70%, and the dewatered sludge is sent to a secondary steel slag treatment production line.
Wherein, the water discharged from the hot-closed sedimentation tank automatically flows into the hot-closed water absorbing well. In order to ensure that a circulating water system, in particular a pipeline, a water pump and a water spraying nozzle are blocked due to scaling, a scale inhibition dispersing agent is added into a water absorbing well. The scale inhibition and dispersion agent comprises two agents, namely a scale inhibition and dispersion synergist and a composite corrosion inhibition and scale inhibition agent. The scale inhibition dispersion synergistic agent is prepared by compounding and mixing an organic polyamine condensate with a surfactant, and the adding concentration is 20-100 mg/L, preferably 50mg/L. The composite corrosion and scale inhibitor comprises 1-35% of scale inhibitor (one or two of polyaspartic acid and polyepoxysuccinic acid), 1-35% of organic phosphorus carboxylic acid or organic phosphorus sulfonic acid, 1-25% of acrylic copolymer and 20-80% of water, wherein the adding concentration is 10-50 mg/L, preferably 25mg/L. The scale inhibition dispersion synergist and the composite corrosion and scale inhibitor are added, so that the problem of scale formation of the steel slag hot-closed circulating water system can be effectively solved.
Wherein, the steel slag hot-disintegrating treatment system comprises a pool type hot-disintegrating treatment system and a tank type hot-disintegrating treatment systemThe pressure-heat-sealing treatment system is preferably a tank-type pressure-heat-sealing treatment system. The tank type pressurized hot disintegrating treatment system comprises two stages of steel slag rolling and crushing and residual heat pressurized hot disintegrating. The rolling crushing stage mainly completes the rapid cooling and crushing of the molten steel slag, the treatment time of the stage is 30min, and the molten steel slag can be cooled from about 1600 ℃ to about 500 ℃ through the treatment of the stage, and the granularity is crushed to below 300 mm; the residual heat pressured hot disintegrating stage mainly completes the stabilization treatment of the steel slag after rolling and crushing, the hot disintegrating time is 3 hours under the working pressure of 0.3-0.7 Mpa, in the process, the organic matters in the strong brine are directly decomposed and gasified under the high temperature environment, the free calcium oxide (f-CaO) and the free magnesium oxide (f-MgO) in the steel slag are fully digested under the saturated steam condition, the content of the free calcium oxide (f-CaO) in the steel slag after treatment is less than 3%, and the soaking expansion rate is less than 1.5%. In order to ensure that the steel slag powder after hot sealing meets the product standard of GB/T20491-2017 steel slag powder for cement and concrete, cl in a water absorbing well should be detected periodically - Concentration of Cl control - If the concentration is not more than 3000mg/L, the concentration of Cl < - > in the water absorbing well is about to be more than 3000mg/L, and the industrial fresh water should be supplemented.
In order to avoid secondary pollution caused by dust and steam in the steel slag hot-disintegrating process, the system is provided with a movable steel slag hot-disintegrating dust removing device, a movable hood car is connected with a telescopic pipeline, under the action of a fan, a flue gas pipeline enters a wet electric dust removing system and is discharged from a chimney, the device is remotely controlled by a PLC (programmable logic controller), the occupied area is small, the automation degree is high, the manual production operation environment in the steel slag hot-disintegrating process is improved, and the dust concentration of dust removing flue gas discharged outside is lower than 30mg/m 3 。
Compared with the prior art, the invention has the following advantages due to the adoption of the technical scheme: (1) The refractory organic matters in the strong brine are gasified and decomposed in the hot disintegrating process of the steel slag, and the carbonate hardness in the strong brine is removed in a sedimentation tank. (2) The chloride ion content in the circulating water is controlled to ensure that the steel slag meets the product standard of GB/T20491-2017 steel slag powder for cement and concrete. (3) Through adding the scale inhibition dispersing agent, the corrosion problem of steel slag hot-disintegrating process equipment is guaranteed (4) through adding a dust hood to a steel slag hot-disintegrating system, dust and gas discharged in the process are collected and treated through a wet electric dust remover, and secondary pollution in the hot-disintegrating process is avoided. (5) The strong brine is recycled to the steel slag hot disintegrating treatment system, the treatment cost is extremely low, and part of the strong brine can be consumed.
Drawings
FIG. 1 is a flow chart of a process for recycling strong brine to steel slag hot-disintegrating treatment of a steel enterprise, which relates to the invention.
Wherein: the method comprises the following steps of 1-strong brine of steel enterprises, 2-hot closed backwater wells, 3-hot closed sedimentation tanks, 4-sludge treatment systems, 5-flocculant adding systems, 6-steel slag hot closed water absorbing wells, 7-scale inhibitor dispersing adding systems, 8-steel slag hot closed treatment systems, 9-dust and gas collecting systems and 10-stabilized steel slag.
Detailed Description
The invention will now be described in detail with reference to the drawings and examples.
Referring to fig. 1, the process for treating the steel slag with the strong brine for recycling the steel slag with the strong brine comprises the following steps:
(1) The strong brine 1 of the iron and steel enterprises is directly conveyed to the steel slag hot closed backwater well 2.
(2) The hot-closed backwater alkali liquor is mixed with strong brine to generate chemical reaction to generate calcium carbonate, and the calcium carbonate is pumped into a hot-closed sedimentation tank 3 through a slag slurry pump to remove suspended matters and then automatically flows into a steel slag hot-closed water absorbing well 6 for further recycling.
(3) And (3) delivering the sludge generated by the hot stuffy sedimentation tank 3 in the step (2) into a secondary steel slag treatment production line after passing through a sludge treatment system 4. And adding the scale inhibition dispersing agent into the steel slag hot-closed water absorbing well 6 through the scale inhibition dispersing agent adding system 7, so as to ensure that the hot-closed water system is not scaled.
(4) And (3) conveying circulating water of the steel slag hot-closed water absorbing well 6 in the step (2) to a steel slag hot-closed treatment system 8, finally obtaining stabilized steel slag 10, further carrying out de-magnetic separation and post-treatment, collecting generated dust and steam through a gas collecting hood, entering a dust and gas collecting system 9, and enabling the stabilized steel slag 10 to enter a steel slag secondary treatment system for magnetic separation and screening.
As shown in fig. 1, a strong brine is reused for a steel slag hot-disintegrating treatment device, and the strong brine is reused for the steel slag hot-disintegrating treatment device, which comprises: a hot-closed backwater well 2, a hot-closed sedimentation tank 3, a sludge treatment system 4, a flocculating agent adding system 5, a steel slag hot-closed water absorbing well 6, a scale inhibitor dispersing adding system 7, a steel slag hot-closed treatment system 8 and a dust and gas collecting system 9; the inlet end of the hot closed backwater well 2 is connected with a concentrated brine pipeline for receiving the concentrated brine of the iron and steel enterprises; the outlet end of the hot-seal backwater well 2 is connected with the inlet end of the hot-seal sedimentation tank 3, and is used for conveying water in the hot-seal backwater well 2 into the hot-seal sedimentation tank 3 for treatment, and the flocculant adding system 5 is in operable connection with the hot-seal sedimentation tank 3 and is used for adding flocculant into the hot-seal sedimentation tank 3; the outlet end of the hot-closed sedimentation tank 3 is connected with the inlet end of the steel slag hot-closed water absorbing well 6, and is used for conveying the water treated by the hot-closed sedimentation tank 3 into the steel slag hot-closed water absorbing well 6 for treatment; the thermal stuffy sedimentation tank 3 is connected with a sludge treatment system 4 and is used for conveying sludge in the thermal stuffy sedimentation tank 3 into the sludge treatment system 4; the scale inhibition and dispersion agent adding system 7 is in operable connection with the steel slag hot-closed water absorbing well 6 and is used for adding the scale inhibition and dispersion agent into the steel slag hot-closed water absorbing well 6; the outlet end of the steel slag hot-closed water absorbing well 6 is connected with a steel slag hot-closed treatment system 8, and is used for conveying circulating water in the steel slag hot-closed water absorbing well 6 to the steel slag hot-closed treatment system 8; the steel slag hot-disintegrating treatment system 8 is connected with the water return end of the hot-disintegrating water return well 2 and is used for enabling the hot-disintegrating water return well 2 to receive hot-disintegrating water return generated by the steel slag hot-disintegrating treatment system 8; the steel slag hot-disintegrating treatment system 8 is connected with a dust and gas collection system 9 and is used for collecting dust and steam generated in the steel slag hot-disintegrating treatment system 8. Wherein, the steel slag hot disintegrating treatment system 8 is connected with a steel slag secondary treatment system and is used for feeding stabilized steel slag 10 obtained by the steel slag hot disintegrating treatment system 8 into the steel slag secondary treatment system for magnetic separation and screening. The outlet end of the hot-closed backwater well 2 is connected with the inlet end of the hot-closed sedimentation tank 3 through a slurry pump, and is used for lifting water in the hot-closed backwater well 2 into the hot-closed sedimentation tank through the slurry pump to quickly sediment.
The strong brine 1 of the iron and steel enterprises comprises strong water which is produced by softening raw water or reverse osmosis, and the strong water which is produced by reverse osmosis after comprehensive sewage treatment, does not comprise concentrated liquid which is produced by the strong brine further through a membrane method and electroosmosis, and does not comprise high produced in the desulfurization process of the iron and steel enterprisesSalt-containing waste liquid. The pH value in the strong brine is 6-9, the total dissolved solid TDS is less than or equal to 5000mg/L, and COD is less than or equal to 5000mg/L cr 150mg/L or less, 50mg/L or less of ammonia nitrogen, 2000mg/L or less of sulfate, 2000mg/L or less of chloride ion, 2000mg/L or less of total hardness (CaCO) or less 3 Meter).
The steel slag hot-closed water return well 2 comprises a water return well for roll nip production and a water return well for steel slag hot-closed. The concentrated salt water pipeline is provided with an automatic control valve and a metering device, the automatic control valve is in liquid level linkage with the water absorbing well 6, and the starting and stopping of a slag slurry pump in the hot closed water returning well is in liquid level linkage with the water returning well 2. The backwater of the backwater well is alkaline waste liquid, the pH value is 11-13, the temperature is 70-95 ℃, and the SS (suspended solids) is 200-1000 mg/L.
The hot-closed sedimentation tank 3 can be a horizontal sedimentation tank, a radial sedimentation tank and an inclined plate sedimentation tank according to actual conditions, and is preferably a radial sedimentation tank. A flocculating agent dosing device is arranged at the water inlet of the radial flow sedimentation tank, the dosing concentration of the flocculating agent is 30-100 mg/L, preferably 50mg/L, and the dosing concentration of PAM (Polyacrylamide) is 2-10 mg/L, preferably 5mg/L. And (3) quickly precipitating the mixed alkali liquor conveyed from the hot-seal backwater well in a hot-seal sedimentation tank after flocculation reaction. The sedimentation tank is provided with a central transmission mud scraper, a sludge pump conveys sludge from a mud bucket of the sedimentation tank to a sludge dewatering room for sludge dewatering, a plate-and-frame filter press or a belt filter press is selected as sludge dewatering equipment, the water content of the dewatered sludge is 50-70%, and the dewatered sludge is sent to a secondary steel slag treatment production line.
The steel slag hot-closed water absorbing well 6 is of a semi-underground structure, and water discharged from the hot-closed sedimentation tank automatically flows into the hot-closed water absorbing well. In order to ensure that a circulating water system, in particular a pipeline, a water pump and a water spraying nozzle are blocked due to scaling, a scale inhibition dispersing agent is added into a water absorbing well. The scale inhibition and dispersion agent comprises two agents, namely a scale inhibition and dispersion synergist and a composite corrosion inhibition and scale inhibition agent. The scale inhibition dispersion synergistic agent is prepared by compounding and mixing an organic polyamine condensate with a surfactant, and the adding concentration is 20-100 mg/L, preferably 50mg/L. The composite corrosion and scale inhibitor comprises 1-35% of scale inhibitor (one or two of polyaspartic acid and polyepoxysuccinic acid), 1-35% of organic phosphorus carboxylic acid or organic phosphorus sulfonic acid, 1-25% of acrylic copolymer and 20-80% of water, wherein the adding concentration is 10-50 mg/L, preferably 25mg/L. The scale inhibition dispersion synergist and the composite corrosion and scale inhibitor are added, so that the problem of scale formation of the steel slag hot-closed circulating water system can be effectively solved. Preferably, composite corrosion and scale inhibitors known in the art may be used in the present invention.
The steel slag hot-disintegrating treatment system 8 comprises a pool type hot-disintegrating treatment system and a tank type pressurized hot-disintegrating treatment system, and is preferably a tank type pressurized hot-disintegrating treatment system. The tank type pressurized hot disintegrating treatment system comprises two stages of steel slag rolling and crushing and residual heat pressurized hot disintegrating. The rolling crushing stage mainly completes the rapid cooling and crushing of the molten steel slag, the treatment time of the stage is 30min, and the molten steel slag can be cooled from about 1600 ℃ to about 500 ℃ through the treatment of the stage, and the granularity is crushed to below 300 mm; the residual heat pressured hot disintegrating stage mainly completes the stabilization treatment of the steel slag after rolling and crushing, the hot disintegrating time is 2-4h under the working pressure of 0.3-0.7 Mpa, in the process, the organic matters in the strong brine are directly decomposed and gasified under the high temperature environment, the free calcium oxide (f-CaO) and the free magnesium oxide (f-MgO) in the steel slag are fully digested under the saturated steam condition, the content of the free calcium oxide (f-CaO) in the steel slag after treatment is less than 3%, and the soaking expansion rate is less than 1.5%. In order to ensure that the steel slag powder after hot sealing meets the product standard of GB/T20491-2017 steel slag powder for cement and concrete, cl in a water absorbing well should be detected periodically - Concentration of Cl control - The concentration is not more than 3000mg/L, if Cl is contained in the water absorbing well - The concentration is about to exceed 3000mg/L, and the industrial fresh water should be supplemented.
In order to avoid secondary pollution, the system is provided with a movable steel slag hot-disintegrating dust removing device, a movable hood car is connected with a telescopic pipeline, a flue gas pipeline enters a wet electric dust removing system and is discharged from a chimney under the action of a fan, the device is remotely controlled by a PLC (programmable logic controller), the occupied area is small, the automation degree is high, the manual production operation environment in the steel slag hot-disintegrating process is improved, and the dust concentration of dust removing flue gas is lower than 30mg/m 3 。
Further description will be given below by way of specific examples.
Example 1:
selecting concentrated water obtained by reverse osmosis treatment of raw water of certain iron and steel enterprise in Hebei province, detecting pH of the concentrated water to be 8.41, and Total Dissolved Solids (TDS) to be 1430mg/L, COD cr 61mg/L of ammonia nitrogen 0.9mg/L, 510mg/L of sulfate, 328mg/L of chloride ion and 1083mg/L of total hardness (CaCO) 3 Meter).
Taking the concentrated water flow to be 20m 3 And/h, conveying the steel slag to a steel slag hot-closed backwater well, wherein the water temperature of the steel slag hot-closed backwater well is reduced from 90 ℃ to 75 ℃, the backwater well suspended matters (SS) are 458mg/L, and the pH is 11.56.
The PAC addition concentration of the thermal-distress sedimentation tank is 30mg/L, the PAM addition concentration is 5mg/L, and the SS of the sedimentation tank effluent is 42mg/L. The adding concentration of the scale inhibition and dispersion synergist of the hot-closed water absorption well is 30mg/L, the adding concentration of the scale inhibition and dispersion agent is 15mg/L, and the pipeline and the spray nozzle are not scaled after running for a plurality of days.
Through detection, the pH value of the water absorbing well is 11.30, the total dissolved solid TDS is 3340mg/L, and the COD is cr 35mg/L of ammonia nitrogen 0.3mg/L, sulfate 1535mg/L, chloride 1036mg/L, total hardness 473mg/L (CaCO) 3 Meter).
By detecting Cl in steel slag - The content of Cl in the steel slag required in the product standard of GB/T20491-2017 steel slag powder for cement and concrete is 0.029 percent - The content is not more than 0.06%, and the concentration of dust discharged from the dedusting smoke is 18mg/m 3 。
Example 2:
reverse osmosis concentrated water after comprehensive sewage treatment of a certain Hebei iron and steel enterprise is selected, the pH value of the concentrated water is detected to be 7.75, the Total Dissolved Solids (TDS) is 3150mg/L, and the COD is detected cr 119mg/L, 25mg/L ammonia nitrogen, 1260mg/L sulfate, 1021mg/L chloride ion, 1573mg/L total hardness (CaCO) 3 Meter).
Taking the concentrated water flow to be 20m 3 And/h, conveying the steel slag to a steel slag hot-closed backwater well, wherein the water temperature of the steel slag hot-closed backwater well is reduced from 90 ℃ to 75 ℃, the backwater well suspended matters (SS) are 573mg/L, and the pH is 11.35.
The PAC addition concentration of the thermal-distress sedimentation tank is 50mg/L, the PAM addition concentration is 5mg/L, and the SS of the sedimentation tank effluent is 35mg/L. The adding concentration of the scale inhibition and dispersion synergist of the hot-closed water absorption well is 50mg/L, the adding concentration of the scale inhibition and dispersion agent is 15mg/L, and the pipeline and the spray nozzle are not scaled after running for a plurality of days.
Through detection, the pH value of the water absorbing well is 11.12, the total dissolved solid TDS is 5936mg/L, and the COD is cr 56mg/L of ammonia nitrogen, 4.5mg/L of sulfate, 2475mg/L of chloride ion, 2133mg/L of total hardness, 526mg/L of CaCO (CaCO) 3 Meter).
By detecting Cl in steel slag - The content of Cl in the steel slag required in the product standard of GB/T20491-2017 steel slag powder for cement and concrete is 0.046 percent - The content is not more than 0.06%, and the concentration of the discharged dust of the dedusting smoke is 19mg/m 3 。

Claims (21)

1. The hot disintegrating treatment process of the concentrated salt water reused in steel slag includes the following steps:
step (1): the strong brine of the iron and steel enterprises is directly conveyed to a steel slag hot closed backwater well (2);
step (2): the method comprises the steps that hot-closed backwater alkali liquor received from a steel slag hot-closed treatment system (8) in a steel slag hot-closed backwater well (2) is mixed with concentrated brine of a steel enterprise to generate chemical reaction to generate calcium carbonate, the calcium carbonate is pumped into a hot-closed sedimentation tank (3) through a slag slurry pump, a flocculating agent is added into the hot-closed sedimentation tank (3) through a flocculating agent adding system (5) to remove suspended matters, and water in the hot-closed sedimentation tank (3) automatically flows into a steel slag hot-closed water absorbing well (6) for further recycling; step (3): the sludge generated by the hot stuffy sedimentation tank (3) in the step (2) is dehydrated by a sludge treatment system (4) and then is sent into a secondary steel slag treatment production line; adding a scale inhibition dispersing agent into the steel slag hot-closure water absorbing well (6) through a scale inhibition dispersing and adding system (7), so as to ensure that a hot-closure water system of the steel slag hot-closure treatment system (8) is not scaled;
step (4): the circulating water obtained by adding the scale inhibition and dispersion agent into the steel slag hot-closed water absorbing well (6) and then carrying out post-treatment is sent to a steel slag hot-closed treatment system (8), dust and steam generated by the steel slag hot-closed treatment system (8) are collected and treated by a dust and gas collecting system (9), and hot-closed backwater alkali liquid generated by the steel slag hot-closed treatment system (8) is sent to a steel slag hot-closed backwater well (2).
2. The method according to claim 1, wherein the strong brine of the iron and steel enterprises comprises strong brine produced by softening or reverse osmosis raw water, strong brine produced by reverse osmosis after comprehensive sewage treatment, and the strong brine does not comprise concentrated solution produced by further membrane method and electroosmosis and high-salt-content waste liquid produced in desulfurization.
3. The method according to any one of claims 1 to 2, wherein the pH of the strong brine of the iron and steel enterprise is 6-9, the total dissolved solids TDS is less than or equal to 5000mg/L, COD cr 150mg/L or less, 50mg/L or less of ammonia nitrogen, 2000mg/L or less of sulfate, 2000mg/L or less of chloride ions and 2000mg/L or less of total hardness.
4. The method according to any one of claims 1-2, wherein the periodic detection of Cl in a steel slag hot-fill suction well is required - Concentration of Cl control - The concentration is not more than 3000mg/L, if Cl is contained in the water absorbing well - The concentration is about to exceed 3000mg/L, and the industrial fresh water should be supplemented.
5. The method according to one of claims 1 to 2, wherein a slag slurry pump and a liquid level meter are arranged in the steel slag hot-closed backwater well (2), and the start and stop of the slag slurry pump in the steel slag hot-closed backwater well (2) are controlled in linkage with the liquid level of the backwater well.
6. The method according to any one of claims 1 to 2, wherein the backwater pH of the steel slag hot-closed backwater well (2) is 11 to 13, the temperature is 70 to 95 ℃, and the SS is 200 to 1000mg/L.
7. Method according to one of claims 1-2, characterized in that the water inlet of the hot-closed sedimentation tank (3) is provided with a flocculant dosing system (5).
8. The method according to claim 7, wherein the flocculant adding system (5) is arranged at the water inlet of the inlet end of the hot-closed sedimentation tank (3), the PAC adding concentration is 30-100 mg/L, and the PAM concentration is 2-10 mg/L.
9. The method according to any one of claims 1-2, characterized in that dust and steam generated by the steel slag hot-closed treatment system (8) is collected by a gas collecting hood of a dust and gas collecting system (9), and further subjected to dust and gas treatment by a wet electric precipitator.
10. Method according to one of the claims 1-2, characterized in that a centre drive sludge scraper is arranged in the hot-closed sedimentation tank (3) for scraping the sludge of the hot-closed sedimentation tank (3) into the sediment Chi Nidou, a sludge pump conveys the sludge from the sludge hopper of the sedimentation tank to a sludge dewatering room of the sludge treatment system (4) for sludge dewatering, and the dewatered sludge is fed into a secondary steel slag treatment production line.
11. The method according to one of claims 1 to 2, characterized in that the scale-inhibiting dispersant of the scale-inhibiting agent dispersion dosing system (7) comprises two agents, a scale-inhibiting dispersion synergist and a composite corrosion-inhibiting scale-inhibiting agent.
12. The method of claim 11, wherein the scale inhibition dispersion synergist is prepared by compounding and mixing an organic polyamine condensate with a surfactant, and the adding concentration is 20-100 mg/L.
13. The method according to claim 12, wherein the composite corrosion and scale inhibitor in the scale inhibitor dispersion dosing system (7) comprises, based on total weight: 1-35% of scale inhibitor, 1-35% of organic phosphorus carboxylic acid or organic phosphorus sulfonic acid, 1-25% of acrylic copolymer and 20-80% of water; the adding concentration is 10-50 mg/L.
14. The method according to any one of claims 1 to 2, wherein the working pressure of the steel slag hot-disintegrating treatment system (8) is 0.3 to 0.7MPa, the hot-disintegrating time is 1 to 2 hours, the free calcium oxide content of the steel slag after treatment is less than 3%, and the soaking expansion rate is less than 1.5%.
15. The method according to any one of claims 1-2, characterized in that the dust and gas collection system (9) comprises a mobile slag hot-disintegrating dust removal device, a fan, a wet electric dust removal system and a telescopic pipeline, the mobile slag hot-disintegrating dust removal device comprises a mobile hood car with a gas collection hood, the mobile hood car is connected with the telescopic pipeline, under the action of the fan, flue gas enters the wet electric dust removal system through the pipeline and is discharged from a chimney, the dust and gas collection system is remotely controlled by a PLC, and the dust concentration of the discharged dust of the dust removed flue gas is lower than 30mg/m 3 。
16. The utility model provides a strong brine returns to slag hot disintegrating treatment device which characterized in that, strong brine returns to slag hot disintegrating treatment device includes: the device comprises a steel slag hot-closed backwater well (2), a hot-closed sedimentation tank (3), a sludge treatment system (4), a flocculating agent adding system (5), a steel slag hot-closed water absorbing well (6), a scale inhibitor dispersing adding system (7), a steel slag hot-closed treatment system (8) and a dust and gas collecting system (9); the inlet end of the steel slag hot closed backwater well (2) is connected with a concentrated brine pipeline for receiving the concentrated brine of the iron and steel enterprises; the outlet end of the steel slag hot-closed backwater well (2) is connected with the inlet end of the hot-closed sedimentation tank (3) and is used for conveying water in the steel slag hot-closed backwater well (2) into the hot-closed sedimentation tank (3) for treatment, and the flocculant adding system (5) is in operable connection with the hot-closed sedimentation tank (3) and is used for adding flocculant into the hot-closed sedimentation tank (3); the outlet end of the hot-closed sedimentation tank (3) is connected with the inlet end of the steel slag hot-closed water absorbing well (6) and is used for conveying the water treated by the hot-closed sedimentation tank (3) into the steel slag hot-closed water absorbing well (6) for treatment; the hot closed sedimentation tank (3) is connected with the sludge treatment system (4) and is used for conveying the sludge in the hot closed sedimentation tank (3) into the sludge treatment system (4); the scale inhibition and dispersion agent adding system (7) is in operable connection with the steel slag hot-closed water absorbing well (6) and is used for adding the scale inhibition and dispersion agent into the steel slag hot-closed water absorbing well (6); the outlet end of the steel slag hot-closed water absorbing well (6) is connected with a steel slag hot-closed treatment system (8) and is used for conveying circulating water in the steel slag hot-closed water absorbing well (6) to the steel slag hot-closed treatment system (8); the steel slag hot-disintegrating treatment system (8) is connected with the water return end of the steel slag hot-disintegrating water return well (2) and is used for enabling the steel slag hot-disintegrating water return well (2) to receive hot-disintegrating water generated by the steel slag hot-disintegrating treatment system (8); the steel slag hot-disintegrating treatment system (8) is connected with a dust and gas collection system (9) and is used for collecting dust and steam generated in the steel slag hot-disintegrating treatment system (8); dust and steam generated by the steel slag hot-disintegrating treatment system (8) are collected through a gas collecting hood of a dust and gas collecting system (9), and dust and gas treatment is further carried out through a wet electric dust collector.
17. The strong brine recycling steel slag hot-disintegrating treatment device according to claim 16, wherein the steel slag hot-disintegrating treatment system (8) is connected with a steel slag secondary treatment system and is used for feeding stabilized steel slag (10) obtained by the steel slag hot-disintegrating treatment system (8) into the steel slag secondary treatment system for magnetic separation and screening.
18. The strong brine is recycled to the steel slag hot-disintegrating treatment device according to claim 16, wherein the outlet end of the steel slag hot-disintegrating backwater well (2) is connected with the inlet end of the hot-disintegrating sedimentation tank (3) through a slag slurry pump, and the strong brine is used for lifting water in the steel slag hot-disintegrating backwater well (2) into the hot-disintegrating sedimentation tank through the slag slurry pump to be quickly sedimentated.
19. The apparatus of claim 16, wherein the brine pipeline is provided with an automatic control valve and a metering device.
20. The strong brine is recycled to the steel slag hot disintegrating treatment device according to claim 16, wherein the hot disintegrating sedimentation tank (3) is a horizontal sedimentation tank, a radial sedimentation tank or an inclined plate sedimentation tank; supernatant effluent of the hot-closed sedimentation tank (3) automatically flows into a steel slag hot-closed water absorbing well (6) through a pipeline.
21. The strong brine is recycled to the steel slag hot-disintegrating treatment device, and the steel slag hot-disintegrating treatment system (8) comprises a pool type hot-disintegrating treatment system and a tank type pressurized hot-disintegrating treatment system.
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CN113003832A (en) * 2021-03-16 2021-06-22 中冶节能环保有限责任公司 Method for treating high-salinity water in steel plant
CN114291936A (en) * 2022-01-13 2022-04-08 中冶南方工程技术有限公司 Converter hot-stewing slag wastewater treatment system

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CN102432122A (en) * 2011-11-01 2012-05-02 中冶建筑研究总院有限公司 Method for treating circulating water
CN103058412A (en) * 2012-12-26 2013-04-24 宝钢集团广东韶关钢铁有限公司 Hot stewing circulating water treatment process for steel slag
CN103130358B (en) * 2013-03-15 2014-09-10 中冶建筑研究总院有限公司 Steel slag hot-disintegration circulating water treatment device
CN103449597A (en) * 2013-09-05 2013-12-18 鞍钢股份有限公司 Converter slag hot-stuffy backwater treatment device and method
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CN111154932A (en) * 2020-01-06 2020-05-15 中冶东方工程技术有限公司 Mobile cover vehicle and treatment method for water-containing dust in steel slag hot disintegration process
CN212270140U (en) * 2020-05-29 2021-01-01 中冶建筑研究总院有限公司 Strong brine is recycled and is used for slag hot stuffy processing apparatus

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