CN111500803A - Hot-disintegrating treatment device and method for recycling strong brine in steel slag - Google Patents
Hot-disintegrating treatment device and method for recycling strong brine in steel slag Download PDFInfo
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- CN111500803A CN111500803A CN202010472912.4A CN202010472912A CN111500803A CN 111500803 A CN111500803 A CN 111500803A CN 202010472912 A CN202010472912 A CN 202010472912A CN 111500803 A CN111500803 A CN 111500803A
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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
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- 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
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- 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
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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
- C21B3/08—Cooling slag
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- 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
Abstract
The invention relates to a hot stuffiness treatment device and a hot stuffiness treatment method for recycling strong brine for steel slag, belonging to the technical field of environmental protection. Strong brine of iron and steel enterprises is directly conveyed to a steel slag hot stuffy backwater well through a centrifugal pump, is lifted by a slurry pump to enter a hot stuffy sedimentation tank for rapid sedimentation after reacting with hot stuffy backwater alkali liquor, supernatant automatically flows into the steel slag hot stuffy water absorption well, sludge in the sedimentation tank enters a secondary steel slag treatment production line after being concentrated and dehydrated. And adding a scale inhibition dispersing agent into the hot stuffy water absorption well to prevent the hot stuffy water system from scaling, and collecting and treating dust and steam generated in the hot stuffy process of the steel slag through a gas collecting hood. The invention can realize that iron and steel enterprises process the strong brine with the lowest cost and realize the absorption of the strong brine.
Description
Technical Field
The invention relates to a wastewater treatment and recycling method, in particular to a hot stuffiness treatment device and a treatment method for recycling strong brine for steel slag.
Background
The steel industry is a water consumer and is one of the most serious industries of environmental pollution. With the development of the steel industry, the scale of steel enterprises has increased from 5220 million tons of steel production in 1986 to nearly 9 million tons in 2018. The large increase in steel production also aggravates the increase in water usage, making the otherwise scarce water resource more scarce. In order to reduce the new water intake per ton of steel and improve the water reuse rate, each large iron and steel enterprise establishes an independent wastewater treatment system in each process, and then establishes a comprehensive sewage treatment plant to completely recycle and reuse the factory sewage. The salt content of the effluent after the comprehensive sewage treatment is high, the effluent is recycled as make-up water of circulating cooling water in each process, enterprises have to select ultrafiltration reverse osmosis to carry out desalination treatment on the comprehensive sewage, and 20-30% of high-salt-content wastewater is inevitably generated in the desalination process. The main water quality characteristics of the high-salt-content wastewater of the iron and steel enterprises are as follows: high salt content, high hardness and partial organic pollutant content.
At present, high salt content water is used in cascade or directly discharged, and along with the original stricter emission standard and supervision, more and more enterprises consider to treat the strong brine or consume the strong brine in a plant area. The common treatment method of strong brine at present mainly comprises the steps of pretreatment softening, further membrane concentration and finally evaporation crystallization.
The 'treatment method of high-salt-content wastewater' (CN104692574A) disclosed in 6/10/2015 discloses a treatment method of salt-content wastewater, which mainly comprises the steps of coupling a high-density sedimentation tank and a multi-section ion exchange resin system with membrane methods such as Ultrafiltration (UF), Nanofiltration (NF), Reverse Osmosis (RO) and a high-pressure flat membrane, and finally carrying out MVR (mechanical vapor recompression) evaporative crystallization or freeze crystallization. The operation of the treatment process is complex, and the investment cost and the operation cost of equipment are high.
"a steel industry strong brine processing apparatus and method" (CN108975565A) that 12.11.2018 disclose a steel industry strong brine processing apparatus and method, this processing apparatus includes in proper order: the novel seawater desalination system comprises a strong brine Reverse Osmosis (RO) system, a Nanofiltration (NF) system, a reverse osmosis seawater desalination (SWRO) system, a Nanofiltration (NF) concentrated 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) concentrated water tank and the reverse osmosis seawater desalination system, and the reverse osmosis seawater desalination system is connected with the new water tank. The treatment process can achieve energy recovery, but there is no mention of how Nanofiltration (NF) concentrate and SWRO concentrate are treated.
"zero-emission process and equipment for treating high-salt-content wastewater" (CN107381885A) disclosed in 24.11.2017 discloses a zero-emission process for treating high-salt-content wastewater. 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 using a micro-electrolysis bipolar membrane device, desalting salt by using a reverse osmosis device, and finally obtaining desalted water and acid and sodium hydroxide commodities.
In fact, the potential consumers of high salt-containing wastewater in the steel industry, namely the hot-smoldering treatment process of converter slag. During the treatment process of the converter steel slag, 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 hardness of high-concentration carbonate in concentrated brine is removed in the alkali liquor through reaction. However, the influence of the reuse of the strong brine in the steel slag hot disintegration process on the quality of steel slag products, the scaling influence on a steel slag hot disintegration water pipeline and the problem of secondary pollution caused by pollutant transfer become main limiting factors.
Disclosure of Invention
Aiming at the problems of complex process of strong brine treatment, high construction cost and operation cost and frequent membrane system cleaning of the existing iron and steel enterprises. The invention provides a process method for reusing strong brine in hot disintegration treatment of steel slag, controls the quality in the process, can effectively solve the problem of tail end digestion of the strong brine, and does not generate adverse effect on the hot disintegration process of the steel slag.
In order to solve the technical problem, the invention provides a strong brine recycling device for hot disintegration treatment of steel slag, which comprises: the system comprises a hot stuffy backwater well (2), a hot stuffy sedimentation tank (3), a sludge treatment system (4), a flocculating agent feeding system (5), a steel slag hot stuffy water absorption well (6), a scale inhibitor dispersing and feeding system (7), a steel slag hot stuffy treatment system (8) and a dust and gas collection system (9); the inlet end of the hot stuffy water return well (2) is connected with a strong brine pipeline and is used for receiving strong brine of a steel enterprise; the outlet end of the hot stuffy water return well (2) is connected with the inlet end of the hot stuffy sedimentation tank (3) and is used for conveying water in the hot stuffy water return well (2) into the hot stuffy sedimentation tank (3) for treatment, and the flocculating agent adding system (5) is operably connected with the hot stuffy sedimentation tank (3) and is used for adding flocculating agent into the hot stuffy sedimentation tank (3); the outlet end of the hot stuffy sedimentation tank (3) is connected with the inlet end of the steel slag hot stuffy water absorption well (6) and is used for sending the water treated by the hot stuffy sedimentation tank (3) into the steel slag hot stuffy water absorption well (6) for treatment; the hot stuffy deposition tank (3) is connected with the sludge treatment system (4) and is used for conveying the sludge in the hot stuffy deposition tank (3) into the sludge treatment system (4); the scale inhibition and dispersion agent adding system (7) is operatively connected with the steel slag hot closed suction well (6) and is used for adding the scale inhibition and dispersion agent into the steel slag hot closed suction well (6); the outlet end of the steel slag hot stuffy water absorption well (6) is connected with the steel slag hot stuffy processing system (8) and is used for conveying the circulating water in the steel slag hot stuffy water absorption well (6) to the steel slag hot stuffy processing system (8); the hot stuffy backwater well (2) is used for receiving the hot stuffy backwater generated by the hot stuffy slag treatment system (8) by the hot stuffy backwater well (2); the steel slag hot stuffy processing system (8) is connected with the dust and gas collecting system (9) and is used for collecting the dust and steam generated in the steel slag hot stuffy processing system (8).
The steel slag hot disintegration treatment system (8) is connected with the steel slag secondary treatment system and used for sending the stabilized steel slag (10) obtained by the steel slag hot disintegration treatment system (8) into the steel slag secondary treatment system for magnetic separation and screening.
Wherein, the exit end of hot stuffy return water well (2) passes through the entry end of slurry pump connection hot stuffy sedimentation tank (3) for promote the water that gets into the quick sediment of hot stuffy sedimentation tank through the slurry pump with the water in hot stuffy return water well (2). Wherein, strong brine pipeline is equipped with automatic control valve and metering device. Wherein the hot stuffy sedimentation tank (3) is a horizontal sedimentation tank, a radial sedimentation tank or an inclined plate sedimentation tank. Wherein, the supernatant effluent of the hot stuffy sedimentation tank (3) automatically flows into the hot stuffy water absorption well (6) through a pipeline. Wherein, the steel slag hot stuffy processing system (8) comprises a tank type hot stuffy processing system and a tank type pressure hot stuffy processing system.
In order to solve the technical problems, the invention also provides a method for reusing the strong brine for hot-disintegration treatment of steel slag, preferably a method for treating by adopting the device, which comprises the following steps:
step (1): the strong brine of the iron and steel enterprise is directly conveyed to the steel slag hot-closed water return well (2);
step (2): hot stuffy backwater alkali liquor received from a steel slag hot stuffy treatment system (8) in a steel slag hot stuffy backwater well (2) is mixed with strong brine of an iron and steel enterprise to generate a chemical reaction to generate calcium carbonate, the calcium carbonate is sent to a hot stuffy sedimentation tank (3), preferably sent to the hot stuffy sedimentation tank (3) through a slurry pump, and after a flocculating agent is added into the hot stuffy sedimentation tank (3) through a flocculating agent adding system (5) to remove suspended matters, water in the hot stuffy sedimentation tank (3) automatically flows into a steel slag hot stuffy water absorption well (6) to be further recycled;
and (3): sludge generated in the hot stuffy sedimentation tank (3) in the step (2) is dehydrated by a sludge treatment system (4) and then is sent to a secondary steel slag treatment production line; adding a scale inhibition dispersing agent into the steel slag hot closed water absorption well (6) through a scale inhibition agent dispersing and adding system (7) to ensure that a steel slag hot closed treatment system (8) does not scale; preferably, the hot stuffy water system of the steel slag hot stuffy processing system (8) is ensured not to be scaled;
and (4): circulating water obtained by adding a scale inhibition dispersant into the steel slag hot-closed water absorption well (6) and then treating the mixture is delivered 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 return water alkali liquor generated by the steel slag hot-closed treatment system (8) is delivered to a steel slag hot-closed return water 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 treated by a wet electric dust collector.
The concentrated brine of the iron and steel enterprise comprises concentrated water produced by softening or reverse osmosis of raw water, concentrated water produced by reverse osmosis after comprehensive sewage treatment, preferably concentrated solution obtained by further performing membrane method and electrodialysis on the concentrated brine and high-salinity waste liquid produced in the desulfurization process, wherein the pH of the concentrated brine of the iron and steel enterprise is 6-9, and the total dissolved solid TDS is less than or equal to 5000 mg/Lcr150 mg/L or less, 50 mg/L or less, 2000 mg/L or less sulfate, 2000 mg/L or less chloride ion and 2000 mg/L or less total hardness (CaCO3Meter). Preferably, the steel slag hot closed water absorption well (6) needs to periodically detect Cl in the steel slag hot closed water absorption well-Concentration, control of Cl-Concentration not exceeding 3000 mg/L if Cl is in the suction well-Preferably, the backwater pH of the steel slag hot stuffy backwater well (2) is 11-13, the temperature is 70-95 ℃, and the SS is 200-1000 mg/L. preferably, a flocculant adding system (5) is arranged at a water inlet of the hot stuffy sedimentation tank (3), and a flocculant adding system (5) is preferably arranged at a water inlet of the hot stuffy sedimentation tank (3), and the PAC dosing concentration is 30-100 mg/L and is 2-10 mg/L.
Wherein, a central transmission mud scraper is arranged in the hot disintegrating sedimentation tank (3) and is used for scraping the mud in the hot disintegrating sedimentation tank (3) into a mud hopper of the sedimentation tank, and a mud pump is used for pumping the mud from the sedimentation tankThe method comprises the steps that sludge is conveyed to a sludge dewatering room of a sludge treatment system (4) by a bucket to be dewatered, the dewatered sludge is conveyed to a secondary steel slag treatment production line, preferably, a scale inhibition dispersing agent of a scale inhibition dispersing and adding system (7) comprises two medicaments of a scale inhibition dispersing synergist and a composite corrosion and scale inhibitor, preferably, the scale inhibition dispersing synergist is prepared by compounding an organic polyamine condensate and mixing a surfactant, the adding concentration is 20-100 mg/L, preferably, the composite corrosion and scale inhibitor in the scale inhibition dispersing and adding system (7) comprises 1-35% of a 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, the adding concentration is 10-50 mg/L based on the total weight, preferably, the working pressure of the steel slag hot closed treatment system (8) is 0.3-0.7 MPa, the hot closed treatment time is 2-4h, preferably 3h, the content of free calcium oxide (f-CaO) of the treated steel slag is less than 3%, the water expansion CaO of the treated steel slag is less than 1.5, the treated gas enters a gas collection system, the fume dust collection system, the fume treatment system is preferably, the fume dust collection system through a fume exhaust gas collection system, a fume exhaust gas exhaust system, a fume exhaust gas exhaust system, a fume exhaust gas exhaust3
Preferably, the invention also relates to a device and a method for recycling the strong brine for hot disintegration treatment of the steel slag, belonging to the technical field of environmental protection. Strong brine of iron and steel enterprises is directly conveyed to a steel slag hot stuffy backwater well through a centrifugal pump, is lifted by a slurry pump to enter a hot stuffy sedimentation tank for rapid sedimentation after reacting with hot stuffy backwater alkali liquor, supernatant automatically flows into the steel slag hot stuffy water absorption well, sludge in the sedimentation tank enters a secondary steel slag treatment production line after being concentrated and dehydrated. And adding a scale inhibition dispersing agent into the hot stuffy water absorption well to prevent the hot stuffy water system from scaling, and collecting and treating dust and steam generated in the hot stuffy process of the steel slag through a gas collecting hood. The invention can realize that iron and steel enterprises process the strong brine with the lowest cost and realize the absorption of the strong brine.
Preferably, the invention also relates to a hot-closed treatment process method for reusing the strong brine in the steel slag, which comprises the following steps:
step (1): the strong brine of the iron and steel enterprise is directly conveyed to the steel slag hot-closed water return well (2);
step (2): hot stuffy backwater alkali liquor received from a steel slag hot stuffy processing system (8) in a steel slag hot stuffy backwater well (2) is mixed with strong brine of a steel enterprise to generate a chemical reaction to generate calcium carbonate, the calcium carbonate is conveyed into a hot stuffy sedimentation tank (3) through a slag slurry pump, a flocculating agent is added into the hot stuffy sedimentation tank (3) through a flocculating agent adding system (5) to remove suspended matters, and then water in the hot stuffy sedimentation tank (3) automatically flows into a steel slag hot stuffy water absorption well (6) to be further recycled;
and (3): sludge generated in the hot stuffy sedimentation tank (3) in the step (2) is dehydrated by a sludge treatment system (4) and then is sent to a secondary steel slag treatment production line; adding a scale inhibition dispersing agent into the steel slag hot closed water absorption well (6) through a scale inhibition agent dispersing and adding system (7) to ensure that a steel slag hot closed treatment system (8) does not scale;
and (4): circulating water obtained by adding a scale inhibition and dispersion agent into the steel slag hot-closed water absorption well (6) and then treating the mixture is delivered 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 return water alkali liquor generated by the steel slag hot-closed treatment system (8) is delivered to a steel slag hot-closed return water well (2).
Preferably, the strong brine is recycled for the slag disintegrating treatment process of the steel slag, and the process comprises the following steps:
(1) and directly conveying the strong brine to a steel slag hot-disintegration backwater well in the iron and steel enterprises.
(2) The hot stuffy backwater alkali liquor and the strong brine are mixed to generate a chemical reaction to generate calcium carbonate, and the calcium carbonate is conveyed to a sedimentation tank through a slag slurry pump to remove suspended matters and then automatically flows into a hot stuffy water absorption well to be further recycled for a steel slag hot stuffy treatment system.
(3) And (3) dewatering the sludge generated in the sedimentation tank in the step (2) and then sending the sludge into a secondary steel slag treatment production line. And a scale inhibition and dispersion agent is added into the hot stuffy water absorption well, so that the hot stuffy water system is prevented from scaling.
(4) And (3) in the steel slag hot-closed treatment system in the step (2), the generated dust and steam are collected through the gas collecting hood and further enter the wet electric dust collector for dust and gas treatment.
The concentrated brine of the iron and steel enterprise comprises concentrated water produced by raw water after softening or reverse osmosis, concentrated water produced by reverse osmosis after comprehensive sewage treatment, concentrated solution produced by concentrated brine through membrane method and electrodialysis, and high-salt-content waste liquid produced in the desulfurization process of the iron and steel enterprise.
The steel slag hot-closed water return well comprises a roll nip production water return well and a steel slag hot-closed water return well, the strong brine 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 suction well, the start and stop of a slag slurry pump in the hot-closed water return well are linked with the liquid level of the water return well, the return water of the water return 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 disintegrating sedimentation tank can be a horizontal flow sedimentation tank, a radial flow sedimentation tank and an inclined plate sedimentation tank according to actual conditions, preferably the radial flow sedimentation tank is arranged, a flocculating agent dosing device is arranged at a water inlet of the radial flow sedimentation tank, the flocculating agent dosing concentration is PAC (polyaluminium chloride) of 30-100 mg/L, preferably 50 mg/L of 2-10 mg/L, preferably 5 mg/L, mixed alkali liquor conveyed from the hot disintegrating water return well is subjected to flocculation reaction and then rapidly sedimentated in the hot disintegrating sedimentation tank, 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, the sludge dewatering equipment can be a plate-and-frame filter press or a belt-type filter press, the water content of the dewatered sludge is 50-70%, and the sludge is conveyed.
In order to ensure that a circulating water system, particularly a pipeline, a water pump and a water pumping nozzle are blocked due to scaling, a scale inhibition and dispersion agent is added into the water pumping well, wherein the scale inhibition and dispersion agent comprises a scale inhibition and dispersion synergist and a composite corrosion and scale inhibitor, the scale inhibition and dispersion synergist is prepared from an organic polyamine condensate compound mixed surfactant, the adding concentration is 20-100 mg/L, preferably 50 mg/L, the composite corrosion and scale inhibitor comprises 1-35% of a 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, the adding concentration is 10-50 mg/L, preferably 25 mg/L by taking the total weight as a reference.
Wherein, the hot stuffy processing system of slag, including pond formula hot stuffy processing system and jar formula have pressure hot stuffy processing system, preferred jar formula has pressure hot stuffy processing system. The pot-type pressure hot stuffiness treatment system comprises two stages of steel slag rolling crushing and waste heat pressure hot stuffiness. The rolling and crushing stage is mainly used for rapidly cooling and crushing the molten steel slag, the processing time of the stage is 30min, the molten steel slag can be cooled from about 1600 ℃ to about 500 ℃ through the processing of the stage, and the granularity is crushed to be less than 300 mm; and the waste heat pressure hot-disintegration stage is mainly used for stabilizing the steel slag after rolling and crushing, the hot-disintegration time is 3 hours under the working pressure of 0.3-0.7 Mpa, in the process, organic matters in concentrated brine are directly decomposed and gasified under the high-temperature environment, free calcium oxide (f-CaO) and 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) of the processed steel slag is less than 3%, and the water immersion expansion rate is less than 1.5%. In order to ensure that the hot and stuffy steel slag powder meets the product standard GB/T20491-2017 steel slag powder for cement and concrete, the Cl in the suction well is periodically detected-Concentration, control of Cl-The concentration does not exceed 3000 mg/L, and if the Cl-concentration in the suction well is about to exceed 3000 mg/L, industrial fresh water should be supplemented.
In order to avoid secondary pollution caused by dust and steam in the hot disintegrating process of the steel slag, the system is provided with a movable steel slag hot disintegrating dust removal device, a movable cover vehicle is connected with a telescopic pipeline, a flue gas pipeline enters a wet electric dust removal system and then is discharged from a chimney under the action of a fan, the device is remotely controlled by P L C, the occupied area is small, the automation degree is high, the manual production operation environment in the hot disintegrating process of the steel slag is improved, and the concentration of dust discharged by dedusting flue gas is lower than 30mg/m3。
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages: (1) the refractory organics in the concentrated brine are gasified and decomposed in the hot disintegration process of the steel slag, and the hardness of the carbonate in the concentrated brine is removed in a sedimentation tank. (2) The steel slag meets the product standard of GB/T20491-2017 steel slag powder used in cement and concrete by controlling the content of chloride ions in the circulating water. (3) By adding the scale inhibition dispersing agent, the corrosion problem of the steel slag hot disintegration process equipment is guaranteed, and (4) the dust hood is additionally arranged on the steel slag hot disintegration system, and dust and gas discharged in the process are collected and treated by the wet electric dust collector, so that secondary pollution in the hot disintegration process is avoided. (5) The strong brine is reused in the steel slag hot-disintegration 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 hot-disintegrating treatment process for recycling strong brine for steel slag in iron and steel enterprises.
Wherein: 1-strong brine of iron and steel enterprises, 2-hot stuffy backwater well, 3-hot stuffy sedimentation tank, 4-sludge treatment system, 5-flocculating agent feeding system, 6-steel slag hot stuffy suction well, 7-scale inhibitor dispersing and feeding system, 8-steel slag hot stuffy treatment system, 9-dust and gas collecting system, and 10-stabilized steel slag.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to the attached figure 1, the strong brine recycling process for slag disintegration treatment of steel slag comprises the following steps:
(1) and directly conveying the strong brine 1 to a steel slag hot-disintegration backwater well 2 in the iron and steel enterprise.
(2) The hot stuffy backwater alkali liquor and the strong brine are mixed to generate a chemical reaction to generate calcium carbonate, and the calcium carbonate is conveyed to the hot stuffy sedimentation tank 3 through a slag slurry pump to remove suspended matters and then automatically flows into the steel slag hot stuffy water absorption well 6 to be further recycled.
(3) And (3) sending the sludge generated in the hot disintegrating sedimentation tank 3 in the step (2) into a secondary steel slag treatment production line after passing through a sludge treatment system 4. And a scale inhibition and dispersion agent is added into the steel slag hot-closed water absorption well 6 through a scale inhibition and dispersion agent adding system 7, so that the hot-closed water system is prevented from scaling.
(4) And (3) conveying the circulating water of the steel slag hot-closed water absorption well 6 in the step (2) to a steel slag hot-closed treatment system 8, further carrying out magnetic separation and post-treatment on the obtained stabilized steel slag 10, collecting the generated dust and steam through a gas collecting hood, feeding the collected dust and steam into a dust and gas collecting system 9, and feeding the stabilized steel slag 10 into a steel slag secondary treatment system for magnetic separation and screening.
As shown in figure 1, the strong brine is reused in the hot disintegrating treatment device for the steel slag, and the strong brine is reused in the hot disintegrating treatment device for the steel slag and comprises the following components: the system comprises a hot stuffy backwater well 2, a hot stuffy sedimentation tank 3, a sludge treatment system 4, a flocculating agent feeding system 5, a steel slag hot stuffy water absorption well 6, a scale inhibitor dispersing and feeding system 7, a steel slag hot stuffy treatment system 8 and a dust and gas collection system 9; the inlet end of the hot stuffy backwater well 2 is connected with a strong brine pipeline and is used for receiving strong brine of the iron and steel enterprise; the outlet end of the hot stuffy return water well 2 is connected with the inlet end of the hot stuffy sedimentation tank 3 and is used for conveying water in the hot stuffy return water well 2 into the hot stuffy sedimentation tank 3 for treatment, and the flocculating agent adding system 5 is operably connected with the hot stuffy sedimentation tank 3 and is used for adding flocculating agent into the hot stuffy sedimentation tank 3; the outlet end of the hot stuffy sedimentation tank 3 is connected with the inlet end of the steel slag hot stuffy water absorption well 6 and is used for sending the water treated by the hot stuffy sedimentation tank 3 into the steel slag hot stuffy water absorption well 6 for treatment; the hot stuffy settling tank 3 is connected with a sludge treatment system 4 and is used for conveying the sludge in the hot stuffy settling tank 3 into the sludge treatment system 4; the scale inhibition and dispersion agent adding system 7 is operatively connected with the steel slag hot-closed water absorption well 6 and is used for adding the scale inhibition and dispersion agent into the steel slag hot-closed water absorption well 6; the outlet end of the steel slag hot stuffy water absorption well 6 is connected with a steel slag hot stuffy processing system 8 and is used for conveying circulating water in the steel slag hot stuffy water absorption well 6 to the steel slag hot stuffy processing system 8; the hot stuffy return water well 2 is used for receiving hot stuffy return water generated by the hot stuffy return water well 2; the steel slag hot stuffy processing system 8 is connected with a dust and gas collecting system 9 and is used for collecting dust and steam generated in the steel slag hot stuffy processing system 8. The steel slag hot disintegration processing system 8 is connected with the steel slag secondary processing system and used for sending the stabilized steel slag 10 obtained by the steel slag hot disintegration processing system 8 into the steel slag secondary processing system for magnetic separation and screening. Wherein, the exit end of hot smoldering return water well 2 passes through the entry end of sediment stuff pump connection hot smoldering sedimentation tank 3 for promote the water that gets into the quick sediment of hot smoldering sedimentation tank through the sediment stuff pump with the water in the hot smoldering return water well 2.
The strong brine 1 of the iron and steel enterprise comprises the concentrated water of water produced by softening or reverse osmosis of raw water, the concentrated water of water produced by reverse osmosis after comprehensive sewage treatment, concentrated solution of strong brine produced by membrane method and electrodialysis, and high-salinity waste liquid produced in the desulfurization process of the iron and steel enterprise, wherein the pH value of the strong brine is 6-9, and the total dissolved solid TDS is less than or equal to 5000 mg/Lcr150 mg/L or less, 50 mg/L or less, 2000 mg/L or less sulfate, 2000 mg/L or less chloride ion, and 2000 mg/L or less total hard (total hardness) (using CaCO)3Meter).
The steel slag hot stuffy water return well 2 comprises a roll nip production water return well and a steel slag hot stuffy water return well, a strong brine 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 absorption well 6, the start and stop of a slag slurry pump in the hot stuffy water return well are linked with the liquid level of the water return well 2, the return water of the water return 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 disintegrating sedimentation tank 3 can be a horizontal flow sedimentation tank, a horizontal flow sedimentation tank and an inclined plate sedimentation tank according to actual conditions, preferably is a horizontal flow sedimentation tank, a flocculant adding device is arranged at a water inlet of the horizontal flow sedimentation tank, the flocculant adding concentration is PAC (Poly aluminum Chloride) of 30-100 mg/L, preferably 50 mg/L (Polyacrylamide) of 2-10 mg/L, preferably 5 mg/L, mixed alkali liquor conveyed from a hot disintegrating return well is subjected to flocculation reaction and then rapidly sedimentated in the hot disintegrating sedimentation tank, the sedimentation tank is provided with a central transmission mud scraper, a sludge pump conveys sludge from a sedimentation tank mud bucket to a sludge dewatering room for sludge dewatering, the sludge dewatering equipment can be a plate-and-frame filter press or a belt filter press, the water content of the dewatered sludge is 50-70%, and the dewatered sludge is conveyed to a secondary steel slag treatment production line.
The scale inhibition and dispersion synergist is prepared from an organic polyamine condensate compounded mixed surfactant, and is added at a concentration of 20-100 mg/L, preferably 50 mg/L. the composite corrosion and scale inhibitor comprises 1-35% of a 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 an acrylic copolymer and 20-80% of water, and is added at a concentration of 10-50 mg/L, preferably 25 mg/L based on the total weight.
The steel slag hot stuffy treatment system 8 comprises a tank type hot stuffy treatment system and a tank type pressure hot stuffy treatment system, and the tank type pressure hot stuffy treatment system is preferably selected. The pot-type pressure hot stuffiness treatment system comprises two stages of steel slag rolling crushing and waste heat pressure hot stuffiness. The rolling and crushing stage is mainly used for rapidly cooling and crushing the molten steel slag, the processing time of the stage is 30min, the molten steel slag can be cooled from about 1600 ℃ to about 500 ℃ through the processing of the stage, and the granularity is crushed to be less than 300 mm; and the waste heat pressure hot disintegration stage is mainly used for stabilizing the steel slag after rolling and crushing, the hot disintegration time is 2-4h under the working pressure of 0.3-0.7 Mpa, in the process, organic matters in concentrated brine are directly decomposed and gasified under the high-temperature environment, free calcium oxide (f-CaO) and 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) of the processed steel slag is less than 3%, and the water immersion expansion rate is less than 1.5%. In order to ensure that the hot and stuffy steel slag powder meets the product standard GB/T20491-2017 steel slag powder for cement and concrete, the Cl in the suction well is periodically detected-Concentration, control of Cl-Concentration not exceeding 3000 mg/L if Cl is in the suction well-The concentration of the water is about to exceed 3000 mg/L, and industrial fresh water should be supplemented.
Above-mentioned slag hot stuffy in-process can produce dust and steam, in order to avoid producing secondary pollution, the system sets up portable slag hot stuffy dust collector, removes the cover car and the flexible pipeline evenAnd under the action of a fan, the flue gas pipeline enters the wet electric dust removal system and then is discharged from a chimney, the device is remotely controlled by P L C, the occupied area is small, the automation degree is high, the manual production operation environment in the hot disintegration process of the steel slag is improved, and the concentration of dust discharged by the dedusting flue gas is lower than 30mg/m3。
This is further illustrated by the following specific examples.
Example 1:
selecting raw water of a certain iron and steel enterprise in Hebei river, performing reverse osmosis treatment on the raw water to obtain concentrated water, and detecting that the pH of the concentrated water is 8.41 and the Total Dissolved Solids (TDS) is 1430 mg/Lcr61 mg/L, 0.9 mg/L ammonia nitrogen, 510 mg/L sulfate, 328 mg/L chloride ion and 1083 mg/L total hardness (as CaCO)3Meter).
Taking the concentrated water with a flow rate of 20m3And h, conveying the steel slag to a steel slag hot closed water return well, reducing the water temperature of the steel slag hot closed water return well from 90 ℃ to 75 ℃, wherein suspended matters (SS) in the water return well are 458 mg/L, and the pH value is 11.56.
The PAC adding concentration of the hot stuffy sedimentation tank is 30 mg/L, the adding concentration is 5 mg/L, the effluent SS of the sedimentation tank is 42 mg/L, the scale inhibition dispersion synergist adding concentration of the hot stuffy absorption well is 30 mg/L, the scale inhibition dispersion synergist adding concentration is 15 mg/L, and pipelines and spray heads are not scaled after operation for several days.
The detection shows that the pH of the water absorption well is 11.30, and the total dissolved solid TDS is 3340 mg/Lcr35 mg/L, 0.3 mg/L of ammonia nitrogen, 1535 mg/L of sulfate, 1036 mg/L of chloride ions and 473 mg/L of total hardness (as CaCO)3Meter).
By detecting Cl in the steel slag-The content of the Cl in the steel slag is 0.029 percent and is lower than that of Cl in the steel slag required in the product standard GB/T20491-2017 steel slag powder for cement and concrete-The content is not more than 0.06 percent, and the dust concentration discharged by the dedusting smoke is 18mg/m3。
Example 2:
selecting reverse osmosis concentrated water after comprehensive sewage treatment of a certain iron and steel enterprise in Hebei, and detecting that the pH of the concentrated water is 7.75 and the Total Dissolved Solids (TDS) is 3150 mg/Lcr119 mg/L, 25 mg/L ammonia nitrogen, 1260 mg/L sulfate, 1021 mg/L chloride ion and 1573 mg/L total hardness (as CaCO)3Meter).
Taking the concentrated water with a flow rate of 20m3And h, conveying the steel slag to a steel slag hot closed water return well, reducing the water temperature of the steel slag hot closed water return well from 90 ℃ to 75 ℃, wherein suspended matters (SS) in the water return well are 573 mg/L, and the pH value is 11.35.
The PAC adding concentration of the hot stuffy sedimentation tank is 50 mg/L, the adding concentration is 5 mg/L, the effluent SS of the sedimentation tank is 35 mg/L, the scale inhibition dispersion synergist adding concentration of the hot stuffy absorption well is 50 mg/L, the scale inhibition dispersion synergist adding concentration is 15 mg/L, and pipelines and spray heads are not scaled after operation for several days.
Through detection, the pH of the water absorption well is 11.12, and the total dissolved solid TDS is 5936 mg/Lcr56 mg/L, 4.5 mg/L ammonia nitrogen, 2475 mg/L sulfate, 2133 mg/L chloride ions and 526 mg/L total hardness (as CaCO)3Meter).
By detecting Cl in the steel slag-The content of the Cl in the steel slag is 0.046 percent and is lower than that of Cl in the steel slag required in the product standard GB/T20491-2017 steel slag powder for cement and concrete-The content is not more than 0.06 percent, and the dust concentration discharged by the dedusting smoke is 19mg/m3。
Claims (10)
1. A hot stuffiness treatment method for reusing strong brine in steel slag comprises the following steps:
step (1): the strong brine of the iron and steel enterprise is directly conveyed to the steel slag hot-closed water return well (2);
step (2): hot stuffy backwater alkali liquor received from a steel slag hot stuffy treatment system (8) in a steel slag hot stuffy backwater well (2) is mixed with strong brine of an iron and steel enterprise to generate a chemical reaction to generate calcium carbonate, the calcium carbonate is sent to a hot stuffy sedimentation tank (3), preferably sent to the hot stuffy sedimentation tank (3) through a slurry pump, and after a flocculating agent is added into the hot stuffy sedimentation tank (3) through a flocculating agent adding system (5) to remove suspended matters, water in the hot stuffy sedimentation tank (3) automatically flows into a steel slag hot stuffy water absorption well (6) to be further recycled;
and (3): sludge generated in the hot stuffy sedimentation tank (3) in the step (2) is treated by a sludge treatment system (4), and preferably is dewatered by the sludge treatment system (4) and then is sent to a secondary steel slag treatment production line; adding a scale inhibition dispersing agent into the steel slag hot closed water absorption well (6) through a scale inhibition agent dispersing and adding system (7), so as to ensure that the steel slag hot closed treatment system (8) is not scaled, and preferably ensure that a hot closed water system of the steel slag hot closed treatment system (8) is not scaled;
and (4): circulating water obtained by adding a scale inhibition dispersant into the steel slag hot-closed water absorption well (6) and then treating the mixture is delivered 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 return water alkali liquor generated by the steel slag hot-closed treatment system (8) is delivered to a steel slag hot-closed return water 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 treated by a wet electric dust collector.
2. The method according to claim 1, wherein the concentrated brine of the iron and steel enterprise comprises the concentrated brine of the softened or reverse osmosis raw water and the concentrated brine of the reverse osmosis comprehensive sewage, and preferably does not comprise the concentrated brine of the concentrated brine which is further subjected to membrane process and electrodialysis to produce water and the high-salinity waste liquid generated in the desulfurization process.
3. The method according to any one of claims 1 to 2, wherein the concentrated brine of the iron and steel works has a pH of 6 to 9 and a total dissolved solids TDS of 5000 mg/L or lesscr150 mg/L or less, 50 mg/L or less, 2000 mg/L or less sulfate, 2000 mg/L or less chloride ion and 2000 mg/L or less total hardness (CaCO3Meter).
4. The method as claimed in any one of claims 1 to 3, wherein the slag hot closed suction well (6) is periodically tested for Cl-concentration, and the Cl-concentration is controlled not to exceed 3000 mg/L, and if the Cl-concentration in the suction well is about to exceed 3000 mg/L, new industrial water should be added.
5. The method according to one of claims 1 to 4, characterized in that a slurry pump and a liquid level meter are arranged in the steel slag hot stuffy water return well (2), and the start and stop of the slurry pump in the steel slag hot stuffy water return well (2) are controlled in linkage with the liquid level of the water return well.
6. The method according to any one of claims 1 to 5, wherein the backwater pH 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.
7. The method according to any one of claims 1 to 6, wherein a flocculant adding system (5) is arranged at a water inlet of the hot closed sedimentation tank (3), preferably, the flocculant adding system (5) is arranged at a water inlet of an inlet end of the hot closed sedimentation tank (3), and the PAC (poly aluminum chloride) adding concentration is 30-100 mg/L and is 2-10 mg/L.
8. The method according to any one of claims 1 to 7, wherein a central transmission mud scraper is arranged in the hot closed sedimentation tank (3) and used for scraping the sludge in the hot closed sedimentation tank (3) into a mud bucket of the sedimentation tank, a sludge pump conveys the sludge from the mud bucket of the sedimentation tank to a sludge dewatering room of a sludge treatment system (4) for sludge dewatering, the dewatered sludge is conveyed to a secondary steel slag treatment production line, preferably, a scale inhibition dispersing and adding system (7) comprises a scale inhibition dispersing synergist and a composite corrosion and scale inhibitor, preferably, the scale inhibition dispersing synergist is prepared by an organic polyamine condensate compounded mixed surfactant, the adding concentration is 20-100 mg/L, preferably, the composite corrosion and scale inhibitor in the scale inhibition dispersing and adding system (7) is based on the total weight and comprises 1-35% of a scale inhibitor (polyaspartic acid, one or two of polyepoxysuccinic acid) and 1-25% of a carboxylic acid or a sulfonic acid copolymer and 20-80% of water, preferably, the adding concentration is 10-50 mg/L, the working pressure of the scale inhibitor of the steel slag treatment system is preferably, the slag treatment system is less than 0.5-0.5 MPa, the working pressure of a movable steel slag soaking and a dust collecting system is less than 1.5, the working pressure of a wet dust collecting system, the wet dust collecting system is preferably, the wet dust collecting system is less than 1-3.5-3-0.5 hours after the wet-0.3-0.5-0.3-0.4 wet-time of a wet-type slag dustThe gas treatment system adopts P L C remote control, and the dust concentration of the dust discharged by the dedusting smoke is lower than 30mg/m3。
9. The utility model provides a strong brine is returned and is used in slag hot disintegration processing apparatus which characterized in that, strong brine is returned and is used in slag hot disintegration processing apparatus includes: the system comprises a hot stuffy backwater well (2), a hot stuffy sedimentation tank (3), a sludge treatment system (4), a flocculating agent feeding system (5), a steel slag hot stuffy water absorption well (6), a scale inhibitor dispersing and feeding system (7), a steel slag hot stuffy treatment system (8) and a dust and gas collection system (9); the inlet end of the hot stuffy water return well (2) is connected with a strong brine pipeline and is used for receiving strong brine of a steel enterprise; the outlet end of the hot stuffy water return well (2) is connected with the inlet end of the hot stuffy sedimentation tank (3) and is used for conveying water in the hot stuffy water return well (2) into the hot stuffy sedimentation tank (3) for treatment, and the flocculating agent adding system (5) is operably connected with the hot stuffy sedimentation tank (3) and is used for adding flocculating agent into the hot stuffy sedimentation tank (3); the outlet end of the hot stuffy sedimentation tank (3) is connected with the inlet end of the steel slag hot stuffy water absorption well (6) and is used for sending the water treated by the hot stuffy sedimentation tank (3) into the steel slag hot stuffy water absorption well (6) for treatment; the hot stuffy deposition tank (3) is connected with the sludge treatment system (4) and is used for conveying the sludge in the hot stuffy deposition tank (3) into the sludge treatment system (4); the scale inhibition and dispersion agent adding system (7) is operatively connected with the steel slag hot closed suction well (6) and is used for adding the scale inhibition and dispersion agent into the steel slag hot closed suction well (6); the outlet end of the steel slag hot stuffy water absorption well (6) is connected with the steel slag hot stuffy processing system (8) and is used for conveying the circulating water in the steel slag hot stuffy water absorption well (6) to the steel slag hot stuffy processing system (8); the hot stuffy backwater well (2) is used for receiving the hot stuffy backwater generated by the hot stuffy slag treatment system (8) by the hot stuffy backwater well (2); the steel slag hot stuffy processing system (8) is connected with the dust and gas collecting system (9) and is used for collecting the dust and steam generated in the steel slag hot stuffy processing system (8).
10. The concentrated brine is recycled to the steel slag hot stuffiness treatment device according to claim 9, wherein the steel slag hot stuffiness treatment system (8) is connected with the steel slag secondary treatment system, and is used for sending stabilized steel slag (10) obtained by the steel slag hot stuffiness treatment system (8) to the steel slag secondary treatment system for magnetic separation and screening. Preferably, the outlet end of the hot stuffy return water well (2) is connected with the inlet end of the hot stuffy sedimentation tank (3) through a slurry pump, and the outlet end is used for lifting the water in the hot stuffy return water well (2) into the hot stuffy sedimentation tank through the slurry pump for rapid sedimentation. Preferably, the strong brine pipeline is provided with an automatic control valve and a metering device. Preferably, the hot stuffy sedimentation tank (3) is an advection type sedimentation tank, a width-flow type sedimentation tank or an inclined plate sedimentation tank. Preferably, the supernatant effluent of the hot-closed sedimentation tank (3) automatically flows into the hot-closed water absorption well (6) through a pipeline. Preferably, the hot disintegrating treatment system (8) of the steel slag comprises a tank type hot disintegrating treatment system and a tank type pressure hot disintegrating treatment system.
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| 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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| 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 |
| CN113023990A (en) * | 2021-03-16 | 2021-06-25 | 中冶节能环保有限责任公司 | Method for treating high-salinity water in steel plant |
| CN113023990B (en) * | 2021-03-16 | 2023-01-10 | 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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