Device for recycling strong brine for steel slag hot-disintegration treatment and treatment method
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A treatment method, concentrated brine technology, applied in water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc.
Active Publication Date: 2020-08-07
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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The invention provides a process method for reusing concentrated brine for hot stuffiness of steel slag, and controls the quality in the process,
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Embodiment 1
[0054] The raw water of an iron and steel enterprise in Hebei was selected as concentrated water after reverse osmosis treatment. After testing, the pH of the concentrated water was 8.41, the total dissolved solids (TDS) was 1430mg / L, and the COD cr 61mg / L, ammonia nitrogen 0.9mg / L, sulfate 510mg / L, chloride ion 328mg / L, total hardness 1083mg / L (calculated as CaCO 3 count).
[0055] Take the concentrated water flow rate as 20m 3 / h is transported to the steel slag hot stuffy backwater well, the water temperature of the steel slag hot stuffy backwater well drops from 90°C to 75°C, the suspended solids (SS) of the backwater well is 458mg / L, and the pH is 11.56.
[0056] The dosing concentration of PAC in the hot stuffy sedimentation tank is 30mg / L, the dosing concentration of PAM is 5mg / L, and the effluent SS of the sedimentation tank is 42mg / L. The concentration of antiscaling and dispersing synergist in hot stuffy suction well is 30mg / L, and the concentration of antiscaling ...
Embodiment 2
[0060] The reverse osmosis concentrated water after the comprehensive sewage treatment of an iron and steel enterprise in Hebei was selected. The pH of the concentrated water was 7.75, the total dissolved solids (TDS) was 3150mg / L, and the COD cr is 119mg / L, ammonia nitrogen is 25mg / L, sulfate is 1260mg / L, chloride ion is 1021mg / L, and total hardness is 1573mg / L (calculated as CaCO 3 count).
[0061] Take the concentrated water flow rate as 20m 3 / h is transported to the steel slag hot stuffy backwater well, the water temperature of the steel slag hot stuffy backwater well drops from 90°C to 75°C, the suspended solids (SS) of the backwater well is 573mg / L, and the pH is 11.35.
[0062] The dosing concentration of PAC in the hot stuffy sedimentation tank is 50mg / L, the dosing concentration of PAM is 5mg / L, and the effluent SS of the sedimentation tank is 35mg / L. The concentration of antiscaling and dispersing synergist in hot stuffy suction well is 50mg / L, and the concentrati...
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Abstract
The invention relates to a device for recycling strong brine for steel slag hot-disintegration treatment and a treatment method, and belongs to the technical field of environmental protection. The strong brine of an iron and steel enterprise is directly conveyed to the steel slag hot-disintegration water return well through a centrifugal pump, reacts with hot-disintegration water return alkali liquor and then is lifted by a slurry pump to enter a hot-disintegration settling pond to be quickly settled, supernate automatically flows into a steel slag hot-disintegration water suction well, and sludge in the settling pond enters a secondary steel slag treatment production line after being concentrated and dehydrated. A scale inhibition and dispersion agent is added into the hot-disintegrationwater suction well to prevent a hot-disintegration water system from scaling, and dust and steam generated in the steel slag hot-disintegration process are collected through a gas collecting hood to be treated. According to the device and the treatment method, the iron and steel enterprise can treat the strong brine with the lowest cost, and the strong brine is consumed.
Description
technical field [0001] The invention relates to a waste water treatment and reuse method, in particular to a device and method for reusing concentrated brine for hot stuffiness of steel slag. Background technique [0002] The iron and steel industry is a large water user and one of the most serious environmental polluters. With the development of the steel industry, the scale of steel enterprises has increased from 52.2 million tons of steel output in 1986 to nearly 900 million tons in 2018. The sharp increase in steel production has also exacerbated the increase in water consumption, making the already scarce water resources more tense. In order to reduce the amount of new water taken per ton of steel and improve the water reuse rate, major iron and steel enterprises have established independent wastewater treatment systems in each process, and then built a comprehensive sewage treatment plant to recycle all the sewage in the factory area for reuse. The effluent after com...
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