Blast furnace gas washing sewage treatment method
A blast furnace gas and treatment method technology, which is applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of decreased utilization rate of available chlorine, high comprehensive cost of water treatment, etc., and reduce project investment and the cost of operating agents, reducing the land use of the general map, and improving the utilization rate
Inactive Publication Date: 2016-02-24
武汉钢铁有限公司
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Problems solved by technology
In addition, the amount of hypochlorous acid produced by the hydrolysis of sodium hypochlorite is closely related to the pH value. Under strong alkaline conditions, the proportion of hypochlorous acid produced by its hydrolysis is relatively low, because part of the hypochlorous acid will dissociate into non-oxidizing chlorine. ions, reducing the utilization rate of available chlorine
Therefore, for low-concentration cyanide-containing wastewater, the use of alkaline chlorination treatment cannot give full play to its technical advantages, and the overall cost of water treatment is relatively high
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[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] like figure 1 As shown, the blast furnace gas washing sewage treatment method designed in the present invention includes a precipitation step and a decyanation step. The precipitation step is that the blast furnace gas washing sewage is successively placed in the radial flow sedimentation tank 1 and the inclined plate sedimentation tank 2 Sedimentation is carried out, and PAM flocculant is added to the inclined plate sedimentation tank 2 to flocculate the suspended matter to accelerate the sedimentation, and the settled sludge is sent to the dehydration station. The decyanation step is that the clarified supernatant in the precipitation step is buffered in the decyanation adjustment pool 3, and then transported to the decyanation pool 4, and sodium hypochlorite solution is quantitatively added to the decyanation pool 4 for oxid...
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The invention discloses a blast furnace gas washing sewage treatment method, which comprises a precipitation step and a decyanation step, wherein the precipitation step can adopt a conventional precipitation mode, and the decyanation step comprises the steps of conveying supernatant clarified in the precipitation step to a decyanation tank, quantitatively adding a sodium hypochlorite solution into the decyanation tank for oxidation decyanation, wherein the dosage of the sodium hypochlorite solution is that 20 to 60 mg of available chlorine is put into 1 L of blast furnace gas washing sewage, and the reaction time of the oxidation decyanation in the decyanation tank is 30 to 70 minutes. The decyanation step of the method adopts primary oxidation decyanation, and a pH value is not required for adjustment in the processing process, meanwhile system engineering investment and operating chemical cost are reduced.
Description
technical field [0001] The invention relates to a waste water treatment process, in particular to a treatment method for blast furnace gas washing sewage. Background technique [0002] The blast furnace gas washing water system is to clean the gas produced in the blast furnace smelting process by washing it with water, so that the gas can be recycled and utilized. During this process, a large amount of harmful substances such as cyanide and solid impurities enter the water when the water and gas are in contact, so that the indicators of cyanide and suspended solids in the industrial wastewater discharged after washing do not meet the environmental protection requirements, and need to be treated to meet the standards before they can be discharged. [0003] At present, most iron and steel enterprises recycle the blast furnace gas washing water after purification, cooling and water quality stabilization treatment. However, due to the enrichment of calcium and magnesium ions in ...
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IPC IPC(8): C02F9/04C02F1/76C02F101/18C02F103/16
CPCC02F9/00C02F1/5209C02F1/5245C02F1/56C02F1/72C02F2101/18C02F2103/16C02F2103/18C02F2209/06C02F2209/10C02F2305/00
Inventor 俞琴舒纯黄河黄光辉段建峰
Owner 武汉钢铁有限公司