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Sintering flue gas activated carbon desulfurization process acid-making wastewater recycling system and method thereof

A technology for sintering flue gas and desulfurization process, which is applied in chemical instruments and methods, inorganic chemistry, ammonia compounds, etc., to achieve the effect of small footprint, no chemical use cost, and good separation effect.

Pending Publication Date: 2020-03-27
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a sintering flue gas activated carbon desulfurization process acid waste water resource system and its method, to solve the problem of suspended solids, heavy metals, sulfur and nitrogen resources in the acid waste water

Method used

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  • Sintering flue gas activated carbon desulfurization process acid-making wastewater recycling system and method thereof
  • Sintering flue gas activated carbon desulfurization process acid-making wastewater recycling system and method thereof

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Embodiment 1

[0037] Such as Figure 1~2 The acid waste water recycling system of the sintering flue gas activated carbon desulfurization process includes a primary reaction tank 1, which is connected to a secondary reaction tank 2, a tertiary reaction tank 3, and a preheater in sequence through a main line. 4. Rising film heater 5, vacuum evaporator 6, crystallizer 7, centrifuge 8 and multi-layer fluidized bed dryer 11, primary reaction tank 1 is respectively connected with ammonia water pipe 12 and acid waste water pipe 1.1, secondary The reaction tank 2 is connected with an ammonia water pipe 12, the third-stage reaction tank 3 is connected with an aeration pipe or a double-ammonia water pipe 13, and the first-stage reaction tank 1 is connected with a first-stage sludge dehydrator 10 and a multi-layer fluidization pipe in turn through a first-stage branch pipe. Bed dryer 11; primary sludge dehydrator 10 communicates with primary reaction tank 1 through primary return pipe 10.1.

[0038]...

Embodiment 2

[0042] A sintering flue gas activated carbon desulfurization plant:

[0043] Acid wastewater: pH is -1, acid content is 4.08%, SO 4 2- content 6328mg / L, ammonia nitrogen content 300mg / L, suspended matter content 6486mg / L, Fe content 130mg / L, Pb content 0.8mg / L, As content 0.5mg / L, Ni content 0.2mg / L, Hg content 0.4mg / L L, Cr content 0.1mg / L.

[0044] A method for recycling the acid-making wastewater of the sintering flue gas activated carbon desulfurization process acid-making wastewater comprises the following steps:

[0045] 1) The acid wastewater is pretreated first,

[0046] a. In the primary reaction tank 1, the concentration of 15% ammoniacal liquor is introduced, and the ammoniacal liquor and the acid waste water are mixed evenly with a stirrer, and the pH value of the waste water is detected to reach 6.5, then the stirring and ammoniacal liquor addition are stopped, and the reaction tank is allowed to settle for 5 minutes. Make the activated carbon powder in the su...

Embodiment 3

[0056] A sintering flue gas activated carbon desulfurization plant:

[0057] Acid wastewater: pH -0.8, acid content 4.92%, SO 4 2- content 9328mg / L, ammonia nitrogen content 350mg / L, suspended matter content 7486mg / L, Fe content 150mg / L, Pb content 0.9mg / L, As content 0.4mg / L, Ni content 0.3mg / L, Hg content 0.3mg / L L, Cr content 0.1mg / L.

[0058] A method for recycling the acid-making wastewater of the sintering flue gas activated carbon desulfurization process acid-making wastewater comprises the following steps:

[0059] 1) The acid wastewater is pretreated first,

[0060] a. It is 12% ammoniacal liquor to feed concentration in the primary reaction tank 1, make ammoniacal liquor and acid making waste water mix evenly with agitator, detect waste water pH value and make reach 7, stop stirring and add ammoniacal liquor, make reaction tank static settling 8min, Make the activated carbon powder in the suspended matter in the waste water settle down, enter the first-stage slud...

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Abstract

The invention discloses a sintering flue gas activated carbon desulfurization process acid-making wastewater recycling system and a method thereof. The system comprises a first-stage reaction tank, wherein the first-stage reaction tank is sequentially connected with a second-stage reaction tank, a third-stage reaction tank, a preheater, a climbing film heater, a vacuum evaporator, a crystallizer,a centrifugal machine and a multi-layer fluidized bed dryer through a main pipeline; wherein the first-stage reaction tank is respectively connected with an ammonia water pipe and an acid-making wastewater pipe, the second-stage reaction tank is connected with an ammonia water pipe, the third-stage reaction tank is connected with an aeration pipe or a double-ammonia-water pipe, and the first-stagereaction tank and the second-stage reaction tank are both connected with the multilayer fluidized bed dryer; the method comprises the following steps: firstly, pretreating acid-making wastewater, andthen recycling sulfur and nitrogen elements; and finally, drying activated carbon sludge, heavy metal sludge and ammonium sulfate crystal particles. The method is small in occupied area, small in investment and easy to implement on site.

Description

technical field [0001] The invention relates to the field of metallurgical waste gas treatment, in particular to a system and method for recycling waste water from acid production in a sintering flue gas activated carbon desulfurization process. Background technique [0002] The sintering flue gas of iron and steel plant is the second largest waste gas pollution source after the power industry. The sintering plant has a large amount of flue gas, and every ton of sinter produced is about 4000m 3 Flue gas; containing SO 2 High concentration, 70% SO in iron and steel enterprises 2 Discharged from the sintering workshop, the concentration is about 500-1000mg / m 3 . In the early days, sintering flue gas desulfurization technology was mainly wet method and semi-dry method, which could meet the emission requirements stipulated by the state. However, with the promotion of technology, these two methods gradually exposed the problems of waste water generation, serious corrosion and ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/242C01B32/36C02F101/10C02F101/20C02F101/22
CPCC01C1/242C01P2006/82C02F1/00C02F1/001C02F1/04C02F1/283C02F1/66C02F1/722C02F1/74C02F9/00C02F2101/101C02F2101/20C02F2101/203C02F2101/22C02F2209/10C02F2301/08C01B32/36
Inventor 杜健敏颜斌卢丽君魏海张垒刘海英吕军付本全陆婷
Owner 武汉钢铁有限公司
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