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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  • Summary
  • 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 pro

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

Examples

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Example Embodiment

[0036] Example 1

[0037] Such as Figure 1~2 The described sintering flue gas activated carbon desulfurization process acid wastewater resource system includes a first-level reaction tank 1, which is sequentially connected to a second-stage reaction tank 2, a third-stage reaction tank 3, and a preheater via a main line 4. The rising film heater 5, the vacuum evaporator 6, the crystallizer 7, the centrifuge 8 and the multilayer fluidized bed dryer 11, the first-stage reaction tank 1 is respectively connected with the ammonia pipe 12 and the acid wastewater pipe 1.1, the second-stage The reaction tank 2 is connected with an ammonia pipe 12, the third-stage reaction tank 3 is connected with an aeration pipe or a double ammonia pipe 13, and the first-stage reaction tank 1 is sequentially connected with a first-stage sludge dehydrator 10 and a multilayer fluidization through a first-stage branch pipe Bed dryer 11; the primary sludge dehydrator 10 communicates with the primary reacti...

Example Embodiment

[0041] Example 2

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

[0043] Acid production wastewater: pH -1, acid content 4.08%, SO 4 2- Content 6328mg / L, ammonia nitrogen content 300mg / L, suspended solids 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, Cr content is 0.1mg / L.

[0044] The method for recycling acid-making wastewater on the sintering flue gas activated carbon desulfurization process acid-making wastewater includes the following steps:

[0045] 1) Pre-treat the sulphuric acid wastewater first,

[0046] a. Pour 15% ammonia water into the first-level reaction tank 1, mix the ammonia water and the acid-making wastewater with a stirrer, check the pH of the wastewater to reach 6.5, stop stirring and add ammonia water, and let the reaction tank settle for 5 minutes. The suspended activated carbon powder in the wastewater is precipitated and enters the first-stage sludge dehydrator 10 t...

Example Embodiment

[0055] Example 3

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

[0057] Acid production wastewater: pH -0.8, acid content 4.92%, SO 4 2- Content 9328mg / L, ammonia nitrogen content 350mg / L, suspended solids 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, Cr content is 0.1mg / L.

[0058] The method for recycling acid-making wastewater on the sintering flue gas activated carbon desulfurization process acid-making wastewater includes the following steps:

[0059] 1) Pre-treat the sulphuric acid wastewater first,

[0060] a. Pour 12% ammonia water into the first-stage reaction tank 1, mix the ammonia water and the acid-making wastewater with a stirrer, check the pH value of the wastewater to reach 7, stop stirring and add ammonia water, and let the reaction tank settle for 8 minutes. The suspended activated carbon powder in the wastewater is precipitated and enters the first-stage sludge dehydrato...

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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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