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Desulfuration waste water treatment process

A technology for desulfurization wastewater and treatment process, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve high product purity, ensure product purity, and less processing procedures

Active Publication Date: 2011-04-20
山东潍焦集团薛城能源有限公司
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Problems solved by technology

[0003] The technical problem to be solved in the present invention is to provide a desulfurization wastewater treatment process to improve the desulfurization efficiency in view of the deficiency of the existing coke oven gas desulfurization wastewater treatment method in the coking industry

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Embodiment Construction

[0014] Such as figure 1 As shown, a treatment process for treating desulfurization wastewater in a coking plant mainly includes: a decolorization process, a filtration process, an evaporation separation process, a crystallization separation process and a drying process. The specific process steps are: first, introduce the waste water to be desulfurized into the decolorization device, and add activated carbon to the decolorization device for adsorption decolorization treatment. The amount of activated carbon added is based on activated carbon / waste water to be desulfurized = 5-10kg / m 3 The ratio is added, and the decolorization time is 4-6 hours. After filtering through the filter device, the colored substances and solid impurities in the wastewater to be desulfurized are removed by adsorption, and the visual inspection of no impurities and transparent color shall prevail. Then, the waste water after adsorption, decolorization and filtration is concentrated under negative press...

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Abstract

The invention discloses a desulfuration waste water treatment process which comprises the following the steps of: firstly leading waste water to be desulfurated into a decoloration device, adding active carbon for absorbing decoloration, and then filtering by a filtering device; carrying out negative pressure concentration on the waste water subjected to absorbing decoloration and filtering through a double effect evaporimeter device so as to ensure that the density of the waste water is 1.25-1.30 times that of water; and finally cooling the concentrated waste water to 35-50 DEG C in a crystallization separator for crystal-liquid separation, wherein the discharged waste liquid can be recycled; and drying crystals into sulfur containing double salt in a dryer. The desulfuration waste water treatment process can effectively reduce the double salt content of desulfuration liquid in a desulfuration system, treat the desulfuration waste water of the desulfuration system and improve desulfuration efficiency; moreover, the recycled double salt products have certain economic benefit.

Description

technical field [0001] The invention relates to a treatment process for treating desulfurization wastewater, specifically in the coking process, from ammonia NH 3 It is a process of recovering sulfur-containing double salt from the wastewater produced by the air catalytic oxidation desulfurization and decyanation process as an alkali source. Background technique [0002] in NH 3 During the desulfurization process of coke oven gas as an alkali source, the sulfide (hydrogen sulfide (H 2 S) and hydrogen cyanide (HCN, etc.) are mostly removed during the desulfurization process, so that the desulfurization liquid can be recycled. However, a small amount of sulfur-containing double salt (referred to as double salt) is enriched in the desulfurization solution, which is ammonium sulfate ((NH 4 ) 2 SO 4 ), ammonium thiocyanate (NH 4 SCN) and ammonium thiosulfate ((NH 4 ) 2 S 2 o 3 ). These double salts accumulate continuously during the recycling process of the desulfuriz...

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Application Information

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IPC IPC(8): C02F9/02
Inventor 周兴华王读升夏潍平吴磊宗管廷江张建孝
Owner 山东潍焦集团薛城能源有限公司
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