Oily sludge and zinc-containing dust treating system and method

Abstract

The invention relates to an oily sludge and zinc-containing dust treating system and method. The system is characterized in that a pyrolysis device is provided with an oily sludge inlet, a pyrolyzed oil gas outlet and a pyrolyzed carbon outlet; a cooling device is provided with a pyrolyzed oil gas inlet, a combustible gas outlet and a cooling oil water outlet; the pyrolyzed oil gas outlet is connected to the pyrolyzed oil gas inlet; a drying device is provided with an oily sludge outlet, a pyrolyzed carbon inlet and a cooled pyrolyzed carbon outlet; the oily sludge outlet is connected to the oily sludge inlet; the pyrolyzed carbon inlet is connected to the pyrolyzed carbon outlet; a pelletizing device is provided with a zinc-containing dust inlet, a cooling pyrolyzed carbon inlet and a mixed pellet outlet; a reducing device is provided with a mixed pellet inlet, a reduced pellet outlet and a zinc-containing gas outlet; a melting separating device is provided with a reduced pellet inlet, a hot metal outlet and a melting separating slag outlet; the cooled pyrolyzed carbon inlet is connected to the cooled pyrolyzed carbon outlet; the mixed pellet outlet is connected to the mixed pellet inlet; the reduced pellet outlet is connected to the reduced pellet inlet. The system is self-sufficient, environmentally friendly, and energy saving.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a system and method for treating oily sludge and zinc-containing dust. Background technique [0002] Iron and steel enterprises will produce a large amount of oily sludge in the process of billet casting, rolling and wastewater treatment, mainly from cyclone sedimentation tanks, advection sedimentation tanks, chemical degreasers, high-speed filter backwashing, etc. The composition of oily sludge is very complex, it is difficult to settle, and it is very difficult to deal with it. The oily sludge generally contains various chemical substances such as hydrocarbons, phenols, and benzene series, and contains a large amount of iron oxide, which is highly toxic and emits a foul smell. If the oily sludge is directly discharged, it will cause serious pollution to the natural environment and waste a lot of useful resources. [0003] At present, the total amount of oily ...

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Problems solved by technology

[0006] Since oily sludge contains a large amount of crude oil and iron oxide, the components of dust are also mainly iron and carbon. If it is discharged without treatment, it will also be a waste of energy.

In the prior art, there are mainly the following disadvantages in the treatment of iron-containing waste from iron and steel plants: the process is complicated, the cost is high, and the iron in the waste is mainly recovered, and the organic matter is not used as a resource, resulting in a waste of energy , and pollute the atmosphere

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