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Treatment technology of acid washing and alkaline washing waste liquid of aluminum substrate

A technology of pickling waste liquid and treatment process, which is applied in the direction of metallurgical wastewater treatment, neutralized water/sewage treatment, reduced water/sewage treatment, etc., to achieve significant social benefits, significant economic benefits, and improve the filtering effect

Active Publication Date: 2011-04-13
申明乐 +1
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Problems solved by technology

[0005] In social investigation and practice, the inventor found that the traditional treatment methods for pickling waste liquid and alkaline cleaning liquid of aluminum substrates have relatively large defects. And the treatment process of alkaline washing waste liquid can better solve the problems existing in the existing treatment methods, so that it can not only deal with secondary pollution, but also recycle useful by-products

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  • Treatment technology of acid washing and alkaline washing waste liquid of aluminum substrate
  • Treatment technology of acid washing and alkaline washing waste liquid of aluminum substrate

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Embodiment Construction

[0013] In conjunction with the accompanying drawings and embodiments, the specific process steps of the process of the present invention are further described.

[0014] The treatment process of aluminum substrate pickling and alkali cleaning waste liquid of the present invention, see figure 1 , the following process steps are adopted: pretreatment of aluminum substrate pickling waste liquid and alkaline washing waste liquid respectively - mixing - neutralization - separation - filter cake recycling, and discharge of waste water up to standard.

[0015] In the above steps, the iron removal pretreatment of the pickling waste liquid is carried out by adding reducing agents such as sulfite, sulfur dioxide, hydroxylamine hydrochloride or ascorbic acid to the pickling waste liquid. 0.5~10h, so that the harmful impurity Fe 3+ Convert to Fe 2+ , and then finely filtered to remove dust particles in the pickling waste liquid to obtain refined pickling waste liquid. Among them, degrea...

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Abstract

The invention relates to a technology of industrial waste liquid treatment, and provides a treatment technology of acid washing and alkaline washing waste liquid of aluminum substrate. The treatment technology is mainly characterized in that oil removal, iron removal and phosphorus and silica removal pretreatments are respectively carried out on acid washing waste liquid and alkaline washing waste liquid, and the acid washing waste liquid and the alkaline washing waste liquid are mixed, neutralized and separated, oily filter residue can be used as fuel, filter cakes can be recycled, and the waste water discharged reaches the standard. The treatment technology can perform smooth treatment to a large amount of acid washing and caustic washing waste liquid of aluminum substrate, can not cause additional pollution, can recycle side products, and solves the technical problem in the field at home and abroad for a long time, and a pilot-scale test shows that the design is reasonable, the technology is easy to be implemented, and the technology has great social, environmental protection and economic benefits.

Description

technical field [0001] The invention belongs to a method for treating industrial waste liquid, and relates to a process for treating aluminum substrate pickling and alkali cleaning waste liquid. Background technique [0002] The aluminum substrates of PS plates and CTP plates produced at home and abroad must be treated with degreasing, decontamination, electrolysis, post-corrosion, anodic oxidation, etc., so a large amount of pickling and alkali cleaning waste liquid is generated. The pickling waste liquid mainly contains hydrochloric acid 3-4g / L, sulfuric acid 30-40g / L, aluminum 3-10g / L, iron 1-30mg / L, pH value 1.0-1.2; alkaline washing waste liquid mainly contains hydrogen oxide Sodium and soda ash, aluminum 30~60g / L, iron 1~20mg / L, a small amount of silicon, phosphorus, and oil, pH value 12.5~13.0. With an annual output of 30 million m 2 Take the PS plate as an example, the pickling waste liquid generated every day is about 300m 3 , about 50m of alkali washing waste li...

Claims

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Application Information

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IPC IPC(8): C02F9/04C10L5/48C02F1/70C02F1/72C02F1/66C02F103/16
CPCY02E50/30
Inventor 申明乐
Owner 申明乐
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