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Recovery and treatment equipment and process of waste diluted phosphoric acid containing metal salt

A technology for recycling and processing metal salts, applied in the direction of phosphoric acid, phosphorus oxyacids, etc., can solve problems such as waste of resources, pollution of the environment, and secondary pollution of sludge, and achieve saving of recycling costs, no secondary pollution, and high economic benefits Effect

Active Publication Date: 2013-04-10
SUZHOU HAOZHONG ENVIRONMENTAL PROTECTION EQUIP
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Problems solved by technology

[0002] At present, in some chemical industries, such as aluminum electrolytic capacitor aluminum foil, steel and other metal surface treatment processes, a large amount of waste dilute phosphoric acid containing metal salts will be produced. The traditional method of disposing of these waste dilute phosphoric acid is to discharge directly, which is a waste of precious resources. It also seriously pollutes the environment; some are neutralized with lime, which wastes resources and increases costs, and produces a large amount of sludge to cause secondary pollution

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  • Recovery and treatment equipment and process of waste diluted phosphoric acid containing metal salt

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Embodiment

[0025] In this embodiment, aluminum-containing waste phosphoric acid with a mass concentration of phosphoric acid of about 5% and a mass concentration of aluminum ions of 1000 ppm is used as the waste liquid to be treated, and the device of the present invention is used to recover dilute phosphoric acid from the waste liquid. see figure 1 , the specific process is as follows:

[0026] (1), the aluminum-containing waste dilute phosphoric acid solution (H 3 PO 4 : 5%; Al 3+ : 1000ppm) is sent to the pre-filtration system at a flow rate of 1000L / hr for processing. The pre-filtration system includes a backwash filter device, which is composed of backwashable filter cloth or PE sintered filter element filter and security filter arranged in series or in parallel (depending on specific needs). It is mainly to filter out solid or colloidal particles in the waste dilute phosphoric acid solution to avoid blocking other filtration equipment such as separation membranes and adsorption...

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Abstract

The invention relates to a recovery and treatment equipment and a process of waste diluted phosphoric acid containing metal salt. The equipment comprises a pre-filtering system for filtrating solid or colloidal particles from a waste diluted phosphoric acid solution, a pressure separation membrane desalination recovery system for separating phosphate and dissociative diluted phosphoric acid in the waste diluted phosphoric acid solution treated in the previous step, and a resin acid adsorption phosphoric acid recovery and desalination system for further treating an acidiferous concentrated salt solution treated by the previous step to further separate phosphate and residual dissociative diluted phosphoric acid. According to the equipment and the process of treating the waste diluted phosphoric acid containing salt with the equipment, only water is required during treatment, no chemicals are used, no secondary pollution is caused, meanwhile most of the waste phosphoric acid can be recovered, and the equipment and the process protect the environment, save the recovering cost, and have advantages of short investment return period, high economic benefit and the like.

Description

technical field [0001] The invention relates to waste liquid recovery technology, in particular to a recovery and treatment equipment and process for waste dilute phosphoric acid containing metal salts. Background technique [0002] At present, in some chemical industries, such as aluminum electrolytic capacitor aluminum foil, steel and other metal surface treatment processes, a large amount of waste dilute phosphoric acid containing metal salts will be produced. The traditional method of disposing of these waste dilute phosphoric acid is to discharge directly, which is a waste of precious resources. It also seriously pollutes the environment; some are neutralized with lime, which wastes resources and increases costs, and also produces a large amount of sludge to cause secondary pollution. Therefore, it has become an urgent need for society and enterprises to develop new technologies for recycling and reusing waste dilute phosphoric acid for energy saving and emission reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18
Inventor 夏涵莹夏浩中
Owner SUZHOU HAOZHONG ENVIRONMENTAL PROTECTION EQUIP
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