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Novel process for removing phosphorus from metal-salt-containing waste phosphoric acid

A technology of waste phosphoric acid and metal salts, applied in dicalcium phosphate fertilizer, phosphate fertilizer, water/sludge/sewage treatment, etc., can solve the problems of phosphorus failing to meet environmental protection standards, a large amount of sludge, increase treatment costs, etc., and achieve treatment results. stable effect

Inactive Publication Date: 2013-04-03
SUZHOU HAOZHONG ENVIRONMENTAL PROTECTION EQUIP
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Problems solved by technology

Some of the traditional methods of treating these waste phosphoric acids are directly discharged, which seriously pollutes the environment; some are neutralized with lime, which not only increases the treatment cost but also produces a large amount of sludge. Phosphorus discharge standards are regulated, and this method of neutralizing with lime, phosphorus discharge can no longer meet the new environmental protection standards
Another approach is to use biological treatment methods, but this also has various disadvantages

Method used

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  • Novel process for removing phosphorus from metal-salt-containing waste phosphoric acid

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Embodiment

[0017] In this embodiment, aluminum-containing waste phosphoric acid with a mass concentration of phosphoric acid of about 1% and an aluminum ion mass concentration of 4500 ppm is used as the waste liquid to be treated, and the waste liquid is dephosphorized by the process of the present invention. See figure 1 , the specific process is as follows:

[0018] (1) Lime neutralization and preliminary filtration: add lime to the aluminum-containing waste phosphoric acid solution, the reaction generates slightly water-soluble calcium phosphate precipitate, and then filter, the filter residue is a mixed precipitate of calcium phosphate and aluminum hydroxide, and the filtrate is Sewage solution of trace amounts of calcium phosphate. The filter residue can be recycled as phosphate fertilizer, and the filtrate is sent to the next step for processing.

[0019] (2), Fine Filtration: Send the filtrate obtained in step (1) into the filter device for fine filtration, mainly to remove solid...

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Abstract

The invention relates to a novel process for removing phosphorus from metal-salt-containing waste phosphoric acid, comprising the following steps of: (1) neutralizing lime to obtain calcium phosphate sediment; (2) primarily filtering to filter out solid or colloidal particles in a waste solution; and (3) carrying out adsorption and phosphorus removal on residual phosphate radicals in the waste solution by utilizing chlorine type strong-basicity anion exchange resin, wherein effluent is a phosphorus-free solution which can be directly discharged or is subjected to conventional wastewater treatment, and a phosphorus-containing salt solution desorbed from an ion exchange resin bed can be returned to the last step to be circulated. According to the novel process disclosed by the invention, a chemical ion exchange method is used to replace a biological technology which is sensitive to an environment to treat the waste phosphoric acid, so that phosphorus in the waste phosphoric acid can be effectively removed, phosphorus content in wastewater reaches a national discharging standard and the treatment effect is very stable; and the by-product calcium phosphate can also be used as a phosphate fertilizer to be recycled.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a new process for removing phosphorus from waste phosphoric acid containing metal salts. Background technique [0002] At present, some chemical industries, such as aluminum electrolytic capacitor aluminum foil, steel and other metal surface treatment processes, will produce a large amount of waste phosphoric acid. Some of the traditional methods of treating these waste phosphoric acids are directly discharged, which seriously pollutes the environment; some are neutralized with lime, which not only increases the treatment cost but also produces a large amount of sludge. Phosphorus emission standards are regulated, and this method of neutralizing with lime cannot meet the new environmental protection standards. It is also possible to use biological treatment, but this also has various disadvantages. Therefore, it is an urgent technical problem to develop a waste pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C05B3/00
Inventor 夏涵莹夏浩中
Owner SUZHOU HAOZHONG ENVIRONMENTAL PROTECTION EQUIP
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