A kind of processing method of phosphoric acid waste liquid

A treatment method, phosphoric acid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high energy consumption, large equipment volume, and large investment in the concentration process. To achieve the effect of protecting the natural ecological environment and saving resources

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These concentration processes have high energy consumption, large equipment volume, large investment, and are prone to entrainment and other phenomena.

Method used

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  • A kind of processing method of phosphoric acid waste liquid

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Experimental program
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Effect test

Embodiment 1

[0069] For a schematic diagram of the process, see figure 1 . The water quality characteristic of phosphoric acid waste liquid in embodiment 1 is: PO 4 3- 323813mg / l, Na + 1241mg / l, K + 576mg / l, Mg 2+ 17005mg / l, Ca 2+ 1427mg / l.

[0070] The operation steps are as follows:

[0071] (1) Microfiltration. Entering the phosphoric acid waste liquid into a microfiltration unit for treatment to remove calcium phosphate, magnesium phosphate and other suspended matter in the phosphoric acid waste liquid;

[0072] (2) Anion exchange. Put the phosphoric acid waste liquid treated in step (1) into the anion exchange resin for ion exchange, so that the phosphate ions in the waste liquid are adsorbed on the anion exchange resin. The salt-containing waste liquid is discharged from the anion exchange resin, and then discharged directly or combined with other process wastewater for treatment.

[0073] After the anion exchange resin has been used for 5 days, use 1 mol / L sodium hydroxid...

Embodiment 2

[0083] For a schematic diagram of the process, see figure 1 . The water quality characteristics of phosphoric acid waste liquid in embodiment 2 are the same as embodiment 1.

[0084] The operating steps are the same as in Example 1. Wherein different from Example 1, after the anion exchange resin was used for 6 days, a 1.5mol / L sodium hydroxide solution was used for regeneration treatment; after the cation exchange resin was used for 6 days, a 3.5mol / L hydrochloric acid solution was used for regeneration treatment;

[0085] In the above steps, the microfiltration used is Gore microfiltration, and the Gore microfiltration membrane material is a PTFE membrane material with a membrane pore size of 0.2 μm; the anion exchange resin used is a polystyrene series strong basic anion exchange resin; the cation exchange resin used is Polystyrene-based strong acid cation exchange resin; the membrane distillation module used is polytetrafluoroethylene (PTFE) hollow fiber hydrophobic memb...

Embodiment 3

[0091] For a schematic diagram of the process, see figure 1 . The water quality characteristics of phosphoric acid waste liquid in embodiment 3 are the same as embodiment 1.

[0092] The operating steps are the same as in Example 1. Wherein different from Example 1, after the anion exchange resin was used for 6 days, a 1.5mol / L sodium hydroxide solution was used for regeneration treatment; after the cation exchange resin was used for 6 days, a 3.5mol / L hydrochloric acid solution was used for regeneration treatment;

[0093] In the above steps, the microfiltration used is Gore microfiltration, and the Gore microfiltration membrane material is a PTFE membrane material with a membrane pore size of 0.2 μm; the anion exchange resin used is a polystyrene series strong basic anion exchange resin; the cation exchange resin used is Polystyrene-based strong acid cation exchange resin; the membrane distillation module used is a polytetrafluoroethylene (PTFE) hollow fiber hydrophobic me...

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Abstract

The invention relates to the field of industrial waste water treatment, in particular to a method for treating phosphoric acid waste liquid. The phosphoric acid waste liquid is sequentially treated by microfiltration, anion exchange, cation exchange and membrane distillation to recover phosphoric acid therein. The microfiltration unit removes calcium phosphate, magnesium phosphate and other suspended matter in the phosphoric acid waste liquid. The anion exchange resin adsorbs phosphate ions, and the phosphoric acid on the resin is eluted during the regeneration process. The cation exchange resin removes the salt ions in the eluent, and finally obtains a concentrated pure phosphoric acid solution. After concentrated dehydration by membrane distillation, a pure phosphoric acid solution with higher concentration is obtained. The treatment method of phosphoric acid waste liquid according to the present invention adopts the technological process of microfiltration+anion exchange+cation exchange+membrane distillation, which can be used to treat phosphoric acid waste liquid produced in the production process of various industries, recycle phosphoric acid therein, and save resources while protecting the natural ecological environment.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment method for phosphoric acid waste liquid. In particular, it refers to the method of using membrane technology coupled with other technologies to treat phosphoric acid waste liquid. Background technique [0002] Phosphoric acid is widely used in iron and steel, metallurgy, petrochemical and other industries. During its use, waste liquid containing a large amount of waste phosphoric acid (phosphoric acid waste liquid) will be discharged. The direct discharge of such waste liquid not only causes serious environmental pollution, but also causes extreme Big waste of resources. Phosphorus is an important indicator for evaluating water quality. When the mass concentration of phosphorus in water exceeds 0.01mg / L, it may cause eutrophication of water. [0003] The existing treatment methods of phosphoric acid waste liquid mainly include biological treatment and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234C02F9/10
Inventor 张新妙杨永强奚振宇
Owner CHINA PETROLEUM & CHEM CORP
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