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A kind of treatment recovery method of phosphoric acid waste liquid

A recovery method and waste liquid 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 slowing membrane fouling, light membrane fouling, and simple and easy method

Active Publication Date: 2018-04-10
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 treatment recovery method of phosphoric acid waste liquid
  • A kind of treatment recovery method of phosphoric acid waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] For a schematic diagram of the process, see figure 1 . The water quality characteristics of phosphoric acid waste liquid in the figure are: PO4 3- 50000~100000mg / l, Na + 200~500mg / l, K + 50~200mg / l, Mg 2+ 2000~5000mg / l, Ca 2+ 200~500mg / l;

[0099] The operation steps are as follows:

[0100] (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;

[0101] (2) Anion exchange. Put the phosphoric acid waste liquid treated in step (1) into the anion exchange resin (anion exchange column) for ion exchange, so that the phosphate ions in the waste liquid are adsorbed on the anion exchange resin, after being adsorbed by the anion exchange resin, no phosphorus or The saline waste liquid containing a very small amount of phosphorus is discharged from the anion exchange resin, and then discharged directly or comb...

Embodiment 2

[0115] 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.

[0116] The operating steps are the same as in Example 1. Wherein it is different from embodiment 1:

[0117] After the anion exchange resin has been used for 13 days, use 1.5mol / L sodium hydroxide solution for regeneration treatment;

[0118] After the cation exchange resin has been used for 13 days, use 3.5mol / L hydrochloric acid solution for regeneration treatment;

[0119] The thicker pure phosphoric acid solution is heated to 75°C by heating or using the polytetrafluoroethylene hollow fiber heat exchanger 12 and the concentrated solution of the secondary membrane distillation unit, and then pumped into the primary membrane distillation unit for concentration treatment. After the first-stage membrane distillation circulation concentration treatment, when the mass concentration of the concentrate r...

Embodiment 3

[0127] 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.

[0128] The operating steps are the same as in Example 1. Wherein it is different from embodiment 1:

[0129] After the anion exchange resin has been used for 14 days, use 1.5mol / L sodium hydroxide solution for regeneration treatment;

[0130] After the cation exchange resin has been used for 14 days, use 3.5mol / L hydrochloric acid solution for regeneration treatment;

[0131] The thicker pure phosphoric acid solution is heated to 80°C by heating or using the polytetrafluoroethylene hollow fiber heat exchanger 12 and the concentrated solution of the secondary membrane distillation unit, and then pumped into the primary membrane distillation unit for concentration treatment. After the first-stage membrane distillation circulation concentration treatment, when the mass concentration of the concentrate r...

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Abstract

The invention relates to the field of industrial waste water treatment and particularly relates to a treatment and recycle method of a phosphoric acid waste liquid. In the method, the phosphoric acid waste liquid is successively subjected to micro-filtration, anion exchange, cation exchange and two-stage membrane distillation for recycling the phosphoric acid therefrom. The treatment and recycle method of the phosphoric acid waste liquid, in which the processes comprising the micro-filtration, the anion exchange, the cation exchange, primary membrane distillation and secondary membrane distillation are employed, can be used for treating the phosphoric acid waste liquids generated in production processes of various industries to recycle the phosphoric acid therefrom. The method not only saves energy but also protects natural ecological environment.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment and recovery method for phosphoric acid waste liquid. In particular, it refers to the method of using membrane technology coupled with other technologies to process and recover 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 the water exceeds 0.01m g / L, it may cause water eutrophication. [0003] The existing treatment methods of phosphoric acid waste liquid mainly i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01B25/234
Inventor 张新妙谢梓峰万国晖
Owner CHINA PETROLEUM & CHEM CORP
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