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Concentrating method of low-concentration phosphoric acid waste liquid

A low-concentration, phosphoric acid technology, which is applied in chemical instruments and methods, phosphorus compounds, heating water/sewage treatment, etc., can solve the problems of high energy consumption, large equipment volume, and large investment in the concentration process, and achieve slow membrane fouling, membrane The effect of light pollution and simple method

Inactive Publication Date: 2015-10-14
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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  • Concentrating method of low-concentration phosphoric acid waste liquid
  • Concentrating method of low-concentration phosphoric acid waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] For a schematic diagram of the process, see figure 1 and figure 2 . The phosphoric acid waste liquid is dilute phosphoric acid waste liquid with a phosphoric acid mass concentration of 5%.

[0061] The operation steps are as follows:

[0062] (1) One-stage membrane distillation. First of all, after the phosphoric acid waste liquid is heated to 67°C by heating or using a polytetrafluoroethylene plate heat exchanger and the concentrated solution of the second-stage membrane distillation unit, it is pumped into the first-stage membrane distillation unit for concentration treatment, and passed through the first-stage membrane distillation unit. After the distillation circulation concentration treatment, when the mass concentration of the concentrated solution reaches 30%, the first-level concentrated solution enters step (2) to continue the second-level membrane distillation concentration treatment;

[0063] (2) Two-stage membrane distillation. The phosphoric acid was...

Embodiment 2

[0068] For a schematic diagram of the process, see figure 1 and figure 2 . The phosphoric acid waste liquid is dilute phosphoric acid waste liquid with a phosphoric acid mass concentration of 7%.

[0069] The operation steps are as follows:

[0070] (1) One-stage membrane distillation. First, the phosphoric acid waste liquid is heated or heat-exchanged to 75°C with the concentrated solution of the polytetrafluoroethylene hollow fiber heat exchanger and 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 reaches 35%, the first-stage concentrate enters step (2) to continue the second-stage membrane distillation concentration treatment;

[0071] (2) Two-stage membrane distillation. The phosphoric acid waste liquid with a temperature of about 73°C after the first-stage me...

Embodiment 3

[0076] For a schematic diagram of the process, see figure 1 and figure 2 . The phosphoric acid waste liquid is dilute phosphoric acid waste liquid with a phosphoric acid mass concentration of 10%.

[0077] The operation steps are as follows:

[0078] (1) One-stage membrane distillation. First, the phosphoric acid waste liquid is heated or heat-exchanged to 80°C with the concentrated solution of the polytetrafluoroethylene hollow fiber heat exchanger and 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 reaches 40%, the first-stage concentrate enters step (2) to continue the second-stage membrane distillation concentration treatment;

[0079] (2) Two-stage membrane distillation. The phosphoric acid waste liquid with a temperature of about 78°C after the first-stage m...

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Abstract

The invention relates to the field of industrial waste water treatment and particularly discloses a concentrating method of a low-concentration phosphoric acid waste liquid which is a relative pure dilute phosphoric acid waste liquid, herein the "relative pure" means that the phosphoric acid waste liquid does not contain or contain few other impurity ions. In the method, the low-concentration phosphoric acid waste liquid is concentrated through a two-stage membrane distillation process, wherein the liquid remained in the two-stage membrane distillation unit is a pure phosphoric acid solution which satisfies a reuse concentration and can be used in a production process. The concentrating method of the low-concentration phosphoric acid waste liquid is carried out through the two-stage membrane distillation process to the low-concentration phosphoric acid waste liquid for recycling the phosphoric acid therein, so that the method can not only save resource but also protect natural ecologic environment, and can be used for treating the relative pure dilute phosphoric acid waste liquid generated in production processes of various industries.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for concentrating low-concentration phosphoric acid waste liquid. In particular, it refers to the concentration method that uses two-stage membrane distillation technology to treat low-concentration 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 ...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F1/08C01B25/234
Inventor 张新妙赵鹏侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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