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Recovery method of phosphate discharge liquid

A phosphoric acid and waste liquid technology, applied in chemical instruments and methods, ion exchange water/sewage treatment, water/sewage treatment, etc., can solve problems such as large energy consumption and large amount of vaporized water

Inactive Publication Date: 2008-09-03
BEIJING TEX STRONG NEW MATERIAL DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the phosphoric acid waste liquid with low concentration, even if vacuum distillation is used, a large amount of vaporized water is still required, and the energy consumption is still relatively large.

Method used

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  • Recovery method of phosphate discharge liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Phosphoric acid waste liquid containing 0.5% phosphoric acid, temperature 20°C, flow rate 1.5m 3 / h. First pass through a 200-mesh stainless steel filter. Then enter the ion exchange tower A for ion exchange. The exchange tower A is filled with polystyrene-based strongly basic anion exchange resin, with a loading capacity of 1.8m 3 . The effluent enters the water treatment plant for treatment. After the exchange was carried out for 1 hour, a sodium hydroxide solution was introduced for regeneration treatment, and the regeneration solution entered the ion exchange tower B for ion exchange. Exchange column B is filled with polystyrene-based strong acidic cation exchange resin, with a loading capacity of 1.8m 3 After the exchange was carried out for 1 hour, the hydrochloric acid solution was passed through for regeneration. The ion exchange effluent enters the vacuum evaporator, the operating temperature is 30°C, and the vacuum degree is 2 kPa absolute pressure. The...

Embodiment 2

[0032] Phosphoric acid waste liquid containing 0.1% phosphoric acid, temperature 20°C, flow rate 2.5m 3 / h. First pass through a 200-mesh stainless steel filter. Then enter the ion exchange tower A for ion exchange. The exchange tower A is filled with polystyrene-based strong basic anion exchange resin, and the filling volume is 1.0m 3 . The effluent enters the water treatment plant for treatment. After the exchange was carried out for 1 hour, a sodium hydroxide solution was introduced for regeneration treatment, and the regeneration solution entered the ion exchange tower B for ion exchange. The exchange column B is filled with polystyrene series strong acidic cation exchange resin, and the filling volume is 1.0m 3 After the exchange was carried out for 1 hour, the hydrochloric acid solution was passed through for regeneration. The ion-exchange effluent enters the vacuum evaporator, the operating temperature is 110°C, and the vacuum degree is an absolute pressure of 10 ...

Embodiment 3

[0034] Phosphoric acid waste liquid containing 0.1% phosphoric acid, temperature 15°C, flow rate 2.5m 3 / h. First pass through a 100-mesh plate and frame filter. Then enter the ion exchange tower A for ion exchange. The exchange tower A is filled with polystyrene-based strong basic anion exchange resin, and the filling volume is 1.0m 3 . The effluent enters the water treatment plant for treatment. After the exchange was carried out for 1 hour, a sodium hydroxide solution was introduced for regeneration treatment, and the regeneration solution entered the ion exchange tower B for ion exchange. The exchange column B is filled with polystyrene series weakly acidic cation exchange resin, and the filling volume is 1.5m 3 After the exchange was carried out for 1 hour, the hydrochloric acid solution was passed through for regeneration. The ion exchange effluent enters the vacuum evaporator, the operating temperature is 40°C, and the vacuum degree is 5 kPa absolute pressure. Th...

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Abstract

The invention relates to a method for treating and reclaiming phosphatic waste liquor with low concentration. The method comprises the following steps: firstly solid impurity is removed through filtering the waste liquor containing phosphoric acid, then ion exchange is performed through anion exchange resin to ensure phosphate radical ion to be attached to the resin, and therefore the phosphoric acid is separated from the waste liquor. Then elution is performed to the anion exchange resin by using sodium salts, such as sodium chloride or sodium carbonate, and ammonia salt solution, to displace the phosphate radical ion, and to generate phosphatic sodium salt with higher concentration or ammonium saltwater solution. Then ion-exchange treatment is performed to the water solution by using the anion exchange resin, sodium ion or ammonia ion is replaced by hydrogen ion, and phosphatic water solution with higher concentration is generated. At last, moisture in the phosphatic water solution is removed by using vacuum evaporation, and pure phosphoric acid is obtained to be circularly used. The method is applied to other phosphatic waste liquor with little dissoluble impurity.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a treatment and recovery method of low-concentration phosphoric acid waste liquid. Background technique [0002] Phosphoric acid, including polyphosphoric acid, is a more common solvent. In the process of using phosphoric acid, waste liquid containing phosphoric acid will be generated. Especially in the production process of PBO fiber, a large amount of low-concentration phosphoric acid waste liquid will be produced. [0003] PBO fiber is also called phenylene benzobisoxazole fiber, phenylene benzobisoxazole fiber. The strength of PBO fiber products can reach 5.8GPa, the modulus is 180GPa; the heat resistance temperature reaches 600°C, the limiting oxygen index is 68, it does not burn or shrink in the flame, and its heat resistance and flame retardancy are higher than any other organic fibers. . Mainly used in heat-resistant industrial textiles and fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/58
Inventor 尹晔东
Owner BEIJING TEX STRONG NEW MATERIAL DEV
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