Recovery treatment method for waste phosphoric acid

A technology of recycling and acid pretreatment, applied in chemical instruments and methods, phosphorus compounds, electrolytic components, etc., can solve the problems of poor applicability of phosphoric acid and the inability to use phosphoric acid directly, achieving low cost, realizing resource utilization, and simple operation. Effect

Inactive Publication Date: 2020-08-28
盛隆资源再生(无锡)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN 101602560A discloses a method for concentrating and recovering low-concentration industrial waste acid water, including: (1) pretreatment of waste acid water, first using aeration method to separate out the difficult-to-remove substances dissolved in the waste water, and then filtering with high-efficiency fiber (2) Osmotic distillation. The pretreated waste acid water enters the osmotic distillation membrane module for osmotic distillation dehydration. (3) The removal agent is evaporated and concentrated, and the removed agent diluted in step (2) is evaporated and concentrated, and osmotic distillation will be used after saturation or supersaturation; (4) Concentrated acid water Purification treatment, the concentrated acid water is filtered with nanofiltration membrane modules to remove impurities such as iron ions; the application of this method has restrictions on the type and concentration of acids in waste acid water, and it is mainly suitable for hydrochloric acid or sulfuric acid, and for phosphoric acid. Poor sex
[0004]

Method used

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  • Recovery treatment method for waste phosphoric acid

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Effect test

Embodiment 1

[0052] This embodiment provides a method for recycling waste phosphoric acid, the process flow chart of the method is as follows figure 1 shown, including the following steps:

[0053] (1) Phosphoric acid waste acid is first subjected to ultrafiltration pretreatment, and then nanofiltration treatment, the composition of phosphoric acid waste acid includes phosphoric acid and Al 3+ , Ca 2+ , Mg 2+ Inorganic metal ions, the mass fraction of phosphoric acid in phosphoric acid waste acid is 50wt%, the pressure of the nanofiltration treatment is 3.5MPa, and the temperature is 30°C to obtain the nanofiltration permeate and the nanofiltration retentate; the nanofiltration permeate The main composition of the liquid includes phosphoric acid, and the nanofiltration permeate is subjected to evaporation and concentration treatment until the concentration reaches 82wt%;

[0054] (2) adding sodium hydroxide to the nanofiltration retentate obtained in step (1) to remove impurities, the a...

Embodiment 2

[0058] This embodiment provides a method for recycling waste phosphoric acid, the method comprising the following steps:

[0059] (1) Phosphoric acid waste acid is first subjected to ultrafiltration pretreatment, and then nanofiltration treatment, the composition of phosphoric acid waste acid includes phosphoric acid and Al 3+ , Ca 2+ , Mg 2+ Inorganic metal ions, the mass fraction of phosphoric acid in phosphoric acid waste acid is 70wt%, the pressure of the nanofiltration treatment is 2MPa, and the temperature is 35°C to obtain the nanofiltration permeate and the nanofiltration retentate; the nanofiltration permeate The main components include phosphoric acid, and the nanofiltration permeate is subjected to evaporation and concentration treatment until the concentration reaches 85wt%;

[0060] (2) adding potassium hydroxide to the nanofiltration retentate obtained in step (1) for impurity removal, the addition of the potassium hydroxide is sufficient to adjust the pH value...

Embodiment 3

[0064] This embodiment provides a method for recycling waste phosphoric acid, the method comprising the following steps:

[0065] (1) Phosphoric acid waste acid is first subjected to ultrafiltration pretreatment, and then nanofiltration treatment, the composition of phosphoric acid waste acid includes phosphoric acid and Al 3+ , Ca 2+ , Mg 2+ Inorganic metal ions, the mass fraction of phosphoric acid in phosphoric acid waste acid is 20wt%, the pressure of the nanofiltration treatment is 5MPa, and the temperature is 25°C to obtain the nanofiltration permeate and the nanofiltration retentate; the nanofiltration permeate The main components include phosphoric acid, and the nanofiltration permeate is subjected to evaporation and concentration treatment until the concentration reaches 80wt%;

[0066] (2) adding sodium hydroxide to the nanofiltration retentate obtained in step (1) for impurity removal, the addition of the sodium hydroxide satisfies the adjustment pH value of 9, af...

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Abstract

The invention provides a recovery treatment method for waste phosphoric acid. The method comprises the following steps: pretreating waste phosphoric acid, and carrying out nanofiltration treatment toobtain a nanofiltration permeate and a nanofiltration trapped fluid; adding an alkaline substance into the nanofiltration trapped fluid to remove impurities, and carrying out solid-liquid separation to obtain a phosphate solution; and electrolyzing the phosphate solution to obtain phosphoric acid and alkali, and returning the alkali for recycling. According to the method, the waste phosphoric acidis sequentially subjected to nanofiltration, neutralization, precipitation and electrolysis operation, impurities in the waste phosphoric acid are separated, enrichment and recovery of phosphoric acid are achieved, and the recovery rate of phosphoric acid is high; the recovered phosphoric acid is high in purity and excellent in performance, and can meet the requirements of industries such as semiconductors; the method is simple to operate and relatively low in cost, and resource utilization of the waste acid solution is realized.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment, and relates to a method for recycling waste phosphoric acid. Background technique [0002] With the rapid development of economy and society, the discharge of waste liquid is increasing day by day. Among them, waste acid is a kind of highly corrosive waste liquid. If it is discharged without effective treatment, it will inevitably cause great damage to the environment; and the current scale is rapidly The expanded electronics industry, semiconductor industry and other production processes will produce a large amount of waste acid. As a medium-strong acid, phosphoric acid is widely used in chip manufacturing and other production processes. Therefore, waste phosphoric acid is an important waste acid. Research on the recycling process is essential. [0003] CN 101602560A discloses a method for concentrating and recovering low-concentration industrial waste acid water, including: (1) ...

Claims

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Application Information

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IPC IPC(8): C01B25/238C25B1/00C25B1/16
CPCC01B25/238C25B1/00C25B1/16
Inventor 陈琪
Owner 盛隆资源再生(无锡)有限公司
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