Resourceful treatment method of phosphating waste liquid

A processing method and resource-recycling technology, applied in chemical instruments and methods, preparation of phosphorus compounds and zinc compounds, etc., can solve the problems of not realizing phosphorus and iron resource processing, high cost, and not considering resource utilization, etc. The effect of high product added value, high added value and less waste water discharge

Inactive Publication Date: 2020-07-10
蒋央芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above ideas only use the idea of ​​wastewater treatment to deal with these waste liquids, without considering resource utilization. The above-mentioned methods of treating waste liquids are costly and have not realized resource treatment of phosphorus, iron, etc.

Method used

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  • Resourceful treatment method of phosphating waste liquid
  • Resourceful treatment method of phosphating waste liquid
  • Resourceful treatment method of phosphating waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of resource processing method of phosphating waste liquid, it is the following steps:

[0039] 1) Add phosphoric acid to the phosphating waste liquid, adjust the pH of the solution to 0.8, heat up to 70°C, stir and react for 20 minutes, then add ferric nitrate to maintain the molar ratio of iron and phosphorus in the solution at 1.18, and then filter to obtain Add hydrogen peroxide to the filtrate, oxidize to stop reaction after the nitrite content in the solution is lower than 20ppm;

[0040] 2) put the solution after the reaction of step (1) into the reactor and carry out vacuum distillation. During the vacuum distillation, the temperature is 65° C. and the pressure is 10KPa. Stop the distillation after the pH of the solution is 2.1, then stir and react at a temperature of 60° C. for 50 minutes to obtain a slurry;

[0041] 3) Filter the slurry to obtain the first filtrate and the first filter residue, add sodium hydroxide to the first filtrate, adjust the pH o...

Embodiment 2

[0052] A kind of resource processing method of phosphating waste liquid, it is the following steps:

[0053] 1) Add phosphoric acid to the phosphating waste liquid, adjust the pH of the solution to 0.6, heat up to 80°C, stir and react for 25 minutes, then add ferric nitrate to maintain the molar ratio of iron and phosphorus in the solution to 1.18, and then filter to obtain Add hydrogen peroxide to the filtrate, oxidize to stop reaction after the nitrite content in the solution is lower than 20ppm;

[0054] 2) put the solution after the step (1) reaction into the reaction kettle and carry out vacuum distillation. During the vacuum distillation, the temperature is 60° C., and the pressure is 12KPa. The gas distilled out is absorbed by water spraying to obtain nitric acid solution, which is distilled to Stop the distillation after the pH of the solution is 2.1, then stir and react at a temperature of 60° C. for 50 minutes to obtain a slurry;

[0055] 3) Filter the slurry to obt...

Embodiment 3

[0066] A kind of resource processing method of phosphating waste liquid, it is the following steps:

[0067] 1) Add phosphoric acid to the phosphating waste liquid, adjust the pH of the solution to 0.95, heat up to 75°C, stir and react for 20 minutes, then add ferric nitrate to maintain the molar ratio of iron and phosphorus in the solution at 1.2, and then filter to obtain Add hydrogen peroxide to the filtrate, oxidize to stop reaction after the nitrite content in the solution is lower than 20ppm;

[0068] 2) put the solution after the reaction of step (1) into the reactor and carry out vacuum distillation. During the vacuum distillation, the temperature is 65° C. and the pressure is 10KPa. Stop the distillation after the pH of the solution is 2.1, then stir and react at a temperature of 60° C. for 50 minutes to obtain a slurry;

[0069] 3) Filter the slurry to obtain the first filtrate and the first filter residue, add sodium hydroxide to the first filtrate, adjust the pH o...

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Abstract

The invention discloses a resourceful treatment method of phosphating waste liquid. The method is as follows: adding phosphoric acid into the phosphating waste liquid, filtering after reaction, addinghydrogen peroxide into filtrate, and continuously reacting; putting the reacted solution into a reaction kettle for reduced pressure distillation, and stirring for reaction to obtain slurry; filtering the slurry to obtain a first filtrate and a first filter residue, adding sodium hydroxide into the first filtrate, reacting, precipitating and filtering to obtain a second filtrate and a second filter residue, adding sulfuric acid into the second filter residue, dissolving to obtain a dissolved solution, adding ammonia water into the dissolved solution to adjust the pH value of the solution, stirring, reacting, and filtering to obtain a third filtrate and a third filter residue; adding pure water into the first filter residue for slurrying and washing, and drying, sintering, smashing, screening and deironing the washed filter residue to obtain battery-grade iron phosphate; and returning the second filtrate to prepare a phosphating solution. Resource utilization of nitrate radicals, zinc,iron and the like can be achieved, meanwhile, the wastewater can be returned to be used for preparing the phosphating solution, the treatment cost is low, and the environmental protection property isgood.

Description

technical field [0001] The invention relates to a resource treatment method for phosphating waste liquid, belonging to the field of waste resource utilization. Background technique [0002] Phosphating is commonly used as a protective layer for automobile shells. Phosphating is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film. The phosphating process mainly includes alkaline cleaning to remove oil, pickling to remove rust, phosphating and passivation treatment, etc. process. Phosphating treatment is the pretreatment process of electrophoresis and painting in the production process of automobile shells. The main purpose of phosphating is to provide protection for the base metal and prevent the metal from being corroded to a certain extent; The adhesion and corrosion resistance of the film layer. [0003] Phosphating is the most important part of the entire pretreatment process. Its reaction mechanism is complex and the amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01G45/10C01G53/10C01G9/06C01B21/38C01B25/45H01M4/36H01M4/58H01M4/62
CPCC01B21/38C01B25/375C01B25/45C01G9/003C01G9/06C01G45/003C01G45/10C01G53/003C01G53/10C01P2006/80H01M4/366H01M4/5825H01M4/62Y02E60/10
Inventor 蒋央芳
Owner 蒋央芳
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