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A separation and purification process of mixed waste acid solution

A technology of acid solution and mixed solution, which is applied in the field of separation and purification of mixed waste acid solution, can solve the problems of inconsistent working modes, long time consumption, etc.

Active Publication Date: 2021-11-09
湖北永绍科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical solution disclosed above mainly uses extraction technology to separate mixed acids. However, in the actual operation process, if a higher extraction rate is to be achieved and the recovery rate of waste liquid is to be improved, it will take a lot of time, up to several hundred hours, which is out of step with modern fast-paced work patterns

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1: Add 10 mL of calcium chloride solution with a concentration of 0.2 mol / L to 100 mL of mixed waste acid solution (the concentration of nitric acid is about 4 mol / L) mixed with acetic acid, nitric acid and phosphoric acid, and stir at room temperature in a magnetic stirrer 15min. Phosphoric acid in the mixed solution gradually reacts with calcium chloride to produce solid calcium phosphate precipitation, while acetic acid and nitric acid do not react with calcium chloride and remain in the mixed waste acid solution.

[0028] The calcium phosphate solid produced above was separated by filtration, and a sulfuric acid solution with a concentration of 8 mol / L was gradually added dropwise therein to prepare a phosphoric acid solution and realize the recovery of phosphoric acid waste liquid. Of course, in other embodiments, the sulfuric acid solution may not be used for further treatment, and the obtained calcium phosphate solid may be directly reused.

[0029] S2: add cat...

Embodiment 2

[0033] S1: Add 10mL of calcium chloride solution with a concentration of 0.2mol / L to 150mL of mixed waste acid solution mixed with acetic acid, nitric acid and phosphoric acid (the concentration of nitric acid is about 6mol / L), and stir at room temperature in a magnetic stirrer 15min. Phosphoric acid in the mixture gradually reacts with calcium chloride to produce solid calcium phosphate precipitation, while acetic acid and nitric acid do not react with calcium chloride and remain in the mixed waste acid solution.

[0034] The calcium phosphate solid produced above was separated by filtration, and a sulfuric acid solution with a concentration of 8 mol / L was gradually added dropwise therein to prepare a phosphoric acid solution and realize the recovery of phosphoric acid waste liquid. Of course, in other embodiments, the sulfuric acid solution may not be used for further treatment, and the obtained calcium phosphate solid may be directly reused.

[0035] S2: add catalyst pyrit...

Embodiment 3

[0039] S1: Add 10 mL of calcium chloride solution with a concentration of 0.2 mol / L to 150 mL of mixed waste acid solution mixed with acetic acid, nitric acid and phosphoric acid (the concentration of nitric acid is about 3 mol / L), and stir at room temperature in a magnetic stirrer 20min. Phosphoric acid in the mixed solution gradually reacts with calcium chloride to produce solid calcium phosphate precipitation, while acetic acid and nitric acid do not react with calcium chloride and remain in the mixed waste acid solution.

[0040]The calcium phosphate solid produced above was separated by filtration, and a sulfuric acid solution with a concentration of 7 mol / L was gradually added dropwise to it to prepare a phosphoric acid solution, so as to realize the recovery of phosphoric acid waste liquid. Of course, in other embodiments, the sulfuric acid solution may not be used for further treatment, and the obtained calcium phosphate solid may be directly reused.

[0041] S2: add ...

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Abstract

The invention relates to the technical field of waste acid treatment, in particular to a separation and purification process of mixed waste acid solution, aiming to provide an effective experimental method for the separation and purification of existing mixed acids. It mainly includes the following operation steps: S1: Add calcium chloride solution to the mixed waste acid solution containing acetic acid, nitric acid and phosphoric acid, stir to generate precipitation, filter, and remove phosphate ions in the waste acid solution; S2: Filter to S1 Add catalyst to the mixed solution obtained, heat, keep warm, and collect the generated nitric acid vapor; S3: cool the mixed solution after S2 heat treatment, crystallize, filter, and remove acetate in the waste acid solution. Through this technological process, the separation of phosphoric acid, acetic acid and nitric acid can be successfully realized.

Description

technical field [0001] The invention relates to the technical field of waste acid treatment, in particular to a separation and purification process for mixed waste acid solutions. Background technique [0002] In recent years, with the rapid development of the industrial industry, various wastewaters are often produced in the manufacturing process. For example, mixed acid waste liquid mixed with acetic acid, nitric acid and phosphoric acid is produced in the liquid crystal manufacturing step or semiconductor manufacturing step. The random discharge of these waste liquids not only causes environmental pollution and water pollution, but also causes various organic acids and inorganic acids in the waste liquid wasted. In the traditional treatment of waste acid, it is generally neutralized and then discharged directly into nature. Moreover, in recent years, the call for global environmental protection has become more and more high, and the idea of ​​recycling has also entered ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/46C01B25/32C01B25/234
CPCC01B21/46C01B25/234C01B25/325Y02P20/584
Inventor 王小赫吴旭文鹏王秋帏吴小龙唐文郭忠诚王永进刘营滨靳海鹏
Owner 湖北永绍科技股份有限公司
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