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Separation and purification technology 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 time-consuming and inconsistent working mode.

Active Publication Date: 2018-10-12
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 utilizes extraction technology to separate mixed acids. However, in the actual operation process, in order to achieve a higher extraction rate and improve the recovery rate of waste liquid, it takes 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 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.

[0028] The calcium phosphate solid produced above is separated by filtration, and a sulfuric acid solution with a concentration of 8mol / L is gradually added dropwise therein, thereby preparing a phosphoric acid solution and realizing the recovery of phosphoric acid waste liquid. Certainly, in other embodiments, also can not use sulfuric acid solution to do further treatment, can directly the calcium phosphate solid that obtains be reused.

[0029] S2: add cata...

Embodiment 2

[0033] S1: Add 10 mL of calcium chloride solution with a concentration of 0.2 mol / L to 150 mL of mixed waste acid solution (the concentration of nitric acid is about 6 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 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 is separated by filtration, and a sulfuric acid solution with a concentration of 8mol / L is gradually added dropwise therein, thereby preparing a phosphoric acid solution and realizing the recovery of phosphoric acid waste liquid. Certainly, in other embodiments, also can not use sulfuric acid solution to do further treatment, can directly the calcium phosphate solid that obtains be reused.

[0035] S2: add cata...

Embodiment 3

[0039] 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 3mol / L), and stir at room temperature in a magnetic stirrer 20min. 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.

[0040]The calcium phosphate solid produced above is separated by filtration, and a sulfuric acid solution with a concentration of 7mol / L is gradually added dropwise therein, thereby preparing a phosphoric acid solution and realizing the recovery of phosphoric acid waste liquid. Certainly, in other embodiments, also can not use sulfuric acid solution to do further treatment, can directly the calcium phosphate solid that obtains be reused.

[0041] S2: add catalyst ...

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PUM

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Abstract

The invention relates to the technical field of waste acid solution treatment, in particular to a separation and purification technology of a mixed waste acid solution. The invention aims to provide an effective experiment method for separation and purification of existing mixed acid. The method mainly comprises the following operation steps that 1, a calcium chloride solution is added into the mixed waste acid solution containing acetic acid, nitric acid and phosphoric acid, stirring is conducted, sediment is generated, and filtering is conducted to remove phosphate anions in the waste acid solution; 2, a catalyst is added into mixed solution obtained after filtering in the step 1, heating is conducted for heat preservation, and generated nitric acid vapor is collected; 3, the mixed liquor after heating treatment in the step 2 is cooled for crystallization, and filtering is conducted to remove acetate moieties in the waste acid solution. Through the technology process, separation of the phosphoric acid, the acetic acid and the nitric acid can be smoothly achieved.

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 Applications(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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