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Method for recovering aluminum sulfate from waste acid solution

An acid solution, aluminum sulfate technology, applied in aluminum sulfate, chemical instruments and methods, alkali metal sulfites/sulfites, etc., to achieve the effects of improving economic benefits, environmentally friendly treatment, and effective treatment

Pending Publication Date: 2019-02-22
BEIJING BCEG GOLDEN SOURCES ENVIRONMENT PROTECTIONS DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is not recycled, it will also be a considerable loss of wealth for the manufacturer.

Method used

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  • Method for recovering aluminum sulfate from waste acid solution
  • Method for recovering aluminum sulfate from waste acid solution
  • Method for recovering aluminum sulfate from waste acid solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Heat a certain amount of aluminum-containing waste acid solution to 60°C, add sodium hydroxide solution in a uniform amount under stirring conditions with a rotation speed of 80rad / min, adjust the pH value of the mixed solution to 6, and make the aluminum ions in the waste acid solution Saponification reaction occurs with sodium hydroxide, the stirring time is 30min, and sodium tetrahydroxyaluminate is generated after full reaction. Continue stirring after the saponification reaction, and heat the mixed solution. When the temperature rises to 90°C, add dilute sulfuric acid with a concentration of 0.1mol / L to the solution to adjust the pH value of the mixture to 5, so that the tetrahydroxyaluminum acid The sodium is fully converted to precipitate aluminum hydroxide. After dilute sulfuric acid was added and stirring was continued for 10 min, the stirring was stopped and the mixture was allowed to stand for stratification. After standing for 20 minutes, the mixture was di...

Embodiment 2

[0058] Heat a certain amount of aluminum-containing waste acid solution to 90°C, add sodium hydroxide solution in a uniform amount under stirring conditions with a rotation speed of 120rad / min, adjust the pH value of the mixed solution to 5, and make the aluminum ions in the waste acid solution Saponification reaction occurs with sodium hydroxide, the stirring time is 60min, and sodium tetrahydroxyaluminate is generated after full reaction. Continue stirring after the saponification reaction, and heat the mixed solution. When the temperature rises to 95°C, add dilute sulfuric acid with a concentration of 0.1mol / L to the solution to fully convert sodium tetrahydroxyaluminate into aluminum hydroxide precipitation . After dilute sulfuric acid was added and stirring was continued for 15 min, the stirring was stopped and the mixture was allowed to stand for stratification. After standing for 30 minutes, the mixture was divided into the upper clarified liquid and the lower precipit...

Embodiment 3

[0060] Heat a certain amount of aluminum-containing waste acid solution to 80°C, add sodium hydroxide solution in a uniform amount under the stirring condition of 100 rad / min, adjust the pH value of the mixed solution to 5.5, and make the aluminum ions in the waste acid solution Saponification reaction occurs with sodium hydroxide, the stirring time is 40min, and sodium tetrahydroxyaluminate is generated after full reaction. Continue stirring after the saponification reaction, and heat the mixed solution. When the temperature rises to 93°C, add dilute sulfuric acid with a concentration of 0.1mol / L to the solution to fully convert sodium tetrahydroxyaluminate into aluminum hydroxide precipitation . After adding dilute sulfuric acid and continuing to stir for 20 min, stop stirring and let the mixture stand for stratification. After standing for 25 minutes, the mixture was divided into the upper clarified liquid and the lower precipitated layer, and part of the clarified liquid ...

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PUM

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Abstract

The invention provides a method for recovering aluminum sulfate from a waste acid solution. The method comprises the following steps: 1) adding sodium hydroxide into an aluminum-containing waste acidsolution, and stirring for a period of time; 2) adding sulfuric acid, regulating the pH value to 5-6, and producing a precipitate; 3) filtering the substance obtained in the step 2) to obtain the supernatant and lower precipitate, and adding the sulfuric acid into the lower precipitate to dissolve; and 4) concentrating and crystallizing the dissolving solution in the step 3), thereby obtaining theproduct. By virtue of organic combination of inorganic chemistry and physical chemistry related knowledge, the method disclosed by the invention is specifically applied to waste acid liquor of electronic material aluminum foils for treating the wastewater and recovering valuable chemical products. Therefore, technical reference is provided for other aluminum electrolysis and aluminum corrosion industries and other metal electrolysis and metal corrosion industries.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for recovering aluminum sulfate from waste acid solution. Background technique [0002] Aluminum foil corrosion and pickling waste mainly refers to the waste water generated during the corrosion and pickling of electronic aluminum foil. In order to remove the oxide film on the surface of the aluminum foil, increase the surface area of ​​the aluminum foil, and remove trace metal impurities such as copper and iron in the aluminum foil, acid is used for surface treatment, and a large amount of waste acid solution is produced every year. In fact, this kind of "waste acid liquid" contains not only free various acids, but also a considerable amount of aluminum salts. If it is discharged without treatment, it will not only corrode the sewer pipes and the foundation of the factory building, but also cause water pollution if it is discharged directly. Aluminum-containing waste ...

Claims

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Application Information

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IPC IPC(8): C01F7/74C01D5/00
CPCC01D5/00C01F7/74
Inventor 李焕军
Owner BEIJING BCEG GOLDEN SOURCES ENVIRONMENT PROTECTIONS DEV CO LTD
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