Comprehensive utilization process for waste aluminum etching solution

A technology of aluminum etching and etching solution, which is applied in the direction of phosphorus compound, carboxylate preparation, inorganic chemistry, etc., can solve the problems that the technology cannot be used, so as to reduce energy consumption, ensure no corrosion, and reduce distillation temperature Effect

Active Publication Date: 2009-05-27
孟庆深
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the different components and contents, there is no unified model and unchanging process, so the current technology cannot use it, and all of them are treated by incineration.

Method used

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  • Comprehensive utilization process for waste aluminum etching solution
  • Comprehensive utilization process for waste aluminum etching solution

Examples

Experimental program
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Effect test

Embodiment

[0027] 1. Take the three-stage distillation method as an example: the waste aluminum etching solution is pumped into the distillation system, and enters the first-stage distiller through preheating, and the distillation temperature is 90-100 °C; the liquid passing through the first-stage distillation overflows from the liquid outlet Enter the secondary distiller, the distillation temperature is 100-110 ℃; the liquid through the secondary distillation overflows from the liquid outlet and enters the tertiary distiller, the distillation temperature is 110-125 ℃, the liquid passing through the tertiary distillation is filtered through the filter, and filtered out Mechanical impurities, add distilled water to adjust the specific gravity, and obtain industrial phosphoric acid with a concentration of 85%.

[0028] 2. The air outlets of the first to third stage evaporators are connected in series, the evaporated mixed acid gas is liquefied and returned to the storage tank, and sodium h...

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Abstract

The invention relates to a comprehensive utilization process for a waste aluminum etching solution. The process utilizes the characteristic that the boiling point and the volatility of phosphorous acid are greatly different from those of nitric acid and acetic acid to separate the phosphorous acid from the nitric acid and the acetic acid by adopting a distillation method, then filters the phosphorous acid after the distillation separation to remove mechanical impurities, and then adds distilled water to adjust the specific gravity to obtain 85 percent industrial phosphorous acid; a mixed acid of the nitric acid and the acetic acid obtained by the distillation is placed into a stainless steel reaction kettle, sodium hydroxide is added into the mixed acid to react under the stirring, then a purified reaction liquid is concentrated, crystallized, and separated to obtain a filtrate and crystals; and the crystals are dried to obtain a product, namely sodium acetate, and then the filtrate is concentrated, crystallized, separated, and dried to obtain a product, namely sodium nitrate. The process can recover and utilize a mixed acid waste liquid containing a plurality of acids, and obtain a plurality of novel chemical raw materials from the mixed acid waste liquid.

Description

technical field [0001] The invention relates to a comprehensive utilization process of waste acid solution, in particular to a comprehensive utilization process of waste aluminum etching solution. technical background [0002] Industrial waste aluminum etching solution is not a pure substance, but a mixture, which is a mixture of two or more substances. Due to the different components and contents, there is no unified model and constant process, so the current technology cannot use it, and the incineration method is used for treatment. SUMMARY OF THE INVENTION [0003] The object of the present invention is to provide a process for comprehensive utilization of waste aluminum etching solution, so as to recycle the mixed acid waste solution containing multiple acids, and obtain a variety of new chemical raw materials therefrom, such as phosphoric acid, sodium acetate Wait. [0004] The waste aluminum etching solution is a mixed acid solution composed of three acids. The bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234C01D9/08C07C53/10C07C51/41
Inventor 孟庆深
Owner 孟庆深
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