Method for treatment of waste nitric acid from etching zinc plate
The processing method includes: standing still waste nitric acid produced from etching zinc plate to separate organic solvent and water phase solution, adding barium carbonate or barium hydroxide, and adjusting to pH 5-6, thus producing precipatated barium nitrate and zinc nitrate, after evaporation...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The processing method includes: standing still waste nitric acid produced from etching zinc plate to separate organic solvent and water phase solution, adding barium carbonate or barium hydroxide, and adjusting to pH 5-6, thus producing precipatated barium nitrate and zinc nitrate, after evaporation, concentration, centrifugal separation to remove water, and drying by infrared dryer, thus obtaining a mixture of zinc nitrate and barium nitrate, which are oxidizers and generate oxygen when heating, so that they can be used as a combustion supporting agent. |
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