PL9739B1 - Method for dechlorination of zinc oxides and other zinc raw materials intended for electrolysis. - Google Patents
Method for dechlorination of zinc oxides and other zinc raw materials intended for electrolysis. Download PDFInfo
- Publication number
- PL9739B1 PL9739B1 PL9739A PL973927A PL9739B1 PL 9739 B1 PL9739 B1 PL 9739B1 PL 9739 A PL9739 A PL 9739A PL 973927 A PL973927 A PL 973927A PL 9739 B1 PL9739 B1 PL 9739B1
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- PL
- Poland
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- zinc
- dechlorination
- electrolysis
- raw materials
- materials intended
- Prior art date
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Description
Przewazna ilosc tlenków cynkowych zawiera chlor w takich ilosciach, ze przy wylugowaniu kwasem siarkowym roztwór zawiera kilka setek miligramów chloru, co stanowi przy nastepujacej elektrolizie ilosc, powodujaca szybkie niszczenie anod. Wy¬ mywanie chloru z tlenku cynkowego woda jest przewaznie niemozliwe z tego powo¬ du, ze tlenki cynku zawieraja zbyt wielkie ilosci siarczanu cynku, które ginelyby przy wymywaniu. Niniejszy sposób polega na dodawaniu sody, przyczem siarczan prze¬ chodzi w nierozpuszczalny weglan cynku, lub tez na dodawaniu mleka wapiennego, przyczem siarczan zamienia sie w nieroz¬ puszczalny wodorotlenek cynkowy. W ten sposób udaje sie o tyle zredukowac zawar¬ tosc chloru, ze przy wylugowywaniu kwa¬ sem siarkowym powstaje elektrolit, zawie¬ rajacy chlor w nieszkodliwych ilosciach, np. okolo 50 mg na litr.Dotychczasowy sposób odchlorowywa¬ nia polegal na tern, ze tlenek cynkowy byl wypalany przy temperaturze, przy której wielkie ilosci cynku ulatnialy sie i straty w metalu byly tak znaczne, ze sposób nie oplacal sie pod wzgledem gospodar¬ czym. PL PLMost zinc oxides contain chlorine in such quantities that, when leached with sulfuric acid, the solution contains several hundred milligrams of chlorine, which, during subsequent electrolysis, is sufficient to rapidly destroy the anodes. Leaching chlorine from zinc oxide with water is usually impossible because zinc oxides contain too much zinc sulfate, which would be lost during leaching. This method involves adding soda, which converts the sulfate into insoluble zinc carbonate, or adding milk of lime, which converts the sulfate into insoluble zinc hydroxide. This method reduces the chlorine content to such an extent that, during leaching with sulfuric acid, an electrolyte is formed containing chlorine in harmless amounts, e.g., about 50 mg per liter. The previous method of dechlorination involved burning zinc oxide at a temperature at which large amounts of zinc volatilized and the metal losses were so significant that the method was not economically viable.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL9739B1 true PL9739B1 (en) | 1929-01-31 |
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