Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1978-05-25
1979-10-02
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204296, C25C 116, C25C 704
Patent
active
041697766
ABSTRACT:
A method and apparatus for recovery of elemental zinc from zinc scrap, typically skimmings, is disclosed. Zinc skimmings include chlorine as a zinc chloride contaminate. Chlorine liberation in zinc electrolytic refining techniques in an acid bath has failed heretofore because the elemental chlorine attacks the equipment as hydrochloric acid as well as producing a reversible chemical reaction. This method and apparatus capture the chlorine gas and remove it, enabling the process to continue indefinitely where elemental zinc is recovered at a cathode in a zinc sulfate bath which is separated from the anode by a permeable diaphragm. The process separates and removes chlorine and also collects the metal at the cathode, separates the sulfuric acid from the catholyte by transferring it by electrodialysis across the diaphragm into the anode compartment for re-use and also by this recycle enables the process to continue in operation indefinitely.
REFERENCES:
patent: 1303226 (1919-05-01), Allen
patent: 3103474 (1963-09-01), Juda
patent: 3679538 (1972-07-01), Druin et al.
patent: 3694281 (1972-09-01), Leduc
Ind. Eng. Chem., Prod. Res. Develop., vol. 13, No. 1, 1974, pp. 2-9.
Celgard Microporous Polypropylene Film, Technical Bulletins, issued by Celanese Corporation.
Dean David B.
Hayden, Jr. Douglas B.
Tufariello T. M.
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