Claims
- 1. A process for recycling asbestos-free diaphragms, which comprises
- comminuting the diaphragm material,
- washing the diaphragm material with a wash solution whereby a reusable diaphragm material is obtained, and
- producing a new diaphragm from the reusable diaphragm material.
- 2. The process of claim 1, where producing the new diaphragm from the reusable diaphragm material comprises
- suspending the reusable diaphragm material,
- applying the suspension of the reusable diaphragm material to a recipient surface,
- and either
- drying the applied suspension of the reusable diaphragm material by warming to below sintering temperature,
- or
- heating the applied suspension of the reusable diaphragm material to above sintering temperature,
- or both to give a new diaphragm.
- 3. The process of claim 1, wherein the asbestos-free diaphragm material is diaphragm material from alkali metal chloride electrolysis.
- 4. The process of claim 1, wherein the reusable diaphragm material is further comminuted.
- 5. The process of claim 1, wherein an inorganic material is added to the comminuted diaphragm material.
- 6. The process of claim 5, wherein the inorganic material is added to a slurry of the comminuted diaphragm material.
- 7. The process of claim 5, wherein the inorganic material has a distribution of particle size with a maximum smaller than 100 .mu.m.
- 8. The process of claim 5, wherein 5 to 50 parts by weight of zirconium oxide per 100 parts by weight of the dry mass of the comminuted diaphragm material are used as the inorganic material.
- 9. The process of claim 1, wherein the comminuted diaphragm material is washed with an acid-containing aqueous solution.
- 10. The process of claim 1, wherein the comminuted diaphragm material is washed with an HCl-containing wash solution having an HCl concentration in the range of 0.1-13 mol/l.
- 11. The process of claim 1, wherein the comminuted diaphragm material is washed with a solution containing sodium chloride.
- 12. The process of claim 1, further comprising adding a nonionic surfactant to the reusable diaphragm material.
- 13. The process of claim 1, wherein the reusable diaphragm material is mixed with original diaphragm material.
- 14. The process of claim 1, wherein the reusable diaphragm material is impregnated with a zirconium compound.
- 15. The process of claim 1, wherein the reusable diaphragm material is separated from the washing solution.
- 16. The process of claim 5, wherein the separated diaphragm material is dried.
Priority Claims (1)
Number |
Date |
Country |
Kind |
19500871.5 |
Jan 1995 |
DEX |
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Parent Case Info
This is a Divisional Application of application Ser. No. 08/585,350, filed on Jan. 11, 1996.
US Referenced Citations (3)
Non-Patent Literature Citations (2)
Entry |
Rompp Chemie-Lexicon, 1992, pp. 3808-3809. |
Ullmann's Enc. der Techn. Chem., vol. 17, p. 572, no date. |
Divisions (1)
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Number |
Date |
Country |
Parent |
585350 |
Jan 1996 |
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