| (19) |
 |
|
(11) |
EP 0 343 012 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
09.01.1991 Bulletin 1991/02 |
| (43) |
Date of publication A2: |
|
23.11.1989 Bulletin 1989/47 |
| (22) |
Date of filing: 19.05.1989 |
|
| (51) |
International Patent Classification (IPC)4: C22B 13/08 |
|
| (84) |
Designated Contracting States: |
|
AT BE DE ES FR GB GR IT SE |
| (30) |
Priority: |
20.05.1988 CA 567408
|
| (71) |
Applicant: TIMMINCO LIMITED |
|
Toronto
Ontario (CA) |
|
| (72) |
Inventors: |
|
- Zuliani, Douglas J.
Stittsville
Ontario KOA 3GO (CA)
- Closset, Bernard
Toronto
Ontario M4X 1A4 (CA)
|
| (74) |
Representative: Williams, John Francis et al |
|
WILLIAMS, POWELL & ASSOCIATES
34 Tavistock Street
London WC2E 7PB
London WC2E 7PB (GB) |
|
| |
|
| (54) |
Magnesium-calcium alloys for debismuthizing lead |
(57) A novel alloy for use in lead refining is disclosed which comprises magnesium and
calcium. The preferred ratio on a weight basis of magnesium to calcium is between
1.2 and 5.2. A method of adding this alloy to a lead bath is described which brings
calcium into solution with the lead and provides a high recovery ratio.