| 摘要 |
<p>PCT No. PCT/EP97/01115 Sec. 371 Date May 13, 1999 Sec. 102(e) Date May 13, 1999 PCT Filed Mar. 6, 1997 PCT Pub. No. WO97/33007 PCT Pub. Date Sep. 12, 1997A process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment consisting essentially of a heating cycle performed under non-oxidizing conditions above 900 DEG C. thereby at least partly transforming the sphalerite to wurtzite, and subsequently the wurtzite is quenched in such conditions as to retain at least partly the wurtzite after quenching. In a second step zinc is leached out of the converted ore or concentrate, and in a third step zinc is recovered from the leaching solution by electrolysis.</p> |
