3. Metallurgical treatments

3.1 Pretreatments

In order to be processed by the traditional reductive smelting process, intermediate-grade concentrates (30 to 50% Sn) containing sulfur and arsenic (e.g. in contents of a few percent and a few tenths of a percent respectively) must first undergo an oxidizing roasting operation to remove these elements by volatilization in the form of SO ₂ and As ₂ O ₃ . Failing this pre-treatment, there is a risk, during smelting, of losing tin by volatilization in the form of sulfide and of dissolving arsenic in tin.

This is the classic process used to treat gold-bearing arsenopyrites. Above all, arsenic oxidation must not...

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Bibliography

References

(1) - BENIUK (V.G.), VADEIKIS (C.A.), ENRAGHT-MOONY (J.N.) - Centrifugal jigging of gravity concentrate and tailing at Renison Limited - (Jiggage centrifuge de concentré gravimétrique et de rejet à Renison Limited). Minerals Engineering (GB) 7, n 5/6, mai 1994, p. 577-89, 5 tabl., 7 fig., bibl. (3 réf.) Elsevier Science Ltd....