Sb₂S₃ melts at 550° C. (Pelabon); at 540° (Wagemann); at 546° (Borgstrom).

Sb₂S₃ volatilizes, in the absence of air, between 650° and 917° (S.A. Chakhov and I.I. Slobodskai).

VOLATITILIZTION ROASTING: Volatilization Roasting is the process of volatilizing the sulfur and forming antimony crude oxide (Sb2O3)

Sb₂S₃ +9O→Sb₂O₃+3 SO₂; begins at 290°, rapid at 520° and finishes at 560° (Saito); begins at 290°, if the size of the grain is 0·1 mm. in diameter, at 343° of 0·1 to 0·2 mm., and 430° if 0·2 mm. (Friedrich); commences at 190°, proceeds energetically at 340° and terminates at 445° (S.A. Chakhov and I.I. Slobodskai).

DEAD ROASTING: This is the process of desulfurizing sulfide ore where the oxide is not volatilized but remains as the tetraoxide or pentoxide. The Sb2O4 and Sb2O5 is then reduced to metal.

Sb2O3 + Sb2O5 --> Sb2O4

ENGLISH PRECIPITATION: In this process, sulfur is removed from stibnite by using scrap iron in the fusion. This also requires soda ash to enhance slag removal

Sb₂S₃+3 Fe-->2Sb+3FeS

FUMING CRUDE OXIDE TO FINISHED OXIDE:

Sb₂O₃+O→Sb₂O₄ at above 445° (Chakhov and Slobodskai).

Sb₂O₄+O→Sb₂O₅; commences at 900° and finishes at 1030° (Chakhov and Slobodskai).

Sb₂O₅→Sb₂O₄+O at between 750° and 800° (A. Simon and E. Thaler).

Sb₂O₄→Sb₂O₃+O at 930° (A. Simon and E. Thaler).

REDUCTION OF CRUDE OXIDE TO METAL: This is done using carbon and soda ash.

Sb₂O₃+3C→Sb₂+3 CO at red heat.

Sb₂o₄+4C→Sb₂+4CO

LEACHING AND ELECTROWINNING TO FORM ANTIMONY METAL: 

Sb₂S_{3  +}   3 Na₂S  =  2 Na₃SbS₃             Leaching stibnite with sodium sulfide.
        Alternatvely, the leached antimony can be oxidized to sodium antimonate.

2 Na₃SbS₃ + 6NaOH = 2 Sb +  6 Na₂S + 3 H₂0 + 3/2 0₂  Electrowinning

Na₃SbS₃ + 3 H = Sb + 3 NaSH   Electrowinning