|
SPE Cont. |
S ≥ |
FE ≥ |
SI ≤ |
AS ≤ |
CU ≤ |
ZN ≤ |
PB ≤ |
H2O ≤ |
SIZE ≥ |
|
S35 |
35% |
30% |
10.0% |
0.01% |
0.01% |
0.5% |
0.15% |
3.0% |
90% |
|
S30 |
30% |
-- |
-- |
0.01% |
0.01% |
0.5% |
0.15% |
3.0% |
90% |
|
SIZE |
(3-35)mm or other size |
||||||||
|
PKG |
1000kg/bag or bulk |
||||||||
Core Functions of Pyrite ore lumps in Roasting for Precious Metal Recovery
Providing Heat Source (Autogenous Roasting Fuel)
Lumpy pyrite oxidizes and releases heat at high temperatures (600–800°C):
4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂
Self‑combustion maintains roasting temperature, significantly reducing fuel consumption and enabling autogenous roasting.
Oxidative Decomposition of Minerals to Liberate Precious Metals
Precious metals (Au, Ag, Pt) are often encapsulated in pyrite, arsenopyrite, and sulfide ores.
Roasting decomposes and oxidizes sulfides, destroying their structure and liberating precious metals from inclusions for subsequent cyanidation/leaching extraction.
Slag Formation and Sulfur Fixation to Form Stable Slag
Roasting produces Fe₂O₃ (hematite), which forms iron‑silicate slag with gangue minerals (SiO₂, CaO).
The slag encapsulates impurities, while precious metals remain highly enriched in the calcine, achieving "slag‑gold separation".
Desulfurization and Purification to Upgrade Precious Metal Grade
Sulfur is discharged as SO₂ gas (recyclable for acid production), while impurities such as arsenic, carbon, and organic matter are oxidized and removed.
The precious metal grade in the calcine is increased by several to dozens of times, reducing subsequent extraction costs.
Yunfu Pyrite Mine boasts large ore reserves and output, high grade, low impurities, stable quality and guaranteed delivery time.
