- Kim Kuk Chola & Kim Yong Mina
- DOI: 10.5281/zenodo.17471451
- GAS Journal of Engineering and Technology (GASJET)
The effects of roasting
temperature and excess-air coefficient on dearsenization rate and gold
extraction rate was investigated in two-stage roasting process of arsenic
containing gold concentrate.
The result shows that
roasting temperature and excess-air coefficient are main factors influenced on
dearsenization rate and gold extraction rate. In first stage roasting process
the roasting temperature and excess-air coefficient have significant effects on
dearsenization rate. If the first stage roasting temperature is above 550℃ and
the excess-air coefficient is higher than 0.85, the dearsenization rate is
decreased and it causes decrease of gold extraction rate. In second stage
roasting process the roasting temperature influences on specific surface area
of calcine and gold extraction rate increases with increment of specific
surface area. The second stage roasting temperature above 650℃ causes
decreasing of the specific area of calcine and gold extraction rate.
In the second stage roasting process the gold extraction rate increases with increment of excess-air coefficient. But the excess-air coefficient more than 1.1 has negligible effect on gold extraction rate.
