| In the roasting of sulphide minerals, the conventional roasting practices such as Herreschoff`s, Flash, Fluosolid roasting involve movement of solids during roasting, thus, considerable amount of dust production and increased conversion of SO₃ in the exhaust gas are unavoidable. This paper describes an improved method which overcome some drawbacks of the current processes. The ore fines are formed in a briquette with holes and roasting is carried out in a stationary manner. The findings from the tests using pyrrhotite are as follows: ① Proper green briquette can be obtained with ore fines of minus 140 mesh without any binder except 11.5% of water addition. ② Production of dust and sulphur trioxide in the exhaust gas can be lowered down to 0.18g/㎥ and 0.05% SO₃ content. ③ The cinder can be directly used for iron malting after dead roasting without further processing ④ The roasting is self sustaining and possibly applied to other sulphide minerals. |
|
