| 摘要 |
In a process for producing sulphuric acid from roasting gas containing SO2, H2O and Hg, comprising the steps of (a) drying the gas with H2SO4 (b) subjecting the gas to a catalytic oxidation treatment so as to produce a SO3 rich gas, and (c) absorbing the SO3 in concentrated sulphuric acid, while maintaining the concentration of this acid at its initial value by addition of diluted sulphuric acid, the gas from step (b) is scrubbed with oleum, thereby producing in step (c) H2SO4 with less than 0.1 mg/l of Hg. |
