| 摘要 |
<p>The invention relates to a method for gas handling in a mineral flotation circuit maintained under an essentially closed recirculating gas atmosphere. Pressurized process gas is fed as a flotation gas into one of more sealed flotation cells (1a,…,1e), which are maintained under an overpressure of 2-10 mbar, preferably 5-8 mbar. Process gas is collected from the tops of the flotation cells (1) and recirculated to a blower (7), which pressurizes the process gas and feeds it back to the flotation cells (1a,…,1e). The pressure in the suction side of the blower (7) is balanced with the help of a level controlled gas buffer tank (6). Oxygen content of the recirculating process gas is measured. In case the oxygen content exceeds a predetermined upper limit, nitrogen gas is added to the gas recirculation loop.</p> |
