2.2. Flotation tests
Flotation tests on single minerals were carried out in a Hallimond tube.
Prior to the test, the sample was cleaned with supersonic waves, and 1.0 g of the material was used in each test.
The samples were conditioned with xanthate for 5 min, and sodium humate was added to the tube. The flotation time was set to 3 min in all of the single-mineral experiments