Abstract: A method and an apparatus for the separation of the mineral components of a pyrite containing copper-molybdenum ore by flotation. The method comprises grinding the ore in the presence of soda ash in an open circuit to produce an aqueous ore slurry; subjecting the slurry to a collective flash flotation step (10) in the presence of soda ash and sodium sulphide to recover a first part of metal sulphides of the ore in the form of a first concentrate (C1); subjecting the tailings (T1) of the collective flash flotation step (10) to a grinding step (13) and to a collective rougher flotation step (14) to recover a second part of metal sulphides of the ore in the form of a second concentrate (C3); and subjecting the concentrate (C1) of the collective flash flotation step (10) and the concentrate (C3) of the collective rougher flotation step (14) to a selection step (12) to separate molybdenite from the other metal sulphides of the concentrate.

Abstract: The invention relates to a method for controlling a process, in which method at least part of the process raw materials are conducted into at least one measuring cell that comprises at least one working electrode and at least one reference electrode. In accordance with the invention, in the measuring cell, there is fed together with the raw material at least one component, and the changes caused by said component in the properties of the raw material are measured by a working electrode and a reference electrode provided in the measuring cell, and that the measurement results are utilized in order to define the composition of the raw material, and by means of the defined raw material composition, the process is controlled in order to eliminate a possible altering effect.