A flotation arrangement for treating mineral ore particles suspended in slurry, comprising flotation cells (111, 112, 210, 300) for the separation of slurry into underflow and overflow (50a-b, 51a-b) wherein the separation is performed with the help of flotation gas, and wherein the flotation arrangement comprises a primary flotation line - comprising a rougher part with at least two rougher primary flotation cells (111a, 111b) connected in series and arranged in fluid communication, overflow (51a, 51b) from a first rougher primary flotation cell arranged to flow directly into a secondary flotation line, - comprising a scavenger part with at least two scavenger primary flotation cells (112a, 112b) connected in series and arranged in fluid communication, overflow from the scavenger primary flotation cells arranged to flow back into a rougher flotation cell (111a, 111b) of the primary flotation line, or into a regrinding step and then into a scavenger cleaner flotation line, and - in which a subsequent primary flotation cell is arranged to receive primary underflow from a previous primary flotation cell so that a subsequent rougher primary flotation cell is arranged to receive primary underflow from a previous rougher primary flotation cell, the first scavenger primary flotation cell is arranged to receive primary underflow from the last rougher primary flotation cell, and a subsequent scavenger primary flotation cell is arranged to receive primary underflow from a previous scavenger primary flotation cell, and underflow from the primary flotation cells is directed downstream along the primary flotation line; the secondary flotation line comprising at least two secondary flotation cells (210a, 210b), wherein in the secondary flotation line, a first secondary flotation cell is arranged in direct fluid communication with at least one rougher primary flotation cell, and arranged to receive primary overflow from the at least one rougher primary flotation cell for the recovery of a first concentrate, characterized in that in the secondary flotation line - a further secondary flotation cell is arranged in direct fluid communication with at least one further rougher primary flotation cell, and arranged to receive primary overflow from the at least one further rougher primary flotation cell for the recovery of a first concentrate, the at least one further rougher primary flotation cell being different from the at least one rougher primary flotation cell from which the first secondary flotation cell is arranged to receive primary overflow, - the further secondary flotation cell is arranged in fluid communication with a previous secondary flotation cell, and - underflow from the first secondary flotation cell is arranged to flow into the further secondary flotation cell, or arranged to be combined with secondary underflow of the further secondary flotation cell. - comprising a rougher part with at least two rougher primary flotation cells (111a, 111b) connected in series and arranged in fluid communication, overflow (51a, 51b) from a first rougher primary flotation cell arranged to flow directly into a secondary flotation line, - comprising a scavenger part with at least two scavenger primary flotation cells (112a, 112b) connected in series and arranged in fluid communication, overflow from the scavenger primary flotation cells arranged to flow back into a rougher flotation cell (111a, 111b) of the primary flotation line, or into a regrinding step and then into a scavenger cleaner flotation line, and - in which a subsequent primary flotation cell is arranged to receive primary underflow from a previous primary flotation cell so that a subsequent rougher primary flotation cell is arranged to receive primary underflow from a previous rougher primary flotation cell, the first scavenger primary flotation cell is arranged to receive primary underflow from the last rougher primary flotation cell, and a subsequent scavenger primary flotation cell is arranged to receive primary underflow from a previous scavenger primary flotation cell, and underflow from the primary flotation cells is directed downstream along the primary flotation line; - a further secondary flotation cell is arranged in direct fluid communication with at least one further rougher primary flotation cell, and arranged to receive primary overflow from the at least one further rougher primary flotation cell for the recovery of a first concentrate, the at least one further rougher primary flotation cell being different from the at least one rougher primary flotation cell from which the first secondary flotation cell is arranged to receive primary overflow, - the further secondary flotation cell is arranged in fluid communication with a previous secondary flotation cell, and - underflow from the first secondary flotation cell is arranged to flow into the further secondary flotation cell, or arranged to be combined with secondary underflow of the further secondary flotation cell.