A method for separating two solutions mixed in dispersion into two solution phases in a liquid-liquid extraction separation cell, in which method the dispersion is fed into the cell at the center of the feed end, wherein - the supplied dispersion is divided at the feed end of the cell into sideways proceeding flows by means of a first guide wall positioned at an inclined angle (α) with respect to the vertical direction in order to distribute the dispersion flow along the whole width of the cell, and in between the bottom edge of said wall and the cell bottom, there is a clearance gap, which is widened from the center towards the sides of the cell, through which clearance gap the dispersion is forced to proceed in the vicinity of the cell bottom, - the dispersion distributed along the width of the cell is prevented from proceeding directly in the lengthwise direction of the cell by means of said first guide wall, and the dispersion is allowed to proceed in the lengthwise direction of the cell only in the vicinity of the cell bottom by means of said clearance gap, - the dispersion flow proceeding through the clearance gap is by means of a second guide wall conducted to rise from the vicinity of the bottom of the cell diagonally upwards at an inclined angle (α), said second guide wall being essentially parallel with the first guide wall and located at a distance (L 1) therefrom, so that in between the first guide wall and the second guide wall, there is created an uptake shaft extending diagonally upwards at an inclined angle (α), in which uptake shaft the dispersion rises upwards and is compressed, - the compressing dispersion rising in the uptake shaft is divided into a number of sub-flows proceeding essentially in the lengthwise direction of the cell by means of a number of vertical slots provided in the second guide wall, said slots being arranged as a horizontal line of vertical slots along the width of the second guide wall, at a distance from the bottom edge of the second guide wall, so that the dispersion, when reaching the line of vertical slots, has a predetermined degree of compression, - the vertical component of the sub-flows discharged through the vertical slots is attenuated and the sub-flows are conducted to proceed essentially in the lengthwise direction of the cell by means of a slanting plate, which is attached to the second guide wall in the vicinity of the top part of the line of vertical slots, to a separator part, where the solutions are separated from the dispersion step by step into two successive solution phases, and - the solution phase separated from the sub-flows on the bottom of the cell is prevented from flowing back towards the feed end by arranging the second guide wall so that its bottom edge is pressed tightly against the cell bottom. - the supplied dispersion is divided at the feed end of the cell into sideways proceeding flows by means of a first guide wall positioned at an inclined angle (α) with respect to the vertical direction in order to distribute the dispersion flow along the whole width of the cell, and in between the bottom edge of said wall and the cell bottom, there is a clearance gap, which is widened from the center towards the sides of the cell, through which clearance gap the dispersion is forced to proceed in the vicinity of the cell bottom, - the dispersion distributed along the width of the cell is prevented from proceeding directly in the lengthwise direction of the cell by means of said first guide wall, and the dispersion is allowed to proceed in the lengthwise direction of the cell only in the vicinity of the cell bottom by means of said clearance gap, - the dispersion flow proceeding through the clearance gap is by means of a second guide wall conducted to rise from the vicinity of the bottom of the cell diagonally upwards at an inclined angle (α), said second guide wall being essentially parallel with the first guide wall and located at a distance (L 1) therefrom, so that in between the first guide wall and the second guide wall, there is created an uptake shaft extending diagonally upwards at an inclined angle (α), in which uptake shaft the dispersion rises upwards and is compressed, - the compressing dispersion rising in the uptake shaft is divided into a number of sub-flows proceeding essentially in the lengthwise direction of the cell by means of a number of vertical slots provided in the second guide wall, said slots being arranged as a horizontal line of vertical slots along the width of the second guide wall, at a distance from the bottom edge of the second guide wall, so that the dispersion, when reaching the line of vertical slots, has a predetermined degree of compression, - the vertical component of the sub-flows discharged through the vertical slots is attenuated and the sub-flows are conducted to proceed essentially in the lengthwise direction of the cell by means of a slanting plate, which is attached to the second guide wall in the vicinity of the top part of the line of vertical slots, to a separator part, where the solutions are separated from the dispersion step by step into two successive solution phases, and - the solution phase separated from the sub-flows on the bottom of the cell is prevented from flowing back towards the feed end by arranging the second guide wall so that its bottom edge is pressed tightly against the cell bottom.