coalescer forms a dense flow barrier in the tank so that the entire flow of extraction solution takes place via the flow channels the flow plates are positioned at a distance from each other of 2 6 mm in elevation preferably 3 5 mm the flow plates are angled obliquely upwards in the direction of flow at an angle of 5 30 degrees preferably at 10 20 degrees to the horizontal the number of flow channels and flow plates is chosen so that the flow in the channels is largely laminar when the viscosity of the extraction solution is for instance in the range of 1 5 7 cp it is preferable to keep the flow rate around 0 08 0 20 m s preferably between 0 12 0 17 m s the droplet coalescer extends vertically above the surface of the liquid 18 in the settler situated in the lower section of the device near the bottom there are several guide plates forming a connecting channel cassette 19 via which the enriched aqueous solution in the bottom layer is made to move forwards in the tank evenly the guide plates forming the connecting channel are in principle the same type as the flow plates in the upper section of the device the connecting channel plates however when seen in the direction of flow are inclined downwards at an angle of 10 45 degrees preferably 25 35 degrees the number of connecting channel guide plates is far smaller than that of the flow plates so that there are 1 9 u2153 of the number of flow plates the surfaces of both the flow plates and the guide plates.