Method of manufacturing a separation fence and separation fence

1. A method for fabricating a separation fence capable of being used in a hydrometallurgical liquid-liquid solvent extraction settler, in which method the fence is manufactured of a polymer resin material and has a front wall and a rear wall, at least one of the front wall and rear wall defining outwardly directed bulges extending horizontally along the a respective width of the fence, to form complementary recesses on at least one respective inner surface of the fence, characterized in that the fence is manufactured as a shell-like integral piece by rotational molding.

2. The method according to claim 1 , characterized in that the method comprises

fabricating a mold composed of two mold halves, comprising a first mold half and second mold half, said mold halves having walls, the inner surface of which corresponds to the outline of the fence,

supporting the mold to be rotational about two perpendicular axes,

pouring a charge of a polymer resin material powder inside the first mold half,

installing the second mold half on the first mold half to close the mold,

rotating the mold around the two perpendicular axes,

heating the mold while it is rotating around the two perpendicular axes to melt the polymer resin material and to disperse and stick it to the walls of the mold halves as a layer having a substantially even thickness and forming the fence,

stopping the heating of the mold,

cooling the mold, and

opening the mold by separating the mold halves and removing the fence from the mould.

3. The method according to claim 2 , including the step of performing finishing operations on the fence.

4. A separation fence capable of use in a hydrometallurgical liquid-liquid solvent extraction settler, which fence is made of a polymer resin material, characterized in that the fence is a rotationally molded shell-like integral piece and has a front wall and a rear wall, at least one of the front wall and rear wall defining outwardly directed bulges extending horizontally along a respective width of the fence, to form complementary recesses on at least one inner surface of the fence.

5. The fence according to claim 4 , characterized in that the fence has a general shape of a flat rectangular casing having a hollow inner space.

6. The fence according to claim 5 , further comprising two vertical side walls, a top wall and a bottom wall.

7. The fence according to claim 6 , further comprising

an inlet opening located at the lower part of the front wall, said inlet opening being, in operation, adapted to receive a flow of dispersion to enter an inner space between the front wall and the rear wall, and

an outlet opening located at the rear wall at an elevated level in relation to the inlet opening so that, in operation, the dispersion is forced to flow vertically in the inner space between the front wall and the rear wall and out through said outlet opening.

8. The fence according to claim 7 , characterized in that the fence comprises trough-channels extending through the fence at the upper part of the fence at a level above the outlet opening.

9. The fence according to claim 7 , characterized in that the polymer resin material comprises carbon fibers.

10. The fence according to claim 8 , characterized in that the polymer resin material comprises carbon fibers.

11. The fence according to claim 4 , characterized in that the polymer resin material comprises carbon fibers.