Method of and an arrangement for transferring a process liquid, an industrial facility and a method of simplifying the layout of such

An arrangement for transferring a process liquid from a washing and thickening device to a subsequent process stage, the arrangement comprising the washing and thickening device (10) from which the process liquid is discharged at a first consistency, means for diluting the process liquid, a stand pipe (18) to which the process liquid is discharged, means (24) for measuring surface level of the process liquid in the stand pipe (18), a discharge outlet opening (20) for discharging diluted process liquid from the stand pipe (18), a pump (22) arranged in flow communication with the discharge outlet opening (20) for transferring the process liquid further in a second consistency, the measuring means being provided with a surface level control range having an upper surface level control limit (26) and a lower surface level control limit (28), characterized in that the diluting means comprises means (30, 44, 54) for spreading and feeding dilution liquid to the cross section of the stand pipe (18) in communication with the process liquid and that the diluting means (30, 44, 54) is positioned and dimensioned such that the average consistency of the process liquid in the surface level control range, i.e. a third consistency, is at least 1.5 times the second consistency.

An industrial facility having at least one tower (64, 66) for treating a process liquid, and a washing and thickening device (10) for washing and thickening the process liquid, characterized in that the washing and thickening device (10) is supported on the same floor BF with the tower (64, 66).

A method of simplifying the layout of an industrial facility used for treating a process liquid in at least two successive process steps, the industrial facility having a washing and thickening device with a structural height, where washing and thickening is performed, and a stand pipe used for transferring the process liquid from the washing and thickening device to a subsequent process step, the method comprising the step of performing at least one of

• Taking the structural height of the washing and thickening device in use,
• Arranging the introduction of the process liquid from the washing and thickening device to the stand pipe by means of an upwardly inclined feeding means, and
• Reducing the height of required surface level control range in the stand pipe, for bringing the washing and thickening device at a lower level in the industrial facility.