Cellulose production

Liquor regeneration

The black liquor resulting from the pulp cooking process contains valuable chemicals as well as organic substances. It is therefore treated in the chemical recovery plant and returned to the digester. The liquor regeneration encom-passes thickening to black liquor, incineration in the liquor recovery unit, reduction of the chemicals, dilution to green liquor, caustic processing to white liquor and filtration. The processes are carried out at temperatures up to +130 °C and pressures up to +3 bar, the media are highly corrosive and partly abrasive.

Density measurement with MINITRAC 31

Environmentally harmless and energy efficient liquor regeneration requires exact information about the concentration, i.e. density, of the media. Due to the process conditions mentioned above, radiometric density measurement with MiniTrac 31 is the first choice for instrumentation. The device measures with high precision directly and contactlessly through the pipes – no intrusion into the closed system is necessary.