Mixer-settlers, both as stand-alone and as in-column type, are offered for special applications. As implied by the name, the mixer-settler-column is a series of mixer-settlers in the form of a column. It consists of a number of stages installed one on top of the other, each hydraulically separated, and each with a mixing and settling zone (see below). This design enables the elimination of some of the main disadvantages of conventional mixer-settlers, whilst maintaining stage-wise phase contact.

The mechanical design of the mixer-settler-column is comparable to the agitated ECR Kühni column.

Key characteristics

  • For long residence times: >15 min Extraction controlled by residence time
  • Reactive extraction systems
  • Long phase separation
  • For extraction controlled by pH (stage-wise pH adjustment)
  • For batch extraction
  • Stage-wise phase contact
  • Additionally for ECMS mixer-settler-columns:
  • Small footprint
  • Column-like design
  • Extreme to unlimited phase ratio