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The objective of the project was to demonstrate the feasibility of utilising a semi-open refrigeration cycle for the crystallisation of inorganic salts from an aqueous mother liquor, with subsequent energy recovery. Tests were carried out on both laboratory and pilot plant scales, utilising n-butane as the refrigerant. They involved investigations into: i) the effect of nozzle design and temperature on evaporation and condensation rates; ii) the temperature distribution in the condenser; iii) the effect of varying the condensation pressure; iv) the separation rate for the liquid components; v) the rate of oxygen build-up in the system, and vi) the physical and chemical condition of crystals formed. The results indicate the ability of the system to achieve the desired heat transfer and separation rates. Crystals formed were found to be very fine and exhibited little evidence of contamination by the refrigerant. It was possible to reheat the purified liquor very efficiently to approximately the incoming mother liquor temperature, thus confirming the overall thermodynamic efficiencies of this system.

Additional information

Authors: LEWIS B, British Steel plc, London (GB);POWELL J M, British Steel plc, London (GB)
Bibliographic Reference: EUR 13645 EN (1991) 116 pp., MF, ECU 8, blow-up copy ECU 20
Availability: (2)
Record Number: 199111164 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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