By using the primary evaporation kettle, the secondary evaporation kettle and the tertiary

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing seawater salt and bittern using seawater, particularly a method for efficiently manufacturing seawater salt and bittern with stable qualities.;SOLUTION: Three kinds of kettles, i.e. primary, secondary and tertiary kettles for evaporation by heating are used as manufacturing facilities. In the primary kettle, a calcium salt which causes clogging of a tube wall etc., in piping is removed, and in the secondary kettle, primary brine obtained in the primary kettle is further heated and concentrated to be separated into seawater salt and secondary brine. In the tertiary kettle, the secondary brine obtained in the secondary kettle is further heated, concentrated and filtered to obtain the bittern. These three steps are serially performed to enable efficient, simultaneous manufacturing of seawater salt and natural bittern with stable qualities.;COPYRIGHT: (C)2005,JPO&NCIPI