Abstract
Natural salt production has rapidly been increasing in Okinawa after 1997. In this paper, we report some production methods of natural salt, which have been employed in Okinawa, and propose a high performance concentrator of sea water from 3.5% to 25% and two low-cost salt-production systems, i. e. a spray drying system and a double dram drying system. The concentrator can reduce energy consumption by 85%. The two systems can drastically reduce labor costs.
