Blowimg-Out Method

This method takes advantage of the easy vaporization property of iodine and is suited to processing brine at high temperature. First, sand and impurities in the brine are settled out and removed. An oxidizing agent is added and the brine is oxidized. The oxidized brine diffuses to the top of a blowing-out tower and the iodine vaporizes. This vapor is then drawn into an absorption tower where it comes into contact with an absorbing agent, which absorbs and concentrates the iodide. Chlorine is added to the iodide solution to crystallize the iodine. These crystals are melted and refined before the iodine can be delivered to customers.

Ion-Exchange Resin Method

Sand and impurities in the brine are removed through settling and filtering. An oxidizing agent is added and the brine is oxidized. The resultant brine is passed through a column packed with an ion-exchange resin that adsorbs the iodine, which is in the form of a poly-iodide. The resin is then removed and transferred to an elution column where the poly-iodide is eluted with a sulfite solution. Chlorine is added to the eluted solution and iodine crystallized out. These crystals are melted and refined before the iodine can be delivered to customers.