Method for extracting iodine from iodine enriched solution

Abstract

The invention discloses a method to extract iodine from enriched iodine solution, which comprises the following steps: fetching iodine reclaiming liquid as raw material with density at 15.00g / L-50.00g / L; adding into autoclave incorporating stirring device and condensing unit; operating stirring device; heating to 25-80 deg.c; setting the rotary speed of regulating stirrer at 300-600 / min; adding into activator; making the ratio of the weight of activator and iodine in the iodine reclaiming liquid at 0.1-0.3 per mill ; adjusting the flow quantity of oxidation agent; adding into autoclave in 15-40 min with 1-1.4 double oxidation agent of iodine in the iodine reclaiming liquid; keeping the reacting temperature at 30 min; adopting gradient cooling; setting the cooling amplitude at 5-15 deg.c per time; keeping 20-30 min; cooling into indoor temperature; getting rough iodine. The invention possesses short dealing cycle and high purity.

Description

technical field

[0001] The invention belongs to the field of chemical industry, and in particular relates to a method for extracting iodine from an iodine-enriched solution. Background technique

[0002] Iodine is the basic raw material for the preparation of iodide. Iodine is an essential nutrient element for the human body and plants. It is widely used in medicine, agriculture, dyes, metallurgy, synthetic rubber, national defense and cutting-edge technology. At present, it is more common to extract iodine from seawater, but the iodine content in seawater is only 0.05mg / L. The industry mainly uses the iodine contained in the solution of soaking and cleaning the kelp during the production of alginate and kelp food as a by-product to produce iodine. Usually, the process of producing iodine mainly adopts adding an oxidizing agent into the iodine-containing solution, blowing out the elemental iodine from the hot air, and then using a reducing agent to absorb and enrich it int...