Method for refining industrial coarse iodine

Abstract

The invention relates to a method for refining industrial crude iodine. The method comprises the steps that the industrial crude iodine with the iodine content accounting for 70 to 95 percent is adopted as material to be added into a sublimator which is provided with concentrated sulfuric acid, a temperature measurement device and a gas blowing-out device; the ambient temperature of a crystallization device is controlled to be 20 DEG C, the sublimator is first heated to 60 to 90 DEG C and the sublimated iodine is caused to flow into a crystallizer by using the gas with the flow rate of 8 to 15L / min; after being maintained for 40 to 60 min, the temperature of the sublimator is heated to 160 to 200 DEG C and the gas-flow rate is adjusted to 1 to 1.5L / min so as to continue to collect the remaining iodine. By adopting the refining method, the content of volatile impurities in iodine products can be effectively reduced; multi-level crystallization devices are adopted to be connected in series to prevent the loss of the iodine and improve the working efficiency of the iodine sublimator. The obtained refined iodine products have neat appearance, large particle size and low impurity content. In addition, the refining method of the invention has the advantages of easy industrialization, low investment, high recovery rate and cleanness without pollution, etc., and can also increase the added value of the iodine products as well as generate relatively high economic and social benefits.

Description

technical field [0001] The patent of the present invention relates to a method for refining iodine, in particular to a method for preparing refined iodine from industrial crude iodine. 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. With the continuous development of science and technology, the iodine industry has developed from the original iodine industrial production using seafood as raw material to the direction of producing industrial crude i...

AI Technical Summary

Problems solved by technology

And the product obtained by the above patents is just a slightly higher industrial crude iodine product, which cannot meet the growing demand for higher refined iodine with purity

However, the traditional refining method of crude iodine has an old and backward process, is not easy to form industrialized production, has low efficiency, and low recovery rate, and the impurity content in the obtained iodine product is relatively high

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