Reclaim And Enrichment Of Iodine

This article takes the waste water which produces triiodobenzoic acid as the object. We study the technology of reclaiming inorganic and organic iodine and the enrichment the low concentration iodine.The iodine in the waste water mostly takes the form as iodate anion. Because iodine is an important and very lacking resource in the world, so to reclaim it is a significant thing. We studied the condition of reclaiming iodine and found the way of measuring the amount of iodine in the waste water. The method shows that it is very simply to manipulate and the result is very precise and the method can be applied to all kinds of measuring way especially to microanalysis of iodine.To reclaim the inorganic iodine in the solution, we use electrochemistry for the first time. We can get a higher effect when the electromotive force between -600mv～-550mv. This method efficiently controls the degree of deoxidization and saves the oxidant in the same time. This is our one of innovations and by this way the reclaim ration of iodine can preponderate over 90%. To check up the method above whether is effectual, we use a mature method of oxidating iodide anion by sodium hypochlorite and in the same time control the reaction by electrochemistry. The result shows that deoxidizing iodate anion directly has the same effect and the reclaim of iodine is over 90%. The method by reducing agent economizes the cost consumedly.To reclaim the organic iodine in the waste water, we take the pure substance of triiodobenzoic acid as the object. We spurn the traditional way of distillation and adopt sodium hypochlorite as oxidant. We find that the pH has a great effect during the process. We can get a higher oxidation ratio about 70% when the pH in the rang of 0.5~1.0. But it still has interspace to improve the oxidation ratio. The sedimentary solid in the waste water contains a lot iodine about 1%. We use the theory that sodium carbonate can response to benzene formate but can't response to iodine and we can get iodine directly by filtration. The addition of sodium carbonate is about 10mL/g sedimentary solid. The solution after filtration contains iodine about 0.3% and the indiscerptible substance can...