Method for removing trace iodine in chlor-alkali brine by using ozone
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A chlor-alkali brine and ozone technology, applied in the direction of electrolysis components, electrolysis process, etc., can solve the problems of difficult control of reducing agent and oxidant ratio, easy introduction of new impurities, cumbersome operation, etc., to achieve easy control of reaction process, good removal effect, Simple to use effects
Inactive Publication Date: 2014-06-18
CHONGQING UNIV
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But the ratio of reducing agent and oxidizing agent in this method is not easy to control, easy to introduce new impurities, and difficult to remove
In addition, this method needs to go through multiple steps such as stirring, pH adjustment, and filtration, and the operation is relatively cumbersome.
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Embodiment 1
[0035] Factory chlor-alkali brine, the initial iodine content in brine was measured to be 1.96mg / L. Inject brine to a volume of 1m 3 cylindrical reactor. The reactor is equipped with a ventilation coil, and the coil is placed at the bottom of the reactor, and the exhaust holes are evenly distributed on the coil. The brine temperature is controlled at 30°C, and the ozone rate of the coil is 3m 3 / h, after aeration reaction 60min, measure the iodine content in the brine with spectrophotometry to be 0.89mg / L.
Embodiment 2
[0037] Factory chlor-alkali brine, the initial iodine content in brine was measured to be 1.86mg / L. Inject saline into a volume of 1m 3 cylindrical reactor. The reactor is equipped with a ventilation coil, and the coil is placed at the bottom of the reactor, and the exhaust holes are evenly distributed in the coil. The brine temperature is controlled at 30°C, and the ozone rate of the coil is 6m 3 / h, after aeration reaction 80min, measure the iodine content in the brine with spectrophotometry to be 0.73mg / L.
Embodiment 3
[0039] Factory chlor-alkali brine, the measured initial iodine content in brine is 1.66mg / L. Inject saline into a volume of 1m 3 cylindrical reactor. The reactor is equipped with a ventilation coil, and the coil is placed at the bottom of the reactor, and there are small exhaust holes on the coil. Control the brine temperature to 30°C, and the ozone rate to 9m 3 / h, after aeration reaction time 100min, the iodine content measured by spectrophotometry was 0.64mg / L.
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Abstract
Currently, alkali is made mainly by using an ion membrane electrolysis technology in industry, and mainly adopted raw materials include industrial brine, salted bittern and whole bittern. Due to the particularity of ionic membrane caustic soda production, brine is always recycled and not discharged to the outside, and some ions can not be processed by existing primary brine and secondary brine, over time, ion concentration is formed, and causes serious influence on the current efficiency and the service lives of ionic membranes. Especially, iodine ions exist in large-molecular-weight Na3H2IO6 and Ba3H4 (IO6) 2 forms in the process of electrolysis, so that the iodine ions block an ionic membrane channel so as to hinder the passing of sodium ions, thereby reducing the current efficiency, and shortening the service lives of ionic membranes. The ionic membranes are expensive, so that the frequent replacement of the ionic membranes is adverse to the benefits of factories. Therefore, removing iodine in brine is the most economic and effective measure. According to a method for removing trace iodine in chlor-alkali brine by using ozone, disclosed by the invention, ozone is taken as an oxidant and iodine blowing for gas removal is implemented, so that iodine in brine is removed in one step, no impurity is introduced, and no pollution is caused. The method is simple in operation, high in efficiency and low in energy consumption, and can remove most of iodine in brine, therefore, the method has obvious application advantages.
Description
technical field [0001] The invention relates to a method for removing iodine in chlor-alkali brine, which mainly adopts the method of chemical oxidation and gas blowing. Background technique [0002] Due to the particularity of ion membrane alkali production, the brine has not been discharged, so that impurity ions are continuously enriched and exceed the bearing capacity of the ion membrane. In recent years, especially the impact of the enrichment of iodide ions on the ion membrane has received great attention, because the iodide ions contained in brine will generate Na with a very large molecular weight during the electrolysis process. 3 h 2 IO 6 、Ba 3 h 4 (IO 6 ) 2 , will block the ion membrane channel, hinder the passage of sodium ions, reduce the current efficiency, and shorten the life of the ion membrane. However, the ionic membrane is expensive, such as frequent replacement of the ionic membrane, which is extremely unfavorable to the interests of the factory. ...
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