Method for recovering iodine

A technology for recovering iodine and solution, which is applied in the field of iodine recovery, can solve the problems of low iodine ion content and difficult recovery, and achieve good adsorption effect, high economic benefit and consumption saving effect

Inactive Publication Date: 2013-07-03
施一飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a method for extracting iodine in the waste liquid, for the situation that the iodide ion content in the solution is low and difficult to recycle,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] The recovery of iodine is carried out as follows:

[0024] (1) Recovery of inorganic iodine: use the platinum electrode as the working electrode and the calomel electrode as the reference electrode to control the reaction, insert the platinum electrode and the calomel electrode into the waste liquid, connect an external ZF-3 potentiostat, and slowly add dropwise thereto. 0.3mol / L sodium sulfite solution and fully stirred, record the change of the amount of reducing agent added and the electrode potential of the solution, when the electrode potential jumps, which is a jump point on the electrode potential map, stop adding sodium sulfite solution to it, The precipitated iodine was collected.

[0025] (2) recovery of organic iodine: add dilute sulfuric acid to adjust pH value at 0.5 in the waste liquid after the above-mentioned reaction, add 5% sodium hypochlorite to oxidize and recover organic iodine, add 1 mol / L sodium carbonate solution to the waste liquid sediment, and...

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Abstract

The invention discloses a method for recovering iodine, which is coupled with the electrochemical method to control the redox level, and recovers the inorganic iodine in liquid waste. A sodium hypochlorite solution is used for oxidizing and recovering organic iodine. The iodide ion content of the recovered liquid waste is about 0.3%. The iodine in the recovered liquid waste is gathered and recovered by using strong basicity anion exchange resin. The iodate ion is reduced to iodine by the method in one step. The complicated operations of reducing iodate ions into iodide ions firstly and then oxidizing into iodine are prevented. The usage amount of the oxidizing and reducing agents is reduced. Therefore, the cost is reduced, and the method for recovering iodine can bring high economic benefit to industrial production.

Description

technical field [0001] The invention relates to a purification method, in particular to a method for recovering iodine. Background technique [0002] Iodine is distributed all over the world, but there are few iodine resources that can be exploited, and the situation of iodine deficiency will not change in the short term. Generally speaking, the total reserves of iodine in the ocean are very large, up to 82.2 billion tons, which is called the "iodine library" of nature. The concentration of iodine in seawater varies with the terrain and water depth, but the overall concentration is low and difficult to extract. At present, the extraction of iodine from seawater is still in the exploratory and experimental stage. The world's major iodine-producing countries are Japan, Chile and the United States. Japan uses natural gas field water as raw material to extract iodine, Chile produces iodine by-producing sodium nitrate from natural saltpeter ore, and the United States extracts i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/14
Inventor 陶持天
Owner 施一飞
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