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A method for recovering iodine from iodine-containing sewage

A technology for recovering iodine and sewage, applied in the electrolysis process, electrolysis components, etc., can solve the problems of oxidant or reducing agent polluted environment, recovery yield, unsatisfactory and other problems, and achieve the effect of avoiding impact on the environment, convenient operation and simple equipment

Active Publication Date: 2017-03-01
南通青华纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these two methods are that the oxidizing agent or reducing agent used pollutes the environment and the recovery yield is not ideal, only about 70%.

Method used

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  • A method for recovering iodine from iodine-containing sewage

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Comparison scheme
Effect test

Embodiment 1

[0020] Heat and concentrate iodine-containing industrial wastewater to make the concentration of potassium iodide reach 0.1mol / L. Put the prepared anode into the solution, connect it to direct current, and use a reference electrode to determine the voltage applied to the anode as 1.05V. After 24 hours of energization, the solution Titration with silver nitrate solution consumes 4.6mL of silver nitrate solution. By calculation, the reaction rate of I- in the solution is 54%. Carbon tetrachloride is used to recover 0.652g of elemental iodine, and the final recovery rate is 51.3%.

Embodiment 2

[0022] Heat and concentrate iodine-containing industrial wastewater to make the concentration of sodium iodide reach 0.2mol / L, put the prepared anode into the solution, connect to direct current, use a reference electrode to determine the voltage applied to the anode as 0.95V, and after 24 hours of power on , the solution was titrated with silver nitrate solution, and 10.9 mL of silver nitrate solution was consumed. By calculation, the reaction rate of iodide ion in the solution was 45.5%, and carbon tetrachloride was used to reclaim 1.16 g of elemental iodine, with a final recovery rate of 43.2%.

Embodiment 3

[0024] Heat and concentrate iodine-containing industrial wastewater to make the iodine ion concentration reach 0.3mol / L, put the prepared anode into the solution, connect it to direct current, use a reference electrode to determine that the voltage applied to the anode is 0.9V, and after 24 hours of power on, The solution was titrated with silver nitrate solution, and 10.2 mL of silver nitrate solution was consumed. By calculation, the reaction rate of iodide ion in the solution was 66%, and 2.51 g of elemental iodine was recovered by carbon tetrachloride, with a final recovery rate of 62.7%.

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Abstract

The invention discloses a method for recovering iodine from iodine-containing wastewater. The method is environment-friendly, safe and convenient to operate. The method comprises the following steps: (1) concentrating the wastewater to obtain a liquid with iodine ion concentration of not less than 0.1mol / L; (2) using a titanium plate coated with an iridium or ruthenium-containing coating as an anode material in the liquid in the step (1), and connecting to a power supply and stirring at room temperature; (3) depositing part of iodine at the bottom of the liquid after electrolysis, and collecting the part of iodine by adopting a suction filtration method, wherein the part of iodine in the liquid is obtained by carbon tetrachloride extraction and distillation; and (4) measuring and obtaining 10mL of the liquid after reaction by using a transfer pipette, titrating by using a silver nitrate liquid with concentration of 0.1mol / L, and calculating the reaction rate of iodine ions according to the volume of the consumed silver nitrate liquid.

Description

technical field [0001] The invention relates to a method for recovering iodine, more specifically to a method for recovering iodine from iodine-containing sewage, and belongs to the field of iodine material preparation. Background technique [0002] Iodine is a halogen element that is widely distributed in nature, but its content is scarce and it is not easy to mine. Iodine is widely used and plays an important role in industry, agriculture and cutting-edge technology. Iodine plays an important role in human health and is an essential element for the human body. At present, a large amount of iodine-containing sewage will be produced in production, such as phosphate rock chemical enterprises, polarizing film production enterprises, etc. If the solution containing iodine ions is discharged directly, it will not only pollute the environment but also waste resources, so the recovery method of iodine is more and more popular. countries' attention. At present, most of the recove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/24
Inventor 朱承飞贾景龙邓世海吴慧斌
Owner 南通青华纳米材料有限公司