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Method for recovering iodine from industrial byproduct containing KI

A technology for by-product and iodine recovery, applied in the field of iodine recovery, can solve the problems of low recovery rate and high iodine production cost, and achieve the effects of short reaction time, reduced equipment investment and low reaction temperature

Inactive Publication Date: 2013-08-21
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome shortcomings such as high iodine production cost and low recovery rate in the prior art, the invention provides a method for reclaiming iodine from industrial by-products containing KI

Method used

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  • Method for recovering iodine from industrial byproduct containing KI
  • Method for recovering iodine from industrial byproduct containing KI

Examples

Experimental program
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Embodiment 1

[0040] This embodiment combines the attached figure 1 The present invention is further described in detail:

[0041] In raw material liquid preparation device 1, be raw material with the industrial by-product that contains KI, with from I 2 The filtered mother liquor of the crystallization tank reaction system is used as a solvent, and the preparation concentration is a raw material solution of 8.5mol / L, which is the same as the original concentration;

[0042] The prepared raw material liquid is transported to the raw material liquid storage tank 3 by the acid-resistant pump I2 for standby, and the raw material liquid in the storage tank 3 is added to the KH with stirring and temperature control functions by the acid-resistant pump II4 2 PO 4 In the crystallization kettle 5, under the condition that the stirring rate is controlled at 4r / min and the reaction temperature is controlled at 3°C, KH is added in a steady flow. 2 PO 4 Crystal modifier Ⅰ and industrial grade wet-p...

Embodiment 2

[0048] Use industrial by-products containing KI as raw materials to 2 The filtered mother liquor of the reactant system of the crystallization tank is used as a solvent to prepare a raw material solution with a concentration of 3.0mol / L, which is the same as the original concentration;

[0049] The prepared raw material liquid is transported to the raw material liquid storage tank by the acid-resistant pump I for standby, and the raw material liquid in the storage tank is added to the KH with stirring and temperature control functions by the acid-resistant pump II 2 PO 4 In the crystallization tank, under the condition that the stirring rate is controlled at 8r / min and the reaction temperature is controlled at 20°C, add KH at a steady flow. 2 PO 4 Crystal modifier Ⅰ and industrial grade wet-process phosphoric acid, KH 2 PO 4 The amount of crystal modifier I is 0.30‰ of the total mass of the raw material liquid in the kettle, and its composition is composed of cetyl alcohol...

Embodiment 3

[0055] Use industrial by-products containing KI as raw materials to 2 The filtered mother liquor of the reactant system of the crystallization tank is used as a solvent to prepare a raw material solution with a concentration of 4.0mol / L, which is the same as the original concentration;

[0056] The prepared raw material liquid is transported to the raw material liquid storage tank by the acid-resistant pump I for standby, and the raw material liquid in the storage tank is added to the KH with stirring and temperature control functions by the acid-resistant pump II 2 PO 4 In the crystallization tank, under the condition that the stirring rate is controlled at 6r / min and the reaction temperature is controlled at 15°C, add KH at a steady flow. 2 PO 4 Crystal modifier Ⅰ and industrial grade wet-process phosphoric acid, KH 2 PO 4 The amount of crystal modifier I is 0.20‰ of the total mass of the raw material liquid in the kettle, and its composition is composed of cetyl alcohol...

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Abstract

A method for recovering iodine from an industrial byproduct containing KI relates to a recovery method of iodine. The method comprises the following steps: preparing a raw material into a raw material liquid; conveying the raw material liquid to the inside of a monopotassium phosphate crystallization kettle; obtaining a feed level monopotassium phosphate byproduct by controlling proper conditions; conveying a reaction solution from the kettle to the inside of an iodine crystallization kettle; and at lower temperature, finally obtaining a medical level iodine product by adding proper crystallization improvement agent and composite oxidant. According to the method disclosed by the invention, reaction conditions are mild, the requirement on the material of the equipment is not high, the medical level iodine quality of the obtained main product completely meets national stand and the recovery rate is higher.

Description

technical field [0001] The invention relates to a method for recovering iodine, in particular to a method for recovering iodine from industrial by-products containing KI. Background technique [0002] Iodine is a raw material for the manufacture of inorganic and organic iodides. It has a wide range of uses in agriculture, medicine, dyes, metallurgy, and national defense industries. Iodine resources mainly exist in various natural brines (underground brine, petroleum brine, natural gas brine), Chilean In saltpeter, seaweed and phosphate rock, most of them exist in the form of associated resources, the content is low, and the recovery cost is high. At present, the main production methods of iodine are: air blowing method and ion exchange method. The former is to pass chlorine gas or chlorine water into the iodine-containing raw material liquid to oxidize iodine ions into elemental iodine, blow out hot air, and then absorb it with sulfur dioxide aqueous solution. Enrichment, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/14C01B25/30
Inventor 段永华张军解田卢伟伟姚开胜
Owner HENAN UNIV OF SCI & TECH