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Method for preparing iodine by recovering high valency iodine associated with phosphate rock in wet-process phosphoric acid production

A high-valence iodine and wet-process phosphoric acid technology, applied in the direction of iodine, iodine/hydrogen iodide, etc., can solve problems such as disorderly discharge and environmental problems, reduce emissions and environmental pollution, low iodine recovery cost, and simple process flow Effect

Active Publication Date: 2017-06-27
ANHUI LIUGUO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to address the deficiencies of the prior art and provide a method for preparing iodized salt by reclaiming high-valence iodine associated with phosphate rock in the production of wet-process phosphoric acid, which can solve the disorder of iodate double salt associated with phosphate rock in the production process of phosphate fertilizer The environmental problems caused by emissions can be turned into treasures, and the corresponding iodine can be obtained directly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) In the acidolysis process, the gas SO is continuously or intermittently introduced into the phosphate pulp acidolysis tank 2 , calculated as the volume ratio of phosphate rock slurry, per 1M 3 Inject 30mg of gaseous SO into the phosphate slurry 2 ;

[0026] (2) In the phosphoric acid concentration process, use the sulfurous acid washing solution with a concentration of 0.1g / l to circulate and elute the free I in the gas phase. 2 Molecule, obtain iodine-containing circulating washing liquid;

[0027] (3) Concentrate the above-mentioned iodine-containing circulating cleaning solution by evaporating, until the hydrogen iodide concentration reaches 20g / l in the concentrated solution;

[0028] (4) Get the supernatant of the above-mentioned concentrated solution, add dropwise a commercially available hydrogen peroxide solution with a concentration of 27% by weight in the supernatant until no precipitation occurs in the solution, and filter to obtain solid-phase iodine....

Embodiment 2

[0030] (1) In the acidolysis process, the gas SO is continuously or intermittently introduced into the phosphate pulp acidolysis tank 2 , calculated as the volume ratio of phosphate rock slurry, per 1M 3 300mg of gaseous SO was introduced into the phosphate slurry 2 ;

[0031] (2) In the phosphoric acid concentration process, use the sulfurous acid washing solution with a concentration of 7.0g / l to circulate and elute the free I in the gas phase. 2 Molecule, obtain iodine-containing circulating washing liquid;

[0032] (3) Concentrate the above-mentioned iodine-containing circulating cleaning solution by evaporating, until the hydrogen iodide concentration reaches 150g / l in the concentrated solution;

[0033] (4) Get the supernatant of the above-mentioned concentrated solution, add dropwise a commercially available hydrogen peroxide solution with a concentration of 27% by weight in the supernatant until no precipitation occurs in the solution, and filter to obtain solid-pha...

Embodiment 3

[0035] (1) In the acidolysis process, the gas SO is continuously or intermittently introduced into the phosphate pulp acidolysis tank 2 , calculated as the volume ratio of phosphate rock slurry, per 1M 3 150mg gas SO was introduced into the phosphate slurry 2 ;

[0036] (2) In the phosphoric acid concentration process, use the sulfurous acid washing solution with a concentration of 3.5g / l to circulate and elute the free I in the gas phase. 2 Molecule, obtain iodine-containing circulating washing liquid;

[0037] (3) Concentrate the above-mentioned iodine-containing circulating cleaning solution by evaporating until the hydrogen iodide concentration reaches 50g / l in the concentrated solution;

[0038] (4) Get the supernatant of the above-mentioned concentrated solution, add dropwise a commercially available hydrogen peroxide solution with a concentration of 27% by weight in the supernatant until no precipitation occurs in the solution, and filter to obtain solid-phase iodine...

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Abstract

The invention discloses a method for preparing iodine by recovering high-valence iodine associated with phosphate rock in the production of wet-process phosphoric acid. 2 ; In the phosphoric acid concentration process, the free I that enters the gas phase is eluted with sulfurous acid washing liquid circulation 2 Molecule; Concentrate the circulating washing liquid, add hydrogen peroxide, and filter to obtain solid-phase iodine. By adding strong reducing SO to the acid hydrolysis tank of phosphate rock slurry 2 Gas, reducing the high valency iodate double salt in phosphate rock to free I 2 Molecules, so that high-valence iodine can be recycled, which can reduce the discharge of high-valence iodate double salt and environmental pollution; at the same time, the wet-process phosphoric acid process is not changed, the process flow is simple, the recovery cost is low, and the added value of the iodine product obtained is high.

Description

technical field [0001] The invention relates to a method for recycling associated iodine resources in phosphate rocks, in particular to a method for preparing iodine by recovering high-valence iodine associated with phosphate rocks in wet-process phosphoric acid production. Background technique [0002] Iodine resource is one of the scarce resources in the world and is an important strategic material of the country. Associated iodine in phosphate rock mainly exists in the form of negative monovalent iodine and high valent iodate. Negative monovalent iodine mainly occurs in fluorapatite Ca 5 [PO 4 ] 3 F or fluorocarbon ash Ca 5 [PO 4 ,CO 3 (OH)] 3 (F, OH); while the high valence iodate is mostly H + \Na + \K + \Ca 2+ Isocation and [IO 3 - ] Generated iodate double salt form exists. [0003] According to reports: the iodine in the Cambrian marine sedimentary phosphate rock is mainly NaIO 3 \KIO 3 \Ca(IO 3 ) 2 and KH (IO 3 ) 2 The double salt form of iso-hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/14
Inventor 沈浩许昕郑之银伍玉娇雷云丁军曾英朱英俊吴学俊薛刚路坊海卢康沈维婷周登风
Owner ANHUI LIUGUO CHEM CO LTD