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Method for simultaneously recovering iodine in iodine-containing fluosilicic acid and iodine-containing dilute phosphoric acid

A technology of iodofluorosilicic acid and dilute phosphoric acid, which is applied in the field of simultaneous iodine recovery, can solve the problems of low production efficiency and waste of resources, and achieve the effects of reducing equipment cost and energy consumption, reducing operating costs, and reducing equipment investment costs

Inactive Publication Date: 2015-06-10
贵州开磷碘业有限责任公司
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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 provide a method for simultaneously recovering iodine from iodine-containing fluorosilicate and iodine-containing dilute phosphoric acid, so as to solve the resource problem caused by the separate recovery of iodine-containing fluorosilicate and iodine-containing dilute phosphoric acid in the existing production technology. Waste, low production efficiency and other issues

Method used

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  • Method for simultaneously recovering iodine in iodine-containing fluosilicic acid and iodine-containing dilute phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Fluorosilicic acid 1m at 50°C 3 10m with dilute phosphoric acid at 85°C 3 After mixing, put it into an oxidation tank, add hydrogen peroxide and carry out a chemical reaction for 10 minutes, so that ionic iodine is oxidized into free molecular iodine, and the iodine content after oxidation is 43 mg / L; the volume ratio of the hydrogen peroxide and iodine-containing mixed acid is 0.10:100;

[0035] Send the oxidized iodine-containing mixed acid evenly into the extraction tower with a pump, enter and spray into the tower from the upper part of the extraction tower;

[0036] Use the blower to blow the normal temperature air 330m 3 Slowly and evenly send into the extraction tower from the lower part of the extraction tower, the volume of air is 30 times the volume of dilute phosphoric acid, that is, the gas-liquid ratio is 30:1;

[0037] The iodine-containing mixed acid is sprayed from top to bottom, and the air is blown out from bottom to top. Under the action of the inne...

Embodiment 2

[0039] Fluorosilicic acid 1.5m at 55°C 3 30m with dilute phosphoric acid at 85°C 3 After mixing, put it into an oxidation tank, add hydrogen peroxide to carry out a chemical reaction for 30 minutes, so that ionic iodine is oxidized into free molecular iodine, and the iodine content after oxidation is 46 mg / L; the volume ratio of the hydrogen peroxide and iodine-containing mixed acid is 0.05:100;

[0040] Send the oxidized iodine-containing mixed acid evenly into the extraction tower with a pump, enter and spray into the tower from the upper part of the extraction tower;

[0041] Use the blower to blow the normal temperature air 2200m 3 Slowly and evenly send into the extraction tower from the lower part of the extraction tower, the volume of air is 70 times the volume of the mixed acid, that is, the gas-liquid ratio is 70:1;

[0042] The iodine-containing mixed acid is sprayed from top to bottom, and the air is blown out from bottom to top. Under the action of the inner tray...

Embodiment 3

[0044] Fluorosilicic acid 2m at 55°C 3 30m with dilute phosphoric acid at 75°C 3 After mixing, put it into an oxidation tank, add hydrogen peroxide and carry out a chemical reaction for 30 minutes, so that ionic iodine is oxidized into free molecular iodine, and the iodine content after oxidation is 49 mg / L; the volume ratio of the hydrogen peroxide and iodine-containing mixed acid is 0.08:100;

[0045] Send the oxidized iodine-containing mixed acid into the extraction tower at a uniform speed, enter and spray into the tower from the upper part of the extraction tower;

[0046] Use the blower to blow the normal temperature air 1600m 3 Slowly and evenly send into the extraction tower from the lower part of the extraction tower, the volume of air is 50 times the volume of the mixed acid, that is, the gas-liquid ratio is 50:1;

[0047] The iodine-containing mixed acid is sprayed from top to bottom, and the air is blown out from bottom to top. Under the action of the inner tray ...

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Abstract

The method discloses a method for simultaneously recovering iodine in iodine-containing fluosilicic acid and iodine-containing dilute phosphoric acid. The method utilizes an air blow-out method to realize iodine recovery. The method is characterized in that iodine-containing fluosilicic acid and iodine-containing dilute phosphoric acid are mixed into an iodine-containing mixed acid; in the same recovery device, the iodine-containing mixed acid and an oxidizing agent undergo a reaction; iodine molecules are blown out by normal-temperature air, wherein an air-liquid ratio which is a volume ratio of blown air to the iodine-containing mixed acid is low; and phosphoric acid and fluosilicic acid in the iodine-containing mixed acid can be separated by condensation. The method saves a construction investment and a space resource, reduces an equipment cost and energy consumption, reduces an operation cost, has good economic benefits, and saves manpower resources; before entering into an extraction tower, air is not heated and has a normal temperature so that energy consumption, equipment configuration and an equipment cost are reduced; through the low air-liquid ratio, the size of the extraction tower is effectively reduced and an equipment construction and maintenance cost is greatly reduced; and after iodine extraction, phosphoric acid and fluosilicic acid can be separated so that phosphoric acid production is promoted.

Description

technical field [0001] The invention relates to a method for simultaneously recovering iodine from iodine-containing fluorosilicic acid and iodine-containing dilute phosphoric acid. Background technique [0002] The associated iodine in phosphate rock mainly enters the dilute phosphoric acid and the fluosilicic acid washed by the tail gas of phosphoric acid extraction during the production of wet-process phosphoric acid. In the prior art, the iodine in iodine-containing fluorosilicate acid and iodine-containing dilute phosphoric acid is recovered separately, that is, a set of equipment is established for the iodine recovery process in fluorosilicate acid, and iodine is recovered in iodine-containing dilute phosphoric acid. The process builds a recovery device. At present, phosphorus chemical enterprises mainly use the air blowing method to recover iodine in iodine-containing dilute phosphoric acid. The air blowing extraction process can be used for iodine stock solution wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/14C01B25/237C01B33/10
Inventor 李凯廖吉星周勇王先炜喻茂朱飞武何国勇杨俊杰唐明亮
Owner 贵州开磷碘业有限责任公司
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