Gas-liquid mixed extraction iodine recovery technology

A gas-liquid mixed extraction and iodine recovery technology, which is applied in the direction of iodine, iodine/hydrogen iodide, etc., can solve the problems that the iodine molecular extraction method of iodine-containing phosphorus rocks has not been explained, and the iodine cannot be extracted simultaneously, and the recovery rate is high. , improve the purity, low economic cost effect

Active Publication Date: 2012-10-17
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to extract iodine from iodine-containing dilute phosphoric acid, and its disadvantage is that it cannot simultaneously extract iodine from iodine-containing waste gas
This method must be used...

Method used

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  • Gas-liquid mixed extraction iodine recovery technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take a total of 1000kg of phosphate rock containing 76ppm of iodine, stir, clarify, and filter to produce iodine-containing dilute phosphoric acid to generate iodine-containing waste gas. The iodine-containing dilute phosphoric acid is introduced into the gas-liquid mixed extraction integrated iodine recovery device, and the iodine-containing waste gas is introduced into the device at the same time. First add hypochlorous acid to iodine-containing dilute phosphoric acid, and under the action of the gas-liquid mixing separator inside the device, the iodine-containing gas and liquid are fully mixed, and the iodine in the acid enters the gas phase state. Then, the iodine-rich gas is introduced into the upper part of the recovery device through the inverted funnel device inside the gas-liquid mixed extraction integrated iodine recovery device, and the temperature is controlled at 39°C. Iodine is recovered with 2% sulfurous acid solution, and the obtained iodine-containing cl...

Embodiment 2

[0026] Take a total of 1000kg of phosphate rock containing 45ppm iodine, stir, clarify, and filter to produce iodine-containing dilute phosphoric acid, and generate iodine-containing waste gas. The iodine-containing dilute phosphoric acid is introduced into the gas-liquid mixed extraction integrated iodine recovery device, and the iodine-containing waste gas is introduced into the device at the same time. First add perchloric acid to iodine-containing dilute phosphoric acid, and under the action of the gas-liquid mixing separator inside the device, the iodine-containing gas and liquid are fully mixed, and the iodine in the acid enters the gas phase state. Then, the iodine-rich gas is introduced into the upper part of the recovery device through the inverted funnel device inside the gas-liquid mixed extraction integrated iodine recovery device, and the temperature is controlled at 36°C. Iodine is recovered with 3% sulfurous acid solution, and the obtained iodine-containing clear...

Embodiment 3

[0028] Take a total of 1000kg of phosphate rock containing 30ppm iodine, stir, clarify, and filter to produce iodine-containing dilute phosphoric acid to generate iodine-containing waste gas. The iodine-containing dilute phosphoric acid is introduced into the gas-liquid mixed extraction integrated iodine recovery device, and the iodine-containing waste gas is introduced into the device at the same time. First add chlorine gas to the iodine-containing dilute phosphoric acid, and under the action of the gas-liquid mixing separator inside the device, the iodine-containing gas and liquid are fully mixed, and the iodine in the acid enters the gas phase state. Then, the iodine-rich gas is introduced into the upper part of the recovery device through the inverted funnel device inside the gas-liquid mixed extraction integrated iodine recovery device, and the temperature is controlled at 33°C, and iodine is recovered with 5% sulfurous acid solution to obtain the iodine-containing clear ...

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Abstract

The invention discloses a gas-liquid mixed extraction iodine recovery technology. According to the invention, phosphate rock is soaked in sulfuric acid, and iodine-containing dilute phosphoric acid is obtained; an oxidizing agent is added into the dilute phosphoric acid, such that gas-phase iodine is obtained; the gas-phase iodine is subjected to a reaction with a reducing agent, such that iodine is precipitated. The invention is characterized in that: iodine-containing dilute phosphoric acid obtained by the reaction of phosphate rock and sulfuric acid and iodine-containing exhaust gas are simultaneously delivered into and sufficiently mixed in a gas-liquid mixed extraction integral iodine recovery apparatus; the oxidizing agent is added and a reaction is carried out, such that iodine molecules are obtained; the reducing agent is added under a condition of a controlled temperature, such that a concentrated iodine liquid is obtained; two-stage clarification, precipitation, filtration, and rectification purification are carried out, such that finished product iodine is obtained. The technology provided by the invention makes up for the defects of a method for extracting iodine from wastes produced in the process for producing phosphorus products from iodine-containing phosphorite. With the technology, iodine in iodine-containing dilute phosphoric acid and iodine-containing exhaust gas can be recovered simultaneously. Through two-stage clarification, defluoridation is realized, and floccule and impurities are removed, such that the purity of iodine is improved. The technology is also advantaged in simple technology, high recovery rate, and low economic cost. With the technology, iodine-containing exhaust gas can be fully utilized, and the pollution of tail-gas discharging to the environment can be reduced.

Description

technical field [0001] The invention relates to a gas-liquid mixed extraction iodine recovery process, which belongs to the technical field of chemical industry. Background technique [0002] Iodine is one of the scarce resources. Most of the phosphate rocks are associated with iodine oxides, the content is generally about 30ppm, and the iodine grade is low and the reserves are large. In long-term production, when the iodine-containing phosphate rock reacts with sulfuric acid, the iodine in the phosphate rock enters the liquid acid and gas produced by the reaction respectively. When the production is carried out by the dihydrate wet phosphoric acid process, 50% of the iodine in the phosphate rock enters the liquid acid, 30% of the iodine enters the reaction gas, and the rest enters the phosphogypsum (slag). When the semi-aqueous wet-process phosphoric acid process is used for production, 20% of the iodine in the phosphate rock enters the liquid acid, 70% of the iodine ente...

Claims

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Application Information

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IPC IPC(8): C01B7/14
Inventor 徐魁穆劲陈彬石永义赵先明喻茂廖吉星郑培俊杨俊杰廖川周勇张玉华
Owner GUIYANG KAILIN FERTILIZER CO LTD
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