Method for deeply purifying iodine recycled from wet-process phosphoric acid and fluosilicic acid

A wet-process phosphoric acid, deep purification technology, applied in iodine/hydrogen iodide, iodine and other directions, can solve the problems of large iodine loss, complex production process, high cost, avoid waste of resources, solve complex production process, and widen economic benefits. and social benefits

Inactive Publication Date: 2018-05-15
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the previous iodine recovery technology is limited to the production of crude iodine, and the product contains high impurities, which cannot be directly used in the production of iodine-containing intermediates in food and medicine.
At present, the deep purification of crude iodine needs to be carried out by sublimation method, melting method, etc. The production process is complex, the cost is high, and the loss of iodine is relatively large

Method used

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  • Method for deeply purifying iodine recycled from wet-process phosphoric acid and fluosilicic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Purification and purification process of iodine recovery in wet-process phosphoric acid: a phosphoric acid workshop of Kailin Group uses about 60% of the associated iodine resources in phosphate rock into dilute phosphoric acid, which contains about 40mg / kg of iodine, expressed as H 2 o 2 As an oxidizing agent, iodide ions in wet-process phosphoric acid are oxidized into iodine molecules, and then the iodine molecules are blown off in the gas phase by air extraction, and then the iodine molecules in the gas phase are washed, absorbed and enriched by a reducing agent cycle. When the concentration of iodine ions in the absorption liquid After reaching 50g / L, iodine is purified and refined to obtain iodine products.

[0034] The recovery and purification process of iodine from wet-process phosphoric acid is as follows: figure 1 shown. Through the iodine absorption liquid circulation pump, the absorption liquid containing 50g / L iodine ion from the absorption liquid circul...

Embodiment 2

[0036] Purification and purification process of iodine recovery in wet-process phosphoric acid: a phosphoric acid workshop of Kailin Group uses about 60% of the associated iodine resources in phosphate rock into dilute phosphoric acid, which contains about 40mg / kg of iodine, expressed as H 2 o 2 As an oxidizing agent, iodide ions in wet-process phosphoric acid are oxidized into iodine molecules, and then the iodine molecules are blown off in the gas phase by air extraction, and then the iodine molecules in the gas phase are washed, absorbed and enriched by a reducing agent cycle. When the concentration of iodine ions in the absorption liquid After reaching 40g / L, carry out iodine purification and refinement and obtain iodine product.

[0037] The recovery and purification process of iodine from wet-process phosphoric acid is as follows: figure 1 shown. Through the iodine absorption liquid circulation pump, the absorption liquid containing 40g / L iodine ion from the absorption...

Embodiment 3

[0039] Purification and purification process of iodine recovery in wet-process phosphoric acid: a phosphoric acid workshop of Kailin Group uses about 60% of the associated iodine resources in phosphate rock into dilute phosphoric acid, which contains about 40mg / kg of iodine, expressed as H 2 o 2 As an oxidizing agent, iodide ions in wet-process phosphoric acid are oxidized into iodine molecules, and then the iodine molecules are blown off in the gas phase by air extraction, and then the iodine molecules in the gas phase are washed, absorbed and enriched by a reducing agent cycle. When the concentration of iodine ions in the absorption liquid After reaching 10g / L, carry out iodine purification and refinement to obtain iodine product.

[0040] The recovery and purification process of iodine from wet-process phosphoric acid is as follows: figure 1 shown. The absorption liquid containing 10g / L iodine ion from the absorption liquid circulation tank 5 enters the first-stage purifi...

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Abstract

The invention discloses a method for deeply purifying iodine recycled from wet-process phosphoric acid and fluosilicic acid. The method includes: using H2O2 as an oxidant to oxidize iodine ions in wet-process phosphoric acid and fluosilicic acid into iodine molecules; adopting an air extraction method to blow off the iodine molecules as a gaseous phase, and circularly washing, and absorbing and enriching the iodine molecules in the gaseous phase through a reductant; when concentration of the iodine ions in absorbing liquid reaches 10-50g / L, performing iodine purifying, wherein iodine purifyingincludes adding calcium carbonate into the absorbing liquid for primary purifying, adding aluminum salt for secondary purifying, adding hydrogen peroxide to oxidize and separate iodine out, filtering, using concentrated sulfuric acid for purifying again, and filtering to obtain refined iodine. By the method, iodine resources are fully recycled, so that resource waste is avoided; iodine prepared by the method is high in purity, few in impurity and good in economic benefit.

Description

technical field [0001] The invention belongs to the field of iodine purification and recovery, and in particular relates to a deep purification method for recovering iodine from wet-process phosphoric acid and fluosilicic acid. Background technique [0002] Iodine is known as the element of life and wisdom. It is an indispensable element for the growth of plants and human body. It is the main raw material for the manufacture of inorganic or organic iodides and a good catalyst for many chemical reactions. Iodine chemical products are widely used in food, medicine, dyes, metallurgy, synthetic rubber, agriculture, national defense cutting-edge technology and many other industries. Global iodine demand is growing stronger. Iodine is a scarce resource. The iodine ore resources in the world mainly include Chilean saltpeter, seaweed and underground brine. With the depletion of iodine ore resources that are easy to exploit and utilize, the price of iodine continues to rise. At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/14
CPCC01B7/14C01P2006/80C01P2006/82
Inventor 项双龙吴有丽廖吉星张伟蒋学华张文唐丽君韩朝应何花王采艳周宾张卫红杨昌勇潘礼富张迅
Owner GUIYANG KAILIN FERTILIZER CO LTD
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