Method for extracting iodine from wet-process phosphoric acid produced from iodine-containing phosphorous ore by semi-water and bi-water method

A wet process phosphoric acid, dihydrate wet process technology, applied in the directions of iodine/hydrogen iodide, iodine, etc., can solve the problems of iodine loss, no mention of iodine extraction, etc., and achieve the effects of fast exchange speed, simple operation and obvious effect.

Inactive Publication Date: 2012-06-20
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101323434A "A method for recovering iodine from concentrated phosphoric acid produced by wet-process phosphoric acid" is to extract iodine after dilute phosphoric acid is concentrated into concentrated phosphoric acid. Although the concentration of iodine is increased, part of the iodine is also lost. and patent CN101318625B "a kind of method for recovering points from dilute phosphoric acid produced by wet-process phosphoric acid" and patent CN101323435A "method for extracting iodine from fluorine-containing silicic acid" are all aimed at dihydrate wet-process phosphoric acid process or its Iodine is extracted from by-products, but there is no mention of how to extract iodine from the hemihydrate-dihydrate process

Method used

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Examples

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Effect test

Embodiment 1

[0010] Example 1: The method for extracting iodine from the wet-process phosphoric acid produced by the semi-water-dihydrate method from the iodine-containing phosphorus rock, the concentration of iodine in the concentrated phosphoric acid is 10mg / L, and the P in the phosphoric acid 2 o 5 The mass percentage concentration is 48%; For the acid in the product liquid phase, add sodium hypochlorite 1g in every 1000mL filtrate and carry out oxidation, make ion iodine become I 3- , then enriched by loading iodine The exchange column of 717 anion exchange resin with high multiple is adsorbed, and the resin adsorption I 3- Afterwards, be that 5% anhydrous sodium sulfite solution puts I with mass percentage concentration 3- Revert to I - , and then eluted with 3% sodium hydroxide solution by mass percentage, then precipitated iodine with 2g of potassium chlorate added to the acid, filtered and centrifuged, refined to obtain 4.27mg of iodine, and the product yield was 42.70%.

Embodiment 2

[0011] Example 2: The method for extracting iodine from the wet-process phosphoric acid produced by the semi-water-dihydrate method from the iodine-containing phosphoric rock, the concentration of iodine in the concentrated phosphoric acid is 18mg / L, and the P in the phosphoric acid 2 o 5 The mass percentage concentration is 45%; For the acid in the product liquid phase, add sodium hypochlorite 3g and carry out oxidation in every 1000mL filtrate, make ion iodine become I 3- , and then adsorbed by an exchange column equipped with 717 anion-exchange resin with high iodine-enrichment multiple, the resin adsorption I 3- Afterwards, be that 5% anhydrous sodium sulfite solution puts I with mass percentage concentration 3- Revert to I - , and then eluted with 3.5% sodium hydroxide solution, then precipitated iodine with 4g of potassium chlorate added to the acid, filtered and centrifuged, refined to obtain 9.89 mg of iodine, and the product yield was 54.94%.

Embodiment 3

[0012] Embodiment 3: The method for extracting iodine from the wet-process phosphoric acid produced by the semi-water-dihydrate method of iodine-containing phosphate rock, the concentration of iodine is 26mg / L, and the P in the acid 2 o 5 The mass percentage concentration is 43%. for the product in the liquid phase acid , in every 1000mL filtrate, add sodium hypochlorite 4g and carry out oxidation, make ion iodine become I 3- , and then adsorbed by an exchange column equipped with 717 anion-exchange resin with high iodine-enrichment multiple, the resin adsorption I 3- Afterwards, be that 5% anhydrous sodium sulfite solution puts I with mass percentage concentration 3- Revert to I - , and then eluted with 4% sodium hydroxide solution with a mass percentage concentration, then precipitated iodine with 6g of potassium chlorate added to the acid, filtered and separated, refined to obtain 15.25 mg of iodine, and the product yield was 58.65%.

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Abstract

The invention discloses a method for extracting iodine from wet-process phosphoric acid produced from an iodine-containing phosphorous ore by a semi-water and bi-water method. In the process of extracting the iodine, the concentration of the iodine is 10 to 50mg / L, the phosphoric acid comprises 40 to 48 mass percent of P2O5, and the iodine is extracted by 717 anion exchange resin which has extremely high iodine ion adsorption capacity. The method comprises the following steps of enriching the iodine in the phosphoric acid; eluting; analyzing the iodine; and extracting the iodine. By the method, the used 717 anion exchange resin has high iodine enriching magnification and a high exchange speed, is easy to elute and operate, can be recycled, and reduces production cost; a selected oxidant sodium hypochlorite can easily control oxidation degrees and has an obvious effect; the method has a simple process, and a product from which the iodine is extracted has high quality and high yield; and the recovery rates of resources are improved.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a method for extracting iodine from wet-process phosphoric acid produced by iodine-containing phosphorus ore by a semi-hydrate-dihydrate method, and extracting iodine from downstream products of iodine-containing phosphorus ore, which belongs to the comprehensive utilization of raw materials Aspect technology has environmental protection effect. Background technique [0002] Iodine is one of the essential trace elements in the human body, and it plays an extremely important role in the physiology of the human body; at the same time, iodine is the basic raw material for the manufacture of inorganic or organic iodides, and is essential for the manufacture of various iodine preparations, disinfectants and pesticides With few raw materials, it is widely used in national defense and cutting-edge technology in modern military industry. [0003] my country is an iod...

Claims

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Application Information

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IPC IPC(8): C01B7/14
Inventor 何浩明解田史春英胡宏贾双珠田言杨丽萍
Owner WENGFU (GRP) CO LTD
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