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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  • 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 reco

Method used

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Examples

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Example Embodiment

[0010] Example 1: A method for extracting iodine from wet-process phosphoric acid produced by iodine-containing phosphate ore by the semi-aqueous-dihydrate method. The concentration of iodine in concentrated phosphoric acid is 10 mg / L, and P in phosphoric acid 2 O 5 The mass percentage concentration of the product is 48%; for the acid in the product liquid phase, 1g of sodium hypochlorite is added to each 1000mL filtrate for oxidation, so that the ionic iodine becomes I 3- , And then enriched iodine 717 anion exchange resin exchange column with high multiples for adsorption, resin adsorption I 3- After that, use anhydrous sodium sulfite solution with a mass percentage of 5% 3- Reduce to I - , And then eluted with sodium hydroxide solution with a concentration of 3% by mass, and then precipitated the iodine with 2g potassium chlorate added to the acid. After filtration and centrifugal separation, 4.27mg of iodine was obtained after purification, and the product yield was 42.70%.

Example Embodiment

[0011] Example 2: A method for extracting iodine from wet-process phosphoric acid produced by the semi-aqueous-dihydrate method from iodine-containing phosphate rock. The concentration of iodine in concentrated phosphoric acid is 18 mg / L, and P in phosphoric acid 2 O 5 The mass percentage concentration of the product is 45%; for the acid in the product liquid phase, 3g of sodium hypochlorite is added to each 1000mL filtrate for oxidation, so that the ionic iodine becomes I 3- , And then through the exchange column equipped with 717 anion exchange resin with high enrichment of iodine, the resin adsorbs I 3- Then, use 5% anhydrous sodium sulfite solution with mass percentage concentration to 3- Reduce to I - , And then eluted with 3.5% sodium hydroxide solution, and then added 4g potassium chlorate in acid to precipitate iodine. After filtration and centrifugal separation, 9.89 mg of iodine was obtained after purification, and the product yield was 54.94%.

Example Embodiment

[0012] Example 3: A method for extracting iodine from wet-process phosphoric acid produced from iodine-containing phosphate ore by the semi-aqueous-dihydrate method. The concentration of iodine is 26 mg / L, and P in the acid 2 O 5 The mass percentage concentration is 43%. For the product liquid phase acid , Add 4g of sodium hypochlorite to every 1000mL filtrate for oxidation, so that the ionic iodine becomes I 3- , And then through the exchange column equipped with 717 anion exchange resin with high enrichment of iodine, the resin adsorbs I 3- After that, use anhydrous sodium sulfite solution with a mass percentage of 5% 3- Reduce to I - , And then eluted with sodium hydroxide solution with a concentration of 4% by mass, and then precipitated iodine with 6g potassium chlorate added to the acid. After filtration and separation, 15.25mg of iodine was refined, 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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