Novel process for removing metal ions in wet-process phosphoric acid

A technology of wet-process phosphoric acid and metal ions, applied in the direction of non-metallic elements, phosphorus compounds, chemical instruments and methods, etc., can solve the problems of complicated process, insufficient purification depth, difficult process, etc., and achieve simple process flow and improved exchange capacity Effect

Inactive Publication Date: 2010-04-07
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the anion SO in crude phosphoric acid 4 2- , F - 、SiF 2- etc. are not easy to remove, the concentration of the resulting refined acid is low, and a residue containing a large amount of impurities is generated (accounting for about 30%-50% of the material)
But its disadvantages are: the purification depth is not enough, and other ions are introduced at the same time, which brings new troubles to the deep purification, and all kinds of crystals have certain solubility, so that the final purification degree is limited, and must Perform multiple crystallization, the process is complicated, and it is not easy to process
However, electrodialysis also has its own disadvantages, such as concentration polarization and scaling during operation, and lower desalination rate compared with reverse osmosis.
[0013] Since the types of impurities in wet-process phosphoric acid are relatively complex, and the quality requirements of various phosphoric acid products are different, therefore, different methods should be selected according to the actual situation and the comprehensive technical and economic indicators for purification, and a single method generally cannot achieve The purpose of deep purification of wet-process phosphoric acid

Method used

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  • Novel process for removing metal ions in wet-process phosphoric acid
  • Novel process for removing metal ions in wet-process phosphoric acid
  • Novel process for removing metal ions in wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 50g polyacrylonitrile fiber is cut into the short fiber that length is 3cm, for subsequent use; Accurately weigh 120g sodium hydroxide solid, dissolve with the ethanol solution of 1700mL95% (mass) in beaker, then put the sodium hydroxide that is equipped with Put the ethanol aqueous solution container on the constant temperature water bath, add the short fiber into it, condense and reflux in the constant temperature water bath at 100°C, react for 6 hours, take out the fiber after cooling, and slowly stir the fiber with an appropriate amount of deionized water to make it swell , then use a Buchner funnel to filter it naturally, then rinse the filter cake with deionized water, and repeat this until the pH of the liquid flowing out from the bottom of the Buchner funnel is 8, and when there is no liquid flowing out from the bottom, a wet fiber is obtained; repeat the operation , make about 1000g polyacrylonitrile wet state ion exchange fiber standby.

[0028] Fill 650g poly...

Embodiment 2

[0036] Cut 50g of polyacrylonitrile fibers into short fibers with a length of 3cm for later use; accurately weigh 120g of sodium hydroxide solid, dissolve it in a beaker with 1700mL of 95% ethanol solution, and then put the configured sodium hydroxide ethanol solution container Put it on a constant temperature water bath, add short fibers into it, condense and reflux in a constant temperature water bath at 120°C, react for 5 hours, take out the fiber after cooling, slowly stir the fiber with an appropriate amount of deionized water to make it swell, and then use The Buchner funnel is allowed to filter naturally, and then the filter cake is washed with deionized water, and so on, until the pH of the liquid flowing out from the bottom of the Buchner funnel is 8, and the wet fiber is obtained when no liquid flows out from the bottom; repeated operations, obtained About 1000g polyacrylonitrile wet state ion exchange fiber is standby.

[0037] Fill 650g polyacrylonitrile wet ion-ex...

Embodiment 3

[0040] Cut 50g of polyacrylonitrile fibers into short fibers with a length of 0.3cm for later use; accurately weigh 120g of sodium hydroxide solid, dissolve it in a beaker with 1700mL of 95% ethanol solution, and then put the prepared sodium hydroxide ethanol solution Place the container on a constant temperature water bath, add short fibers into it, condense and reflux in a constant temperature water bath at 70°C, react for 8 hours, take out the fiber after cooling, slowly stir the fiber with an appropriate amount of deionized water to make it swell, and then Use a Buchner funnel to filter it naturally, then rinse the filter cake with deionized water, and repeat this until the pH of the liquid flowing out from the bottom of the Buchner funnel is 8, and when no liquid flows out from the bottom, a wet fiber is obtained; repeat the operation to prepare Get about 1000g polyacrylonitrile wet state ion exchange fiber for subsequent use.

[0041] Fill 650g polyacrylonitrile wet ion-...

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Abstract

The invention provides a novel process for removing metal ions in wet-process phosphoric acid. The process comprises the following steps: 1) adding alkaline partially-hydrolytic polyacrylonitrile fiber to deionized water, stirring, naturally filtering, washing a filter cake till the pH of liquid flowing out from the bottom of a Buchner funnel is 8 and obtaining exchange fiber of polyacrylonitrile ions and wet ions when no liquid flows out from the bottom; and 2) filling space between polypropylene cotton of a fiber filter and a cylindrical shell with the exchange fiber of polyacrylonitrile ions and wet ions, connecting a phosphoric-acid outlet pipe of an electrodialysis device with an inlet pipe of the fiber filter, allowing an outlet pipe of the fiber filter to enter a phosphoric-acid storage tank, pumping wet-process phosphoric acid into the electrodialysis device for circulation through a pump, allowing the wet-process phosphoric acid to pass through the electrodialysis device and operating the fiber filter and the electrodialysis device at the same time. The process has the advantages of simple process flow, low energy consumption, low production cost, little environmental pollution and high purification depth. In addition, the electrodialysis device used in the process is simple and easy to operate, low in energy consumption and low in cost needed.

Description

technical field [0001] The invention belongs to the field of fine chemical production, and specifically relates to a production process for removing metal ions in wet-process phosphoric acid by coupling polyacrylonitrile ion-exchange fibers with electrodialysis technology. The process combines electrodialysis and ion exchange. Advantages of purifying wet-process phosphoric acid. Background technique [0002] Phosphoric acid is an important basic chemical raw material, mainly used to manufacture high-efficiency phosphorus compound fertilizers, such as ammonium phosphate, triple superphosphate, potassium dihydrogen phosphate, etc. It is also a raw material for phosphorus-containing products such as feed additives, food additives, and industrial additives. , Widely used in chemical industry, metallurgy, petroleum, electronics, medicine, food and other fields. The preparation methods of phosphoric acid are divided into thermal phosphoric acid and wet phosphoric acid. Although ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/238
Inventor 陈金芳李玲周晶晶
Owner WUHAN INSTITUTE OF TECHNOLOGY
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