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Method for reducing metal ions in raffinate acid

A technology of metal ions and raffinate, applied in the direction of non-metallic elements, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of single impurity removal, cumbersome process, limited impurity content, etc., and achieve a wide range of purification and good purification effect Effect

Pending Publication Date: 2019-11-22
YIDU XINGFA CHEM COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The existing solvent precipitation method for treating phosphoric acid has relatively simple conditions, limited impurity content, single impurity removal, and cumbersome process, so it cannot be applied to the purification of raffinate acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Take 100g of raffinate stock solution, heat it in a constant temperature water bath at 55°C, and add 8g of mixed solution to it after the temperature rises to the set temperature. The molar ratio of ammonia water to fluorosilicic acid in the mixed solution is 5 : 1, stirring fully to react for 2h, then standing for 24h, the upper layer is raffinate clear liquid.

[0026] Al in raffinate stock solution 2 o 3 The content is 3.35%, Fe 2 o 3 The MgO content is 0.45%, and the MgO content is 3.35%. The conversion index of the obtained raffinate clear liquid is Al 2 o 3 Content 1.70%, Fe 2 o 3 The content of MgO is 0.36%, the MgO content is 2.15%, and the corresponding ion removal rates are 50%, 20%, and 35%, respectively.

Embodiment 2

[0027] Example 2: Take 100g of the raffinate stock solution and place it in a constant temperature water bath at 60°C for heating. After the temperature rises to the set temperature, add 6g of sodium fluoride to it, and the molar ratio of ammonia water to fluorosilicate in the mixed solution is 6:1, stir fully and react for 2 hours, then let it stand for 24 hours, the upper layer is raffinate clear liquid.

[0028] Al in raffinate stock solution 2 o 3 The content is 3.35%, Fe 2 o 3 The MgO content is 0.45%, and the MgO content is 3.35%. The conversion index of the obtained raffinate clear liquid is Al 2 o 3 Content 1.93%, Fe 2 o 3 The content of MgO is 0.36%, and the MgO content is 2.4%. The corresponding ion removal rates are 42%, 20%, and 28%, respectively.

Embodiment 3

[0029] Example 3: Take 100g of raffinate stock solution, place it in a constant temperature water bath at 50°C and heat it. After the temperature rises to the set temperature, add 10g of hydrogen fluoride to it, and the molar ratio of ammonia water to fluorosilicic acid in the mixed solution is 7: 1. Stir to fully react for 2 hours, then let it stand for 24 hours, the upper layer is raffinate clear liquid.

[0030] Al in raffinate stock solution 2 o 3 The content is 3.35%, Fe 2 o 3 The MgO content is 0.45%, and the MgO content is 3.35%. The conversion index of the obtained raffinate clear liquid is Al 2 o 3 Content 1.90%, Fe 2 o 3 content of 0.34%, and MgO content of 2.2%, the corresponding ion removal rates are 43%, 24%, and 34%, respectively.

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PUM

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Abstract

The invention discloses a method for reducing the metal ions in the raffinate acid, which is characterized by comprising the following steps of putting the raffinate acid into a constant-temperature water bath kettle, heating to 40-70 DEG C, adding a mixture of the ammonia water and a fluorine-containing compound, stirring to react for 1-4 hours, standing for 12-36 hours, and filtering to obtain the clear liquid, namely the raffinate acid. The method is simple in process and is easy to operate, an original device does not need to be modified, and the method is an effective and feasible methodfor reducing the aluminum ions in the raffinate acid. The magnesium and aluminum ions of the raffinate acid processed by the method of the present invention are removed better, wherein the removal rate of the magnesium ions can reach 20-49%, and the removal rate of the aluminum ions can reach 30-54%.

Description

technical field [0001] The invention relates to a new method for reducing metal ions in raffinate acid, which belongs to the field of wet-process phosphoric acid purification. Background technique [0002] Phosphoric acid is an important chemical raw material for daily necessities and industrial production. It can be used to produce phosphate fertilizers, feed nutrients, food additives, etc. Phosphoric acid plays a very important role in human activities. The methods for producing phosphoric acid mainly include thermal and wet processes, but the thermal process has obvious defects, such as high energy consumption and serious environmental pollution, and the energy consumption is about three times that of the wet process. With the rapid development of society, the energy crisis has become more and more prominent, and the advantages of the low-energy wet-process phosphoric acid production process have gradually emerged, and gradually replaced the high-energy, polluting thermal...

Claims

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Application Information

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IPC IPC(8): C01B25/238
CPCC01B25/238
Inventor 刘兵兵郑光明邹学勇沈维云刘鑫李防刘连坤孙桦林陈慧刘海方
Owner YIDU XINGFA CHEM COMPANY
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