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Phosphorus removal method for aluminun fluoride solution

A technology of aluminum fluoride and phosphorus aluminum fluoride, which is applied in the field of preparation of inorganic fluorides, can solve the problems of restricting the use of high phosphorus-containing fluorosilicic acid, the content of phosphorus in fluorosilicic acid varies, and the production cost is high, and the production cost is reached. Low, simplified process, easy to operate and control the effect

Active Publication Date: 2009-05-06
云南云天化氟化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no phosphorus removal measures have been taken in the above-mentioned preparation process for the by-product fluosilicic acid raw material of phosphate fertilizer. Due to different process conditions, the phosphorus content in the fluorosilicate varies, which limits the use of some high-phosphorus fluorosilicates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] a), fluorosilicic acid 15% (weight percentage), P 2 O 5 The concentration is 4250ppm, and the aluminum fluoride solution is obtained by reacting with aluminum hydroxide according to the existing method;

[0015] b) Add ferric chloride (FeCl 3 ), the ratio is Fe in ferric chloride and P in fluorosilicic acid 2 O 5 The molar ratio is 1:1, the stirrer is turned on, the temperature is 70°C, and the reaction is for 1 hour to form a mixture;

[0016] c) The above mixture is filtered and the precipitate is separated to obtain a qualified aluminum fluoride solution;

[0017] d) The above aluminum fluoride solution is used to prepare aluminum fluoride products by existing methods, and the P in the product is 2 O 5 The content is 0.021% (GB / T4292-2007 standard stipulates that P in aluminum fluoride products 2 O 5 The content is not more than 0.04%).

Embodiment 2

[0019] a), fluorosilicic acid 16% (weight percentage), P 2 O 5 The concentration is 2260ppm, and the aluminum fluoride solution is obtained by reacting with aluminum hydroxide according to the existing method;

[0020] b) Add polyferric chloride to the aluminum fluoride solution, the ratio is Fe in polyferric chloride and P in fluorosilicic acid 2 O 5 The molar ratio is 1:1.3, the stirrer is turned on, the temperature is 85°C, and the reaction is for 1 hour to form a mixture;

[0021] c) The above mixture is filtered and the precipitate is separated to obtain a qualified aluminum fluoride solution;

[0022] d) The above aluminum fluoride solution is used to prepare aluminum fluoride products by existing methods, and the P in the product is 2 O 5 The content is 0.025% (GB / T4292-2007 standard stipulates that P in aluminum fluoride products 2 O 5 The content is not more than 0.04%).

Embodiment 3

[0024] a), fluorosilicic acid 12% (weight percentage), P 2 O 5 The concentration is 7160ppm, and the aluminum fluoride solution is obtained by reacting with aluminum hydroxide according to the existing method;

[0025] b) Add polyferric sulfate to the aluminum fluoride solution, the ratio is Fe in polyferric sulfate and P in fluorosilicic acid 2 O 5 The molar ratio is 1:1.2, the stirrer is turned on, the temperature is 85°C, and the reaction is for 1 hour to form a mixture;

[0026] c) The above mixture is filtered and the precipitate is separated to obtain a qualified aluminum fluoride solution;

[0027] d). The above aluminum fluoride solution is used to prepare cryolite products by existing methods, and the product contains P 2 O 5 The content is 0.022% (GB / T4291-2007 standard stipulates that P in cryolite products 2 O 5 The content is not more than 0.03%).

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Abstract

The invention relates to a dephosphorization method of aluminum fluoride solution, P2O5 in the aluminum fluoride solution is reacted with a dephosphorization agent to prepare a product, and the method comprises the following steps: I. the aluminum fluoride solution containing phosphorus is selected; II. the aluminum fluoride solution containing the phosphorus is put in a reaction tank, steam is introduced, and the temperature is increased; III. slurry with the weight ratio of 1:1 is prepared by the dephosphorization agent and put in the reaction tank, the reaction time is 0.5h-1h, and mixture is generated by the reaction; and IV. the mixture is filtered, sediments are separated, and the qualified product is obtained; the dephosphorization method adopts the technical proposal of adopting P2O5 in the aluminum fluoride solution to be reacted with Fe in the dephosphorization agent so as to further prepare aluminum fluoride or cryolite and other fluoride products, thereby overcoming the shortcomings of single raw material, long technology flow, complicated process, strict requirements on phosphorus content in the fluosilicic acid raw material, and the like of the existing preparation method of the aluminum fluoride, the cryolite and other fluoride products. The dephosphorization method is applicable to the preparation of inorganic fluorides and especially applicable to the prepration of the aluminum fluoride or the cryolite and other fluoride products with the need of the treatment of the fluosilicic acid.

Description

Technical field [0001] The invention relates to the preparation of inorganic fluorides, in particular to a method for removing phosphorus from an aluminum fluoride solution. Background technique [0002] At present, the fluorine resources used to prepare aluminum fluoride or cryolite and other fluoride products mainly come from fluorite. Therefore, the contradiction between supply and demand of fluorite resources is prominent, and it is increasingly important to seek alternative resources for fluorite. The preparation of aluminum fluoride or cryolite and other fluoride products using fluorosilicic acid, a by-product of phosphate fertilizer, has become an important choice. However, the above-mentioned preparation process for selecting fluorosilicic acid as a by-product of phosphate fertilizer does not take phosphorus removal measures. The process flow is long, the process is complicated, and there are strict requirements on the phosphorus content in the fluorosilicic acid raw mate...

Claims

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Application Information

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IPC IPC(8): C01F7/50
Inventor 李飞跃廖志辉林高逵杨天兰朱崇高刘东晓段立山黎志坚
Owner 云南云天化氟化学有限公司
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