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Technology for removing sodium out of industrial aluminium fluoride

An aluminum fluoride, industrial technology, applied in the field of industrial aluminum fluoride sodium removal, can solve the problems of reducing aluminum fluoride and not much research, and achieve the effects of reducing content, high added value, and preventing hydrolysis

Active Publication Date: 2015-03-18
LUOYANG FLUORIDE & POTASSIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there are not many studies on this aspect at present, there is no mature technology and method that can effectively reduce the sodium content in aluminum fluoride

Method used

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  • Technology for removing sodium out of industrial aluminium fluoride

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1 , the industrial aluminum fluoride sodium removal process of the present invention, its realization step is:

[0035] 1) First, the industrial aluminum fluoride is roasted at 200-400°C to transform it from α-type to β-type;

[0036] 2) Then add concentrated sulfuric acid according to the solid-to-liquid ratio of 1:10-20, stir and mix at room temperature to make it fully react, so that the sodium fluoroaluminate in it can be converted into soluble sodium sulfate and aluminum sulfate;

[0037] 3) Then add water to dilute, the amount of water added is 2 to 3 times the volume of concentrated sulfuric acid used, and filter to obtain a filter cake;

[0038] 4) Wash the filter cake with water;

[0039] 5) Dry the filter cake to obtain pure aluminum fluoride.

Embodiment 2

[0041] The difference between this example and Example 1 is that the preferred method is adopted. In step 1), industrial aluminum fluoride is roasted to completely convert it from α-type to β-type. The calcination temperature is controlled at 250-350°C, and the calcination time is Control between 1 ~ 2h.

Embodiment 3

[0043] The industrial aluminum fluoride sodium removal process of this embodiment differs from that of Embodiment 1 or Embodiment 2 in that: in the preferred method, in step 2), the concentration of concentrated sulfuric acid used is above 98%, and concentrated sulfuric acid is added According to the solid-liquid ratio of 1:10~12.

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Abstract

The invention relates to a method for removing sodium from industrial aluminum fluoride, aiming at reducing the sodium content in industrially produced aluminum fluoride. An industrial aluminum fluoride sodium removal process, 1) firstly roast industrial aluminum fluoride at 200-400°C to convert it from α-type to β-type; 2) then add it according to the solid-liquid ratio of 1:10-20 Concentrated sulfuric acid, stir and mix at room temperature to make it fully react, so that the sodium fluoroaluminate in it is converted into soluble sodium sulfate and aluminum sulfate; 3) Then add water to dilute, the amount of water added is 2-2% of the volume of concentrated sulfuric acid used 3 times, filter to obtain filter cake; 4) wash filter cake; 5) dry to obtain pure aluminum fluoride. The adoption of the industrial aluminum fluoride sodium removal process of the present invention can solve the problem of high content of sodium impurities in aluminum fluoride in the production process of using potassium feldspar to prepare aluminum fluoride, realize comprehensive utilization of potassium feldspar, and reduce waste of resources.

Description

technical field [0001] The invention relates to a method for removing sodium from industrial aluminum fluoride, aiming at reducing the sodium content in industrially produced aluminum fluoride. Background technique [0002] At present, there are many mature solutions for the production of aluminum fluoride in industry, such as: wet production process, dry production process, crude acid dry production process, etc. The aluminum fluoride produced by the reaction of refined hydrogen fluoride gas and aluminum hydroxide slurry has high purity raw materials and high purity aluminum fluoride, so there is no trouble of sodium ions. However, when aluminum fluoride is prepared by other processes, sodium ions will be more or less introduced due to the limitation of raw materials and processes, which will lead to a small amount of sodium ions in the prepared aluminum fluoride. The high content of sodium impurities in aluminum fluoride products (Na ≥ 2.8) will reduce the purity and grad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/50
Inventor 余福元张光旭崔文青张鲁鲁陈永革张晓会
Owner LUOYANG FLUORIDE & POTASSIUM TECH