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Method for removing fluorine in neutral or weakly acidic solution

A weak acid, solution technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problems of unsuitable industrial promotion and use, high price of adsorbents, etc. Simple and easy-to-control effects

Pending Publication Date: 2022-07-12
山西中鼎云铸科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing adsorbents are expensive and require frequent regeneration, so they are not suitable for industrial promotion and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for removing fluorine in a neutral or weakly acidic solution, comprising the following steps:

[0023] Step 1) Add 15 parts of zirconium oxychloride and 75 parts of titanium dioxide to 200 parts of concentrated sulfuric acid solution, stir for 10 hours, and use concentrated sulfuric acid to dissolve zirconium oxychloride and titanium dioxide;

[0024] Step 2) Under stirring again, add ammonia water to the mixed solution in step 1) to adjust the pH of the mixed solution to 10.5, and after adding ammonia water, the solution undergoes a co-precipitation reaction to obtain a composite precipitate of titanium and zirconium;

[0025] Step 3) washing the precipitate obtained in step 2) with deionized water;

[0026] Step 4) calcining the washed precipitate at a calcination temperature of 500°C, and grinding the calcined product to below 325 mesh for use;

[0027] Step 5) Adjust the solution to be removed from fluorine to neutral or weak acidity, and then add the grou...

Embodiment 2

[0030] A method for removing fluorine in a neutral or weakly acidic solution, comprising the following steps:

[0031] Step 1) Add 20 parts of zirconium oxychloride and 80 parts of titanium dioxide to 300 parts of concentrated sulfuric acid solution, stir for 12 hours, and use concentrated sulfuric acid to dissolve zirconium oxychloride and titanium dioxide;

[0032] Step 2) Under stirring again, add ammonia water to the mixed solution in step 1) to adjust the pH of the mixed solution to 10.5, and after adding ammonia water, the solution undergoes a co-precipitation reaction to obtain a composite precipitate of titanium and zirconium;

[0033] Step 3) washing the precipitate obtained in step 2) with deionized water;

[0034] Step 4) calcining the washed precipitate at a calcination temperature of 600°C, and grinding the calcined product to below 325 mesh for use;

[0035] Step 5) Adjust the solution to be removed from fluorine to neutrality or weak acidity, and then add the g...

Embodiment 3

[0038] A method for removing fluorine in a neutral or weakly acidic solution, comprising the following steps:

[0039] Step 1) Add 25 parts of zirconium oxychloride and 85 parts of titanium dioxide to 400 parts of concentrated sulfuric acid solution, stir for 15 hours, and use concentrated sulfuric acid to dissolve zirconium oxychloride and titanium dioxide;

[0040] Step 2) and then under stirring, add ammonia water to the mixed solution of step 1) to adjust the pH of the mixed solution to 11, and after adding ammonia water, the solution undergoes a co-precipitation reaction to obtain a composite precipitate of titanium and zirconium;

[0041] Step 3) washing the precipitate obtained in step 2) with deionized water;

[0042] Step 4) calcining the washed precipitate at a calcination temperature of 600°C, and grinding the calcined product to below 325 mesh for use;

[0043] Step 5) Adjust the solution to be removed from fluorine to neutral or weak acidity, and then add the gro...

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PUM

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Abstract

The invention provides a method for removing fluorine in a neutral or weakly acidic solution, which specifically comprises the following steps: firstly, adding zirconium oxychloride and titanium dioxide into a concentrated sulfuric acid solution, dissolving the zirconium oxychloride and the titanium dioxide by using concentrated sulfuric acid, and then adding ammonia water to adjust the pH value of the mixed solution to 10-11 to obtain a titanium-zirconium composite precipitate; and washing the precipitate with deionized water, roasting the washed precipitate at the roasting temperature of 400-700 DEG C, grinding the roasted product to 325 meshes or below for later use, thus completing the preparation of the fluorine removal agent of the titanium-zirconium compound, adding the ground titanium-zirconium compound into the solution, adjusting the pH value to be neutral or weakly acidic, heating the solution to about 30 DEG C, and stirring to obtain the fluorine removal agent of the titanium-zirconium compound. And removing oil and fluorine in the solution by using a titanium-zirconium compound.

Description

technical field [0001] The invention belongs to the field of fluorine-removing agents, and specifically relates to a method for removing fluorine in a neutral or weakly acidic solution. Background technique [0002] The removal of fluorine in solution is a major problem in several industries. For example, in the direct smelting technology of low-grade zinc oxide ore, the leaching and accumulation of impurity fluorine have caused serious harm to the subsequent purification and electrolysis processes. When the fluorine content is too high, the cathode zinc will be difficult to strip, the electrode consumption will increase, the anode will be eroded and the life will be increased, so the fluorine in the zinc sulfate electrolyte at home and abroad is required to be less than 50mg / L. [0003] Another example is that the number of lithium batteries used has doubled in recent years, and the number of lithium batteries that have been eliminated has also increased at the same time. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/40B01J20/02B01J20/30C02F101/14
CPCC02F1/281C02F1/40B01J20/0211C02F2101/14Y02W30/84
Inventor 赵宝平王建乔劲峰孙晓莎
Owner 山西中鼎云铸科技有限公司
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