Defluorination material for zinc sulfate solution and preparing method

A technology of zinc sulfate solution and fluorine material, applied in separation methods, chemical instruments and methods, filter regeneration, etc., can solve the problems of loss of loaded active components, difficult disposal of filter residues, complicated preparation process, etc., and achieve good economic benefits, The effect of removing F is beneficial and the preparation process is simple

Inactive Publication Date: 2016-12-07
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this material is complicated, and the cost is too high due to the large amount of rare earth salt; and the bamboo charcoal is light, and it is not easy to fully contact with the solution during the material preparation and adsorption process, resulting in difficult operation; The process of filtering, washing and then lye treatment can easily lead to the loss of loaded active components
[0004] Using the current adsorbent materials for zinc sulfate solution to remove fluoride, there are problems such as small adsorption capacity, low fluoride removal rate, low selectivity to fluoride ions, and high zinc loss, which lead to large amounts of adsorbents and difficulties in subsequent filter residue treatment, resulting in enterprises Increased costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) First put 1 kg of aluminum hydroxide powder with a particle size of 150 mesh according to the solid-to-liquid ratio of 1:4, put 4 L of ferric sulfate and 0.3 mol / L magnesium sulfate mixed solution with a concentration of 0.3 mol / L, fully stir and mix;

[0043] (2) Heat the mixed solution in step (1) to 40°C, stir at a rotating speed of 80r / min, add ammonia water to adjust the pH to 9.2, let stand for 8h, and filter with suction;

[0044] (3) Add the obtained sample into 0.05mol / L lanthanum nitrate solution at a solid-to-liquid ratio of 1:4, repeat the operation steps of step (2), and dry the filtered sample at 105°C for 3 hours;

[0045] (4) Place the dried sample into a high-temperature resistance furnace, control the temperature rise rate to 4°C / min, and at the same time pass nitrogen gas at a rate of 0.4L / min, raise the temperature to 350°C, and bake at this temperature for 3h. After being down to room temperature, obtain the fluorine-removing material for zinc s...

Embodiment 2

[0060] (1) First put 1 kg of aluminum hydroxide powder with a particle size of 230 mesh according to a solid-to-liquid ratio of 1:5, put 5 L of ferric sulfate and 1.2 mol / L of magnesium sulfate mixed solution with a concentration of 1 mol / L, fully stir and mix;

[0061] (2) Heating the mixed solution in step (1) to 60° C., stirring at a rotation speed of 120 r / min, adding ammonia water to adjust the pH to 9.5, standing for 12 hours, and suction filtration;

[0062] (3) Add the obtained sample into 0.1mol / L lanthanum nitrate solution according to the solid-to-liquid ratio of 1:5, repeat the operation steps of step (2), and dry the filtered sample at 120°C for 4 hours;

[0063] (4) Put the dried sample into a high-temperature resistance furnace, control the temperature rise rate to 6°C / min, and at the same time pass nitrogen gas at a rate of 0.6L / min, raise the temperature to 400°C, and roast at this temperature for 4h, After cooling down to room temperature, obtain the fluorine...

Embodiment 3

[0066] (1) First put 1 kg of aluminum hydroxide powder with a particle size of 250 mesh according to the solid-to-liquid ratio of 1:7, put 7 L of ferric sulfate and 2.5 mol / L of magnesium chloride mixed solution with a concentration of 2.1 mol / L, fully stir and mix;

[0067] (2) Heating the mixed solution in step (1) to 60° C., stirring at a rotating speed of 140 r / min, adding potassium carbonate to adjust the pH to 10, standing for 14 hours, and suction filtration;

[0068] (3) Add the obtained sample into 0.15mol / L lanthanum nitrate solution according to the solid-to-liquid ratio of 1:7, repeat the operation steps of step (2), and dry the filtered sample at 120°C for 4 hours;

[0069] (3) Put the dried sample into a high-temperature resistance furnace, control the temperature rise rate to 8°C / min, and at the same time pass nitrogen gas at a rate of 0.6L / min, raise the temperature to 450°C, and roast at this temperature for 3h, After being lowered to room temperature, obtain ...

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Abstract

The invention discloses a defluorination material for a zinc sulfate solution in the zinc smelting process and a preparing method. The defluorination material is mainly prepared from oxide containing aluminum elements, rare earth elements, iron elements and magnesium elements. The preparing method includes the steps that aluminum hydroxide powder is placed into iron-magnesium salt mixed liquid, the mixture is stirred, alkaline is added to adjust pH, and the obtained mixture stands and is subjected to suction filtration; the obtained sample is added into a rare earth salt solution, the mixture is stirred again, alkaline is added to adjust pH, and the obtained mixture is subjected to suction filtration and dried; finally, the obtained product is placed into a high-temperature resistance furnace and roasted under the ventilation condition, and the defluorination material is obtained. The preparing method is simple, and the product is stable in nature, has high selective adsorbability and high adsorbing capacity for high-concentration fluorinion in the zinc sulfate solution and can be recycled with a simple method. When the material is applied to removing the high-concentration fluorinion in the zinc sulfate solution, the concentration of F in the solution can be effectively and rapidly reduced, the enterprise cost can be reduced, and environment pollution can be reduced. The material is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to a material for purifying zinc sulfate solution in a zinc smelting process and a preparation method thereof, in particular to a material for removing fluorine from zinc sulfate solution and a preparation method thereof. technical background [0002] Too high fluorine concentration in the zinc sulfate electrowinning solution for zinc smelting will seriously affect the zinc electrowinning process: fluorine ions will destroy the oxide film on the surface of the cathode aluminum plate and increase the consumption of the electrode plate; it will cause a gap between the precipitated zinc and the cathode aluminum plate. Alloy, bonding phenomenon occurs, affecting the quality of electrolytic zinc; in addition, the high fluorine concentration in the zinc sulfate solution will also cause difficulty in cathode zinc stripping, increase costs, reduce production efficiency, and seriously affect the normal production of enterprises. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30B01J20/34B01D15/08
CPCB01D15/08B01J20/0229B01J20/041B01J20/08B01J20/3433B01J20/3475
Inventor 田忠良郭伟昌罗永光孙斯景杨凯赖延清
Owner CENT SOUTH UNIV
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