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A kind of preparation method of znfe-ldhs/diatomite composite material

A technology of composite materials and diatomite, applied in chemical instruments and methods, improvement of process efficiency, other chemical processes, etc., can solve the problem of diatomite attachment vacancy occupation, reduction of diatomite surface area, low fluorine adsorption capacity, etc. problems, achieve the effect of eliminating structural water and non-bridging hydroxyl groups, improving fluorine adsorption capacity, and high fluorine adsorption capacity

Active Publication Date: 2022-07-08
ZIJIN MINING GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are a lot of impurities attached to the internal structure of ordinary diatomite, which makes the attachment vacancies of diatomite occupied, reduces the surface area of ​​diatomite, and prevents fluorine ions from entering its structure, resulting in low fluorine adsorption capacity, which limits Application of Diatomite in Fluorine Adsorption

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  • A kind of preparation method of znfe-ldhs/diatomite composite material

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Embodiment 1

[0026] The present embodiment provides a preparation method of ZnFe-LDHs / diatomite composite material, and the specific process is:

[0027] (1) Place diatomite in a beaker and add sulfuric acid solution, stir for 4h under the conditions of liquid-solid ratio (volume / mass) 4:1, solution temperature 40°C, and sulfuric acid concentration 0.5mol / L, and filter to obtain The diatomite was washed with water until the washing water became neutral, and then air-dried to constant weight.

[0028] (2) The acidified diatomite was calcined at a calcination temperature of 350° C. for 2 h to obtain calcined activated diatomite.

[0029] (3) using zinc nitrate and ferric nitrate to prepare a mixed solution of zinc and iron, the mass concentrations of zinc nitrate and ferric nitrate are 4% and 2% respectively.

[0030] (4) the activated diatomite is placed in the container containing the zinc-iron mixed solution according to the solid-liquid ratio (mass / volume) 1:100, and the pH is adjusted ...

Embodiment 2

[0033] The present embodiment provides a preparation method of ZnFe-LDHs / diatomite composite material, and the specific process is:

[0034] (1) Acidification modification Put diatomite in a beaker and add sulfuric acid solution, stir for 4 hours under the conditions of liquid-solid ratio (volume / mass) 10:1, solution temperature 70 °C, and sulfuric acid concentration 1.1 mol / L, filter , the obtained diatomite is washed with water until the washing water is neutral, and then air-dried to constant weight.

[0035] (2) calcining the acidified diatomite at a calcination temperature of 550° C. for 3 hours to obtain calcined activated diatomite.

[0036] (3) using zinc acetate and ferric sulfate to prepare zinc-iron solution, the mass concentrations of zinc acetate and ferric sulfate are 6% and 2.5% respectively.

[0037] (4) The activated diatomite is placed in the container containing the zinc-iron mixed solution according to the solid-liquid ratio (mass / volume) 1:50, and the pH ...

Embodiment 3

[0040] The present embodiment provides a preparation method of ZnFe-LDHs / diatomite composite material, and the specific process is:

[0041] (1) Place diatomite in a beaker and add sulfuric acid solution, stir for 6 h under the conditions of liquid-solid ratio (volume / mass) 8:1, solution temperature 60 °C, and sulfuric acid concentration 0.3 mol / L, and filter to obtain The diatomite was washed with water until the washing water became neutral, and then air-dried to constant weight.

[0042](2) The acidified diatomite was activated at a microwave frequency of 4000 MHz for 25 min to obtain microwave-activated diatomite.

[0043] (3) The zinc-iron solution is prepared by using zinc sulfate and iron nitrate, and the mass concentrations of zinc sulfate and iron nitrate are 0.8% and 0.4%, respectively.

[0044] (4) the diatomite after activation modification is placed in the container that is housed with the zinc-iron mixed solution according to the solid-liquid ratio (mass / volume)...

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Abstract

The invention discloses a preparation method of a ZnFe-LDHs / diatomite composite material. The diatomite is activated and modified by means of acid activation + calcination activation / microwave activation to remove bound water and sodium in the diatomite. , potassium and other impurities, which increase the pores and specific surface area of ​​diatomite. The modified diatomite has a rich pore structure. Attaching ZnFe-LDHs to the surface and macropores of diatomite can make the material The fluorine adsorption capacity is greatly improved; in addition, the surface modification of the obtained composite material with anionic surfactants eliminates the structural water and non-bridging hydroxyl groups between the ZnFe-LDHs layers, enhances the steric hindrance between the particles, and prevents the Lap to improve the adsorption performance of fluorine. In the prepared composite material, ZnFe-LDHs was attached to the surface of diatomite and in the coarse pores, and the pore structure of diatomite was completely preserved. The fluorine adsorption capacity of the overall material is improved, and the problem of difficult filtration of pure ZnFe-LDHs is solved.

Description

technical field [0001] The invention relates to the technical field of zinc hydrometallurgy, in particular to a preparation method of a ZnFe-LDHs / diatomite composite material. Background technique [0002] With the continuous mining of mineral resources, zinc ore tends to be lean, fine, and miscellaneous, resulting in low grade zinc concentrate produced by flotation and high impurity content, especially the higher and higher fluorine content. In the process of zinc smelting, excessive fluoride ion concentration in the electrolyte will corrode the cathode aluminum plate, destroy the passivation film on the cathode plate, lead to the adhesion of the precipitated zinc and the aluminum plate, make it difficult to strip zinc, increase the consumption of the cathode plate, and make the electrolysis process unable to proceed normally. . In addition, fluorine will accelerate the corrosion of steel components, increase the loss of equipment such as pumps and mixers, and increase pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/14B01J20/30C25C1/16C25C7/02
CPCB01J20/14B01J20/06C25C1/16C25C7/02B01J2220/4806B01J2220/42Y02P10/20
Inventor 林泓富吴星琳衷水平陈杭王俊娥张恒星石瑀
Owner ZIJIN MINING GROUP
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