Preparation method of gamma-FeOOH

A reaction and green rust technology, applied in the field of desulfurization, can solve the problem of poor purity of γ-FeOOH, and achieve the effect of improving purity and yield, increasing contact area and high utilization rate

Inactive Publication Date: 2018-01-12
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the technical problem to be solved in the present invention is the defect that the purity of gamma-FeOOH produced by the existing gamma-FeOOH preparation process is relatively poor, and then a kind of preparation method of high-purity gamma-FeOOH is provided

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  • Preparation method of gamma-FeOOH

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Embodiment 1

[0039] This embodiment provides a method for preparing γ-FeOOH, comprising the following steps:

[0040] (1) Add 400mL of 1.5mol / L ammonium carbonate solution to 200mL of 1.5mol / L ferrous sulfate solution, control the reaction temperature to 0-5°C, and control the pH value at the end of the reaction to 6.0-6.3;

[0041] (2) carry out solid-liquid separation to the slurry obtained after step (1) reaction finishes, collect solid phase and liquid phase respectively, described solid phase is Luxiu intermediate, and described liquid phase evaporates to dryness and obtains ammonium sulfate;

[0042] (3) After the solid phase is washed with water to remove impurities, it is made into a slurry with a concentration of 10wt%, and 30wt% hydrogen peroxide is added to the slurry to undergo an oxidation reaction at 0-5°C, and the concentration of hydrogen peroxide and ferrous sulfate is controlled. The molar ratio is 1:2. After the reaction is completed, filter and dry the filter cake at 70...

Embodiment 2

[0046] This embodiment provides a method for preparing γ-FeOOH, comprising the following steps:

[0047] (1) Add 800mL of 1.5mol / L ammonium carbonate solution to 200mL of 1.5mol / L ferrous sulfate solution, control the reaction temperature to 0-5°C, and control the pH value at the end of the reaction to 6.2-6.5;

[0048] (2) carry out solid-liquid separation to the slurry obtained after step (1) reaction finishes, collect solid phase and liquid phase respectively, described solid phase is Luxiu intermediate, and described liquid phase evaporates to dryness and obtains ammonium sulfate;

[0049] (3) After the solid phase is washed with water to remove impurities, it is made into a slurry with a concentration of 20wt%, and 50wt% hydrogen peroxide is added to the slurry to undergo an oxidation reaction at 0 to 5°C, and the concentration of hydrogen peroxide and ferrous sulfate is controlled. The molar ratio is 1:2. After the reaction is completed, filter and dry the filter cake at 6...

Embodiment 3

[0052] This embodiment provides a method for preparing γ-FeOOH, comprising the following steps:

[0053] (1) Add 600mL of 1.5mol / L ammonium bicarbonate solution to 200mL of 1.5mol / L ferrous sulfate solution, control the reaction temperature to 0-5°C, and control the pH value at the end of the reaction to 6.2-6.5;

[0054] (2) carry out solid-liquid separation to the slurry obtained after step (1) reaction finishes, collect solid phase and liquid phase respectively, described solid phase is Luxiu intermediate, and described liquid phase evaporates to dryness and obtains ammonium sulfate;

[0055] (3) After the solid phase is washed with water to remove impurities, it is made into a slurry with a concentration of 15wt%, and 40wt% hydrogen peroxide is added to the slurry to undergo an oxidation reaction at 0 to 5°C, and the concentration of hydrogen peroxide and ferrous sulfate is controlled. The molar ratio is 1.1:2. After the reaction is completed, filter and dry the filter cak...

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Abstract

The invention belongs to the technical field of sulfur removal and discloses a preparation method of gamma-FeOOH. The method comprises the following steps: enabling green rust to react with an oxidizing agent at 0-10 DEG C, wherein gamma-FeOOH is obtained after the reaction is over. According to the preparation method disclosed by the invention, the gamma-FeOOH having purity of 98% or more can beprepared by oxidizing the green rust at low temperature (0-10 DEG C); this is because the oxidizing reaction is an exothermic reaction, the low-temperature condition is helpful to dissipate heat in time, thus the generation of FeOOH of other crystal phases or other oxide crystal phases of iron is effectively avoided, and the purity and yield of the gamma-FeOOH are remarkably improved. Moreover, hydrogen peroxide is adopted as the oxidizing agent, and the prepared gamma-FeOOH has relatively large specific surface area and relatively strong absorbability and can be widely applied to the field ofsulfur removal.

Description

technical field [0001] The invention belongs to the technical field of desulfurization, and in particular relates to a preparation method of γ-FeOOH. Background technique [0002] Iron oxyhydroxide (FeOOH) has a very wide range of application values, and can be used as a precursor of pigments, magnetic coatings, magnetic recording media, gas sensors, desulfurizers, ozonolysis catalysts, heavy metal removers, etc., thus prompting more and more The research is dedicated to the production process of iron oxyhydroxide. It has been found through research that there is a close relationship between the structure and properties of iron oxyhydroxide and its preparation methods, and different preparation methods will yield iron oxyhydroxides with different crystal forms, morphologies and characteristics. [0003] Lepidotite (γ-FeOOH) is a hydroxide in the form of γ, which represents most iron oxides. Because it is metastable, it has high activity and is the best performance among all...

Claims

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Application Information

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IPC IPC(8): C01G49/02C01C1/244C05C3/00
Inventor 王立贤樊俐王鲁璐崔永君
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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