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

AI Technical Summary

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

Method used

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  • Preparation method of gamma-FeOOH
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  • Preparation method of gamma-FeOOH

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Example Embodiment

[0038] Example 1

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

[0040] (1) the ammonium carbonate solution of 400mL 1.5mol / L is joined in the ferrous sulfate solution of 200mL 1.5mol / L, the control reaction temperature is 0~5 ℃, and the pH value of the reaction end point is controlled to be 6.0~6.3;

[0041] (2) solid-liquid separation is carried out to the slurry obtained after the reaction in step (1), the solid phase and the liquid phase are collected respectively, and the solid phase is a green embroidery intermediate, and the liquid phase is evaporated to dryness to obtain ammonium sulfate;

[0042] (3) Wash the solid phase with water to remove impurities and prepare a slurry with a concentration of 10 wt %, add 30 wt % of hydrogen peroxide to the slurry to undergo oxidation reaction at 0 to 5 ° C, and control the hydrogen peroxide and ferrous sulfate. The molar ratio was 1:2. After the reaction was completed, t...

Example Embodiment

[0045] Example 2

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

[0047] (1) 800mL 1.5mol / L ammonium carbonate solution was added to 200mL1.5mol / L ferrous sulfate solution, and the control reaction temperature was 0~5 ℃, and the pH value of the reaction end point was controlled to be 6.2~6.5;

[0048] (2) solid-liquid separation is carried out to the slurry obtained after the reaction in step (1), the solid phase and the liquid phase are collected respectively, and the solid phase is a green embroidery intermediate, and the liquid phase is evaporated to dryness to obtain ammonium sulfate;

[0049] (3) Wash the solid phase with water to remove impurities and prepare a slurry with a concentration of 20 wt %, add 50 wt % of hydrogen peroxide to the slurry to undergo oxidation reaction at 0 to 5 ° C, and control the hydrogen peroxide and ferrous sulfate. The molar ratio is 1:2, and after the reaction is completed, the filter...

Example Embodiment

[0051] Example 3

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

[0053] (1) the ammonium bicarbonate solution of 600mL 1.5mol / L is joined in the ferrous sulfate solution of 200mL 1.5mol / L, the control reaction temperature is 0~5 ℃, and the pH value of the reaction end point is controlled to be 6.2~6.5;

[0054] (2) solid-liquid separation is carried out to the slurry obtained after the reaction in step (1), the solid phase and the liquid phase are collected respectively, and the solid phase is a green embroidery intermediate, and the liquid phase is evaporated to dryness to obtain ammonium sulfate;

[0055] (3) Wash the solid phase with water to remove impurities and prepare a slurry with a concentration of 15 wt %, add 40 wt % of hydrogen peroxide to the slurry to undergo oxidation reaction at 0 to 5 ° C, and control the hydrogen peroxide and ferrous sulfate. The molar ratio was 1.1:2. After the reaction was complete...

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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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