Amorphous FeOOH and method for regenerating desulfurizing agent taking amorphous FeOOH as active ingredient

An iron oxyhydroxide and amorphous technology, which is applied in combustible gas purification, sulfur preparation/purification, combustible gas purification/transformation, etc., can solve the slow regeneration of amorphous iron oxyhydroxide, desulfurizer can not regenerate regeneration costs, and cannot adapt Problems such as rapid and large-scale regeneration, to achieve the effects of controllable oxidation process, good economic and environmental significance, and high sulfur capacity

Active Publication Date: 2010-07-07
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

However, the above research is still in the stage of laboratory exploration. The regeneration of amorphous iron oxyhydroxide in the natural state is very slow and takes a long time, so it cannot meet the requirements of rapid and large-scale regeneration required by industrial production.
[0004] An important purpose of the applicant's above-mentioned research is to achieve industrial mass regeneration of the amorphous iron oxyhydr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Preparation of amorphous iron oxyhydroxide:

[0014] The solid Fe(NO 3 ) 2 ·6H 2 O is made into an aqueous solution and placed in the reactor, put into solid NaOH under stirring condition, keep the reaction temperature at 30-40 ℃ by controlling the feeding speed of solid NaOH, and control the pH=7.5 of the solution at the end of the reaction, filter the solution , the filter cake was washed with water until Na in the filter cake + The content of the filter cake is less than 0.5%, then the filter cake is made into an aqueous suspension with a solid mass percentage of 10%, and air is introduced for oxidation until Fe 2+ / Fe 总 If less than 1%, the material is completely oxidized, filtered, and dried at 80 ° C to obtain a material containing amorphous iron oxyhydroxide. The mass percentage of amorphous iron oxyhydroxide in the material is 100%, and the sulfur of the material is capacity is 62%. Fe mentioned in the embodiment 总 refers to the total content of iron, Fe ...

Embodiment 2

[0020] Preparation of materials containing amorphous iron oxyhydroxide:

[0021] Put 152 g FeSO 4 ·7H 2 O is made into an aqueous solution and placed in the reactor, and 45 grams of solid NaOH are put into the stirring condition, and the reaction temperature is not more than 50 ° C by controlling the feeding rate of the solid NaOH. After the reaction is completed, filter, and the filter cake is washed with water until the Na + The content of the filter cake is less than 0.5%, then the filter cake is made into an aqueous suspension with a solid mass percentage of 30%, and air is introduced for oxidation until Fe 2+ / Fe 总 If less than 1%, the material is completely oxidized, filtered, and dried at 90 ° C to obtain a material containing amorphous iron oxyhydroxide. The mass percentage of amorphous iron oxyhydroxide in the material is 85%, and the remaining components are Na 2 SO 4 , water and TiO 2 (TiO 2 for industrial FeSO 4 ·7H 2 The impurities in O are the same as in...

Embodiment 3

[0025] Preparation of materials containing amorphous iron oxyhydroxide:

[0026] 127 g FeCl 2 ·4H 2 O is made into an aqueous solution and placed in the reaction kettle, 72 grams of solid KOH are put into the stirring condition, and the reaction temperature is not more than 50 ° C by controlling the feeding rate of the solid KOH, after the reaction is completed, filter, and the filter cake is washed with water until the filter cake K + The content of the filter cake is less than 0.5%, then the filter cake is made into an aqueous suspension with a solid mass percentage of 15%, and air is introduced for oxidation until Fe 2+ / Fe 总 If less than 1%, the material is completely oxidized, filtered, and dried at 100 ° C to obtain a material containing amorphous iron oxyhydroxide. The mass percentage of amorphous iron oxyhydroxide in the material is 81%, and the remaining components are KCl , water and unknown impurities, the sulfur content of the material is 50%. where K + The d...

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Abstract

The invention relates to a method for regenerating a desulfurizing agent taking amorphous FeOOH as an active ingredient, which comprises the following steps: grinding the waste agent after the amorphous FeOOH is used as the desulfurizing agent into granules to obtain waste agent powder; preparing the waste agent powder into suspension, introducing oxygen-containing gas into the suspension for oxidation, making iron sulfide in the suspension converted into the amorphous FeOOH and elemental sulfur so as to form slurry containing the amorphous FeOOH and simple substance sulfur; and putting the slurry in a container, introducing air into the container to make the elemental sulfur floating upwards, wherein the sediment on the lower part of the container is the regenerated amorphous FeOOH. The regeneration method solves the problems that a large amount of waste agents can only be buried, not only effective resources in the original desulfurizing agent are wasted, but also the environment is seriously polluted because the other desulfurizing agents used in the prior art cannot be regenerated after being used once or the regeneration cost is high.

Description

technical field [0001] The invention relates to a regeneration method after amorphous iron oxyhydroxide is used as a desulfurizer, and also relates to a regeneration method of a desulfurizer using amorphous iron oxyhydroxide as an active component, belonging to the technical field of desulfurizers. Background technique [0002] In the prior art, especially in the aspect of industrial application, there are relatively few studies on the preparation and regeneration of amorphous iron oxyhydroxide. In the article titled "Study on the desulfurization activity of iron oxyhydroxide prepared by different methods" ("Coal Conversion" Vol. 29 No. 3), different crystalline iron oxyhydroxides such as α-FeOOH, β-FeOOH, γ- The room temperature gas desulfurization activity of FeOOH and amorphous iron oxyhydroxide, among which amorphous iron oxyhydroxide has higher desulfurization activity. However, there is no disclosure in this article about the regeneration of amorphous iron oxyhydroxide...

Claims

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Application Information

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IPC IPC(8): C01B17/04C10K1/26
Inventor 刘振义刘凤仁林科
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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