Method for preparing material containing amorphous iron oxide hydroxide and methods for regenerating the same

An iron oxyhydroxide, amorphous technology, applied in iron oxide/iron hydroxide and other directions, can solve the problems of non-regeneration or high regeneration cost, non-regeneration, environmental pollution, etc., to achieve controllable oxidation process, improve stability, desulfurization good effect

Active Publication Date: 2010-07-07
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned research is still in the stage of laboratory exploration, and the prepared product still contains a large amount of ferric oxide, ferric oxide and other crystalline ferric oxyhydroxides, and the content of amorphous ferric oxyhydroxides has not reached the desired level. and the regeneration method has not been systematically studied. It is only disclosed that the prepared product containing amorphous ferric oxyhydroxide can be oxidized and regenerated in the air in a natural state, but there is no research on its industrial regeneration method. Research
[0006] The ultimate goal of the applicant for the above research is to realize industrial mass production of amorphous iron oxyhydroxide with high purity and high sulfur capacity and the industrial mass regeneration of the amorphous iron oxyhydroxide after use, if The realization of these two point

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of Materials Containing Amorphous Iron Oxyhydroxide:

[0020] 152 g FeSO 4 ·7H 2 O is made into an aqueous solution and placed in a reaction kettle, and 45 grams of solid NaOH is added under stirring conditions. By controlling the feeding rate of solid NaOH, the reaction temperature does not exceed 70°C. After the reaction is completed, filter and wash the filter cake with water until the filter cake Na + The content of the filter cake is less than 0.5%, and then the filter cake is made into a water suspension with a solid mass percentage of 30%, and the air is passed through for oxidation until Fe 2+ / Fe 总 If it is 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 Impurities in O, the followi...

Embodiment 2

[0026] Preparation of Materials Containing Amorphous Iron Oxyhydroxide:

[0027] 127 g FeCl 2 4H 2 O is made into an aqueous solution and placed in a reaction kettle, and 75 grams of solid KOH are added under stirring conditions. By controlling the feeding rate of solid KOH, the reaction temperature does not exceed 50°C. After the reaction is completed, filter and wash the filter cake with water until the filter cake K + The content of the filter cake is less than 0.5%, and then the filter cake is made into a water suspension with a solid mass percentage of 15%, and the air is passed through for oxidation until Fe 2+ / Fe 总 If it is 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 80%, and the remaining components are KCl , water and unknown impurities, the sulfur capacity of the material is 50%. where K + The de...

Embodiment 3

[0034] Preparation of Materials Containing Amorphous Iron Oxyhydroxide:

[0035] The solid Fe(NO 3 ) 2 ·6H 2 O is made into an aqueous solution and placed in a reaction kettle, and solid NaOH is added under stirring conditions, and the reaction temperature is maintained at 30-40°C by controlling the feeding rate of solid NaOH, and the pH of the solution at the end of the reaction is controlled to be 7.5, and the solution is filtered. , the filter cake was washed with water until the Na in the filter cake + The content of the filter cake is less than 0.5%, and then the filter cake is made into a water suspension with a solid mass percentage of 10%, and the air is passed through 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 content of the material The capacit...

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Abstract

The invention relates to a method for preparing a material containing amorphous iron oxide hydroxide and two methods for regenerating the same after being used as desulfurizer. The content of the amorphous iron oxide hydroxide in the material prepared by the invention is as high as 65% to 100%, so the sulfur capacity of the material is high; and the desulfurizer in the prior art is non-regenerative or costly for regeneration, so that the desulfurizer in a large amount cannot but be dumped as waste liquid in landfills, while the amorphous iron oxide hydroxide in the material of the invention can be repeatedly regenerated and reused after the material is used as the desulfurizer, thereby solving the problems of the waste of effective resources in the original desulfurizer and the severe environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing a material containing amorphous iron oxyhydroxide and a method for regenerating the prepared material containing amorphous iron oxyhydroxide after being used as a desulfurizing agent, belonging to the technical field of desulfurizing agents. Background technique [0002] Iron oxyhydroxide (FeOOH) is widely used as a desulfurizer in the chemical industry because of its good desulfurization performance. For example, Japanese Patent Document JP5329362A discloses a β-FeOOH desulfurizer for removing hydrogen sulfide in industrial wastewater and a preparation method thereof. In the article titled "Research on the desulfurization activity of iron oxyhydroxide prepared by different methods" ("Coal Conversion" Volume 29, Issue 3), different crystalline iron oxyhydroxides such as α-FeOOH, β-FeOOH, γ- The normal temperature gas desulfurization activity of FeOOH and amorphous iron oxyhydroxide, among which amorphous...

Claims

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Application Information

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IPC IPC(8): C01G49/02
Inventor 刘振义喻永生林科
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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