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

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...

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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 points is a major change for the field of desulfurizers, which can solve the following two shortcomings in the desulfurizers of the prior art: (1) because the preparation of iron oxyhydroxide is subject to reaction conditions such as pH value , temperature, oxidant, etc. are strongly affected, and different preparation methods will obtain iron oxyhydroxides of different crystal phases or other iron oxides (such as ferric oxide, ferric oxide), so the prepared materials are amorphous The content of iron oxyhydroxide is low (less than 40%), resulting in low sulfur capacity and non-renewability; (2) other types of desulfurizers currently used cannot be regenerated or have high regeneration costs, resulting in a large amount of waste agents that can only be landfilled , not only wasting the effective resources in the original desulfurizer, but also causing serious pollution to the environment