A kind of preparation method of magnetic iron oxide

Abstract

The invention discloses a magnetic iron oxide preparing method. The magnetic iron oxide preparing method includes: 1) acidizing ferrous sulfate by an acid; 2) mixing the acidized ferrous sulfate with hydrogen peroxide to enable reaction to prepare a hydroxyl-ferric oxide precursor; 3) subjecting the hydroxyl-ferric oxide precursor and ammonium bicarbonate or ammonium carbonate to neutralization reaction so as to obtain a reaction product; 4) subjecting the reaction product to solid-liquid separation and collecting solid phases; 5) drying and roasting the solid phases sequentially to prepare magnetic iron oxide. The magnetic iron oxide has a lot of lattice imperfections, a lot of active binding sites and a large specific surface area, thereby being high in adsorption capacity and widely applicable to the fields of sewage treatment and gas purification.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and desulfurization purification, and in particular relates to a preparation method of magnetic iron oxide. Background technique [0002] In the field of sewage treatment and desulfurization purification technology, reagents are often needed to remove impurities in sewage or sulfur in sulfur-containing substances, so as to achieve the purpose of purifying sewage and sulfur-containing substances. In particular, coal or petroleum contains a lot of sulfur-containing substances, which will release hydrogen sulfide in the process of preparing chemical raw materials, which directly leads to poisoning and deactivation of catalyst active substances in subsequent production sections. In order to avoid the above problems, the prior art usually uses a desulfurizer to remove the hydrogen sulfide released in the above process. [0003] In order to better realize the removal of hydrogen sulfide, the r...

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Problems solved by technology

[0005] The above technology mixes solid soluble ferrous salt with solid hydroxide to obtain a mixture, and kneads the mixture to complete the reaction. During the kneading process, the temperature of the material is controlled not to exceed 70°C, and through the oxidation of oxygen in the air, Finally, the mixture is oxidized into amorphous iron oxyhydroxide, but the whole oxidation process is gentle, time-consuming, the oxidation rate is slow, the grain grows gradually, and finally forms iron oxyhydroxide with crystal form, resulting in the reduction of crystal defects, The reduction of active sites and specific surface area leads to a corresponding decrease in physical adsorption capacity and chemical adsorption capacity, which ultimately leads to fewer crystal defects in the magnetic iron oxide prepared after roasting, a decrease in specific surface area, and fewer active sites combined with sulfur.

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