Preparation method of magnetic iron oxide

Abstract

The invention discloses a preparation method of a magnetic iron oxide. The preparation method comprises the following steps that 1, solid soluble ferrite and solid ammonium carbonate and/or solid ammonium bicarbonate are mixed and kneaded, water is added in the mixing and kneading process to form slurry, the pH value of the slurry in the mixing and kneading process is controlled to be 6.5-7, and the pH value of the slurry when the mixing and kneading process is finished is controlled to be 7-8; 2, the slurry obtained in the step 1 is subjected to first-time solid-liquid separation, and a first solid phase is collected; 3, water is adopted for being matched with the first solid phase to form a sizing, hydrogen peroxide is added into the sizing to perform an oxidation reaction, after the reaction is ended, second-time solid-liquid separation is performed, and a second solid phase is collected; 4, the second solid phase is dried and roasted in sequence, and the magnetic iron oxide is obtained. The magnetic iron oxide crystal has multiple defects, the magnetic iron oxide is large in specific surface area, and multiple bonding active sites combined with sulfur elements exist, so that the magnetic iron oxide has the high breakthrough sulfur capacity.

Description

technical field [0001] The invention belongs to the technical field of desulfurization and purification, and in particular relates to a preparation method of magnetic iron oxide. Background technique [0002] Coal or petroleum contains a lot of sulfur-containing substances, which will release hydrogen sulfide in the process of preparing chemical raw materials, which will directly lead 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 researchers explored the influence of the composition and structure of the desulfurizer on the removal effect of hydrogen sulfide, and prepared a wide variety of desulfurizers. The currently prepared desulfurizers are mostly iron-based desulfurizers, manganese oxide desulfurizers, solid al...

AI Technical Summary

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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