Method for preparing Fe3O4 by utilizing metal oxide catalysis
A catalytic preparation and oxide technology, applied in ferrous oxides, iron oxide/iron hydroxide and other directions, can solve the problems of difficult Fe2+ recovery, difficult post-processing, and increased economic costs.
Active Publication Date: 2019-06-14
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
If Fe cannot be controlled 2+ The oxidation process of ions, FeOOH, Fe in the product 2 o 3 The content of impurities such as is high, the post-processing is difficult, and the economic cost is greatly increased
Therefore, the traditional method is in the actual Fe 2+ more difficult to recycle
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[0023] (1) Fe 3 O 4 preparation
[0024] A kind of preparation of Fe using metal oxide catalyst 3 O 4 method, the steps are:
[0025] to Fe 2+ Add the oxide powder of metal M into the solution and disperse, and the addition amount is, in terms of the atomic percentage of M element in the metal M oxide powder and the total metal element in the mixed suspension, M / (M+Fe)=0.1~50at .%;
[0026] Then stir and add the alkaline solution to obtain a mixed solution, and the mixed solution is subjected to a hydrothermal reaction to obtain Fe-containing 3 O 4 Suspension of particles, separation of product Fe 3 O 4 .
[0027] The oxides of metal M are CuO, Cu 2 O, CoO or Co 3 O 4 one or a combination of several. The product can be separated by centrifugation, membrane filtration, magnetic filtration, etc. When CuO or CuO is used as a catalyst, it can be easily removed by magnetic filtration due to its non-magnetic properties.
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A method for preparing Fe3O4 by using a metal oxide catalyst comprises the following steps: adding metal M oxide powder into a Fe<2+> solution, conducting dispersing, then adding an alkali solution toobtain a mixed solution, carrying out hydrothermal reaction on the mixed solution to obtain a turbid liquid containing Fe3O4 particles, and separating out a product Fe3O4, wherein the metal M oxide is at least one of CuO, Cu2O, CoO and Co3O4. Compared with a traditional preparation method, CuO, Cu2O, CoO, Co3O4 and the like are used as a catalyst, an oxidizing agent does not need to be added, high-purity micron-sized Fe3O4 with a monocrystal octahedron is synthesized from a Fe<2+> salt solution in one step under the alkaline condition, and the preparation method is simple in process, efficient, fast and low in cost.
Description
technical field [0001] The invention relates to a preparation method of an iron compound, in particular to a preparation method of Fe using metal oxide catalysis 3 O 4 Methods. Background technique [0002] China pickles millions of tons of iron oxide every year, resulting in a large amount of Fe 2+ of pickling waste. "Water Pollutant Discharge Standard for Iron and Steel Industry" (GB 13456.2012) U clearly stipulates that the total iron content is less than 10mg / L. However, in the general steel pickling waste liquid, there are Fe concentrations greater than 100g / L. 2+ Ions cannot be directly discharged and require harmless treatment. But as waste liquid discharge, a large amount of Fe 2+ Being wasted not only causes a huge environmental burden, but also an economic loss. Therefore, Fe in the waste liquid 2 + It is an urgent need to convert it into a product with economic value. [0003] Preparation of Fe with Pickling Waste Liquid as Raw Material 3 O 4 is a recy...
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Inventor 邵斌杨棋棋周兴超熊易曾文马毅龙孙建春陈登明郭东林李春红
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY