Method for preparing spinel-type complex oxide through co-precipitation, homogenization and spray drying

Abstract

The invention belongs to the field of chemical engineering and relates to a preparation method of a spinel type material, in particular to a method for preparing a spinel-type complex oxide through co-precipitation, homogenization and spray drying. According to the method, a mixed solution of two metallic nitrates and an alkaline solution are combined and added to a precipitation tank for a reaction, an obtained material is washed by deionized water, filtered, subjected to beating and refined by a homogenizer and then is sent to a spray drying machine, the dried material is subjected to calcination, and the spinel-type complex oxide powder is obtained. The method has the advantages of low calcination temperature, short time and low energy consumption, and a product has low loss, high purity and small particle size.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a method for preparing spinel-type materials, in particular to a method for preparing spinel-type composite oxides through co-precipitation-homogenization-spray drying. Background technique [0002] The general chemical formula of spinel composite oxide is AB 2 o 4 , where A is mostly a divalent cation, B is mostly a trivalent cation, and A and B can be the same. Spinel-type composite oxides are widely used as catalytic, refractory, and energy conversion and storage materials due to their excellent high temperature stability and mechanical strength. The traditional methods for preparing such materials mainly include: (1) mechanical mixing methods, such as : South China University of Technology discloses a lithium-ion battery anode material LiMn 2 o 4 The high-temperature solid-phase method (CN103904321A) requires the lithium source and the manganese source to undergo two contin...

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Problems solved by technology

[0003] In the above method, when the spinel is prepared by the mechanical mixing method, because the raw materials are difficult to mix uniformly, the phases cannot be fully contacted to cause a solid solution reaction, so the product components are not uniform, the purity is not high, and the particle size is large. At the same time The calcination temperature is high; in the co-precipitation method, the component segregation phenomenon is easy to occur when the material is conventionally dried, which will also cause the product composition to be uneven and the purity is not high. This method also has the problem of high calcination temperature; the sol-gel method forms A uniform and stable gel takes a long time, the formed colloid is not easy to wash, and the calcination temperature is also high; hydrothermal synthesis of spinel materials requires a long time to crystallize in a reactor with a certain pressure, and the preparation cycle is long, which is not suitable Large-scale industrial production; the vapor deposition method needs to heat up the material, which requires high energy consumption, and has the disadvantages of serious material loss and low product yield

[0004] Southwest Chemical Industry Research and Design Institute Co., Ltd. patent CN102755897A discloses a method of step-by-step co-precipitation-spray drying to prepare copper-based methanol dehydrogenation to methyl formate catalyst, but so far there is no such thing as co-precipitation, homogeneity, and spray drying. A report on preparation of spinel-type composite oxides by process

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