Spraying combustion device and method for compounding metallic oxide powder by spraying

Abstract

The invention relates to a spraying combustion device and a method for compounding metallic oxide powder by spraying. The device comprises a gun body, a flow guiding component and an atomizing nozzle; the flow guiding component is arranged in a hollow chamber of the gun body, is capable of sliding relative to the hollow chamber and is connected with a gas inlet of a combustible gas; the atomizing nozzle penetrates through the flow guiding component and can slide along the hollow chamber following the flow guiding component. The spraying combustion device can realize the optimal matching of spraying and combustion, and meanwhile, the problem of chamber blocking caused by the liquid drops and particles attached to the walls in the spraying combustion process can be effectively avoided, the operation is simple and convenient and the technological process and the preparation time are shortened. The method comprises the step of spraying an aqueous solution containing metal salt into a warm area at 800-2500 DEG C, thereby acquiring the metallic oxide powder. According to the invention, the aqueous solution containing metal salt is selected for replacing a precursor containing organic components in the traditional technology, the production cost is lowered, the technology safety is promoted and the prepared powder product is controllable in morphology and size, high in quality and high in additional value.

Description

technical field [0001] The invention relates to the field of nanometerization of oxide functional materials and synthesis of ultrafine powders, in particular to a spray combustion device and a method for spray synthesis of metal oxide powders. Background technique [0002] Metal oxides, especially transition metal oxides, exhibit outstanding properties in optics, electromagnetism, and catalysis, and thus play an important role in related applications. With the development of nanomaterial preparation technology, various nano-oxides with new shapes and structures have been synthesized and assembled into devices, showing good application performance. Flame synthesis is a typical method for one-step rapid preparation of nanomaterials. Due to its simple equipment and easy scale-up, it has become a promising nanomaterial manufacturing process. [0003] There are many methods for preparing nanomaterials by flame synthesis. For example, CN1665743 discloses a method for producing me...

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Problems solved by technology

However, the above-mentioned method has the following problems: one is that the metal-organic compound is usually relatively expensive, and the irritation, toxicity and flammability of the organic solvent have very strict requirements on the operation, and the operation cost increases accordingly; the other is that due to the need for an organic unit The energy of combustion is provided separately, which leads to an excessively high proportion of organic components in the precursor, and the corresponding cheap aqueous solvent cannot be excessive, thereby increasing the production cost; third, in the existing flame spray pyrolysis system, due to the unstable spray Or the incomplete combustion of organic components will affect the flame structure and stability, making it difficult to effectively control the shape and size of the product, and even in some synthesis, the hydrolysis of organic precursors will seriously affect the quality of the product

[0005] Flame synthesis of metal oxide powder generally requires specific device spraying for preparation, such as CN203373422U discloses "a spray combustion device", CN103305810A discloses a device for spraying and burning films and spraying patterns, patent CN102614862A "a kind of yttrium doped Flame plasma synthesis of cerium-zirconium solid solution and its plasma flame combustion device", however, the above-mentioned synthesis devices are generally only suitable for liquid precursors containing organic components; and the structure of the components is fixed, so it is difficult to effectively adjust the structural parameters during spraying; During the spraying process, droplets and particles are easy to adhere to the wall and block the cavity

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