Method of continuous phase transition of heterogeneous system in preparation of inorganic powder through hydrothermal method

Abstract

The invention discloses a method for the continuous phase transition of a multiphase system in an inorganic powder prepared by a hydrothermal method, which is to mix a solid phase and a liquid phase into a slurry, and use a pump to send the slurry into a high-pressure container at high pressure; The container is heated, part of the liquid phase changes into a gas phase, and the solid phase changes into a new solid phase; the reaction product is continuously discharged from the high-pressure container through the pressure lock device into the decompression chamber, and the liquid phase is transformed into a gas phase in the decompression chamber. Through the centrifuge, the gas-solid is separated to obtain a solid product, and the gas is condensed into a liquid phase and reused. This method is mainly used for the continuous preparation of inorganic powders, such as hemihydrate gypsum and nano iron oxide powders, by hydrothermal method.

Description

technical field [0001] The invention relates to a method for preparing inorganic powder, in particular to a hydrothermal method for preparing inorganic powder. Background technique [0002] The hydrothermal method was studied by geologists simulating natural mineralization in the middle of the 19th century. After 1900, scientists established the theory of hydrothermal synthesis, and then began to study functional materials. At present, more than 100 kinds of crystals have been prepared by hydrothermal method. Hydrothermal method, also known as hydrothermal method, belongs to the category of liquid phase chemical method. It refers to the chemical reaction carried out under the conditions of high temperature and high pressure in a sealed pressure vessel with water as the solvent. Since the rise of ultrafine powder in the 1970s, the hydrothermal method has been paid attention to by many countries in the world. The academic field of hydrothermal technology is very active in ...

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Problems solved by technology

At present, the equipment for preparing inorganic powder by hydrothermal method is mainly a batch autoclave, a

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