A method for preparing zero-emission oxide ceramic powder and its production system

Abstract

The invention discloses a zero-discharge oxide ceramic powder preparation method, and a production system thereof. According to the zero-discharge oxide ceramic powder preparation method, a precursorraw material and a corresponding solvent A are introduced into a reaction vessel for heating stirring so as to obtain a precursor mixed solution or a sol; a certain amount of a precipitating agent isadded for precipitation of the precursor mixed solution, or condensation polymerization is adopted to convert the precursor mixed solution into gel; after the above reaction, a non-aqueous high boiling point solvent is added, distillation and recycling of low boiling point by products are carried out so as to obtain a non-aqueous high boiling point solvent and precursor precipitate or gel mixed solution; and at last reduced pressure drying is carried out so as to obtain a target powder precipitate or a dried gel, and the non-aqueous high boiling point solvent B is subjected to recycling and calcining so as to obtain a final powder. All the by products are recycled, zero discharge is realized in the whole process, operation is simple, and the application prospect is promising.

Description

technical field [0001] The invention belongs to the technical field of oxide ceramic powder preparation, and in particular relates to a zero-emission oxide ceramic powder preparation method and a production system thereof. Background technique [0002] Oxide ceramic materials usually have a series of excellent properties such as high melting point, corrosion resistance, good electrical insulation, and strong oxidation resistance, and can be used to prepare ceramic knives, valves, bearings, teeth, lampshades, liquid risers, fuel cells, etc. , It is widely used in petroleum, chemical industry, food, medicine, electronics, machinery manufacturing, architectural decoration, aerospace and other fields. The basic feature of the ceramic process is to form a polycrystalline sintered body by molding and sintering the powder as the raw material. Therefore, the preparation of high-quality oxide powder is the premise and basis for obtaining high-performance oxide ceramics. [0003] Th...

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Problems solved by technology

One is to consume a large amount of water or alcohol to wash and remove these by-products of chlorine, which not only wastes water resources (see Journal of Alloys and Compounds 2006, Volume 425, pages 69–75) or consumes a large amount of alcohol (see ZL200610005316.5), and The waste liquid produced will seriously pollute the environment; there is another kind that does not form by-product salts, and directly removes by-products through evaporation

This method usually has high requirements on equipment, and it is difficult to realize industrialization (see Journal of the American Ceramic Society, 2000, vol. 83, No. 9: pp. 2196-2202

), not only that, but in the later stage of evaporation, due to the lack of liquid phase, the heat transfer efficiency of solid precipitation is low, and at this time the precipitation activity is very high, and a large number of by-products are adsorbed in it, which is difficult to remove

It can be seen that the use of chlorine-containing raw materials to prepare oxide ceramic powders is difficult to achieve efficient "zero-emission" industrialization

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