Method used for preparing high purity nanoscale titanium sub-oxides at low temperature

Abstract

The invention relates to a method used for preparing high purity nanoscale titanium sub-oxides at low temperature. The method comprises following steps: nanoscale rutile titanium dioxide, a reducing agent, and a wetting agent are subjected to uniform mixing and pelletizing so as to obtain pellets; the pellets are dried at 105 DEG C for 2 to 4h; the dried pellets are introduced into a microwave rotary kiln at a non-oxidizing atmosphere, are heated to 700 to 900 DEG C, the temperature is maintained for 20 to 60min, and cooling is carried out under the action of a reducing gas flow; after reduction, the pellets are smashed, and are introduced into a ball mill for 20 to 60min of grinding; after grinding, an obtained powder is subjected to 2 to 4h of heat treatment at 200 to 400 DEG C so as toobtain the high purity nanoscale titanium sub-oxides. According to the method, the high purity nanoscale titanium sub-oxides are prepared from rutile titanium dioxide at a relatively low temperature,the preparation process is short, the production efficiency is high, and the method is convenient for continuous industrialized production.

Description

technical field [0001] The invention relates to a method for preparing titanium oxide, in particular to a method for preparing high-purity nano-scale titanium oxide at low temperature. Background technique [0002] Titanium oxide is a series of non-stoichiometric titanium oxides with the general formula Ti n o 2n-1 (n=4~10). In 1959, X-ray scientist Magnéli first used anatase TiO 2 Based on the systematic research on this kind of substances. Therefore, people collectively refer to these substances as Magnéli phase, or titanium oxide for short. In recent years, the study of Magnéli phase has attracted more and more researchers' attention, especially the Ti in Magnéli phase 4 o 7 Due to its excellent properties such as strong corrosion resistance, electrochemical stability, and high electrical conductivity, it has shown great application prospects in combustion battery catalyst carriers, gas sensors, anti-reflection films, and photoelectric catalysis. [0003] At presen...

AI Technical Summary

Problems solved by technology

[0003] At present, titanium dioxide is usually prepared by high-temperature sintering method, and the main reducing agent includes H 2 , NH 3 , C, Ti, Si, Zr, etc., the outstanding problem of the high temperature sintering method is that the material particles grow up and coarsen during the high temperature sintering process, which leads to a great reduction in the performance of the material, because the material particle size, porosity, crystallization The degree directly affects its optical, electromagnetic and electrochemical characteristics.

In order to improve the morphology of materials, researchers have successively developed laser ablation methods, sol-gel-sintering methods, etc., which have achieved control of the morphology and size of materials to a certain extent, and reduced the reduction temperature requirements. It fundamentally solves the problem of particle growth caused by high sintering temperature in the process of material preparation. Table 1 lists some representative titanium dioxide preparation methods

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