Preparation method of ultrahigh-purity niobium oxide and prepared ultrahigh-purity niobium oxide

Abstract

The invention discloses a preparation method of ultrahigh-purity niobium oxide. The preparation method comprises the steps of acidity regulation, extraction separation, neutralization, precipitation, drying and calcining by taking a fluoroniobic acid solution as a raw material. In the extraction separation step, sec-octyl alcohol is used for extracting the regulated niflumic acid material liquid to obtain an organic phase; subsequently the organic phase is pickled by a pickling agent; finally the pickled organic phase is re-extracted by an anti-niobium agent to obtain the ultrahigh-purity niobium oxide. The invention also provides the ultrahigh-purity niobium oxide prepared by the method; the percentage composition of Nb2O5 is larger than or equal to 99.995%; the content of each impurity satisfies the regulations of the standard YS / T548-2007 on product grades F Nb2O5-048 and F Nb2O5-045.

Description

technical field

[0001] The invention belongs to the field of metal chemical smelting, and in particular relates to a method for preparing ultra-high-purity niobium oxide and the ultra-high-purity niobium oxide prepared by the method. Background technique

[0002] High-purity niobium oxide (99.99%) is an important raw material and functional material for the high-tech new material industry. It is used to prepare lithium salt crystals (lithium niobate) and wafers. Sensing technology, especially military radar, electronic countermeasures, navigation and other cutting-edge technology fields have been widely used. In the current industry standard YS / T548-2007, the product grade of high-purity niobium oxide is FNb 2 o 5 -04, where F means powder, Nb 2 o 5 Indicates the molecular formula of niobium pentoxide (niobium oxide), and 04 indicates that the purity of the product is 99.99%.

[0003] In the prior art, the preparation of the high-purity niobium oxide usually takes ferro...