Superfine and high-purity bismuth oxide and preparation method thereof

Abstract

The invention relates to a superfine and high-purity bismuth oxide with the granularity of 10-1000nm and a preparation method thereof. The method takes the solid bismuth with the purity of 4N as a raw material to synthesize the superfine and high-purity bismuth oxide, and is characterized in comprising the following steps of: firstly, soaking the solid bismuth with the purity of 4N into mixed acid solution which is prepared by hydrogen nitrate and muriatic acid; taking out the soaked solid bismuth, and enabling the soaked solid bismuth to react with hydrogen nitrate solution to obtain the bismuth nitrate solution and keep the excessive status of the hydrogen nitrate; mixing the bismuth nitrate solution with the ammonia water solution to perform synthetic reaction; filtrating to obtain white bismuth hydroxide deposition; and washing, drying, calcining and preparing powder according to a conventional method to obtain the superfine and high-purity bismuth oxide with the phase of alpha-Bi2O3, the granularity of 10-100nm and the purity of 5N. The technological condition is easily controlled, has good product homogeneity, and does not need to an add dispersing agent, thereby being capable of obtaining the superfine bismuth oxide powder with even granularity, preventing impurity from being induced, and reducing the preparation cost.

Description

Technical field [0001] The invention relates to a bismuth oxide used in the electronics industry and a production method thereof, in particular to an ultrafine high-purity bismuth oxide with a particle size of 10-100 nm and a production method thereof. Background technique [0002] Ultra-fine high-purity bismuth oxide is a light yellow powder with a phase of α-Bi 2 O 3 , A spherical aggregate with a particle size of 10-100nm and a purity of 5N. Wide range of uses, mainly used in the production of electronic ceramic powder materials, ferrite magnetic materials, electrolyte materials, photoelectric materials and superconducting materials, etc., and can be used as organic synthesis catalysts, special glass, chemical fiber flame retardants and environmental protection Battery additives, etc. [0003] At present, there are two main types of methods for preparing ultra-fine high-purity bismuth oxide. One is to directly use 5N or above high-purity bismuth to synthesize through a series o...

AI Technical Summary

Problems solved by technology

Chinese patent 200810147959.2 discloses a production method of high-purity ultra-fine bismuth oxide. The steps are as follows: ball mill bismuth salt compound, dispersant, ammonium bicarbonate and a small amount of solvent to obtain bismuth oxycarbonate, wash with deionized water, and mix with certain A certain amount of ammonium bicarbonate is mixed evenly and calcined to obtain the target product; the above-mentioned dispersant is taken from one of Tween, Span or emulsifier OP; the fine powder with a particle size of less than 1 μm can be obtained, and the process conditions of the above-mentioned method are easy to control , the product uniformity is good, but the process is more complicated and the production cost is higher

It still needs to use a dispersant, adding a dispersant is easy to introduce impurities, but also increases the cost, the separation procedure is complicated, and more importantly, the particle size of the obtained product does not meet the requirement of a particle size of 10-100nm

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