Method for preparing high-purity bismuth oxide

Abstract

The invention belongs to a method for preparing high-purity bismuth oxide, which comprises the steps: (1) metal bismuth is added to a stainless steel reaction vessel after being washed by high-purity water, the high-purity water and high-purity nitric acid are added to carry out a heating reaction; the reactant is filtered after being cooled; the filtrate is condensed and cooled to obtain crystals; (2) the crystals in the step (1) are dissolved into a saturated solution by high-purity water; the saturated solution is added to the stainless steel reaction vessel and hydrolyzed under the stirring for standing; the bismuth subnitrate is completely precipitated; the supernatant liquor is eliminated; the precipitation is pumped; the pumped precipitation is washed by high-purity water, pumped and dried; the dried bismuth subnitrate is pulverized and added to a ceramic evaporating dish; then the pulverized bismuth subnitrate is transferred to a muffle furnace to be baked; the baked bismuth subnitrate is pulverized after being cooled; and the pulverized bismuth subnitrate is added to the muffle furnace to be baked and cooled so as to obtain the high-purity bismuth oxide finished product. The method for preparing the high-purity bismuth oxide has the advantages of simple process step and high production efficiency, and the high-purity bismuth oxide has the advantages of low impurity content and high purity.

Description

technical field [0001] The invention belongs to the field of inorganic compounds, in particular to a preparation method of high-purity bismuth oxide. Background technique [0002] High-purity bismuth oxide is widely used in the manufacture of resistance elements and bismuth germanate single crystals. The current preparation method is to put bismuth nitrate in a porcelain dish, burn it at 400°C-500°C for 3-4 hours, and cool the burnt product, that is, bismuth oxide. Bismuth yellow has a certain gap, the purity is low, the impurity content is high, and the process is relatively cumbersome, the production efficiency is low, and it is not competitive in the market. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing high-purity bismuth oxide with simple process steps, high production efficiency, low impurity content and high purity. [0004] The present invention is achiev...

AI Technical Summary

Problems solved by technology

The current preparation method is to put bismuth nitrate in a porcelain dish, burn it at 400°C-500°C for 3-4 hours, and cool the burnt product, that is, bismuth oxide. Bismuth yellow has a certain gap, the purity is low, the impurity content is high, and the process is relatively cumbersome, the production efficiency is low, and it is not competitive in the market