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A bismuth oxide, high-purity technology, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve the problems of low purity, cumbersome process, low production efficiency, etc., and achieves simple preparation method, simple process steps, and production efficiency. high effect
Inactive Publication Date: 2011-03-23
TIANJIN CHEM REAGENT RES INST
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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 yel...
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Embodiment 1
[0014] A preparation method of high-purity bismuth oxide, the steps of which are:
[0015] (1) Wash 1.5Kg of metal bismuth with high-purity water and put it into a stainless steel reaction pot, add 2Kg of high-purity water and 2Kg of high-purity nitric acid, conduct a heating reaction for 1 hour and 10 minutes, control the temperature at 60°C, filter after cooling, and concentrate the filtrate To 20Be, cooling to obtain crystallization;
[0016] (2), the crystallization in the step (1) is dissolved into a saturated solution with high-purity water, put into a stainless steel reaction pot, carry out hydrolysis under stirring, leave standstill for 10 minutes, bismuth subnitrate is completely precipitated, discard the supernatant, Drain the sediment, wash it with high-purity water for 4 times, then drain it, and dry it at 80°C. Grind the dried bismuth subnitrate, put it in a porcelain evaporating dish, move it to a muffle furnace, and burn it at 500°C After cooling for 6 hours, g...
Embodiment 2
[0018] A preparation method of high-purity bismuth oxide, the steps of which are:
[0019] (1), 2Kg metal bismuth is put into stainless steel reaction pot after washing with high-purity water, slowly add 2.5Kg high-purity water and 2.5Kg high-purity nitric acid, carry out heating reaction 1 hour and 15 minutes, temperature is controlled at 62 degrees, filter after cooling, and The filtrate is put into a stainless steel pot and concentrated, concentrated to 22Be, and cooled to obtain crystallization;
[0020] (2), the crystallization in the step (1) is dissolved as a saturated solution with high-purity water, put into a stainless steel reaction pot, carry out hydrolysis under stirring, leave standstill for 15 minutes, bismuth subnitrate is completely precipitated, discard the supernatant, Drain the sediment, wash it with high-purity water for 5 times, then drain it, and place it in a stainless steel container at 85°C for drying. Grind the dried bismuth subnitrate, put it in a p...
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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...
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