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Method for directly preparing high-purity bismuth oxide from crude bismuth

A technology of bismuth oxide and coarse bismuth, applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of high energy consumption, low purity of high-purity bismuth oxide, high impurity content, etc., to reduce energy consumption, preparation method Simple and easy to use, energy-saving effect

Pending Publication Date: 2021-06-22
昆山金城试剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for directly preparing high-purity bismuth oxide from crude bismuth, so as to overcome the disadvantages of low purity of high-purity bismuth oxide in the prior art, high impurity content, large energy consumption and complicated preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The method for directly preparing high-purity bismuth oxide from a kind of coarse bismuth comprises the following steps:

[0071] (1) Nitric acid impurity treatment: provide crude bismuth and place it in a nitric acid solution with a concentration of 2.0mol / L, stir for 30-60min at a temperature of 30-40°C, filter and dry to obtain a solid bismuth oxynitrate ;

[0072] (2) Alkali treatment: place the bismuth oxynitrate solid prepared in step (1) in an ammonia water-ammonium carbonate buffer solution with a pH value of 9, mix evenly, and perform ultrasonic treatment at room temperature for 3-5 hours to obtain a mixed liquid;

[0073] (3) Put the mixed solution prepared in step (2) in a high-pressure reactor, react at a temperature of 50-70°C for 3-5 hours, and perform suction filtration and drying after the reaction to obtain the high-purity oxidation bismuth.

[0074] During the suction filtration process in the step (1), use a concentration of 0.1mol / L dilute nitric ...

Embodiment 2

[0081] The method for directly preparing high-purity bismuth oxide from a kind of coarse bismuth comprises the following steps:

[0082] (1) Nitric acid impurity treatment: provide crude bismuth and place it in a nitric acid solution with a concentration of 3.0mol / L, stir for 30-60min at a temperature of 30-40°C, filter and dry to obtain bismuth oxynitrate solid ;

[0083] (2) Alkali treatment: place the bismuth oxynitrate solid prepared in step (1) in an ammonia water-ammonium carbonate buffer solution with a pH value of 9.5, mix evenly, and perform ultrasonic treatment at room temperature for 3-5 hours to obtain a mixed liquid;

[0084] (3) Put the mixed solution prepared in step (2) in a high-pressure reactor, react at a temperature of 50-70°C for 3-5 hours, and perform suction filtration and drying after the reaction to obtain the high-purity oxidation bismuth.

[0085] During the suction filtration process in the step (1), use a dilute nitric acid concentrate with a co...

Embodiment 3

[0092] The method for directly preparing high-purity bismuth oxide from a kind of coarse bismuth comprises the following steps:

[0093] (1) Nitric acid impurity treatment: provide crude bismuth and place it in a nitric acid solution with a concentration of 4.0mol / L, stir for 30-60min at a temperature of 30-40°C, filter and dry to obtain a solid bismuth oxynitrate ;

[0094] (2) Alkali treatment: place the bismuth oxynitrate solid prepared in step (1) in an ammonia water-ammonium carbonate buffer solution with a pH value of 10, mix evenly, and perform ultrasonic treatment at room temperature for 3-5 hours to obtain a mixed liquid;

[0095] (3) Put the mixed solution prepared in step (2) in a high-pressure reactor, react at a temperature of 50-70°C for 3-5 hours, and perform suction filtration and drying after the reaction to obtain the high-purity oxidation bismuth.

[0096] During the suction filtration process in the step (1), use a dilute nitric acid concentrate with a c...

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Abstract

The invention provides a method for directly preparing high-purity bismuth oxide from crude bismuth. The method comprises the following steps: providing crude bismuth, putting the crude bismuth into a nitric acid solution with the concentration of 2.0 mol / L-5. 0mol / L, stirring for 30-60 minutes at the temperature of 30-40 DEG C, and carrying out suction filtration and drying treatment to obtain a bismuth oxynitrate solid; putting the prepared bismuth oxynitrate solid into an ammonia water-ammonium carbonate buffer solution with the pH value of 9-10, uniformly mixing, carrying out ultrasonic treatment at normal temperature for 3-5 hours to prepare a mixed solution, putting the mixed solution into a high-pressure reaction kettle, reacting at the temperature of 50-70 DEG C for 3-5 hours, and carrying out suction filtration and drying treatment after the reaction is finished to prepare the high-purity bismuth oxide. According to the method for directly preparing the high-purity bismuth oxide from the crude bismuth, the acid treatment, the alkali neutralization and the hydro-thermal treatment are sequentially carried out, the purity of the purified bismuth oxide can reach 99.98% or above, the hydro-thermal method is adopted to replace a high-temperature calcination method in the preparation method process, energy consumption is reduced, energy is saved, and the preparation method is simple, easy to implement and suitable for industrial production. The method is a green and environment-friendly process.

Description

technical field [0001] The application relates to a method for directly preparing high-purity bismuth oxide from crude bismuth, which belongs to the field of bismuth oxide preparation. Background technique [0002] High-purity bismuth oxide can be used to make bismuth salts, and is widely used in ceramic coloring, fireproof paper manufacturing, and catalysts. In the prior art, bismuth oxide is generally purified by calcining, but the obtained bismuth oxide is lemon yellow. Compared with high-purity bismuth oxide, the purity is lower, the impurity content is higher, the energy consumption is large, and the preparation process is cumbersome and efficient. lower. Therefore, how to provide a high-purity bismuth oxide preparation process with high purity, energy saving and simple preparation method is an urgent problem to be solved. Contents of the invention [0003] The purpose of the present invention is to provide a method for directly preparing high-purity bismuth oxide f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00
CPCC01G29/00C01P2006/80
Inventor 郁亮周志坚李兴元王建远徐强
Owner 昆山金城试剂有限公司