Preparation method and application field of bismuth oxide

Method for preparing bismuth oxide

1. To the bismuth nitrate solution (80-90°C), dropwise add a carbon dioxide-free sodium hydroxide aqueous solution and mix. The solution remains alkaline during the precipitation process, and a white, volume-swelling bismuth oxide hydrate Bi(OH)3 precipitates. This solution is heated and stirred for a short time to be dehydrated into yellow bismuth trioxide. After washing with water decantation, filtering, and drying, the finished bismuth oxide product is obtained.

2. Under a nitrogen atmosphere, add dropwise a 1.5 mol/L sodium hydroxide aqueous solution without carbon dioxide to a 0.1 mol/L bismuth nitrate solution dissolved in 1 mol/L nitric acid (at 80-90° C.) to mix them. The solution remains alkaline during precipitation. Although a white, volume-expanded bismuth oxide hydrate Bi(OH)3 precipitates, it is dehydrated and turned into light yellow bismuth trioxide after being stirred in the hot solution for a while. Decant and wash 15 times with water without air and carbon dioxide, filter and dry.

3. After the metal bismuth is put into the graphite crucible and melted, under the oxygen flow, an arc is formed between the graphite electrode and the metal surface to heat and oxidize. To ensure adequate supply of oxygen, the crucible should be placed in a large container and oxygen should be continuously supplied. The reaction temperature is 750-800°C, and β-bismuth trioxide with a purity of 99.8% or more is quickly generated. After the product is quenched in water or on a cold metal plate, a high-temperature phase β-type product can be obtained.

4. Slowly add Bi(NO3)3·5H2O acidic solution (20g dissolved in 2mol/L HNO3) to the excess sodium carbonate solution and stir vigorously. Obtain the Bi2O3CO3 precipitate, filter, wash, and dry. Place it in an aluminum boat and heat it in the air at 650K for about 1.5 hours to obtain β-Bi2O3

5. Burn the bismuth subnitrate at 400～500℃ to remove NO3- ions for about (3～4h):

2BiONO3=Bi2O3+NO+NO2+O2

The burning is over, and after cooling, all turn into lemon yellow, which is the finished product.

6. Use a small amount of dilute nitric acid to wash 16kg of 99.9% industrial bismuth surface, and then use conductive water to wash away the surface nitric acid. Then add 1:1 high-purity nitric acid (35kg of nitric acid with a relative density of 1.42 plus 20L of conductive water), add 1 H, and continue to react for 10 minutes after the addition. After being cooled slightly, it is filtered, the filtrate is heated to 65-70°C, evaporated and concentrated to a relative density of 1.9, cooled and crystallized, and dried to obtain bismuth nitrate. Dissolve the obtained bismuth nitrate with conductive water into a dilute solution, hydrolyze it under stirring, let stand to completely precipitate the bismuth subnitrate, spin the precipitate with a centrifuge or filter by suction, then wash it with thermoconductive water several times, and then dry by suction. , Pulverize, burn at 500℃ for 7-8h, grind after a little cooling, and burn for 4-5h. After cooling, 99.99% high-purity bismuth oxide can be obtained.

Overview of bismuth oxide Bi2O3 powder

Bi2O3 bismuth oxide powder is one of the most important bismuth compounds. It has excellent dielectric properties, high oxygen fluidity, large energy gap, high refractive index, significant photoconductivity and photoluminescence. It is an advanced functional material ；

Pure bismuth trioxide has α type and β type. The α type is yellow monoclinic crystal, the relative density is 8.9, and the melting point is 825°C. Soluble in acid, insoluble in water and alkali. β type is bright yellow orange, cubic crystal system, relative density 8.55, melting point 860°C, soluble in acid and insoluble in water. Easily reduced to metallic bismuth by hydrogen, hydrocarbons, etc.

Application of bismuth oxide Bi2O3 powder

Used to prepare bismuth salt; used as electronic ceramic powder material, electrolyte material, photoelectric material, high temperature superconducting material, catalyst. As an important additive in electronic ceramic powder materials, bismuth oxide usually requires a purity greater than 99.15%. Mainly used zinc oxide varistors, ceramic capacitors, ferrite magnetic materials; glaze glue compounding agent, medicine, red glass compounding agent, etc.

Bismuth oxide Bi2O3 powder is widely used in the electronics industry, chemical industry, glass industry, plastic industry, ceramic glaze and other material industries, such as electronic ceramic powder materials, electrolyte materials, magnetic materials, photoelectric materials, high-temperature superconducting materials, catalysts, Fireproof materials (fireproof paper), nuclear reactor fuel, firework materials, radiation protection materials, ceramic packaging materials, etc.

Bi2O3 powder price

The price of Bi2O3 bismuth oxide powder will change randomly according to factors such as production cost, transportation cost, international situation, and market supply and demand of Bi2O3 bismuth oxide powder. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for Bi2O3 bismuth oxide powder, please feel free to send an inquiry to get the latest price of Bi2O3 bismuth oxide powder.

Bismuth oxide Bi2O3 powder suppliers

As a global supplier of bismuth oxide Bi2O3 powder, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including boron carbide, aluminum carbide, titanium carbide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.