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Bismuth oxide preparation
1. Add a dropwise amount of sodium hydroxide water aqueous solution to the bismuth-nitrate solution (80-90degC) and mix. The solution does not precipitate alkali during precipitation. It forms white-colored, volume-swelling Bismuth Oxide Hydrate Bi(OH).3. To make yellow, heat the solution and stir it briefly. Bismuth trioxide . You can get the final bismuth oxide product by washing it with water, filtering it, drying and then cleaning.
2. Mix them in a nitrogen atmosphere by adding dropwise 1.5 mol/L sodium hydroxylide aqueous solutions without carbon dioxide and 0.1 mol/L bismuth-nitrate solutions to 1 mol/L NaOH (at 80-90deg C.). After precipitation, the solution will remain alkaline. After mixing the hot solution, a volume-expanded, white bismuth oxidehydrate Bi(OH),3 precipitates. It is then dehydrated, and it turns into yellow bismuth trioxide. Decant and rinse 15 times using water only, without oxygen and carbon dioxide. Finally, filter the solution and dry.
3. Once the bismuth has been melted in the graphitecrucible, the oxygen flow creates an arc between the graphite and metal surfaces to heat up and oxidize. You should place the crucible in a large container. The oxygen must also be supplied continuously to maintain a sufficient supply. Rapidly, b-bismuth-trioxide is formed at a temperature of 750 to 800°C. The product can then be quenched with water or placed on a plate made of cold metals to produce a high temperature phase b-type.
4. Slowly stir the excess sodium carbate solution with 20g Bi(NO3)3*5H2O acids solution. Take the Bi2O3CO3 precipitate, filter it, wash, dry, and then rinse. It can be placed in an aluminum vessel and heated at 650K for 1.5 hours.
5. For approximately (34h), heat the bismuth nitrate to 400500.
Once the fire is out, it cools down and all turns into lemony yellow.
Bismuth Oxide applications
This is used for the preparation of bismuth sodium; it can also be used as an electronic ceramic material, electrolyte, photoelectric material and high-temperature superconducting materials catalyst. To be used as an additive in electronic ceramic materials, bismuth dioxide must have a purity of at least 99.15%. There are three main uses for bismuth oxide: ceramic capacitors and zinc oxide varistors; glaze rubber compounding, medicine, red glass compounding agents and glaze rubber compounding.
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