Background and Overview
Bismuth oxide produces three variants due to firing at different temperatures. α-body: heavy yellow powder or monoclinic crystal, melting point 820°C, relative density 8.9, refractive index 1.91. It transforms into γ-body at 860°C. β-body: gray-black cubic crystal, relative density 8.20, it will transform into α-body at 704℃. γ-body: heavy light lemon yellow powder, belonging to tetragonal crystal system, melting point 860°C, relative density 8.55, turns yellowish brown when melted, remains yellow when cooled, melts under intense red heat, condenses into crystals after cooling lumps. All three are insoluble in water, but soluble in ethanol and strong acid. Preparation method: burn bismuth carbonate or basic bismuth nitrate until constant weight, keep the temperature at 704°C to obtain α, β-form, and keep the temperature above 820°C to obtain γ-form. Its use: as a high-purity analytical reagent, used in inorganic synthesis, red glass ingredients, pottery pigments, medicine and fireproof paper, etc.
Preparation[2]
A method for producing high-purity
bismuth oxide from bismuth-containing materials. First, the bismuth-containing materials are leached with hydrochloric acid solution, so that bismuth in the bismuth-containing materials enters the solution in the form of bismuth chloride, and the leaching solution and leaching residue are separated. Then, add pure water to the leaching solution, bismuth oxychloride undergoes a hydrolysis reaction to precipitate bismuth oxychloride; then, separate the precipitated bismuth oxychloride, and add dilute alkali solution, bismuth oxychloride is converted into hydrogen under the condition of low temperature dilute alkali Bismuth oxide; then add a concentrated alkali solution to the filtered bismuth hydroxide, and convert it into bismuth oxide through high-temperature concentrated alkali; finally, the generated bismuth oxide can be washed, dried, and sieved to obtain the high-purity bismuth oxide . The invention uses bismuth-containing materials as raw materials, makes bismuth enter the solution in the form of bismuth chloride, and then hydrolyzes the bismuth into bismuth oxychloride, and undergoes low-temperature dilute alkali conversion and high-temperature concentrated alkali conversion to generate bismuth oxide. The method has simple flow, less consumption of reagents, and can deeply purify and separate impurities such as Fe, Pb, Sb, As and the like.
application[3][4][5]
CN201110064626.5 discloses a method for purifying and separating chloride ions in chlorine-containing zinc sulfate solution during zinc electrolysis, which belongs to hydrometallurgical technology. This method is to place bismuth oxide in a 40-80g/L dilute sulfuric acid solution, convert it into a precipitate of bismuth subsulphate monohydrate, separate the dilute sulfuric acid solution and bismuth subsulphate monohydrate; Bismuth subsulphate subsulphate is placed in the chlorine-containing zinc sulfate solution, stirred and dissolved, and Bi3+ is recomplexed with Cl- in the solution to form bismuth oxychloride precipitation; the separated bismuth oxychloride is at a concentration of 35 ~ 50% with the participation of bismuth oxide seeds In the 70g/L alkali solution, it is converted into
bismuth oxide crystal precipitation, and the Cl element is free in the solution in an ionic state; the bismuth oxide and chloride solution are separated, the bismuth oxide is recycled, and when the chloride solution is circulated to the set concentration, it evaporates Crystallizes as solid chloride. The invention has low operating cost, high efficiency and small loss of bismuth.
CN200510009684.2 discloses a bismuth oxide-coated ceramic phase-reinforced aluminum matrix composite material, which relates to a new type of composite material. The aluminum-based composite material of the present invention is composed of bismuth oxide, a ceramic phase reinforcement and an aluminum matrix, wherein the volume fraction of the ceramic phase reinforcement accounts for 5% to 50% of the total volume fraction, and the added amount of bismuth oxide accounts for 5% of the ceramic phase reinforcement. 2~20% of body weight. The cladding bismuth oxide is basically at the interface between the reinforcement and the matrix, and bismuth oxide and the matrix aluminum undergo a thermite reaction to generate low melting point metal bismuth, which is distributed at the interface between the reinforcement and the matrix. When the composite material is thermally deformed, the temperature is 270°C higher than the melting point of metal bismuth, and the low melting point metal bismuth at the interface melts and becomes liquid, which acts as a lubricant between the reinforcement and the matrix, reducing the deformation temperature and processing costs, reducing The damage of the ceramic phase reinforcement is eliminated, and the deformed composite still has excellent mechanical properties.
CN201810662665.7 discloses a method for catalytically removing antibiotics by using carbon nitride/nitrogen doped hollow mesoporous carbon/bismuth oxide ternary Z-type photocatalyst. The method uses carbon nitride/nitrogen doped hollow mesoporous carbon/bismuth oxide three The Z-type photocatalyst is used to treat antibiotics, and the carbon nitride/nitrogen-doped hollow mesoporous carbon/bismuth oxide ternary Z-type photocatalyst is based on graphite phase carbon nitride, and its surface is modified with nitrogen-doped hollow mesoporous carbon and bismuth oxide. The method of the present invention can effectively remove different types of antibiotics by using carbon nitride/nitrogen-doped hollow mesoporous carbon/bismuth oxide ternary Z-type photocatalyst to photocatalytically degrade antibiotics, and has the advantages of high removal rate, fast removal, easy implementation, It has the advantages of high safety, low cost, and no secondary pollution. In particular, it can realize the efficient removal of antibiotics in water, and has a good practical application prospect.
