Bismuth trioxide (Bi2O3)
Bismuth oxide has three main applications in catalysts: one is molybdenum bismuth catalyst, such as bismuth molybdenum titanium mixed oxide prepared by sol-gel method, with a specific surface area of 32 to 67m2. Π g. It is an effective and economical catalytic material for oxidation reaction. In industrial application, it can be used as a catalyst for the oxidation of propylene to acrolein, the preparation of acrylonitrile from propylene, the oxidative dehydrogenation of butene to butadiene, and the oxidation of butadiene to furan.
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Bismuth trioxide and other bismuth products are widely used in chemical catalysis, flame retardant, functional ceramics, pharmaceutical synthesis, energy materials and other fields. Except that spherical bismuth oxide is prepared by metal bismuth high temperature oxidation method, most bismuth oxide, bismuth nitrite, bismuth hypocarbonate and other bismuth products go through the bismuth nitrate stage, that is, bismuth nitrate is prepared from refined bismuth first, and bismuth oxide and other bismuth products are prepared from bismuth nitrate. This traditional method has the problems of high energy consumption, high equipment requirements, NxOy pollution, long process flow, large amount of wastewater and so on. In view of these problems, a new process for preparing ordinary grade bismuth oxide by low-temperature oxidation of bismuth powder, and then preparing bismuth chemical products such as bismuth nitrate from ordinary grade bismuth oxide, as well as various fine products such as bismuth oxide ultrafine powder, bismuth oxide whisker and nanowire is proposed for the first time. The process not only avoids the pollution of NxOy gas and wastewater existing in traditional methods, but also has low energy consumption and friendly environment. It is of great significance to promote the scientific and technological progress of bismuth industry and improve the industrial competitiveness of bismuth.
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The sensitivity of the sensor made of high-purity bismuth oxide doped tin dioxide is 10 times higher than that of the existing products in the market; Replacing lead oxide to produce non-toxic fireworks has been successfully applied at present; Production of flame retardant additives in place of antimony oxide.
Bismuth oxide is mainly used in chemical industry (such as chemical reagent, bismuth salt manufacturing, etc.), glass industry (mainly used for coloring), electronic industry (electronic ceramics, etc.) and other industries (such as fire-proof paper manufacturing, nuclear reactor fuel, etc.). Among them, the electronic industry is the most widely used industry of bismuth oxide, which is mainly used in the fields of varistors, thermistors, zinc oxide arresters and picture tubes. In terms of materials, bismuth oxide is mainly used in electronic ceramic powder materials, electrolyte materials, photoelectric materials, high temperature superconducting materials, catalysts, etc. Electronic ceramic powder materials the field of electronic ceramics is a mature and dynamic field of bismuth oxide application. Bismuth oxide is an important additive in electronic ceramic powder materials, and its purity is generally required to be more than 99.5%. The main application objects are zinc oxide varistors, ceramic capacitors and ferrite magnetic materials.
In the development of electronic ceramics, the United States is in the forefront of the world. While Japan has occupied 60% of the world ceramic market by large-scale production and advanced technology. With the research and development of nano bismuth oxide and the innovation and improvement of homogenization manufacturing technology, it will also greatly promote the improvement of the performance of electronic ceramic related components and the reduction of production costs. Bismuth oxide mainly acts as an effect forming agent in zinc oxide varistors and is the main contributor to the high non-linear volt ampere characteristics of zinc oxide varistors.