Bismuth Oxide Production via Low-Temperature Oxidation
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Solution Overview
Problem
Existing methods for preparing bismuth oxide require high energy costs, complex and costly processes, and result in environmental pollution, failing to produce high-purity bismuth oxide efficiently.
Innovation Solution
A method involving melting bismuth metal at a low temperature (300-450°C), oxidizing it in an open reactor, and further oxidizing the product in a closed reactor at 300-600°C, using an apparatus with a melting tank, open and closed reactors, and a collecting device with an exhaust fan to achieve high-purity α-bismuth oxide production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature oxidation method is used to prepare bismuth oxide, then the oxidation reaction is efficient, but energy consumption is high and production cost increases
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature (750-900°C) to low temperature (300-650°C) oxidation process. This parameter change enables efficient oxidation while significantly reducing energy consumption, resolving the contradiction between productivity and energy usage.
Solution Approach 2:
The patent uses oxygen gas as a strong oxidant to accelerate the oxidation reaction at low temperatures. By introducing pure oxygen instead of relying on atmospheric oxygen, the oxidation efficiency is maintained at high levels even at reduced temperatures, solving the contradiction between reaction efficiency and energy consumption.
2Quantity of substance
If wet process using bismuth nitrate is used to prepare bismuth oxide, then bismuth oxide can be obtained, but the process is complicated and production cost is high
Solution Approach 1:
The patent extracts and eliminates the complex wet process steps (nitrate preparation, filtration, washing, drying) by directly using bismuth metal oxidation. This extraction of unnecessary process steps simplifies the overall process while maintaining bismuth oxide production capability.
Solution Approach 2:
The patent segments the process into two simple stages: melting bismuth metal and oxidizing it with oxygen gas. This segmentation eliminates the need for complex multi-step wet chemical processing, reducing both device complexity and production cost while maintaining effective bismuth oxide production.
3Quantity of substance
If wet process is used to prepare bismuth oxide, then bismuth oxide can be obtained, but environmental pollution occurs and water treatment cost is high
Solution Approach 1:
The patent converts the potentially harmful wet chemical process into a beneficial dry oxidation process. By using oxygen gas oxidation of molten bismuth, the process eliminates wastewater generation and chemical waste, transforming a polluting process into an environmentally benign one while maintaining bismuth oxide production.
4Quantity of substance
If high temperature vaporization method is used to prepare bismuth oxide, then bismuth oxide can be obtained, but energy consumption is high and processing time is long
Solution Approach 1:
The patent changes the fundamental process parameters from high temperature vaporization to low temperature oxidation of molten metal. This parameter change reduces energy consumption significantly while shortening processing time, as the oxidation reaction occurs rapidly at lower temperatures compared to prolonged high temperature vaporization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the economical production of high-purity α-bismuth oxide with simple operation, high efficiency, and easy maintenance, reducing energy consumption and environmental impact while achieving high production rates.
Implementation Method 1
melting bismuth metal at a low temperature
Implementation Method 2
oxidizing the obtained product in a closed reactor by supplying oxygen
Data Source
AI summary
A method of preparing bismuth oxide and an apparatus therefor are disclosed. The method includes: melting bismuth metal; transporting the melted bismuth metal to an open first reactor and oxidizing the melted bismuth metal while stirring at a temperature of 300-650° C.; and transporting bismuth oxide and un-reacted material to a closed second reactor through a screw and oxidizing the bismuth oxide and un-reacted material while rotating the closed second reactor at a temperature of 300-600° C. with a supply of air or oxygen.