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[Chemical Knowledge]：Production method and process of cerium oxide

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The manufacturing method
of cerium oxide
1. Introduction

cerium oxide is an important chemical production raw material, widely used in catalysts, polishing powder, ceramic pigments, glass decolorant and other fields. With the continuous progress of science and technology, the manufacturing method of cerium oxide has been continuously developed and optimized. This paper will introduce the manufacturing methods of cerium oxide in detail, including chemical reaction method, physical method, biological method and so on.

2. Chemical reaction method

1. Nitric acid method
Nitric acid method is one of the main methods of producing cerium oxide at present. The method uses nitric acid and cerium oxide as raw materials, reacts under appropriate conditions to generate a cerium nitrate solution, and after evaporation, crystallization, drying and other processes, the cerium oxide product is obtained. The advantages of nitric acid method are simple process and high production efficiency, but a large amount of waste gas and waste water are produced in the production process, which causes pollution to the environment.

2. Oxalic acid method
The oxalic acid method is a more environmentally friendly method for the manufacture of cerium oxide. The method uses oxalic acid and cerium oxide as raw materials, reacts under appropriate conditions, generates cerium oxalate precipitate, and obtains cerium oxide products through filtering, washing, drying and other processes. The advantages of the oxalic acid method are high product purity and low environmental pollution, but the production cost is high.

3. physical method

1. Mechanical grinding method
The mechanical grinding method is a method for preparing cerium oxide through physical action. The method puts the cerium oxide raw material into the ball mill, adds appropriate ball mill media and water, and generates friction and impact force through the rotation of the ball mill, so that the cerium oxide raw material reaches the nanometer level. The mechanical grinding method has the advantages of simple process and low cost, but the product has a wide particle size distribution.

2. Laser method
The laser method is a new type of cerium oxide manufacturing method. The method uses a laser beam to irradiate the surface of the cerium oxide raw material to rapidly melt and solidify it, thereby obtaining a nanoscale cerium oxide powder. The advantages of the laser method are high product purity and narrow particle size distribution, but the equipment cost is high.

4. biological method

biological method is a method of extracting cerium oxide using microorganisms or plants. This method uses the adsorption of cerium oxide by certain microorganisms or plants to extract cerium oxide from the solution. The advantages of biological method are environmental protection and low cost, but the extraction efficiency is low, which needs further optimization.

5. conclusion

cerium oxide manufacturing methods are varied, including chemical reaction method, physical method and biological method. Different methods have their own advantages and disadvantages, should be based on specific needs and conditions to choose the appropriate method. At the same time, with the continuous improvement of environmental awareness and technological progress, the development of more environmentally friendly, efficient, low-cost cerium oxide manufacturing methods has become an inevitable trend.

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