Manufacturing method of cerium oxide
I. Introduction
Cerium oxide is an important raw material for the production of chemicals, which is widely used in the fields of catalysts, polishing powders, ceramic pigments, glass decolorizers and so on. With the continuous progress of science and technology, the manufacturing method of cerium oxide has been continuously developed and optimized. In this paper, we will introduce the manufacturing methods of cerium oxide in detail, including chemical reaction method, physical method, biological method and so on.
II. Chemical reaction method
1. Nitric acid method
Nitric acid method is currently one of the main methods for the production of cerium oxide. This method takes nitric acid and cerium oxide as raw materials, and reacts under appropriate conditions to produce cerium nitrate solution, which is evaporated, crystallized, dried and other processes to obtain cerium oxide products. The advantages of the nitric acid method are simple process and high production efficiency, but the production process generates a large amount of waste gas and waste water, which causes pollution to the environment.
2. Oxalic acid method
Oxalic acid method is a more environmentally friendly method of manufacturing cerium oxide. The method takes oxalic acid and cerium oxide as raw materials, and reacts under appropriate conditions to produce cerium oxalate precipitate, which is filtered, washed, dried and other processes to obtain cerium oxide products. The advantages of oxalic acid method are high product purity and low environmental pollution, but the production cost is higher.
III. Physical method
1. Mechanical grinding method
Mechanical grinding method is a method of preparing cerium oxide through physical action. This method puts cerium oxide raw materials into a ball mill, adds appropriate ball milling media and water, and generates friction and impact through the rotation of the ball mill, so that the cerium oxide raw materials reach the nanometer level. The advantages of mechanical grinding method are simple process and low cost, but the product particle size distribution is wide.
2. Laser method
Laser method is a new type of cerium oxide manufacturing method. This method uses a laser beam to irradiate on the surface of the raw material of cerium oxide, so that it rapidly melts and solidifies, thus obtaining nano-scale cerium oxide powder. The advantages of the laser method are high product purity, narrow particle size distribution, but the equipment cost is higher.
Four, biological method
Biological method is a method of using microorganisms or plants to extract cerium oxide. The method uses certain microorganisms or plants to adsorb cerium oxide, cerium oxide is extracted from the solution. The advantages of the biological method are environmental protection and low cost, but the extraction efficiency is low and needs further optimization.
V. Conclusion
There are various methods for manufacturing cerium oxide, including chemical reaction method, physical method and biological method. Different methods have their own advantages and disadvantages, and suitable methods should be selected according to specific needs and conditions. Meanwhile, with the increasing awareness of environmental protection and the continuous progress of technology, it has become an inevitable trend to develop more environmentally friendly, efficient and low-cost cerium oxide manufacturing methods.
