Flake graphite is widely used in industry, but the demand for flake graphite is different in different industries, so flake graphite needs different purification methods. The following Furuite graphite editor will explain what purification methods flake graphite has:
1. Hydrofluoric acid method.
The main advantages of hydrofluoric acid method are high impurity removal efficiency, high grade of products, little influence on the performance of graphite products and low energy consumption. The disadvantage is that hydrofluoric acid is highly toxic and corrosive, and strict safety protection measures must be taken in the production process.The strict requirements for equipment also lead to the increase of cost. In addition, the wastewater produced by hydrofluoric acid method is very toxic and corrosive, and it needs strict treatment before it can be discharged. The investment in environmental protection also greatly reduces the advantages of low cost of hydrofluoric acid method.
2, the basic acid purification method.
The carbon content of graphite purified by alkaline acid method can reach more than 99%, which has the characteristics of low one-time investment, high product grade and strong process adaptability. Moreover, it has the advantages of routine equipment and strong versatility. The basic acid method is the most widely used method in China. Its disadvantages are large energy consumption, long reaction time, large graphite loss and serious wastewater pollution.
3. Chlorination roasting method.
The low roasting temperature and small chlorine consumption of chlorination roasting method greatly reduce the production cost of graphite. At the same time, the carbon content of graphite products is equivalent to that of hydrofluoric acid treatment, and the recovery rate of chlorination roasting method is higher. However, because chlorine is toxic and corrosive, it requires high equipment operation and needs strict sealing, and the tail gas must be properly treated, so To some extent, it limits its popularization and application.
4. High temperature method.
The biggest advantage of the high-temperature method is that the carbon content of the product is extremely high, which can reach above 99.995%. The disadvantage is that the high-temperature furnace must be specially designed and built, the equipment is expensive, and there are many secondary investments. In addition, the energy consumption is high, and the high electricity bill increases the production cost. Moreover, the harsh production conditions also make the application scope of this method extremely limited. Only in national defense, aerospace and other occasions with special requirements on the purity of graphite products, this method is considered for small batch production of graphite, and it cannot be popularized in industry.
Post time: Jan-30-2023