The purification skills of carbon graphite mainly include the following methods:
Alkali acid purification method: This method has the characteristics of low one-time investment, high product grade, and strong process adaptability. Its disadvantages are high energy consumption, long reaction time, large graphite loss and serious wastewater pollution.
Hydrofluoric acid method: This method has high impurity removal efficiency, high product grade and low energy consumption, but it has strict requirements on equipment and high cost. In addition, hydrofluoric acid is highly toxic and corrosive, and strict safety protection measures are required.
Chlorination roasting method: This method has low roasting temperature, low chlorine consumption, low cost and high recovery rate. However, its disadvantage is that chlorine is toxic, has high requirements for equipment operation, and requires strict sealing and treatment of tail gas.
High temperature method: The product of this method has extremely high carbon content, which can reach more than 99.995%, but the equipment is expensive, the investment is large, and the energy consumption is high. It is suitable for small batch production in special occasions such as national defense and aerospace.
Flotation method: Flotation is a basic technology that uses the floating characteristics of graphite to separate graphite from other minerals through multiple stages of grinding and sorting processes. The advantages of flotation are simple equipment, low energy consumption, low production cost, and can significantly improve the purity and quality of graphite.
Each of these methods has its own advantages and disadvantages, and choosing the right method needs to be considered based on specific needs and costs.
