Time：2023.11.06Browse：1
The flotation method is one of the conventional mineral purification methods that consumes less energy and reagents, and has a lower cost. This is a major advantage of the flotation method for purifying graphite. However, using flotation to purify graphite can only achieve a limited increase in its grade. For flake graphite, using multi-stage grinding not only cannot completely dissociate its monomer, but also is not conducive to protecting the large scale of graphite. Therefore, using flotation to further improve graphite grade is neither economical nor scientific. To obtain high carbon graphite with a carbon content of over 99%, chemical methods must be used to purify the graphite.
（1） Chlorination roasting method. The low roasting temperature and low chlorine consumption of the chlorination roasting method significantly reduce the production cost of graphite. At the same time, the carbon content of graphite products is equivalent to that after treatment with hydrofluoric acid, and the recovery rate of the chlorination roasting method is higher. However, due to the toxicity and strong corrosiveness of chlorine gas, which requires strict sealing for equipment operation and proper treatment of exhaust gas, its promotion and application are to some extent limited.
（2） Alkali acid purification method. The carbon content of graphite purified by alkaline acid method can reach over 99%, which has the characteristics of low one-time investment, high product grade, and strong process adaptability. And it also has conventional equipment and strong universality (besides graphite, many
The purification of non-metallic minerals can be achieved through the alkali acid method, which is currently a widely used method in China; Its disadvantages include high energy consumption, long reaction time, large graphite loss, and severe wastewater pollution.
（3） Hydrofluoric acid method. The main advantages of hydrofluoric acid method are high impurity removal efficiency, high grade of the obtained product, small impact on the performance of graphite products, and low energy consumption. The disadvantage is that hydrofluoric acid is highly toxic and corrosive, and strict safety measures must be taken during the production process. The strict requirements for equipment also lead to an increase in cost. In addition, the wastewater generated by the hydrofluoric acid method is highly toxic and corrosive, requiring strict treatment before discharge. The environmental protection investment also greatly discounts the low cost advantage of the hydrofluoric acid method.
（4） The major advantage of high-temperature method is that the carbon content of the product is extremely high, reaching over 99.995%. The disadvantage is that it requires specialized design and construction of high-temperature furnaces, which are expensive in equipment and require a large one-time investment. In addition, high energy consumption and high electricity bills increase production costs. Moreover, the harsh production conditions also limit the application range of this method. Only in situations where national defense, aerospace, and other industries have special requirements for the purity of graphite products, this method is considered for small-scale production of graphite, which cannot be promoted in industry. Comparative analysis shows that several methods for graphite purification each have their own advantages and disadvantages. The alkali acid method is easy to operate, has low production costs, and has low requirements for production conditions. However, the fixed carbon content of the produced graphite is relatively low, and currently it cannot reach 99.9%. The hydrofluoric acid method has good impurity removal effect and high fixed carbon content in the product. However, hydrofluoric acid is highly toxic and corrosive, requiring strict safety protection measures and production conditions, and wastewater is not easy to treat. The chlorination roasting method also requires strict sealing due to the toxicity and strong corrosiveness of chlorine gas. The high-temperature method can produce very high grade high-purity graphite, but due to its own limitations, it cannot be promoted and is only applied in a small range.
2023-12-12Raw material cost: The price of graphite molds is influenced by the cost of raw materials. The main raw material for graphite molds is graphite material, and its price fluctuations will directly affect the price of graphite molds. The rise or fall in raw material prices can lead to fluctuations in graphite mold prices.
(1) Select the appropriate electrode variety and diameter based on the capacity of the electric furnace and the equipped transformer capacity.(2) During the loading, unloading, and storage of graphite electrodes, attention should be paid to preventing damage and moisture. The electrodes that are affected by moisture should be dried by the electric furnace before use. When lifting, the joint holes and surface threads of the electrodes should be protected.(3) When connecting the electrode, compressed air should be used to blow off the dust in the connector hole. The force used to screw the connector into the electrode connector hole should be stable and uniform, and the tightening torque should comply with regulations. When holding the electrode, it is necessary to avoid the joint area, that is, clamp it above or below the bottom of the electrode joint hole.(4) When loading furnace materials into the electric furnace, in order to reduce the impact of furnace material collapse on the ele2023-08-29What precautions should be taken when using graphite electrodes in electric furnace steel mills?
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