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About JinhuiEstablished in 1999, the company is located in Pingdu City, Qingdao, Shandong Province, a prime production area for high-quality flake graphite in China.
Graphite Purification Methods (Part 2)
Release Date:
2020-04-06
(3) Hydrofluoric Acid Method
The main advantages of the hydrofluoric acid method are high impurity removal efficiency, high product grade, and little impact on graphite product performance, low energy consumption. The disadvantages are that hydrofluoric acid is highly toxic and strongly corrosive, requiring strict safety protection measures during the production process. Strict equipment requirements also lead to increased costs. In addition, the wastewater produced by the hydrofluoric acid method is highly toxic and corrosive, requiring strict treatment before discharge. Environmental investment also greatly reduces the advantage of the hydrofluoric acid method's low cost (cost-effectiveness).
(4) High-Temperature Method
The biggest advantage of the high-temperature method is the extremely high carbon content of the product, which can reach over 99.995%. The disadvantages are that high-temperature furnaces must be specially designed and built, the equipment is expensive, and the one-time investment is high. In addition, it consumes a lot of energy, and high electricity costs increase production costs. Moreover, the harsh production conditions severely limit the application scope of this method. It is only considered for small-batch production of graphite in fields such as national defense and aerospace, where there are special requirements for graphite product purity; it cannot yet be widely promoted in industry. (Industrial promotion is not yet feasible.)
Comparative analysis shows that, graphite Each of the several purification methods has its own advantages and disadvantages. The alkali-acid method is easy to operate, has low production costs, and requires less stringent production conditions, but the fixed carbon content of the produced graphite is low, currently unable to reach 99.9%; the hydrofluoric acid method has good impurity removal effects and high product fixed carbon content, but hydrofluoric acid is highly toxic and strongly corrosive, requiring strict safety protection measures and production conditions, and wastewater is difficult 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 inherent limitations, it cannot be widely promoted at present and is only applied in a small range.
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Address: Nantanpo Village, Zhangshe Town, Pingdu City, Qingdao, Shandong Province, China
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