Flake graphite is a natural graphite that is generally purified by various physical and chemical methods to increase its carbon content and improve its application value. Here are several methods of purification of flake graphite:
Froth flotation: Froth flotation is a commonly used method for purifying flake graphite. It uses surface properties of minerals to separate and purify minerals. The process involves crushing the raw ore to a certain size, adding water and reagents to the slurry, stirring to make the minerals selectively adhere to the bubbles, and floating to the surface for collection.
Acid leaching: Acid leaching is used to remove impurities from flake graphite. The process involves using acid to dissolve and remove impurities such as metal oxides and hydroxides, and then washing and drying the purified graphite.
Alkali roasting: Alkali roasting is a process in which flake graphite is heated with an alkali metal hydroxide (such as potassium hydroxide) at high temperatures. This process can remove impurities and increase the carbon content of flake graphite.
High-temperature purification: High-temperature purification involves heating flake graphite to high temperatures in an inert gas or vacuum environment. This process can remove impurities and increase the carbon content of flake graphite.
Microwave purification: Microwave purification is a relatively new technology for purifying flake graphite. The process involves heating flake graphite with microwaves to remove impurities and increase the carbon content.
Overall, the choice of purification method for flake graphite depends on the specific impurities present and the desired level of purity.
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