Flake graphite crystals exhibit a typical flake-like structure and are formed through high-pressure metamorphism of natural graphite. They are available in both large-flake and fine-flake grades. The flake crystals are intact, with thin layers and excellent toughness. Its floatability, lubricity, and plasticity are superior to those of other graphite types. It also possesses excellent thermal shock resistance, electrical and thermal conductivity, and resistance to acids, alkalis, and corrosion. Under oxygen-free conditions, it can withstand high temperatures (with a melting point exceeding 3,000°C) and exhibits strong chemical stability.
Flake graphite is a primary category of natural graphite. It is produced from natural graphite ore through processes such as crushing, grinding, and flotation to separate and purify the material, fully preserving the core characteristics of the natural flake structure. It offers balanced performance and broad applicability. It can be classified into high-carbon, medium-carbon, and low-carbon grades based on fixed carbon content. It can be used directly in various industrial sectors and serves as the core raw material for producing value-added products such as high-purity graphite, spherical graphite, and micro-powder graphite. It is the most fundamental and widely used category in the graphite industry.
The core characteristics of flake graphite include an intact flake structure, high toughness, outstanding lubricity and plasticity, excellent electrical and thermal conductivity, high-temperature and corrosion resistance, moderate cost, and ease of processing. It can be further processed and modified according to specific requirements. Its applications span multiple industries, including machinery, metallurgy, chemicals, military, light industry, national defense, electronics, batteries, education, and refractory materials. Specific uses include advanced refractory materials and coatings in the metallurgical industry; stabilizers for pyrotechnic materials in the military industry; pencil leads in the light industry; carbon brushes in the electrical industry; electrodes in the battery industry; and catalyst additives in the fertilizer industry; After further processing, it can be used to produce high-tech products such as graphite emulsion, graphite sealing materials and composites, graphite products, and graphite anti-friction additives, making it an important non-metallic mineral raw material for various industrial sectors.
Flake graphite is produced from natural graphite ore. The core processing workflow includes crushing, grinding, flotation, dewatering, and drying. Impurities are removed from the raw material through physical separation methods, preserving the intact flake structure and increasing the fixed carbon content, ultimately yielding flake graphite products of various specifications and purities. Depending on downstream application requirements, further purification, modification, or deep processing can be performed to produce various graphite derivatives.
| Standard component content | ||||||
|---|---|---|---|---|---|---|
| NO. | Model | ash% | volatile% | Moisture% | Mesh size% | Remarks |
| 1 | -193 | ≤5.8 | ≤1.2 | ≤0.5 | -100mesh>80 | All ingredient contents can be customized according to customerrequirements |
| 2 | -194 | ≤4.8 | ≤1.2 | ≤0.5 | -100mesh>80 | |
| 3 | -195 | ≤3.8 | ≤1.2 | ≤0.5 | -100mesh>80 | |
| 4 | -199 | ≤0.7 | ≤0.3 | ≤0.5 | -100mesh>80 | |
| 5 | -199.9 | ≤0.1 | ≤0.3 | -100mesh>80 | ||
| 6 | 595 | ≤3.8 | ≤0.5 | 50mesh>80 | ||
| 7 | 599 | ≤0.7 | ≤0.5 | 50mesh>80 | ||
| 8 | 599.9 | ≤0.1 | ≤0.3 | 50mesh>80 | ||
| 9 | 895 | ≤3.8 | ≤0.5 | 80mesh>80 | ||
| 10 | 899 | ≤0.7 | ≤0.5 | 80mesh>80 | ||
| 11 | 195 | ≤3.8 | ≤0.5 | 100mesh>80 | ||
| 12 | 199 | ≤0.7 | ≤0.5 | 100mesh>80 | ||
There is a key issue with the use of flake graphite in refractory materials: poor wettability.
Specifically:
Flake graphite has low surface tension, and its surface contains approximately 0.45% volatile organic compounds.
The graphite surface is highly hydrophobic, resulting in poor wettability with the silicate liquid phase.
It tends to agglomerate in castables, making it difficult to disperse uniformly, which affects the material’s density.
It should be stored in a dry, well-ventilated environment to prevent caking caused by moisture. Avoid direct sunlight and high temperatures. Packaging must be tightly sealed to prevent moisture absorption and deterioration.
Expandable graphite is a graphite intercalation compound. It is produced by using natural flake graphite as raw material and introducing acids (such as sulfuric acid) and oxidizing agents into the graphite layers through chemical or electrochemical methods.
Graphite consists of countless layers of graphene stacked on top of one another, while graphene is a single layer of graphite. You can think of it this way: if you repeatedly wrap graphite with adhesive tape and peel it off, you may eventually obtain a single layer of graphene—which is, in fact, how it was originally discovered.
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